1
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Shu P, Gong X, Du Y, Han Y, Jin S, Wang Z, Qian P, Li X. Effects of Simulated Acid Rain on Photosynthesis in Pinus massoniana and Cunninghamia lanceolata in Terms of Prompt Fluorescence, Delayed Fluorescence, and Modulated Reflection at 820 nm. Plants (Basel) 2024; 13:622. [PMID: 38475467 DOI: 10.3390/plants13050622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024]
Abstract
The effects of simulated acid rain (SAR) on the photosynthetic performance of subtropical coniferous species have not been thoroughly investigated. In this study, we treated two coniferous species, Pinus massoniana (PM) and Cunninghamia lanceolata (CL), with four gradients of SAR and then analyzed their photosynthetic activities through measurements of gas exchange, prompt fluorescence (PF), delayed fluorescence (DF), and modulated reflection at 820 nm (MR820). Gas exchange analysis indicated that the decrease in the net photosynthetic rate (Pn) in PM and CL was unrelated to stomatal factors. For the PF transients, SAR induced positive K-band and L-band, a significant reduction in photosynthetic performance index (PIABS), the quantum yield of electron transfer per unit cross-section (ETO/CSm), and maximal photochemical efficiency of photosystem II (Fv/Fm). Analysis of the MR820 kinetics showed that the re-reduction kinetics of PSI reaction center (P700+) and plastocyanin (PC+) became slower and occurred at later times under SAR treatment. For the DF signals, a decrease in the amplitude of the DF induction curve reduced the maximum value of DF (I1). These results suggested that SAR obstructed photosystem II (PSII) donor-side and acceptor-side electron transfer capacity, impaired the connectivity between PSII and PSI, and destroyed the oxygen-evolving complex (OEC). However, PM was better able to withstand SAR stress than CL, likely because of the activation of a protective mechanism.
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Affiliation(s)
- Pengzhou Shu
- Jiyang College, Zhejiang A&F University, Zhuji 311800, China
| | - Xiaofei Gong
- Ecological Forestry Development Center of Suichang County, Lishui 323300, China
| | - Yanlei Du
- Environmental Protection Monitoring Station of Changxing County, Huzhou 313000, China
| | - Yini Han
- Jiyang College, Zhejiang A&F University, Zhuji 311800, China
| | - Songheng Jin
- Jiyang College, Zhejiang A&F University, Zhuji 311800, China
| | - Zhongxu Wang
- Jiyang College, Zhejiang A&F University, Zhuji 311800, China
| | - Penghong Qian
- Jiyang College, Zhejiang A&F University, Zhuji 311800, China
| | - Xueqin Li
- Jiyang College, Zhejiang A&F University, Zhuji 311800, China
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2
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Takeuchi A, Ikushima Y, Katsumata M, Sato Y, Hakamata T. Quantitative prediction of the growth inhibition of various harmful chemicals by statistical analysis of delayed fluorescence decay curves obtained from the green alga Raphidocelis subcapitata. Ecotoxicology 2023; 32:1174-1186. [PMID: 37971643 DOI: 10.1007/s10646-023-02711-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/22/2023] [Indexed: 11/19/2023]
Abstract
The toxicity of chemical substances to algal growth is generally measured by the 72-96 h algal growth inhibition test. We have developed a method to assess the toxicity of chemicals in aquatic environments more quickly and simply than conventional testing methods by delayed fluorescence (DF), which reflects the photosynthetic capacity of algae. The DF method is based on a technique for evaluating the amount of change in the decay curve due to the effects of chemicals ([Formula: see text], DF inhibition). Various studies on DF have been reported; however, few reports have evaluated the decay curve of DF by approach using inductive modeling based on measurement data such as principal component analysis (PCA) and partial least squares regression analysis (PLS). Therefore, the purpose of this study is to examine methods for estimating the magnitude and type of toxicity of chemicals by means of a principal component model (PC model) and multiple regression model (MR model) derived from changes in the decay curves of DF of algae exposed to a wide range of 37 toxic substances that have an effect of clear magnitude on algal growth. The changes in the DF decay curves due to exposure the 37 toxic substances to algae were summarized in the PC model composed of eigenvectors and scores of four principal components. For validation of usefulness, a hierarchical cluster analysis (HCA) of the amount of change in four PC scores revealed that the growth inhibition rate was more influential than the chemical type. We also found the possibility of quantitatively predicting the growth inhibition of chemicals by MR model by the amount of change in the PC scores.
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Affiliation(s)
- Ayano Takeuchi
- Central Research Laboratory, Hamamatsu Photonics K.K, Shizuoka, Japan.
| | - Yuko Ikushima
- Central Research Laboratory, Hamamatsu Photonics K.K, Shizuoka, Japan
| | | | - Yukiko Sato
- Central Research Laboratory, Hamamatsu Photonics K.K, Shizuoka, Japan
| | - Tomoyuki Hakamata
- Central Research Laboratory, Hamamatsu Photonics K.K, Shizuoka, Japan
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3
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Ran Z, Liu J, Zhuang J, Liu Y, Hu C. Multicolor Afterglow from Carbon Dots: Preparation and Mechanism. Small Methods 2023:e2301013. [PMID: 37891712 DOI: 10.1002/smtd.202301013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/26/2023] [Indexed: 10/29/2023]
Abstract
Carbon dots (CDs), as emerging long afterglow luminescent material, have attracted the attention of researchers and become one of the hot topics in long afterglow materials. In recent years, researchers have obtained a series of CDs-based long afterglow materials with different properties utilizing matrix-assisted and self-protective methods. To meet diverse application needs, the development of multicolor CDs-based long afterglow materials is a focus and challenge in this field. Most of the previously reported CDs-based long afterglow materials generally emit blue or green afterglow. Recently, some multicolor systems have been discovered, and the emission range can extend from ultraviolet to near-infrared. However, there is a lack of systematic and in-depth analysis regarding the preparation strategy and luminescence mechanism of multicolor afterglow from CDs-based long afterglow materials. Based on this, this review summarizes the preparation strategies of multicolor afterglow from raw materials and reaction parameters. Then, the luminescence mechanisms of multicolor afterglow are analyzed from seven factors, including carbonization degree, surface state, aggregation degree, temperature dependence, excitation dependence, multi-emission center, and energy transfer. Moreover, the applications of multicolor afterglow from CDs-based long afterglow materials are introduced. Finally, the problems and challenges in this field are discussed, and the future development directions are analyzed.
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Affiliation(s)
- Zhun Ran
- Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, P. R. China
| | - Jinkun Liu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, P. R. China
| | - Jianle Zhuang
- Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, P. R. China
| | - Yingliang Liu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, P. R. China
| | - Chaofan Hu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, P. R. China
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4
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Fu Y, Ye Z, Liu D, Mu Y, Xiao J, Hu D, Ji S, Huo Y, Su SJ. Macrocyclic Engineering of Thermally Activated Delayed Fluorescent Emitters for High-Efficiency Organic Light-Emitting Diodes. Adv Mater 2023; 35:e2301929. [PMID: 37178057 DOI: 10.1002/adma.202301929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/29/2023] [Indexed: 05/15/2023]
Abstract
Several thermally activated delayed fluorescence (TADF) materials have been studied and developed to realize high-performance organic light-emitting diodes (OLEDs). However, TADF macrocycles have not been sufficiently investigated owing to the synthetic challenges, resulting in limited exploration of their luminescent properties and the corresponding highly efficient OLEDs. In this study, a series of TADF macrocycles is synthesized using a modularly tunable strategy by introducing xanthones as acceptors and phenylamine derivatives as donors. A detailed analysis of their photophysical properties combined with fragment molecules reveals characteristics of high-performance macrocycles. The results indicate that: a) the ideal structure decreases the energy loss, which in turn reduces the non-radiative transitions; b) reasonable building blocks increase the oscillator strength providing a higher radiation transition rate; c) the horizontal dipole orientation (Θ) of the extended macrocyclic emitters is increased. Owing to the high photoluminescence quantum yields of ≈100% and 92% and excellent Θ of 80 and 79% for macrocycles MC-X and MC-XT in 5 wt% doped films, the corresponding devices exhibit record-high external quantum efficiencies of 31.6% and 26.9%, respectively, in the field of TADF macrocycles.
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Affiliation(s)
- Yu Fu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Zecong Ye
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Denghui Liu
- State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Yingxiao Mu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Jingping Xiao
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Dehua Hu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Shaomin Ji
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Analytical & Testing Center, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Shi-Jian Su
- State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China
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5
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Danyliv I, Ivaniuk K, Danyliv Y, Helzhynskyy I, Andruleviciene V, Volyniuk D, Stakhira P, Baryshnikov GV, Grazulevicius JV. Derivatives of 2-Pyridone Exhibiting Hot-Exciton TADF for Sky-Blue and White OLEDs. ACS Appl Electron Mater 2023; 5:4174-4186. [PMID: 37637972 PMCID: PMC10449007 DOI: 10.1021/acsaelm.3c00443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 07/04/2023] [Indexed: 08/29/2023]
Abstract
Development of emissive materials for utilization in organic light-emitting diodes (OLEDs) remains a highly relevant research field. One of the most important aspects in the development of efficient emitters for OLEDs is the efficiency of triplet-to-singlet exciton conversion. There are many concepts proposed for the transformation of triplet excitons to singlet excitons, among which thermally activated delayed fluorescence (TADF) is the most efficient and widespread. One of the variations of the TADF concept is the hot exciton approach according to which the process of exciton relaxation into the lowest energy electronic state (internal conversion as usual) is slower than intersystem crossing between high-lying singlets and triplets. In this paper, we present the donor-acceptor materials based on 2-pyridone acceptor coupled to the different donor moieties through the phenyl linker demonstrating good performance as components of sky-blue, green-yellow, and white OLEDs. Despite relatively low photoluminescence quantum yields, the compound containing 9,9-dimethyl-9,10-dihydroacridine donor demonstrated very good efficiency in sky-blue OLED with the single emissive layer, which showed an external quantum efficiency (EQE) of 3.7%. It also forms a green-yellow-emitting exciplex with 4,4',4″-tris[phenyl(m-tolyl)amino]triphenylamine. The corresponding OLED showed an EQE of 6.9%. The white OLED combining both exciplex and single emitter layers demonstrated an EQE of 9.8% together with excellent current and power efficiencies of 16.1 cd A-1 and 6.9 lm W-1, respectively. Quantum-chemical calculations together with the analysis of photoluminescence decay curves confirm the ability of all of the studied compounds to exhibit TADF through the hot exciton pathway, but the limiting factor reducing the efficiency of OLEDs is the low photoluminescence quantum yields caused mainly by nonradiative intersystem crossing dominating over the radiative fluorescence pathway.
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Affiliation(s)
- Iryna Danyliv
- Lviv
Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
| | - Khrystyna Ivaniuk
- Lviv
Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
| | - Yan Danyliv
- Lviv
Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
| | - Igor Helzhynskyy
- Lviv
Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
| | - Viktorija Andruleviciene
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsauskas str. 59, Kaunas 51423, Lithuania
| | - Dmytro Volyniuk
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsauskas str. 59, Kaunas 51423, Lithuania
| | - Pavlo Stakhira
- Lviv
Polytechnic National University, Stepan Bandera 12, 79013 Lviv, Ukraine
| | - Glib V. Baryshnikov
- Laboratory
of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
- Department
of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031 Cherkasy, Ukraine
| | - Juozas V. Grazulevicius
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsauskas str. 59, Kaunas 51423, Lithuania
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6
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Luo H, Wan Q, Choi W, Tsutsui Y, Dmitrieva E, Du L, Phillips DL, Seki S, Liu J. Two-Step Synthesis of B 2 N 2 -Doped Polycyclic Aromatic Hydrocarbon Containing Pentagonal and Heptagonal Rings with Long-Lived Delayed Fluorescence. Small 2023; 19:e2301769. [PMID: 37093207 DOI: 10.1002/smll.202301769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/03/2023] [Indexed: 05/03/2023]
Abstract
Pentagon-heptagon embedded polycyclic aromatic hydrocarbons (PAHs) have aroused increasing attention in recent years due to their unique physicochemical properties. Here, for the first time, this report demonstrates a facile method for the synthesis of a novel B2 N2 -doped PAH (BN-2) containing two pairs of pentagonal and heptagonal rings in only two steps. In the solid state of BN-2, two different conformations, including saddle-shaped and up-down geometries, are observed. Through a combined spectroscopic and calculation study, the excited-state dynamics of BN-2 is well-investigated in this current work. The resultant pentagon-heptagon embedded B2 N2 -doped BN-2 displays both prompt fluorescence and long-lived delayed fluorescence components at room temperature, with the triplet excited-state lifetime in the microsecond time region (τ = 19 µs). The triplet-triplet annihilation is assigned as the mechanism for the observed long-lived delayed fluorescence. Computational analyses attributed this observation to the small energy separation between the singlet and triplet excited states, facilitating the intersystem crossing (ISC) process which is further validated by the ultrafast spectroscopic measurements.
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Affiliation(s)
- Huan Luo
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, China
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou, 515031, China
| | - Qingyun Wan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, China
| | - Wookjin Choi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yusuke Tsutsui
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Evgenia Dmitrieva
- Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, 01069, Dresden, Germany
| | - Lili Du
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, China
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, China
| | - David Lee Phillips
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, China
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Junzhi Liu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, China
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Wright IA, Etherington MK, Batsanov AS, Monkman AP, Bryce MR. Oxidation State Tuning of Room Temperature Phosphorescence and Delayed Fluorescence in Phenothiazine and Phenothiazine-5,5-dioxide Dimers. Chemistry 2023; 29:e202300428. [PMID: 36916635 PMCID: PMC10946842 DOI: 10.1002/chem.202300428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/10/2023] [Accepted: 03/13/2023] [Indexed: 03/16/2023]
Abstract
Heterocyclic dimers consisting of combinations of butterfly-shaped phenothiazine (PTZ) and its chemically oxidized form phenothiazine-5,5-dioxide (PTZ(SO2 )) have been synthesized. A twist is imposed across the dimers by ortho-substituents including methyl ethers, sulfides and sulfones. X-ray crystallography, cyclic voltammetry and optical spectroscopy, underpinned by computational studies, have been employed to study the interplay between the oxidation state, conformational restriction, and emission mechanisms including thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP). While the PTZ(SO2 ) dimers are simple fluorophores, the presence of PTZ induces triplet-mediated emission with a mixed PTZ-PTZ(SO2 ) dimer displaying concentration dependent hallmarks of both TADF and RTP.
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Affiliation(s)
- Iain A. Wright
- Department of ChemistryDurham UniversitySouth RoadDurhamDH1 3LEUK
- School of ChemistryUniversity of EdinburghDavid Brewster RoadEdinburghEH9 3FJUK
| | - Marc K. Etherington
- Department of PhysicsDurham UniversitySouth RoadDurhamDH1 3LEUK
- Department of Mathematics, Physics and Electrical EngineeringNorthumbria UniversityEllison PlaceNewcastle upon TyneNE1 8STUK
| | | | | | - Martin R. Bryce
- Department of ChemistryDurham UniversitySouth RoadDurhamDH1 3LEUK
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Abstract
Carbon dots (CDs) have gradually become a new generation of nano-luminescent materials, which have received extensive attention due to excellent optical properties, wide source of raw materials, low toxicity, and good biocompatibility. In recent years, there are many reports on the luminescent phenomenon of CDs, and great progress has been achieved. However,there are rarely systematic summaries on CDs with persistent luminescence. Here, a summary of the recent progress on persistent luminescent CDs, including luminous mechanism, synthetic strategies, property regulation, and potential applications, is given. First, a brief introduction is given to the development of CDs luminescent materials. Then, the luminous mechanism of afterglow CDs from room temperature phosphorescence (RTP), delayed fluorescence (DF), and long persistent luminescence (LPL) is discussed. Next, the constructed methods of luminescent CDs materials are summarized from two aspects, including matrix-free self-protected and matrix-protected CDs. Moreover, the regulation of afterglow properties from color, lifetime, and efficiency is presented. Afterwards, the potential applications of CDs, such as anti-counterfeiting, information encryption, sensing, bio-imaging, multicolor display, LED devices, etc., are reviewed. Finally, an outlook on the development of CDs materials and applications is proposed.
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Affiliation(s)
- Huixian Shi
- Shanxi Key Laboratory of Biomedical Metal Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
| | - Yang Wu
- Shanxi Key Laboratory of Biomedical Metal Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing, 211816, China
| | - Jiahui Xu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing, 211816, China
| | - Huifang Shi
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing, 211816, China
| | - Zhongfu An
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing, 211816, China
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Skhirtladze L, Bezvikonnyi O, Keruckienė R, Dvylys L, Mahmoudi M, Labanauskas L, Ariffin A, Grazulevicius JV. Derivatives of Pyridazine with Phenoxazine and 9,9-Dimethyl-9,10-dihydroacridine Donor Moieties Exhibiting Thermally Activated Delayed Fluorescence. Materials (Basel) 2023; 16:1294. [PMID: 36770299 PMCID: PMC9919726 DOI: 10.3390/ma16031294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/18/2023] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
Two compounds based on pyridazine as the acceptor core and 9,9-dimethyl-9,10-dihydroacridine or phenoxazine donor moieties were designed and synthesized by Buchwald-Hartwig cross-coupling reaction. The electronic, photophysical, and electrochemical properties of the compounds were studied by ultraviolet-visible spectroscopy (UV-vis), photoluminescence spectrometry, differential scanning calorimetry, thermogravimetric analysis, and cyclic voltammetry. The compounds are characterized by high thermal stabilities. Their 5% weight loss temperatures are 314 and 336 °C. Complete weight loss of both pyridazine-based compounds was detected by TGA, indicating sublimation. The derivative of pyridazine and 9,9-dimethyl-9,10-dihydroacridine is capable of glass formation. Its glass transition temperature is 80 °C. The geometries and electronic characteristics of the compounds were substantiated using density functional theory (DFT). The compounds exhibited emission from the intramolecular charge transfer state manifested by positive solvatochromism. The emission in the range of 534-609 nm of the toluene solutions of the compounds is thermally activated delayed fluorescence with lifetimes of 93 and 143 ns, respectively.
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Affiliation(s)
- Levani Skhirtladze
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51423 Kaunas, Lithuania
| | - Oleksandr Bezvikonnyi
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51423 Kaunas, Lithuania
- Department of Physics, Faculty of Mathematics and Natural Science, Kaunas University of Technology, LT-51369 Kaunas, Lithuania
| | - Rasa Keruckienė
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51423 Kaunas, Lithuania
| | - Lukas Dvylys
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51423 Kaunas, Lithuania
| | - Malek Mahmoudi
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51423 Kaunas, Lithuania
| | - Linas Labanauskas
- Center for Physical Sciences & Technology, Department of Organic Chemistry, LT-10257 Vilnius, Lithuania
| | - Azhar Ariffin
- Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Juozas V. Grazulevicius
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, LT-51423 Kaunas, Lithuania
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10
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Marchi Luciano H, Farias G, Salla CM, Franca LG, Kuila S, Monkman AP, Durola F, Bechtold IH, Bock H, Gallardo H. Room Temperature Phosphorescence in Solution from Thiophene-Bridged Triply Donor-Substituted Tristriazolotriazines. Chemistry 2023; 29:e202203800. [PMID: 36648938 DOI: 10.1002/chem.202203800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/17/2023] [Accepted: 01/17/2023] [Indexed: 01/18/2023]
Abstract
Most organic room-temperature phosphorescence (RTP) emitters do not show their RTP in solution. Here, we incorporated sulfur-containing thiophene bridges between the donor and acceptor moieties in D3 A-type tristriazolotriazines (TTTs). The thiophene inclusion increased the spin-orbit coupling associated with the radiative T1 →S0 pathway, allowing RTP to be observed in solution for all compounds, likely assisted by protection of the emissive TTT-thiophene core from the environment by the bulky peripheral donors.
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Affiliation(s)
- Hugo Marchi Luciano
- Departamento de Química, Universidade Federal de Santa Catarina Trindade, 88040-900, Florianópolis, SC, Brazil.,Centre de Recherche Paul Pascal, Université Bordeaux, 115 av. Schweitzer, 33600, Pessac, France
| | - Giliandro Farias
- Departamento de Química, Universidade Federal de Santa Catarina Trindade, 88040-900, Florianópolis, SC, Brazil
| | - Cristian M Salla
- Departamento de Física, Universidade Federal de Santa Catarina Trindade, 88040-900, Florianópolis, SC, Brazil
| | | | - Suman Kuila
- Department of Physics, Durham University, Durham, DH1 3LE, UK
| | | | - Fabien Durola
- Centre de Recherche Paul Pascal, CNRS, 115 av. Schweitzer, 33600, Pessac, France
| | - Ivan H Bechtold
- Departamento de Física, Universidade Federal de Santa Catarina Trindade, 88040-900, Florianópolis, SC, Brazil
| | - Harald Bock
- Centre de Recherche Paul Pascal, CNRS, 115 av. Schweitzer, 33600, Pessac, France
| | - Hugo Gallardo
- Departamento de Química, Universidade Federal de Santa Catarina Trindade, 88040-900, Florianópolis, SC, Brazil
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11
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Franca LG, dos Santos PL, Pander P, Cabral MB, Cristiano R, Cazati T, Monkman AP, Bock H, Eccher J. Delayed Fluorescence by Triplet-Triplet Annihilation from Columnar Liquid Crystal Films. ACS Appl Electron Mater 2022; 4:3486-3494. [PMID: 35910938 PMCID: PMC9330766 DOI: 10.1021/acsaelm.2c00432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Delayed fluorescence (DF) by triplet-triplet annihilation (TTA) is observed in solutions of a benzoperylene-imidoester mesogen that shows a hexagonal columnar mesophase at room temperature in the neat state. A similar benzoperylene-imide with a slightly smaller HOMO-LUMO gap, that also is hexagonal columnar liquid crystalline at room temperature, does not show DF in solution, and mixtures of the two mesogens show no DF in solution either, because of collisional quenching of the excited triplet states on the imidoester by the imide. In contrast, DF by TTA from the imide but not from the imidoester is observed in condensed films of such mixtures, even though neat films of either single material are not displaying DF. In contrast to the DF from the monomeric imidoester in solution, DF of the imide occurs from dimeric aggregates in the blend films, assisted by the imidoester. Thus, the close contact of intimately stacked molecules of the two different species in the columnar mesophase leads to a unique mesophase-assisted aggregate DF. This constitutes the first observation of DF by TTA from the columnar liquid crystalline state. If the imide is dispersed in films of polybromostyrene, which provides an external heavy-atom effect facilitating triplet formation, DF is also observed. Organic light-emitting diodes (OLEDs) devices incorporating these liquid crystal molecules demonstrated high external quantum efficiency (EQE). On the basis of the literature and to the best of our knowledge, the EQE reported is the highest among nondoped solution-processed OLED devices using a columnar liquid crystal molecule as the emitting layer.
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Affiliation(s)
- Larissa G. Franca
- Department
of Physics, Durham University, South Road, Durham, DH1 3LE, United
Kingdom
- Departamento
de Física, Universidade Federal de
Santa Catarina, 88040900, Florianópolis, Santa Catarina, Brazil
| | - Paloma L. dos Santos
- Department
of Physics, Durham University, South Road, Durham, DH1 3LE, United
Kingdom
| | - Piotr Pander
- Department
of Physics, Durham University, South Road, Durham, DH1 3LE, United
Kingdom
- Faculty
of Chemistry, Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland
| | - Marília
G. B. Cabral
- Departamento
de Química, Universidade Federal
da Paraíba, CEP 58051-900, João Pessoa, Paraíba, Brazil
- Centre
de Recherche Paul-Pascal, CNRS & Université
de Bordeaux, 33600, Pessac, France
| | - Rodrigo Cristiano
- Departamento
de Química, Universidade Federal
da Paraíba, CEP 58051-900, João Pessoa, Paraíba, Brazil
| | - Thiago Cazati
- Departamento
de Física, Universidade Federal de
Ouro Preto − UFOP, 35400-000, Ouro Preto, Minas
Gerais, Brazil
| | - Andrew P. Monkman
- Department
of Physics, Durham University, South Road, Durham, DH1 3LE, United
Kingdom
| | - Harald Bock
- Centre
de Recherche Paul-Pascal, CNRS & Université
de Bordeaux, 33600, Pessac, France
| | - Juliana Eccher
- Departamento
de Física, Universidade Federal de
Santa Catarina, 88040900, Florianópolis, Santa Catarina, Brazil
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12
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Rebollar E, Bañuelos J, de la Moya S, Eng J, Penfold T, Garcia-Moreno I. A Computational-Experimental Approach to Unravel the Excited State Landscape in Heavy-Atom Free BODIPY-Related Dyes. Molecules 2022; 27:4683. [PMID: 35897859 PMCID: PMC9330419 DOI: 10.3390/molecules27154683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 07/19/2022] [Accepted: 07/20/2022] [Indexed: 12/04/2022] Open
Abstract
We performed a time-gated laser-spectroscopy study in a set of heavy-atom free single BODIPY fluorophores, supported by accurate, excited-state computational simulations of the key low-lying excited states in these chromophores. Despite the strong fluorescence of these emitters, we observed a significant fraction of time-delayed (microseconds scale) emission associated with processes that involved passage through the triplet manifold. The accuracy of the predictions of the energy arrangement and electronic nature of the low-lying singlet and triplet excited states meant that an unambiguous assignment of the main deactivation pathways, including thermally activated delayed fluorescence and/or room temperature phosphorescence, was possible. The observation of triplet state formation indicates a breakthrough in the "classic" interpretation of the photophysical properties of the renowned BODIPY and its derivatives.
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Affiliation(s)
- Esther Rebollar
- Departamento Química-Física de Materiales, Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain;
| | - Jorge Bañuelos
- Departamento de Química Física, Universidad del País Vasco-EHU, Apartado 644, 48080 Bilbao, Spain
| | - Santiago de la Moya
- Departamento Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain;
| | - Julien Eng
- Chemistry Department, School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon-Tyne NE1 7RU, UK; (J.E.); (T.P.)
| | - Thomas Penfold
- Chemistry Department, School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon-Tyne NE1 7RU, UK; (J.E.); (T.P.)
| | - Inmaculada Garcia-Moreno
- Departamento Química-Física de Materiales, Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain;
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13
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Lukács H, Jócsák I, Somfalvi-Tóth K, Keszthelyi S. Physiological Responses Manifested by Some Conventional Stress Parameters and Biophoton Emission in Winter Wheat as a Consequence of Cereal Leaf Beetle Infestation. Front Plant Sci 2022; 13:839855. [PMID: 35873954 PMCID: PMC9298668 DOI: 10.3389/fpls.2022.839855] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 05/09/2022] [Indexed: 05/31/2023]
Abstract
Oulema melanopus L. (Coleoptera: Chrysomelidae) is one of the most serious pests of winter wheat that causes peeling of the epidermis and tissue loss. The complex mapping of the physiological responses triggered by O. melanopus as a biotic stressor in winter wheat has not been fully explored with the help of non-invasive imaging and analytical assays, yet. The aim of the present work was to study the effect of O. melanopus on the physiological processes of winter wheat, especially on the extent of lipid peroxidation and antioxidant activity derived from tissue destruction, as well as photosynthetic ability. The results of the measurements enabled the identification of the antioxidant and lipid-oxidation-related physiological reactions, and they were reflected in the dynamics of non-invasive biophoton emissions. Our non-invasive approach pointed out that in the case of O. melanopus infestation the damage is manifested in tissue loss and the systemic signaling of the biotic stress may have reached other plant parts as well, which was confirmed by the results of antioxidant capacity measurements. These results indicate that the plant reacts to the biotic stress at a whole organizational level. We identified that the antioxidant and lipid-oxidation-related physiological reactions were reflected in the dynamics of two aspects of biophoton emission: delayed fluorescence and ultra-weak bioluminescence. Our research further supported that the non-invasive approach to stress assessment may complete and detail the traditional stress indicators.
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Affiliation(s)
| | | | | | - Sándor Keszthelyi
- Institute of Agronomy, Hungarian University of Agriculture and Life Sciences, Kaposvár, Hungary
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14
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Liu Y, Kang X, Xu Y, Li Y, Wang S, Wang C, Hu W, Wang R, Liu J. Modulating the Carbonization Degree of Carbon Dots for Multicolor Afterglow Emission. ACS Appl Mater Interfaces 2022; 14:22363-22371. [PMID: 35507422 DOI: 10.1021/acsami.2c01804] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Organic afterglow materials based on carbon dots (CDs) have aroused extensive attention for their potential applications in sensing, photoelectric devices, and anticounterfeiting. Effective methods to control the CD structure and modulate the energy levels are critical but still challenging. Here, we demonstrate a method to modulate the afterglow emission of CDs@SiO2 composites by controlling the carbonization degree of CDs with variable calcining temperatures. The CDs@SiO2-Raw prepared with a hydrothermal bottom-up synthesis method shows a more polymerized structure of CDs with low carbonization degree, which emits long-lived thermally activated delayed fluorescence (TADF) with the lifetime of 252 ms. After calcination at 550 °C, CDs@SiO2-550 exhibits a larger conjugated π-domain structure with higher carbonization degree, thus inducing room-temperature phosphorescence (RTP) emission with a lifetime of 451 ms. The transformation of the carbonization degree of CD structures leads to changes in energy levels and ΔEST, which affect their afterglow luminescence behaviors. This work proposes a new concept to modulate the afterglow emission of CDs@SiO2 composites and forecasts potential applications of CD-based afterglow materials.
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Affiliation(s)
- Yancong Liu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
| | - Xin Kang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
| | - Yiqian Xu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
| | - Yaorui Li
- College of Nuclear Science and Technology, Harbin Engineering University, 145 Nantong Street, Harbin 150001, China
| | - Shuang Wang
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China
| | - Chunyan Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
| | - Weiquan Hu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
| | - Ruihong Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
| | - Jiancong Liu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
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15
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Dai X, Hu Y, Sun Y, Huo M, Dong X, Liu Y. A Highly Efficient Phosphorescence/Fluorescence Supramolecular Switch Based on a Bromoisoquinoline Cascaded Assembly in Aqueous Solution. Adv Sci (Weinh) 2022; 9:e2200524. [PMID: 35285166 PMCID: PMC9108601 DOI: 10.1002/advs.202200524] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/18/2022] [Indexed: 05/07/2023]
Abstract
Despite ongoing research into photocontrolled supramolecular switches, reversible photoswitching between room-temperature phosphorescence (RTP) and delayed fluorescence is rare in the aqueous phase. Herein, an efficient RTP-fluorescence switch based on a cascaded supramolecular assembly is reported, which is constructed using a 6-bromoisoquinoline derivative (G3 ), cucurbit[7]uril (CB[7]), sulfonatocalix[4]arene (SC4A4), and a photochromic spiropyran (SP) derivative. Benefiting from the confinement effect of CB[7], initial complexation with CB[7] arouses an emerging RTP signal at 540 nm for G3 . This structure subsequently coassembles with amphiphilic SC4A4 to form tight spherical nanoparticles, thereby further facilitating RTP emission (≈12 times) in addition to a prolonged lifetime (i.e., 1.80 ms c.f., 50.1 µs). Interestingly, following cascaded assembly with a photocontrolled energy acceptor (i.e., SP), the efficient light-driven RTP energy transfer occurs when SP is transformed to its fluorescent merocyanine (MC) state. Ultimately, this endows the final system with an excellent RTP-fluorescence photoswitching property accompanied by multicolor tunable long-lived emission. Moreover, this switching process can be reversibly modulated over multiple cycles under alternating UV and visible photoirradiation. Finally, the prepared switch is successfully applied to photocontrolled multicolor cell labeling to offer a new approach for the design and fabrication of novel advanced light-responsive RTP materials in aqueous environments.
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Affiliation(s)
- Xian‐Yin Dai
- College of ChemistryState Key Laboratory of Elemento‐Organic ChemistryNankai UniversityTianjin300071P. R. China
| | - Yu‐Yang Hu
- College of ChemistryState Key Laboratory of Elemento‐Organic ChemistryNankai UniversityTianjin300071P. R. China
| | - Yonghui Sun
- College of ChemistryState Key Laboratory of Elemento‐Organic ChemistryNankai UniversityTianjin300071P. R. China
| | - Man Huo
- College of ChemistryState Key Laboratory of Elemento‐Organic ChemistryNankai UniversityTianjin300071P. R. China
| | - Xiaoyun Dong
- College of ChemistryState Key Laboratory of Elemento‐Organic ChemistryNankai UniversityTianjin300071P. R. China
| | - Yu Liu
- College of ChemistryState Key Laboratory of Elemento‐Organic ChemistryNankai UniversityTianjin300071P. R. China
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16
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Zhu J, Hu J, Hu Q, Zhang X, Ushakova EV, Liu K, Wang S, Chen X, Shan C, Rogach AL, Bai X. White Light Afterglow in Carbon Dots Achieved via Synergy between the Room-Temperature Phosphorescence and the Delayed Fluorescence. Small 2022; 18:e2105415. [PMID: 34787363 DOI: 10.1002/smll.202105415] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/14/2021] [Indexed: 05/25/2023]
Abstract
Carbon dot (CD) based long-lived afterglow emission materials have attracted attention in recent years, but demonstration of white-light room-temperature afterglow remains challenging, due to the difficulty of simultaneous generation of multiple long-lived excited states with distinct chromatic emission. In this work, a white-light room-temperature long-lived afterglow emission from a CD powder with a high efficiency of 5.8% and Commission International de l'Eclairage (CIE) coordinates of (0.396, 0.409) is realized. The afterglow of the CDs originates from a synergy between the phosphorescence of the carbon core and the delayed fluorescence associated with the surface CN moieties, which is accomplished by matching the singlet state of the surface groups of the CDs with the long-lived triplet state of the carbon core, resulting in an efficient energy transfer. It is demonstrated how the long-lived afterglow emission of CDs can be utilized for fabrication of white light emitting devices and in anticounterfeiting applications.
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Affiliation(s)
- Jinyang Zhu
- State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Junhua Hu
- State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Qiang Hu
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, P. R. China
| | - Xiaoyu Zhang
- College of Materials Science and Engineering, Jilin University, Changchun, 130012, P. R. China
| | - Elena V Ushakova
- Center of Information Optical Technologies, ITMO University, 49 Kronverksky Pr., Saint Petersburg, 197101, Russia
| | - Kaikai Liu
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Shixun Wang
- Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China
| | - Xu Chen
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Chongxin Shan
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Andrey L Rogach
- Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China
- Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, P. R. China
| | - Xue Bai
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, P. R. China
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17
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Garain S, Garain BC, Eswaramoorthy M, Pati SK, George SJ. Light-Harvesting Supramolecular Phosphors: Highly Efficient Room Temperature Phosphorescence in Solution and Hydrogels. Angew Chem Int Ed Engl 2021; 60:19720-19724. [PMID: 34189815 DOI: 10.1002/anie.202107295] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/21/2021] [Indexed: 11/10/2022]
Abstract
Solution phase room-temperature phosphorescence (RTP) from organic phosphors is seldom realized. Herein we report one of the highest quantum yield solution state RTP (ca. 41.8 %) in water, from a structurally simple phthalimide phosphor, by employing an organic-inorganic supramolecular scaffolding strategy. We further use these supramolecular hybrid phosphors as a light-harvesting scaffold to achieve delayed fluorescence from orthogonally anchored Sulforhodamine acceptor dyes via an efficient triplet to singlet Förster resonance energy transfer (TS-FRET), which is rarely achieved in solution. Electrostatic cross-linking of the inorganic scaffold at higher concentrations further facilitates the formation of self-standing hydrogels with efficient RTP and energy-transfer mediated long-lived fluorescence.
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Affiliation(s)
- Swadhin Garain
- New Chemistry Unit and School of Advanced Material (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India
| | | | - Muthusamy Eswaramoorthy
- New Chemistry Unit and School of Advanced Material (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India.,Chemistry and Physics of Materials Unit, JNCASR, India
| | - Swapan K Pati
- New Chemistry Unit and School of Advanced Material (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India.,Theoretical Science Unit, JNCASR, India
| | - Subi J George
- New Chemistry Unit and School of Advanced Material (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore, 560064, India
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18
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Lee HL, Oh CS, Lee KH, Lee JY, Hong WP. Lifetime-Extending 3-(4-Phenylbenzo[4,5]thieno[3,2- d]pyrimidin-2-yl)benzonitrile Acceptor for Thermally Activated Delayed Fluorescence Emitters. ACS Appl Mater Interfaces 2021; 13:2908-2918. [PMID: 33404213 DOI: 10.1021/acsami.0c17819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Highly efficient and long-living green thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were developed using benzothienopyrimidine-4-benzonitrile acceptor-derived compounds as the TADF emitters. A molecular design merging the benzothienopyrimidine-4-benzonitrile acceptor with either indolocarbazole or diindolocarbazole was employed to prepare two TADF emitters, 5-(2-phenylbenzo[4,5]thieno[3,2-d]pyrimidin-4-yl)-2-(5-phenylindolo[3,2-a]carbazol-12(5H)-yl)benzonitrile and 2-(10,15-diphenyl-10,15-dihydro-5H-diindolo[3,2-a:3',2'-c]carbazol-5-yl)-5-(2-phenylbenzo[4,5]thieno[3,2-d]pyrimidin-4-yl)benzonitrile (BTPDIDCz), as the green and greenish-yellow emitters. Among the two emitters, BTPDIDCz with the diindolocarbazole donor combined with the benzothienopyrimidine-4-benzonitrile acceptor demonstrated a high external quantum efficiency of 24.5% and 3 times longer device lifetime than the state-of-the-art green emitter. This work proposed the potential of benzothienopyrimidine-4-benzonitrile as the acceptor for long lifetime in TADF emitters.
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Affiliation(s)
- Ha Lim Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea
| | - Chan Seok Oh
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea
| | - Kyung Hyung Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea
| | - Wan Pyo Hong
- School of Advanced Material and Chemical Engineering, Daegu Catholic University, 13-13, Hayang-ro, Hayang-eup, Gyeonsan-si, Gyeongbuk 38430, Korea
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19
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Narsaria AK, Rauch F, Krebs J, Endres P, Friedrich A, Krummenacher I, Braunschweig H, Finze M, Nitsch J, Bickelhaupt FM, Marder TB. Computationally Guided Molecular Design to Minimize the LE/CT Gap in D-π-A Fluorinated Triarylboranes for Efficient TADF via D and π-Bridge Tuning. Adv Funct Mater 2020; 30:2002064. [PMID: 32774198 PMCID: PMC7405949 DOI: 10.1002/adfm.202002064] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 03/29/2020] [Accepted: 04/03/2020] [Indexed: 05/16/2023]
Abstract
In this combined experimental and theoretical study, a computational protocol is reported to predict the excited states in D-π-A compounds containing the B(FXyl)2 (FXyl = 2,6-bis(trifluoromethyl)phenyl) acceptor group for the design of new thermally activated delayed fluorescence (TADF) emitters. To this end, the effect of different donor and π-bridge moieties on the energy gaps between local and charge-transfer singlet and triplet states is examined. To prove this computationally aided design concept, the D-π-B(FXyl)2 compounds 1-5 were synthesized and fully characterized. The photophysical properties of these compounds in various solvents, polymeric film, and in a frozen matrix were investigated in detail and show excellent agreement with the computationally obtained data. Furthermore, a simple structure-property relationship is presented on the basis of the molecular fragment orbitals of the donor and the π-bridge, which minimize the relevant singlet-triplet gaps to achieve efficient TADF emitters.
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Affiliation(s)
- Ayush K. Narsaria
- Department of Theoretical ChemistryAmsterdam Institute of Molecular and Life Sciences (AIMMS)and Amsterdam Center for Multiscale Modeling (ACMM)Vrije Universiteit AmsterdamDe Boelelaan 1083AmsterdamNL‐1081 HVThe Netherlands
| | - Florian Rauch
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Johannes Krebs
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Peter Endres
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Alexandra Friedrich
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Ivo Krummenacher
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Holger Braunschweig
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Maik Finze
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - Jörn Nitsch
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
| | - F. Matthias Bickelhaupt
- Department of Theoretical ChemistryAmsterdam Institute of Molecular and Life Sciences (AIMMS)and Amsterdam Center for Multiscale Modeling (ACMM)Vrije Universiteit AmsterdamDe Boelelaan 1083AmsterdamNL‐1081 HVThe Netherlands
- Institute for Molecules and Materials (IMM)Radboud UniversityHeyendaalseweg 135NijmegenNL‐6525 AJThe Netherlands
| | - Todd B. Marder
- Institute for Inorganic ChemistryJulius‐Maximilians‐Universität WürzburgAm HublandWürzburgD‐97074Germany
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20
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Kumar R, Aggarwal H, Srivastava A. Of Twists and Curves: Electronics, Photophysics, and Upcoming Applications of Non-Planar Conjugated Organic Molecules. Chemistry 2020; 26:10653-10675. [PMID: 32118325 DOI: 10.1002/chem.201905071] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 02/02/2020] [Indexed: 01/02/2023]
Abstract
Non-planar conjugated organic molecules (NPCOMs) contain π-conjugation across their length and also exhibit asymmetry in their conformation. In other words, certain molecular fragments in NPCOMs are either twisted or curved out of planarity. This conformational asymmetry in NPCOMs leads to non-uniform charge-distribution across the molecule, with important photophysical and electronic consequences such as altered thermodynamic stability, chemical reactivity, as well as materials properties. Majorly, NPCOMs can be classified as having either Fused or Rotatable architectures. NPCOMs have been the focus of significant scientific attention in the recent past due to their exciting photophysical behavior that includes intramolecular charge-transfer (ICT), thermally activated delayed fluorescence (TADF) and long-lived charge-separated states. In addition, they also have many useful materials characteristics such as biradical character, semi-conductivity, dynamic conformations, and mechanochromism. As a result, rational design of NPCOMs and mapping their structure-property correlations has become imperative. Researchers have executed conformational changes in NPCOMs through a variety of external stimuli such as pH, temperature, anions-cations, solvent, electric potential, and mechanical force in order to tailor their photophysical, optoelectronic and magnetic properties. Converging to these points, this review highlights the lucrative electronic features, photophysical traits and upcoming applications of NPCOMs by a selective survey of the recent scientific literature.
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Affiliation(s)
- Rajesh Kumar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal (IISER Bhopal), Bhauri, Bhopal Bypass Road, Bhopal, 462066, India
| | - Himanshu Aggarwal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal (IISER Bhopal), Bhauri, Bhopal Bypass Road, Bhopal, 462066, India
| | - Aasheesh Srivastava
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal (IISER Bhopal), Bhauri, Bhopal Bypass Road, Bhopal, 462066, India
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21
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Sasabe H, Chikayasu Y, Ohisa S, Arai H, Ohsawa T, Komatsu R, Watanabe Y, Yokoyama D, Kido J. Molecular Orientations of Delayed Fluorescent Emitters in a Series of Carbazole-Based Host Materials. Front Chem 2020; 8:427. [PMID: 32528932 PMCID: PMC7262557 DOI: 10.3389/fchem.2020.00427] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 04/23/2020] [Indexed: 11/24/2022] Open
Abstract
Molecular orientation is one of the most crucial factors to boost the efficiency of organic light-emitting devices. However, active control of molecular orientation of the emitter molecule by the host molecule is rarely realized so far, and the underlying mechanism is under discussion. Here, we systematically investigated the molecular orientations of thermally activated delayed fluorescence (TADF) emitters in a series of carbazole-based host materials. Enhanced horizontal orientation of the TADF emitters was achieved. The degree of enhancement observed was dependent on the host material used. Consequently, our results indicate that π-π stacking, CH/n (n = O, N) weak hydrogen bonds, and multiple CH/π contacts greatly induce horizontal orientation of the TADF emitters in addition to the molecular shape anisotropy. Finally, we fabricated TADF-based organic light-emitting devices with an external quantum efficiency (ηext) of 26% using an emission layer with horizontal orientation ratio (Θ) of 79%, which is higher than that of an almost randomly oriented emission layer with Θ of 62% (ηext = 22%).
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Affiliation(s)
- Hisahiro Sasabe
- Research Center for Organic Electronics (ROEL), Yamagata University, Yamagata, Japan
- Frontier Center for Organic Materials (FROM), Yamagata University, Yamagata, Japan
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Yuki Chikayasu
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Satoru Ohisa
- Research Center for Organic Electronics (ROEL), Yamagata University, Yamagata, Japan
- Frontier Center for Organic Materials (FROM), Yamagata University, Yamagata, Japan
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Hiroki Arai
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Tatsuya Ohsawa
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Ryutaro Komatsu
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Yuichiro Watanabe
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Daisuke Yokoyama
- Research Center for Organic Electronics (ROEL), Yamagata University, Yamagata, Japan
- Frontier Center for Organic Materials (FROM), Yamagata University, Yamagata, Japan
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
| | - Junji Kido
- Research Center for Organic Electronics (ROEL), Yamagata University, Yamagata, Japan
- Frontier Center for Organic Materials (FROM), Yamagata University, Yamagata, Japan
- Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan
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Henke P, Dolanský J, Kubát P, Mosinger J. Multifunctional Photosensitizing and Biotinylated Polystyrene Nanofiber Membranes/Composites for Binding of Biologically Active Compounds. ACS Appl Mater Interfaces 2020; 12:18792-18802. [PMID: 32216378 DOI: 10.1021/acsami.9b23104] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A three-step postprocessing functionalization of pristine electrospun polystyrene nanofiber membranes was used for the preparation of nanostructured biotinylated materials with an externally bonded porphyrin photosensitizer. Subsequently, the material was able to strongly bind biologically active streptavidin derivatives while keeping its photosensitizing and antibacterial properties due to the generation of singlet oxygen under the exclusive control of visible light. The resulting multifunctional materials functionalized by a streptavidin-horseradish peroxidase conjugate as a model bioactive compound preserved its enzymatic activity even in the presence of a porphyrin photosensitizer with some quenching effect on the activity of the photosensitizer. Prolonged kinetics of both singlet oxygen luminescence and singlet oxygen-sensitized delayed fluorescence (SODF) were found after irradiation by visible light. The above results reflected less effective quenching of the porphyrin photosensitizer triplet state by ground state oxygen and indicated hindered oxygen transport (diffusion) due to surface functionalization. We found that SODF could be used as a valuable tool for optimizing photosensitizing efficiency as well as a tool for confirming surface functionalization. Full photosensitizing and enzyme activity could be achieved by a space separation of photosensitizers and enzyme/biomolecules in the nanofiber composites consisting of two layers. The upper layer contained a photosensitizer that generated antibacterial singlet oxygen upon irradiation by light, and the bottom layer retained enzymatic activity for biochemical reactions.
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Affiliation(s)
- Petr Henke
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 43 Prague 2, Czech Republic
| | - Jiří Dolanský
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 43 Prague 2, Czech Republic
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68, Husinec-Řež 1001, Czech Republic
| | - Pavel Kubát
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejškova 3, 182 23 Prague 8, Czech Republic
| | - Jiří Mosinger
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 43 Prague 2, Czech Republic
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68, Husinec-Řež 1001, Czech Republic
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Jung M, Lee KH, Lee JY. Molecular Engineering of Isomeric Benzofurocarbazole Donors for Photophysical Management of Thermally Activated Delayed Fluorescence Emitters. Chemistry 2020; 26:4816-4821. [PMID: 31967700 DOI: 10.1002/chem.201905473] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/02/2020] [Indexed: 11/08/2022]
Abstract
Benzofurocarbazole moieties are commonly used donor structures in the design of thermally activated delayed fluorescence (TADF) emitters. However, only 5 H-benzofuro[3,2-c]carbazole (34BFCz) has been reported and, to the best of our knowledge, no other benzofurocarbazole derivatives have been covered in the literature. In the present study, two further benzofurocarbazole moieties, 12 H-benzofuro[3,2-a]carbazole (12BFCz) and 7 H-benzofuro[2,3-b]carbazole (23BFCz), have been synthesized to investigate the effect of the donor structure on the photophysics and device parameters of TADF emitters. Two benzofurocarbazole-derived TADF emitters, 12-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-12 H-benzofuro[3,2-a]carbazole (o12BFCzTrz) and 7-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-7 H-benzofuro[2,3-b]carbazole (o23BFCzTrz), have been compared with 5-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5 H-benzofuro[3,2-c]carbazole (oBFCzTrz). The benzofurocarbazole donor structure governs the TADF characteristics, such as charge-transfer property and emission color. The 12BFCz donor has proved to be effective in blue-shifting the emission color, and 34BFCz has proven useful for improving the external quantum efficiency (EQE). The 12BFCz-derived o12BFCzTrz showed blue-shifted color coordinates of (0.159, 0.288), compared to (0.178, 0388) for o23BFCzTrz and (0.169, 0.341) for oBFCzTrz. The 34BFCz-derived oBFCzTrz exhibited an EQE of 22.9 %, compared to 19.2 % for o12BFCzTrz and 21.1 % for o23BFCzTrz.
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Affiliation(s)
- Mina Jung
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 16419, Republic of Korea
| | - Kyung Hyung Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 16419, Republic of Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 16419, Republic of Korea
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24
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Scholz M, Gunn JR, Luke GP, Pogue BW. Imaging of singlet oxygen feedback delayed fluorescence and lysosome permeabilization in tumor in vivo during photodynamic therapy with aluminum phthalocyanine. J Biomed Opt 2020; 25:1-14. [PMID: 31920049 PMCID: PMC6951482 DOI: 10.1117/1.jbo.25.6.063806] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 12/12/2019] [Indexed: 05/20/2023]
Abstract
Significance: Singlet oxygen is a key cytotoxic agent in photodynamic therapy (PDT). As such, its imaging is highly desirable, but existing direct imaging methods are still limited by the exceptionally low yield of the luminescence signal. Singlet oxygen feedback delayed fluorescence (SOFDF) of the photosensitizer is a higher yield alternative for indirect measurement of this signal. <p> Aim: The aim was to explore feasibility of SOFDF imaging in vivo in tumor-bearing mice during PDT and investigate how SOFDF images can be transformed into images of singlet oxygen. In addition, we study whether lysosome permeabilization can be visualized through fluorescence lifetime.</p> <p> Approach: Mice were intravenously injected with 2.5 mg/kg of photosensitizer aluminum(III) phthalocyanine tetrasulfonate (AlPcS4) 20 h prior to experiments, having subcutaneous BxPC3 pancreas tumors. Time-resolved delayed fluorescence and prompt fluorescence (PF) were imaged using an intensified time-gated camera with 10-Hz pulsed laser excitation at 690 nm. </p> <p> Results: Delayed emission from AlPcS4 was detected with lifetimes 7 to 11 μs, which was attributed to SOFDF and shown to be oxygen-dependent. Singlet oxygen images were approximated by the ratio of SOFDF/PF at each pixel. SOFDF images of a good quality could be captured within several seconds with a radiant exposure of ∼20 mJ / cm2. In addition, lifetime images of AlPcS4 PF in ns-time domain enabled us to visualize the event of lysosome permeabilization, as the lifetime increased from ∼4.7 to 5.2 ns. </p> <p> Conclusions: Imaging of SOFDF in vivo in mouse tumor during PDT with AlPcS4 is feasible, and it is a promising method for singlet molecular oxygen monitoring. Moreover, the time-gated approach also enables visualization of the lysosome permeabilization that alters the PF lifetime. </p>
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Affiliation(s)
- Marek Scholz
- Dartmouth College, Thayer School of Engineering, Center for Imaging Medicine, Hanover, New Hampshire, United States
- Address all correspondence to Marek Scholz, E-mail: ; Brian W. Pogue, E-mail:
| | - Jason R. Gunn
- Dartmouth College, Thayer School of Engineering, Center for Imaging Medicine, Hanover, New Hampshire, United States
| | - Geoffrey P. Luke
- Dartmouth College, Thayer School of Engineering, Center for Imaging Medicine, Hanover, New Hampshire, United States
| | - Brian W. Pogue
- Dartmouth College, Thayer School of Engineering, Center for Imaging Medicine, Hanover, New Hampshire, United States
- Address all correspondence to Marek Scholz, E-mail: ; Brian W. Pogue, E-mail:
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25
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Kuila S, Ghorai A, Samanta PK, Siram RBK, Pati SK, Narayan KS, George SJ. Red-Emitting Delayed Fluorescence and Room Temperature Phosphorescence from Core-Substituted Naphthalene Diimides. Chemistry 2019; 25:16007-16011. [PMID: 31617260 DOI: 10.1002/chem.201904651] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Indexed: 01/24/2023]
Abstract
Unprecedented ambient triplet-mediated emission in core-substituted naphthalene diimide (cNDI) derivatives is unveiled via delayed fluorescence and room temperature phosphorescence. Carbazole core-substituted cNDIs, with a donor-acceptor design, showed deep-red triplet emission in solution processable films with high quantum yield. This study, with detailed theoretical calculations and time-resolved emission experiments, enables new design insights into the triplet harvesting of cNDIs; an important family of molecules which has been, otherwise, extensively been investigated for its n-type electronic character and tunable singlet fluorescence.
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Affiliation(s)
- Suman Kuila
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Anaranya Ghorai
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - Pralok K Samanta
- Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - Raja B K Siram
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
| | - Swapan K Pati
- Theoretical Science Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - K S Narayan
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, 560064, India
| | - Subi J George
- New Chemistry Unit and School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore, 560064, India
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26
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Wang M, Huang YH, Lin KS, Yeh TH, Duan J, Ko TY, Liu SW, Wong KT, Hu B. Revealing the Cooperative Relationship between Spin, Energy, and Polarization Parameters toward Developing High-Efficiency Exciplex Light-Emitting Diodes. Adv Mater 2019; 31:e1904114. [PMID: 31566271 DOI: 10.1002/adma.201904114] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 09/06/2019] [Indexed: 06/10/2023]
Abstract
Experimental studies to reveal the cooperative relationship between spin, energy, and polarization through intermolecular charge-transfer dipoles to harvest nonradiative triplets into radiative singlets in exciplex light-emitting diodes are reported. Magneto-photoluminescence studies reveal that the triplet-to-singlet conversion in exciplexes involves an artificially generated spin-orbital coupling (SOC). The photoinduced electron parametric resonance measurements indicate that the intermolecular charge-transfer occurs with forming electric dipoles (D+• →A-• ), providing the ionic polarization to generate SOC in exciplexes. By having different singlet-triplet energy differences (ΔEST ) in 9,9'-diphenyl-9H,9'H-3,3'-bicarbazole (BCzPh):3',3'″,3'″″-(1,3,5-triazine-2,4,6-triyl)tris(([1,1'-biphenyl]-3-carbonitrile)) (CN-T2T) (ΔEST = 30 meV) and BCzPh:bis-4,6-(3,5-di-3-pyridylphenyl)-2-methyl-pyrimidine (B3PYMPM) (ΔEST = 130 meV) exciplexes, the SOC generated by the intermolecular charge-transfer states shows large and small values (reflected by different internal magnetic parameters: 274 vs 17 mT) with high and low external quantum efficiency maximum, EQEmax (21.05% vs 4.89%), respectively. To further explore the cooperative relationship of spin, energy, and polarization parameters, different photoluminescence wavelengths are selected to concurrently change SOC, ΔEST , and polarization while monitoring delayed fluorescence. When the electron clouds become more deformed at a longer emitting wavelength due to reduced dipole (D+• →A-• ) size, enhanced SOC, increased orbital polarization, and decreased ΔEST can simultaneously occur to cooperatively operate the triplet-to-singlet conversion.
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Affiliation(s)
- Miaosheng Wang
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Yi-Hsuan Huang
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Science, Academia Sinica, Taipei, 10617, Taiwan
| | - Kai-Siang Lin
- Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
- Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
| | - Tzu-Hung Yeh
- Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
| | - Jiashun Duan
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Tzu-Yu Ko
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Science, Academia Sinica, Taipei, 10617, Taiwan
| | - Shun-Wei Liu
- Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
- Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
| | - Ken-Tsung Wong
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Science, Academia Sinica, Taipei, 10617, Taiwan
| | - Bin Hu
- Joint Institute for Advanced Materials, Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
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Dąbrowski P, Baczewska-Dąbrowska AH, Kalaji HM, Goltsev V, Paunov M, Rapacz M, Wójcik-Jagła M, Pawluśkiewicz B, Bąba W, Brestic M. Exploration of Chlorophyll a Fluorescence and Plant Gas Exchange Parameters as Indicators of Drought Tolerance in Perennial Ryegrass. Sensors (Basel) 2019; 19:E2736. [PMID: 31216685 PMCID: PMC6631610 DOI: 10.3390/s19122736] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 05/18/2019] [Accepted: 06/04/2019] [Indexed: 11/16/2022]
Abstract
Perennial ryegrass (Lolium perenne L.) belongs to the common cultivated grass species in Central and Western Europe. Despite being considered to be susceptible to drought, it is frequently used for forming the turf in urban green areas. In such areas, the water deficit in soil is recognized as one of the most important environmental factors, which can limit plant growth. The basic aim of this work was to explore the mechanisms standing behind the changes in the photosynthetic apparatus performance of two perennial ryegrass turf varieties grown under drought stress using comprehensive in vivo chlorophyll fluorescence signal analyses and plant gas exchange measurements. Drought was applied after eight weeks of sowing by controlling the humidity of the roots ground medium at the levels of 30, 50, and 70% of the field water capacity. Measurements were carried out at four times: 0, 120, and 240 h after drought application and after recovery (refilling water to 70%). We found that the difference between the two tested varieties' response resulted from a particular re-reduction of P700+ (reaction certer of PSI) that was caused by slower electron donation from P680. The difference in the rate of electron flow from Photosystem II (PSII) to PSI was also detected. The application of the combined tools (plants' photosynthetic efficiency analysis and plant gas exchange measurements) allowed exploring and explaining the specific variety response to drought stress.
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Affiliation(s)
- Piotr Dąbrowski
- Department of Environmental Improvement, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland.
| | - Aneta H Baczewska-Dąbrowska
- Polish Academy of Sciences Botanical Garden-Center for Biological Diversity Conservation in Powsin, 02-973 Warsaw, Poland.
| | - Hazem M Kalaji
- Department of Plant Physiology, Faculty of Agriculture and Biology, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland.
| | - Vasilij Goltsev
- Department of Biophysics and Radiobiology, Sofia University "St. Kl. Ohridski", 1164 Sofia, Bulgaria.
| | - Momchil Paunov
- Department of Biophysics and Radiobiology, Sofia University "St. Kl. Ohridski", 1164 Sofia, Bulgaria.
| | - Marcin Rapacz
- University of Agriculture in Kraków, Faculty of Agriculture and Economics, Department of Plant Physiology, 30-239 Krakow, Poland.
| | - Magdalena Wójcik-Jagła
- University of Agriculture in Kraków, Faculty of Agriculture and Economics, Department of Plant Physiology, 30-239 Krakow, Poland.
| | - Bogumiła Pawluśkiewicz
- Department of Environmental Improvement, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland.
| | - Wojciech Bąba
- Department of Plant Ecology, Institute of Botany, Faculty of Biology, Jagiellonian University, 30-387 Krakow, Poland.
| | - Marian Brestic
- Department of Plant Physiology, Slovak University of Agriculture in Nitra, 949 76 Nitra, Slovakia.
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Shang H, Shimotani H, Kanagasekaran T, Tanigaki K. Separation in the Roles of Carrier Transport and Light Emission in Light-Emitting Organic Transistors with a Bilayer Configuration. ACS Appl Mater Interfaces 2019; 11:20200-20204. [PMID: 31124645 DOI: 10.1021/acsami.9b02298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
To develop high-performance organic light-emitting organic field-effect transistors (LE-OFETs), a fundamental problem in organic semiconductors is to compromise light luminescent efficiency for high carrier mobility and vice versa. Therefore, LE-OFETs can avoid this problem by separating the light-emission and carrier-transport functions. Here, a bilayer LE-OFET composed of a tetracene crystal as a carrier transporter (bottom crystal) and a 4-(dicyanomethylene)-2-methyl-6-( p-dimethylaminostyryl)-4 H-pyran (DCM1)-doped tetracene crystal as a light emitter (top crystal) was fabricated. Red light-emission color, which is distinct from the green emission color of tetracene, was detected in the top crystal. Light emission from the top layer was prohibited when an insulating thin film was inserted between the two crystals. These observations indicate that excitons are formed in the bottom crystal and transferred to the top crystal, emitting reddish light. Bilayer LE-OFETs have the advantage of providing both high current density and a bright emission for high-performance light-emitting FETs.
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Affiliation(s)
- Hui Shang
- Department of Physics , Tohoku University , 6-3, Aramaki Aza-Aoba , Aoba-ku, Sendai 980-8578 , Japan
| | - Hidekazu Shimotani
- Department of Physics , Tohoku University , 6-3, Aramaki Aza-Aoba , Aoba-ku, Sendai 980-8578 , Japan
| | - Thangavel Kanagasekaran
- Advanced Institute for Materials Research (AIMR) , Tohoku University , 2-2-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan
| | - Katsumi Tanigaki
- Advanced Institute for Materials Research (AIMR) , Tohoku University , 2-2-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan
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29
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Hu J, Li Q, Wang X, Shao S, Wang L, Jing X, Wang F. Developing Through-Space Charge Transfer Polymers as a General Approach to Realize Full-Color and White Emission with Thermally Activated Delayed Fluorescence. Angew Chem Int Ed Engl 2019; 58:8405-8409. [PMID: 30985050 DOI: 10.1002/anie.201902264] [Citation(s) in RCA: 101] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/04/2019] [Indexed: 11/10/2022]
Abstract
Through-space charge transfer polymers (TSCT polymers) that contain a non-conjugated polystyrene backbone and spatially separated donor and acceptor units for solution-processed OLEDs with full-color and white emission is reported. By tuning the charge transfer strength between donor and acceptors with different electron-accepting ability, emission color spanning from deep blue to red can be achieved. By incorporating two kinds of donor/acceptor pairs in one polymer to create duplex through-space charge-transfer channels, blue and yellow emission can be simultaneously obtained to realize white electroluminescence from a single polymer. The TSCT polymers exhibit thermally activated delayed fluorescence effect with delayed-component lifetimes in range of 0.36-1.98 μs, and unexpected aggregation-induced emission (emission intensity enhancement of up to 117 from solution to aggregation state).
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Affiliation(s)
- Jun Hu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China.,School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Qiang Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China.,School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Xingdong Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
| | - Shiyang Shao
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
| | - Lixiang Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
| | - Xiabin Jing
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
| | - Fosong Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
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30
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Salla CAM, Farias G, Rouzières M, Dechambenoit P, Durola F, Bock H, de Souza B, Bechtold IH. Persistent Solid-State Phosphorescence and Delayed Fluorescence at Room Temperature by a Twisted Hydrocarbon. Angew Chem Int Ed Engl 2019; 58:6982-6986. [PMID: 30908833 DOI: 10.1002/anie.201901672] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 03/18/2019] [Indexed: 11/10/2022]
Abstract
The dehydrating cyclotrimerization of 1-tetralone in the presence of titanium tetrachloride at high temperatures leads to homotruxene, a nonplanar arene in which the twist angles between its three outer benzene rings and the central benzene are stabilized by ethylene bridges. This non-planar configuration allows for pronounced spin-orbit coupling and a high triplet energy, leading to room-temperature phosphorescence in air with a lifetime of 0.38 s and a quantum yield of 5.6 %, clearly visible to the human eye after switching off the excitation. Triplet-triplet annihilation is found to simultaneously lead to a substantial delayed fluorescence, unprecedented from a pure hydrocarbon at ambient conditions, with a lifetime of 0.11 s.
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Affiliation(s)
- Cristian A M Salla
- Departamento de Física, Universidade Federal de Santa Catarina, 88040-900, Florianópolis, SC, Brazil
| | - Giliandro Farias
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900, Florianópolis, SC, Brazil
| | - Mathieu Rouzières
- Centre de Recherche Paul Pascal, CNRS & Université de Bordeaux, 115, av. Schweitzer, 33600, Pessac, France
| | - Pierre Dechambenoit
- Centre de Recherche Paul Pascal, CNRS & Université de Bordeaux, 115, av. Schweitzer, 33600, Pessac, France
| | - Fabien Durola
- Centre de Recherche Paul Pascal, CNRS & Université de Bordeaux, 115, av. Schweitzer, 33600, Pessac, France
| | - Harald Bock
- Centre de Recherche Paul Pascal, CNRS & Université de Bordeaux, 115, av. Schweitzer, 33600, Pessac, France
| | - Bernardo de Souza
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900, Florianópolis, SC, Brazil
| | - Ivan H Bechtold
- Departamento de Física, Universidade Federal de Santa Catarina, 88040-900, Florianópolis, SC, Brazil
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31
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Abstract
The success of organic light emitting diodes (OLED) has been witnessed by the commercialization of this technology for manufacturing the vivid and colorful displays used in our daily life now. The prospective growth of OLED technology on display industry will be optimistic. Over the last three decades, many different approaches on material and device designs have been implemented for improving the efficiency and stability of OLED devices. These efforts install main cornerstones to support the great achievement of OLED technology. However, until now, the performance and stability of blue OLEDs still have some concerns. This troublesome issue should be totally conquered before the large-scale manufactures dominated over other display technologies, particularly liquid crystal-based displays, takes place. Though significant progress has already been made to achieve high performance and long lifetime blue OLEDs, this topic still remains as one of the hot researches in OLEDs. We have been working on this area for about two decades and made some notable contributions. Consequently, in this personal account we have outlined our efforts to obtain better performing blue OLEDs by utilizing a range of emitters based on fluorescence, phosphorescence, delayed fluorescence and exciplex systems. We have also developed some novel host materials for blue OLEDs, which are worth mentioning in this account.
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Affiliation(s)
- Monima Sarma
- Department of Chemistry National Taiwan University, Taipei, 10617, Taiwan.,Department of Chemistry, KL University (KLEF), Vaddeswaram, Andhra Pradesh, 522502, India
| | - Ken-Tsung Wong
- Department of Chemistry National Taiwan University, Taipei, 10617, Taiwan.,Institute of Atomic and Molecular Science Academia Sinica, Taipei, 10617, Taiwan
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32
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Qu Y, Pander P, Bucinskas A, Vasylieva M, Tian Y, Miomandre F, Dias FB, Clavier G, Data P, Audebert P. Convenient One-Pot Synthesis of 1,2,3,4-Thiatriazoles Towards a Novel Electron Acceptor for Highly-Efficient Thermally-Activated Delayed-Fluorescence Emitters. Chemistry 2019; 25:2457-2462. [PMID: 30680814 DOI: 10.1002/chem.201805358] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/07/2018] [Indexed: 01/22/2023]
Abstract
A novel and unexpected convenient one-pot synthesis of 1,2,3,4-thiatriazoles has been discovered while investigating the classical tetrazine "Pinner synthesis". The synthetic route starts from commercially-available nitrile derivatives and gives good to high yields (51-80 %) with no need to isolate any thioacylating agents. The crucial impact of the solvent on the outcome of the modified "Pinner synthesis" is moreover examined and discussed. Using this new synthetic route, a novel donor-acceptor thiatriazole derivative has been prepared, which exhibits prominent thermally-activated delayed fluorescence (TADF) in both solution and film. The photoluminescence quantum yield (PLQY) in methylcyclohexane (MCH) and Zeonex (a cyclo olefin polymer) in oxygen-free conditions were determined to be 76 and 99 %, respectively. This work provides an efficient and practical synthetic approach to functionalized 1,2,3,4-thiatriazole derivatives, and will noticeably facilitate the application of 1,2,3,4-thiatriazole as an electron acceptor in organic electronics.
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Affiliation(s)
- Yangyang Qu
- PPSM, CNRS, ENS Paris-Saclay, 61 Avenue Président Wilson, 94235, Cachan, France
| | - Piotr Pander
- Physics Department, Durham University, South Road, Durham, DH1 3LE, UK
| | - Audrius Bucinskas
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, K. Baršausko St. 59, Kaunas, LT-51423, Lithuania
| | - Marharyta Vasylieva
- Faculty of Chemistry, Silesian University of Technology, M. Stzody 9, 44-100, Gliwice, Poland
| | - Yayang Tian
- PPSM, CNRS, ENS Paris-Saclay, 61 Avenue Président Wilson, 94235, Cachan, France
| | - Fabien Miomandre
- PPSM, CNRS, ENS Paris-Saclay, 61 Avenue Président Wilson, 94235, Cachan, France
| | - Fernando B Dias
- Physics Department, Durham University, South Road, Durham, DH1 3LE, UK
| | - Gilles Clavier
- PPSM, CNRS, ENS Paris-Saclay, 61 Avenue Président Wilson, 94235, Cachan, France
| | - Przemyslaw Data
- Physics Department, Durham University, South Road, Durham, DH1 3LE, UK.,Faculty of Chemistry, Silesian University of Technology, M. Stzody 9, 44-100, Gliwice, Poland
| | - Pierre Audebert
- PPSM, CNRS, ENS Paris-Saclay, 61 Avenue Président Wilson, 94235, Cachan, France
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33
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Neena KK, Sudhakar P, Thilagar P. Catalyst- and Template-Free Ultrafast Visible-Light-Triggered Dimerization of Vinylpyridine-Functionalized Tetraarylaminoborane: Intriguing Deep-Blue Delayed Fluorescence. Angew Chem Int Ed Engl 2018; 57:16806-16810. [PMID: 30345594 DOI: 10.1002/anie.201811353] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Indexed: 11/07/2022]
Abstract
A photoredox-catalyst- and template-free sunlight-induced molecular dimerization of a vinylpyridine-functionalized tetraarylaminoborane (TAAB) has been accomplished for the first time. The reaction is quantitative, highly regioselective, and thermally irreversible. The presence of the propeller-shaped TAAB framework allows selective photodimerization of one of the two vinyl pyridine units. Monomer 1 and photodimer 2 exhibit distinct photophysical properties with delayed fluorescence (DF) both in solution and the solid state, which was confirmed by steady-state and time-resolved luminescence studies. Quantum mechanical calculations were performed to support the experimental observations. Our new approach using [2+2] cycloaddition chemistry paves the way for the development of highly sought-after deep-blue DF materials.
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Affiliation(s)
- Kalluvettukuzhy K Neena
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Pagidi Sudhakar
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Pakkirisamy Thilagar
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
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34
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Dey A, Kabra D. Role of Bimolecular Exciton Kinetics in Controlling the Efficiency of Organic Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:38287-38293. [PMID: 30298717 DOI: 10.1021/acsami.8b10559] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Here, we have carried out a spectroscopic investigation on the operational organic light-emitting diodes (OLEDs) to determine the role of emission layer thickness on the optoelectronic performance of OLEDs based on a poly(9,9-dioctylfluorene- alt-benzothiadiazole) (F8BT) copolymer system. Our study shows that delayed fluorescence (DF) via triplet-triplet annihilation (TTA) contributes significantly to boost the OLED efficiency through its fractional contribution. Interestingly, we note that DF contribution varies as a function of the emissive layer thickness. From the time-resolved electroluminescence (TREL) and triplet absorption (under electrical excitation) studies, we have seen that the emissive layer thickness controls triplet exciton generation and decay processes. From TREL, we have also shown that singlet-triplet annihilation (STA) is the dominant fluorescence quenching mechanism in bulk of the emissive layer, whereas thinner devices have significant exciton quenching at the interface of the injection layer/F8BT. The strength of STA differs in thin versus thick samples, which has been correlated with the spectral & spatial overlap integral of singlet and triplet states. Hence, STA strength and triplet population density are critical parameters for an explanation of high efficiency in unusually thick F8BT OLEDs.
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Affiliation(s)
- Amrita Dey
- Department of Physics , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India
| | - Dinesh Kabra
- Department of Physics , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India
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35
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Zalibera M, Krylov DS, Karagiannis D, Will P, Ziegs F, Schiemenz S, Lubitz W, Reineke S, Savitsky A, Popov AA. Thermally Activated Delayed Fluorescence in a Y 3 N@C 80 Endohedral Fullerene: Time-Resolved Luminescence and EPR Studies. Angew Chem Int Ed Engl 2018; 57:277-281. [PMID: 29119650 PMCID: PMC5751888 DOI: 10.1002/anie.201710637] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Indexed: 12/25/2022]
Abstract
The endohedral fullerene Y3 N@C80 exhibits luminescence with reasonable quantum yield and extraordinary long lifetime. By variable-temperature steady-state and time-resolved luminescence spectroscopy, it is demonstrated that above 60 K the Y3 N@C80 exhibits thermally activated delayed fluorescence with maximum emission at 120 K and a negligible prompt fluorescence. Below 60 K, a phosphorescence with a lifetime of 192±1 ms is observed. Spin distribution and dynamics in the triplet excited state is investigated with X- and W-band EPR and ENDOR spectroscopies and DFT computations. Finally, electroluminescence of the Y3 N@C80 /PFO film is demonstrated opening the possibility for red-emitting fullerene-based organic light-emitting diodes (OLEDs).
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Affiliation(s)
- Michal Zalibera
- Max Planck Institute for Chemical Energy ConversionStiftstr. 34–3645470Mülheim an der RuhrGermany
- Institute of Physical Chemistry and Chemical PhysicsSlovak University of TechnologyRadlinského 981237BratislavaSlovakia
| | - Denis S. Krylov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Dimitrios Karagiannis
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics (IAP)TU DresdenNöthnitzer Str. 6101187DresdenGermany
| | - Paul‐Anton Will
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics (IAP)TU DresdenNöthnitzer Str. 6101187DresdenGermany
| | - Frank Ziegs
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Sandra Schiemenz
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy ConversionStiftstr. 34–3645470Mülheim an der RuhrGermany
| | - Sebastian Reineke
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics (IAP)TU DresdenNöthnitzer Str. 6101187DresdenGermany
| | - Anton Savitsky
- Max Planck Institute for Chemical Energy ConversionStiftstr. 34–3645470Mülheim an der RuhrGermany
| | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 2001069DresdenGermany
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36
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Geng Y, D'Aleo A, Inada K, Cui LS, Kim JU, Nakanotani H, Adachi C. Donor-σ-Acceptor Motifs: Thermally Activated Delayed Fluorescence Emitters with Dual Upconversion. Angew Chem Int Ed Engl 2017; 56:16536-16540. [PMID: 29105906 DOI: 10.1002/anie.201708876] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Indexed: 11/09/2022]
Abstract
A family of organic emitters with a donor-σ-acceptor (D-σ-A) motif is presented. Owing to the weakly coupled D-σ-A intramolecular charge-transfer state, a transition from the localized excited triplet state (3 LE) and charge-transfer triplet state (3 CT) to the charge-transfer singlet state (1 CT) occurred with a small activation energy and high photoluminescence quantum efficiency. Two thermally activated delayed fluorescence (TADF) components were identified, one of which has a very short lifetime of 200-400 ns and the other a longer TADF lifetime of the order of microseconds. In particular, the two D-σ-A materials presented strong blue emission with TADF properties in toluene. These results will shed light on the molecular design of new TADF emitters with short delayed lifetimes.
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Affiliation(s)
- Yan Geng
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Anthony D'Aleo
- Aix-Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288, Marseille, France.,Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, Republic of Korea
| | - Ko Inada
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Lin-Song Cui
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Jong Uk Kim
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Hajime Nakanotani
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,Japan Science and Technology Agency, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Chihaya Adachi
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,Japan Science and Technology Agency, ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
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37
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Seo JA, Im Y, Han SH, Lee CW, Lee JY. Unconventional Molecular Design Approach of High-Efficiency Deep Blue Thermally Activated Delayed Fluorescent Emitters Using Indolocarbazole as an Acceptor. ACS Appl Mater Interfaces 2017; 9:37864-37872. [PMID: 28980471 DOI: 10.1021/acsami.7b09351] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Unconventional blue thermally activated delayed fluorescent emitters having electron-donating type indolocarbazole as an acceptor were developed by attaching carbazolylcarbazole or acridine donors to the indolocarbazole acceptor. Three compounds were derived from the indolocarbazole acceptor. The indolocarbazole-acridine combined products showed efficient delayed fluorescent behavior and a high quantum efficiency of 19.5% with a color coordinate of (0.15, 0.16) when they were evaluated as thermally activated delayed fluorescent emitters in deep blue fluorescent devices. This is the first demonstration of the use of electron-donating carbazole-derived moieties as efficient acceptor units of blue thermally activated delayed fluorescent emitters.
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Affiliation(s)
- Jeong-A Seo
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Yirang Im
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Si Hyun Han
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Chil Won Lee
- Department of Chemistry, Dankook University , Cheonan, Chungcheongnam-do 31116, Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
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38
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Huang J, Nie H, Zeng J, Zhuang Z, Gan S, Cai Y, Guo J, Su SJ, Zhao Z, Tang BZ. Highly Efficient Nondoped OLEDs with Negligible Efficiency Roll-Off Fabricated from Aggregation-Induced Delayed Fluorescence Luminogens. Angew Chem Int Ed Engl 2017; 56:12971-12976. [PMID: 28833917 DOI: 10.1002/anie.201706752] [Citation(s) in RCA: 263] [Impact Index Per Article: 37.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 08/11/2017] [Indexed: 11/10/2022]
Abstract
Purely organic emitters that can efficiently utilize triplet excitons are highly desired to cut the cost of organic light-emitting diodes (OLEDs), but most of them require complicated doping techniques for their fabrication and suffer from severe efficiency roll-off. Herein, we developed novel luminogens with weak emission and negligible delayed fluorescence in solution but strong emission with prominent delayed components upon aggregate formation, giving rise to aggregation-induced delayed fluorescence (AIDF). The concentration-caused emission quenching and exciton annihilation are well-suppressed, which leads to high emission efficiencies and efficient exciton utilization in neat films. Their nondoped OLEDs provide excellent electroluminescence efficiencies of 59.1 cd A-1 , 65.7 lm W-1 , and 18.4 %, and a negligible current efficiency roll-off of 1.2 % at 1000 cd m-2 . Exploring AIDF luminogens for the construction of nondoped OLEDs could be a promising strategy to advance device efficiency and stability.
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Affiliation(s)
- Jian Huang
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Han Nie
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Jiajie Zeng
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Zeyan Zhuang
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Shifeng Gan
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Yuanjing Cai
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Jingjing Guo
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Shi-Jian Su
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
| | - Ben Zhong Tang
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China.,Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
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39
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Byeon SY, Kim JH, Lee JY. CN-Modified Host Materials for Improved Efficiency and Lifetime in Blue Phosphorescent and Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes. ACS Appl Mater Interfaces 2017; 9:13339-13346. [PMID: 28362481 DOI: 10.1021/acsami.6b15502] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
CN-modified host materials, 9-(2-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-carbazole-3-carbonitrile (o-CzCN) and 9-(3-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-carbazole-3-carbonitrile (m-CzCN), which can improve the external quantum efficiency and lifetime of both blue phosphorescent and thermally activated delayed fluorescent (TADF) emitters were developed. A molecular design approach to stabilize the molecular structure and reduce the energy gap produced two high triplet energy host materials of o-CzCN and m-CzCN compatible with the phosphorescent and TADF emitters. The new host materials lowered operation voltage, increased quantum efficiency, and elongated lifetime of both phosphorescent and TADF devices.
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Affiliation(s)
- Sung Yong Byeon
- School of Chemical Engineering, Sungkyunkwan University , 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea
| | - Ji Han Kim
- School of Chemical Engineering, Sungkyunkwan University , 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University , 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea
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40
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Wang H, Jin WJ. Cocrystal assembled by 1,4-diiodotetrafluorobenzene and phenothiazine based on C-I...π/N/S halogen bond and other assisting interactions. Acta Crystallogr B Struct Sci Cryst Eng Mater 2017; 73:210-216. [PMID: 28362284 DOI: 10.1107/s2052520617002918] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 02/21/2017] [Indexed: 06/07/2023]
Abstract
The halogen-bonded cocrystal of 1,4-diiodotetrafluorobenzene (1,4-DITFB) with the butterfly-shape non-planar heterocyclic compound phenothiazine (PHT) was successfully assembled by the conventional solution-based method. X-ray single-crystal diffraction analysis reveals a 3:2 stoichiometric ratio for the cocrystal (1,4-DITFB/PHT), and the cocrystal structure is constructed via C-I...π, C-I...N and C-I...S halogen bonds as well as other assisting interactions (e.g. C-H...F/S hydrogen bond, C-H...H-C and C-F...F-C bonds). The small shift of the 1,4-DITFB vibrational band to lower frequencies in FT-IR and Raman spectroscopies provide evidence to confirm the existence of the halogen bond. In addition, the non-planarity of the PHT molecule in the cocrystal results in PHT emitting weak phosphorescence and relatively strong delayed fluorescence. Thus, a wide range of delayed fluorescence and weak phosphorescence could play a significant role in selecting a proper π-conjugated system to engineer functional cocrystal and luminescent materials by halogen bonds.
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Affiliation(s)
- Hui Wang
- College of Chemistry and Material Science, Shanxi Normal University, Linfen, Shanxi 041004, People's Republic of China
| | - Wei Jun Jin
- College of Chemistry, Beijing Normal University, Beijing, Beijing 100875, People's Republic of China
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41
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Liu XK, Chen W, Thachoth Chandran H, Qing J, Chen Z, Zhang XH, Lee CS. High-Performance, Simplified Fluorescence and Phosphorescence Hybrid White Organic Light-Emitting Devices Allowing Complete Triplet Harvesting. ACS Appl Mater Interfaces 2016; 8:26135-26142. [PMID: 27608272 DOI: 10.1021/acsami.6b07629] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Causes of efficiency limitation in common fluorescence and phosphorescence hybrid white organic light-emitting devices (WOLEDs) are discussed, and a new device architecture is proposed to address these issues. This architecture employs a fluorescent emitting layer (EML) of blue exciplex-forming cohost, which shows broad and strong thermally activated delayed fluorescence (TADF). Hybrid WOLEDs based on this architecture not only allow complete triplet harvesting for light generation but also can achieve white light emission with high color rending indexes (CRI) using only two colors. By using 26DCzPPy:PO-T2T as the blue fluorescent EML and 26DCzPPy:Ir complexes as the phosphorescent EML, we prepared a series of two-color WOLEDs with low turn-on voltages of 2.5-3.3 V, high forward-viewing EQEs of 12.7-19.3% and high CRIs of 67-77. These results suggest this new architecture would be an effective way to achieve high performance WOLEDs with simple structures.
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Affiliation(s)
- Xiao-Ke Liu
- Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong , Hong Kong SAR, P.R. China
| | - Wencheng Chen
- Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong , Hong Kong SAR, P.R. China
| | - Hrisheekesh Thachoth Chandran
- Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong , Hong Kong SAR, P.R. China
| | - Jian Qing
- Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong , Hong Kong SAR, P.R. China
| | - Zhan Chen
- Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong , Hong Kong SAR, P.R. China
| | - Xiao-Hong Zhang
- Functional Nano & Soft Materials Laboratory (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou, Jiangsu 215123, P.R. China
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Sciences, City University of Hong Kong , Hong Kong SAR, P.R. China
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42
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Lee DR, Choi JM, Lee CW, Lee JY. Ideal Molecular Design of Blue Thermally Activated Delayed Fluorescent Emitter for High Efficiency, Small Singlet-Triplet Energy Splitting, Low Efficiency Roll-Off, and Long Lifetime. ACS Appl Mater Interfaces 2016; 8:23190-23196. [PMID: 27529181 DOI: 10.1021/acsami.6b05877] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Highly efficient thermally activated delayed fluorescent (TADF) emitters, 5-(2-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5H-benzofuro[3,2-c]carbazole (oBFCzTrz), 5-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5H-benzofuro[3,2-c]carbazole (mBFCzTrz), and 5-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-5H-benzofuro[3,2-c]carbazole (pBFCzTrz), were synthesized to study the effects of ortho-, meta-, and para- linkages between donor and acceptor moieties. oBFCzTrz having ortho- linked donor and acceptor moieties showed smaller singlet-triplet energy gap, shorter excited state lifetime, and higher photoluminescence quantum yield than mBFCzTrz and pBFCzTrz which are interconnected by meta- and para- positions. The TADF device using oBFCzTrz as a blue emitter exhibited high external quantum efficiency over 20%, little efficiency roll-off, and long device lifetime.
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Affiliation(s)
- Dong Ryun Lee
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Jeong Min Choi
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Chil Won Lee
- Department of Polymer Science and Engineering, Dankook University , 126 Jukjeon-dong, Suji-gu, Yongin, Gyeonggi 448-701, Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
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43
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Furue R, Nishimoto T, Park IS, Lee J, Yasuda T. Aggregation-Induced Delayed Fluorescence Based on Donor/Acceptor-Tethered Janus Carborane Triads: Unique Photophysical Properties of Nondoped OLEDs. Angew Chem Int Ed Engl 2016; 55:7171-5. [PMID: 27145481 DOI: 10.1002/anie.201603232] [Citation(s) in RCA: 239] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Indexed: 11/09/2022]
Abstract
Luminescent materials consisting of boron clusters, such as carboranes, have attracted immense interest in recent years. In this study, luminescent organic-inorganic conjugated systems based on o-carboranes directly bonded to electron-donating and electron-accepting π-conjugated units were elaborated as novel optoelectronic materials. These o-carborane derivatives simultaneously possessed aggregation-induced emission (AIE) and thermally activated delayed fluorescence (TADF) capabilities, and showed strong yellow-to-red emissions with high photoluminescence quantum efficiencies of up to 97 % in their aggregated states or in solid neat films. Organic light-emitting diodes utilizing these o-carborane derivatives as a nondoped emission layer exhibited maximum external electroluminescence quantum efficiencies as high as 11 %, originating from TADF.
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Affiliation(s)
- Ryuhei Furue
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Takuro Nishimoto
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - In Seob Park
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Jiyoung Lee
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.,Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Takuma Yasuda
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. .,Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. .,Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
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44
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Jankus V, Aydemir M, Dias FB, Monkman AP. Generating Light from Upper Excited Triplet States: A Contribution to the Indirect Singlet Yield of a Polymer OLED, Helping to Exceed the 25% Singlet Exciton Limit. Adv Sci (Weinh) 2016; 3:1500221. [PMID: 27610333 PMCID: PMC4991292 DOI: 10.1002/advs.201500221] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 11/10/2015] [Indexed: 05/18/2023]
Abstract
The mechanisms by which light is generated in an organic light emitting diode have slowly been elucidated over the last ten years. The role of triplet annihilation has demonstrated how the "spin statistical limit" can be surpassed, but it cannot account for all light produced in the most efficient devices. Here, a further mechanism is demonstrated by which upper excited triplet states can also contribute to indirect singlet production and delayed fluorescence. Since in a device the population of these TN states is large, this indirect radiative decay channel can contribute a sizeable fraction of the total emission measured from a device. The role of intra- and interchain charge transfer states is critical in underpinning this mechanism.
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Affiliation(s)
- Vygintas Jankus
- OEM Research Group Physics Department University of Durham South Road Durham DH1 3LE UK
| | - Murat Aydemir
- OEM Research Group Physics Department University of Durham South Road Durham DH1 3LE UK
| | - Fernando B Dias
- OEM Research Group Physics Department University of Durham South Road Durham DH1 3LE UK
| | - Andrew P Monkman
- OEM Research Group Physics Department University of Durham South Road Durham DH1 3LE UK
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45
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Liu XK, Chen Z, Qing J, Zhang WJ, Wu B, Tam HL, Zhu F, Zhang XH, Lee CS. Remanagement of Singlet and Triplet Excitons in Single-Emissive-Layer Hybrid White Organic Light-Emitting Devices Using Thermally Activated Delayed Fluorescent Blue Exciplex. Adv Mater 2015; 27:7079-85. [PMID: 26436730 DOI: 10.1002/adma.201502897] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/28/2015] [Indexed: 05/15/2023]
Abstract
A high-performance hybrid white organic light-emitting device (WOLED) is demonstrated based on an efficient novel thermally activated delayed fluorescence (TADF) blue exciplex system. This device shows a low turn-on voltage of 2.5 V and maximum forward-viewing external quantum efficiency of 25.5%, which opens a new avenue for achieving high-performance hybrid WOLEDs with simple structures.
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Affiliation(s)
- Xiao-Ke Liu
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong SAR, P.R. China
| | - Zhan Chen
- Nano-Organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China
| | - Jian Qing
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong SAR, P.R. China
| | - Wen-Jun Zhang
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong SAR, P.R. China
| | - Bo Wu
- Department of Physics and Institute of Advanced Materials and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University, Hong Kong SAR, P.R. China
| | - Hoi Lam Tam
- Department of Physics and Institute of Advanced Materials and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University, Hong Kong SAR, P.R. China
| | - Furong Zhu
- Department of Physics and Institute of Advanced Materials and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University, Hong Kong SAR, P.R. China
| | - Xiao-Hong Zhang
- Nano-Organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China
- Functional Nano and Soft Materials Laboratory (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu, 215123, P.R. China
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Sciences, City University of Hong Kong, Hong Kong SAR, P.R. China
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46
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Lee DR, Kim M, Jeon SK, Hwang SH, Lee CW, Lee JY. Design strategy for 25% external quantum efficiency in green and blue thermally activated delayed fluorescent devices. Adv Mater 2015; 27:5861-5867. [PMID: 26308481 DOI: 10.1002/adma.201502053] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 06/25/2015] [Indexed: 06/04/2023]
Abstract
Carbazole- and triazine-derived thermally activated delayed fluorescent (TADF) emitters, with three donor units and an even distribution of the highest occupied molecular orbital, achieve high external quantum efficiencies of above 25% in blue and green TADF devices.
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Affiliation(s)
- Dong Ryun Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 440-746, South Korea
| | - Mounggon Kim
- Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701, South Korea
| | - Sang Kyu Jeon
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 440-746, South Korea
| | - Seok-Ho Hwang
- Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701, South Korea
| | - Chil Won Lee
- Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701, South Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 440-746, South Korea
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47
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Wang S, Yan X, Cheng Z, Zhang H, Liu Y, Wang Y. Highly Efficient Near-Infrared Delayed Fluorescence Organic Light Emitting Diodes Using a Phenanthrene-Based Charge-Transfer Compound. Angew Chem Int Ed Engl 2015; 54:13068-72. [PMID: 26480338 DOI: 10.1002/anie.201506687] [Citation(s) in RCA: 234] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Indexed: 11/06/2022]
Abstract
Significant efforts have been made to develop high-efficiency organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) emitters with blue, green, yellow, and orange-red colors. However, efficient TADF materials with colors ranging from red, to deep-red, to near-infrared (NIR) have been rarely reported owing to the difficulty in molecular design. Herein, we report the first NIR TADF molecule TPA-DCPP (TPA=triphenylamine; DCPP=2,3-dicyanopyrazino phenanthrene) which has a small singlet-triplet splitting (ΔEST ) of 0.13 eV. Its nondoped OLED device exhibits a maximum external quantum efficiency (EQE) of 2.1 % with a Commission International de L'Éclairage (CIE) coordinate of (0.70, 0.29). Moreover, an extremely high EQE of nearly 10 % with an emission band at λ=668 nm has been achieved in the doped device, which is comparable to the most-efficient deep-red/NIR phosphorescent OLEDs with similar electroluminescent spectra.
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Affiliation(s)
- Shipan Wang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China)
| | - Xianju Yan
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China)
| | - Zong Cheng
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China)
| | - Hongyu Zhang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China)
| | - Yu Liu
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China)
| | - Yue Wang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China).
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48
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Balestra GM, Aalders MCG, Specht PAC, Ince C, Mik EG. Oxygenation measurement by multi-wavelength oxygen-dependent phosphorescence and delayed fluorescence: catchment depth and application in intact heart. J Biophotonics 2015; 8:615-628. [PMID: 25250821 DOI: 10.1002/jbio.201400054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/11/2014] [Accepted: 08/18/2014] [Indexed: 06/03/2023]
Abstract
Oxygen delivery and metabolism represent key factors for organ function in health and disease. We describe the optical key characteristics of a technique to comprehensively measure oxygen tension (PO(2)) in myocardium, using oxygen-dependent quenching of phosphorescence and delayed fluorescence of porphyrins, by means of Monte Carlo simulations and ex vivo experiments. Oxyphor G2 (microvascular PO(2)) was excited at 442 nm and 632 nm and protoporphyrin IX (mitochondrial PO(2)) at 510 nm. This resulted in catchment depths of 161 (86) µm, 350 (307) µm and 262 (255) µm respectively, as estimated by Monte Carlo simulations and ex vivo experiments (brackets). The feasibility to detect changes in oxygenation within separate anatomical compartments is demonstrated in rat heart in vivo. Schematic of ex vivo measurements.
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Affiliation(s)
- Gianmarco M Balestra
- Department of Anesthesiology, Laboratory of Experimental Anesthesiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands
- Department of Medical Intensive Care, University Hospital Basel, Switzerland
- Department of Translational Physiology, Academic Medical Center, Amsterdam, The Netherlands
| | - Maurice C G Aalders
- Department of Biomedical Engineering and Physics, Academic Medical Center, Amsterdam, The Netherlands
| | - Patricia A C Specht
- Department of Anesthesiology, Laboratory of Experimental Anesthesiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Can Ince
- Department of Translational Physiology, Academic Medical Center, Amsterdam, The Netherlands
| | - Egbert G Mik
- Department of Anesthesiology, Laboratory of Experimental Anesthesiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands
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49
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Dias FB. Kinetics of thermal-assisted delayed fluorescence in blue organic emitters with large singlet-triplet energy gap. Philos Trans A Math Phys Eng Sci 2015; 373:rsta.2014.0447. [PMID: 25987577 DOI: 10.1098/rsta.2014.0447] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/09/2015] [Indexed: 06/04/2023]
Abstract
The kinetics of thermally activated delayed fluorescence (TADF) is investigated in dilute solutions of organic materials with application in blue light-emitting diodes (OLEDs). A method to accurately determine the energy barrier (ΔE(a)) and the rate of reverse intersystem crossing (kRisc) in TADF emitters is developed, and applied to investigate the triplet-harvesting mechanism in blue-emitting materials with large singlet-triplet energy gap (ΔE(ST)). In these materials, triplet-triplet annihilation (TTA) is the dominant mechanism for triplet harvesting; however, above a threshold temperature TADF is able to compete with TTA and give enhanced delayed fluorescence. Evidence is obtained for the interplay between the TTA and the TADF mechanisms in these materials.
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Affiliation(s)
- Fernando B Dias
- Department of Physics, University of Durham, Durham DH1 3LE, UK
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50
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Lee DR, Kim BS, Lee CW, Im Y, Yook KS, Hwang SH, Lee JY. Above 30% external quantum efficiency in green delayed fluorescent organic light-emitting diodes. ACS Appl Mater Interfaces 2015; 7:9625-9629. [PMID: 25924007 DOI: 10.1021/acsami.5b01220] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Highly efficient green thermally activated delayed fluorescent organic light-emitting diodes with an external quantum efficiency of 31.2% were investigated by using 3-(3-(carbazole-9-yl)phenyl) pyrido[3',2':4,5]furo[2,3-b]pyridine (3CzPFP) derived from carbazole and pyrido[3',2':4,5]furo[2,3-b]pyridine. The host material showed well-matched photoluminescence emission with absorption of the green dopant material, (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) and harvested all excitons of 4CzIPN. The 3CzPFP:4CzIPN film exhibited high photoluminescence quantum yield of 100%, and the green delayed fluorescence device employing the 3CzPFP host showed high maximum quantum efficiency of 31.2 ± 0.5% at 1% doping after optimization of the device structure.
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Affiliation(s)
- Dong Ryun Lee
- †Department of Polymer Science and Engineering, Dankook University, Gyeonggi-do 448-701, Korea
| | - Bo Seong Kim
- †Department of Polymer Science and Engineering, Dankook University, Gyeonggi-do 448-701, Korea
| | - Chil Won Lee
- †Department of Polymer Science and Engineering, Dankook University, Gyeonggi-do 448-701, Korea
| | - Yirang Im
- ‡School of Chemical Engineering, Sungkyunkwan University 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Kyoung Soo Yook
- ‡School of Chemical Engineering, Sungkyunkwan University 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
| | - Seok-Ho Hwang
- †Department of Polymer Science and Engineering, Dankook University, Gyeonggi-do 448-701, Korea
| | - Jun Yeob Lee
- ‡School of Chemical Engineering, Sungkyunkwan University 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea
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