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Gevers BR, Roduner E, Leuteritz A, Labuschagné FJWJ. Uncovering thermally activated purple-to-blue luminescence in Co-modified MgAl-layered double hydroxide. NANOSCALE 2024. [PMID: 38436416 DOI: 10.1039/d3nr05205b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/05/2024]
Abstract
Thermally activated blue-to-purple luminescence of Co-modified nano-sandrose MgAl-layered double hydroxides (LDHs) is concentration dependent, occurring only for MgCoAl-LDH with a molar metal cation concentration of 15% Co. Temperature sweep luminescence spectroscopy between 83 K and 298 K shows that the luminescence is strongest at room temperature, increasing with an activation energy of 1 kJ mol-1 between these temperatures. The luminescence occurs in a broad, but fine-structured band below the conduction band (CB) edge at 3.0 eV after excitation at 5.0 eV.
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Affiliation(s)
- Bianca R Gevers
- Department of Chemical Engineering, University of Pretoria, 0002 Pretoria, South Africa.
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Polymer Materials; Processing Technology, D-01069 Dresden, Germany
| | - Emil Roduner
- Department of Chemistry, University of Pretoria, 0002 Pretoria, South Africa
- Institute of Physical Chemistry, Universität Stuttgart, Stuttgart D-70569, Germany
| | - Andreas Leuteritz
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Polymer Materials; Processing Technology, D-01069 Dresden, Germany
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Tselekidou D, Papadopoulos K, Foris V, Kyriazopoulos V, Andrikopoulos KC, Andreopoulou AK, Kallitsis JK, Laskarakis A, Logothetidis S, Gioti M. A Comparative Study between Blended Polymers and Copolymers as Emitting Layers for Single-Layer White Organic Light-Emitting Diodes. MATERIALS (BASEL, SWITZERLAND) 2023; 17:76. [PMID: 38203932 PMCID: PMC10780062 DOI: 10.3390/ma17010076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/18/2023] [Accepted: 12/19/2023] [Indexed: 01/12/2024]
Abstract
Extensive research has been dedicated to the solution-processable white organic light-emitting diodes (WOLEDs), which can potentially influence future solid-state lighting and full-color flat-panel displays. The proposed strategy based on WOLEDs involves blending two or more emitting polymers or copolymerizing two or more emitting chromophores with different doping concentrations to produce white light emission from a single layer. Toward this direction, the development of blends was conducted using commercial blue poly(9,9-di-n-octylfluorenyl2,7-diyl) (PFO), green poly(9,9-dioctylfluorenealt-benzothiadiazole) (F8BT), and red spiro-copolymer (SPR) light-emitting materials, whereas the synthesized copolymers were based on different chromophores, namely distyryllanthracene, distyrylcarbazole, and distyrylbenzothiadiazole, as yellow, blue, and orange-red emitters, respectively. A comparative study between the two approaches was carried out to examine the main challenge for these doping systems, which is ensuring the proper balance of emissions from all the units to span the entire visible range. The emission characteristics of fabricated WOLEDs will be explored in terms of controlling the emission from each emitter, which depends on two possible mechanisms: energy transfer and carrier trapping. The aim of this work is to achieve pure white emission through the color mixing from different emitters based on different doping concentrations, as well as color stability during the device operation. According to these aspects, the WOLED devices based on the copolymers of two chromophores exhibit the most encouraging results regarding white color emission coordinates (0.28, 0.31) with a CRI value of 82.
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Affiliation(s)
- Despoina Tselekidou
- Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (K.P.); (A.L.); (S.L.)
| | - Kyparisis Papadopoulos
- Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (K.P.); (A.L.); (S.L.)
| | - Vasileios Foris
- Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (K.P.); (A.L.); (S.L.)
| | - Vasileios Kyriazopoulos
- Organic Electronic Technologies P.C. (OET), 20th KM Thessaloniki—Tagarades, GR-57001 Thermi, Greece;
| | - Konstantinos C. Andrikopoulos
- Department of Chemistry, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (K.C.A.); (A.K.A.); (J.K.K.)
| | - Aikaterini K. Andreopoulou
- Department of Chemistry, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (K.C.A.); (A.K.A.); (J.K.K.)
| | - Joannis K. Kallitsis
- Department of Chemistry, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (K.C.A.); (A.K.A.); (J.K.K.)
| | - Argiris Laskarakis
- Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (K.P.); (A.L.); (S.L.)
| | - Stergios Logothetidis
- Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (K.P.); (A.L.); (S.L.)
- Organic Electronic Technologies P.C. (OET), 20th KM Thessaloniki—Tagarades, GR-57001 Thermi, Greece;
| | - Maria Gioti
- Nanotechnology Lab LTFN, Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (K.P.); (A.L.); (S.L.)
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Chen L, Chang Y, Shi S, Wang S, Wang L. Solution-processed white OLEDs with power efficiency over 90 lm W -1 by triplet exciton management with a high triplet energy level interfacial exciplex host and a high reverse intersystem crossing rate blue TADF emitter. MATERIALS HORIZONS 2022; 9:1299-1308. [PMID: 35195631 DOI: 10.1039/d1mh02060a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Solution-processed white organic light-emitting diodes (WOLEDs) have shown much lower device efficiency than their vacuum-deposited counterparts, due to the lack of triplet exciton management in a single-emissive-layer device structure, which will induce triplet-triplet annihilation (TTA) and triplet-polaron annihilation (TPA). Here, two kinds of solution-processed WOLEDs, including thermally activated delayed fluorescence (TADF)/phosphorescence hybrid WOLEDs and all-TADF WOLEDs, with high power efficiency are developed by using a high triplet energy level (T1) interfacial exciplex as a host and a high reverse intersystem crossing (RISC) rate TADF emitter as a blue dopant for triplet exciton management. The interfacial exciplex host with high T1 can ensure that triplet excitons transfer from the host to the blue emitter, and the blue TADF emitter with high RISC rate (1.15 × 107 s-1) can rapidly upconvert triplet excitons to singlet ones to avoid TTA and TPA. The solution-processed TADF/phosphorescence hybrid and all-TADF WOLEDs exhibit maximum external quantum efficiencies of 31.1% and 27.3%, together with maximum power efficiencies of 93.5 and 70.4 lm W-1, respectively, which are the record efficiencies for solution-processed WOLEDs, and quite comparable to those of most vacuum-deposited counterparts.
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Affiliation(s)
- Liang Chen
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yufei Chang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Song Shi
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Shumeng Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
| | - Lixiang Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
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Barman D, Annadhasan M, Chandrasekar R, Iyer PK. Hot-exciton harvesting via through-space single-molecule based white-light emission and optical waveguides. Chem Sci 2022; 13:9004-9015. [PMID: 36091201 PMCID: PMC9365089 DOI: 10.1039/d2sc02172b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 07/02/2022] [Indexed: 11/21/2022] Open
Abstract
Through-space donor–alkyl bridge–acceptor (D–σ–A) luminogens are developed as new organic single-molecule white light emitters (OSMWLEs) involving multiple higher lying singlet (Sn) and triplet (Tm) states (hot-excitons). Experimental and theoretical results confirm the origin of white light emission due to the co-existence of prompt fluorescence from locally excited states, thermally activated delayed fluorescence (TADF), and fast/slow dual phosphorescence color mixing simultaneously. Notably, the fast phosphorescence was observed due to trace amounts of isomeric impurities from commercial carbazole, while H-/J-aggregation resulted in slow phosphorescence. Crystal structure-packing-property analysis revealed that the alkyl chain length induced supramolecular self-assembly greatly influenced the solid-state optical properties. Remarkably, the 1D-microrod crystals of OSMWLEs demonstrated the first examples of triplet harvesting waveguides by self-guiding the generated phosphorescence through light propagation along their longitudinal axis. This work thus highlights an uncommon design strategy to achieve multi-functional OSMWLEs with in-depth mechanistic insights and optical waveguiding applications making them a potentially new class of white emissive materials. Through-space donor–alkyl bridge–acceptor multifunctional organic single molecules that simultaneously displayed white light emission, thermally activated delayed fluorescence, room temperature dual phosphorescence and optical wave-guiding properties.![]()
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Affiliation(s)
- Debasish Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | - Mari Annadhasan
- School of Chemistry and Centre for Nanotechnology, University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad-500046, India
| | - Rajadurai Chandrasekar
- School of Chemistry and Centre for Nanotechnology, University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad-500046, India
| | - Parameswar Krishnan Iyer
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
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Ajantha J, Yuvaraj P, Karuppusamy M, Easwaramoorthi S. Single-Molecule White-Light-Emitting Starburst Donor-Acceptor Triphenylamine Derivatives and Their Application as Ratiometric Luminescent Molecular Thermometers. Chemistry 2021; 27:11319-11325. [PMID: 34043253 DOI: 10.1002/chem.202100748] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Indexed: 01/07/2023]
Abstract
White-light emission (WLE) from a single molecule is a highly desirable alternative to a complex mixture of complementary colour emitters, which suffers from poor stability and reproducibility for potential use in organic electronic devices and lighting applications. We report single-molecule WLE both in solution and thin films by judiciously controlled π-electron delocalisation between the triarylamine subchromophoric units. Triphenylamine (TPA) forms the central core, and the phenyl rings are substituted with the electron-deficient acceptor 3-ethylrhodanine (Rh) and electron-rich donors triphenylamine or carbazole. The enforced biphenyl configuration of the TPA core and the other donors renders the π-conjugation across the entire chromophore poor, thus the individual subchromophoric units retain their individual emission characteristics, which cover all three primary colour emissions, that is, red, green and blue (RGB). TPA-Rh units exhibit broad fluorescence in the green-red region originating from the local excited (LE) state and intramolecular charge transfer state (ICT), strongly influenced by the solvent, water, and temperature. Different fluorescence parameters, including spectral maxima, ratiometric changes in ICT emission at the expense of blue emission from terminal donor units, and changes in lifetime, have a linear relationship with temperature between 180-330 K, thus the molecules can function as a multiparameter luminescent molecular thermometer. A temperature coefficient of 0.19 K-1 in ratiometric fluorescence changes along with a spectral shift of 0.3 nm K-1 and their workability over the wide temperature makes these molecules promising materials for potential applications. At lower temperatures, individual subchromophoric properties subside because of the reduced dihedral angle of biphenyl, and fluorescence from the whole molecule becomes dominant.
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Affiliation(s)
- Joseph Ajantha
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
- University of Madras, Chepauk, Chennai, 600005, India
| | - Palani Yuvaraj
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
- University of Madras, Chepauk, Chennai, 600005, India
| | - Masiyappan Karuppusamy
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600020, India
| | - Shanmugam Easwaramoorthi
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
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Wang B, Wang H, Chen W, Wu P, Bu L, Zhang L, Wan L. Corrigendum to "Carbonized cotton fiber supported flexible organic lithium ion battery cathodes" [J. Colloid Interface Sci. 572 (2020) 1-8]. J Colloid Interface Sci 2021; 588:619-626. [PMID: 33256963 DOI: 10.1016/j.jcis.2020.11.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Carbonized cotton fibers (CCFs) were prepared by the carbonization of commercial cottons at 700, 800 and 900 °C. The following characterizations indicated that the properties of the obtained CCFs could be effectively tuned by the carbonization temperatures. Containing both high conductivity and high aspect ratio, the CCFs could be used as the conductive agents for the construction of the integrated organic cathodes in lithium ion batteries (LIBs). With the optimized ratio of CCF from 900 °C, the organic LIB cathodes showed a high specific capacity of 135 mA h g-1 at a current density of 0.05 A g-1 and an impressive cyclizing stability by keeping 90.5% of the highest capacity value after 500 cycles at 0.5 A g-1. The moderate mechanical stability of the CCF supported organic cathode enabled the further fabrication of flexible LIBs, which manifested stable performances at various bent states, confirming the potentials of CCFs in flexible energy storage devices.
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Affiliation(s)
- Bin Wang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Han Wang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China.
| | - Wenxin Chen
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Pengfei Wu
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Lehao Bu
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Long Zhang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Lingzi Wan
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
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Najare MS, Patil MK, Garbhagudi M, Yaseen M, Inamdar SR, Khazi IAM. Design, synthesis and characterization of π-conjugated 2,5-diphenylsubstituted-1,3,4-oxadiazole-based D-π-A-π’-D′ form of efficient deep blue functional materials: Photophysical properties and fluorescence “Turn-off” chemsensors approach. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115443] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Khammultri P, Kitisriworaphan W, Chasing P, Namuangruk S, Sudyoadsuk T, Promarak V. Efficient white light-emitting polymers from dual thermally activated delayed fluorescence chromophores for non-doped solution processed white electroluminescent devices. Polym Chem 2021. [DOI: 10.1039/d0py01541e] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Conjugated TADF copolymers comprised of two TADF molecules linked with carbazole exhibited stable pure white emission from non-doped OLEDs with CIE coordinates (0.32, 0.35), a maximum luminance efficiency of 9.13 cd A−1, and a maximum EQE of 4.17%.
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Affiliation(s)
- Praetip Khammultri
- Department of Materials Science and Engineering
- School of Molecular Science & Engineering
- Vidyasirimedhi Institute of Science and Technology
- Wangchan
- Thailand
| | - Wipaporn Kitisriworaphan
- School of Chemistry
- Institute of Science
- Suranaree University of Technology
- Nakhon Ratchasima 30000
- Thailand
| | - Pongsakorn Chasing
- Department of Materials Science and Engineering
- School of Molecular Science & Engineering
- Vidyasirimedhi Institute of Science and Technology
- Wangchan
- Thailand
| | - Supawadee Namuangruk
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency
- Pathum Thani
- Thailand
| | - Taweesak Sudyoadsuk
- Department of Materials Science and Engineering
- School of Molecular Science & Engineering
- Vidyasirimedhi Institute of Science and Technology
- Wangchan
- Thailand
| | - Vinich Promarak
- Department of Materials Science and Engineering
- School of Molecular Science & Engineering
- Vidyasirimedhi Institute of Science and Technology
- Wangchan
- Thailand
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Song B, Zhang R, Hu R, Chen X, Liu D, Guo J, Xu X, Qin A, Tang BZ. Site-Selective, Multistep Functionalizations of CO 2-Based Hyperbranched Poly(alkynoate)s toward Functional Polymetric Materials. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2000465. [PMID: 32995119 PMCID: PMC7507432 DOI: 10.1002/advs.202000465] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 05/23/2020] [Indexed: 05/05/2023]
Abstract
Hyperbranched polymers constructed from CO2 possess unique architectures and properties; however, they are difficult to prepare. In this work, CO2-based, hyperbranched poly(alkynoate)s (hb-PAs) with high molecular weights and degrees of branching are facilely prepared under atmospheric pressure in only 3 h. Because hb-PAs possess two types of ethynyl groups with different reactivities, they can undergo site-selective, three-step functionalizations with nearly 100% conversion in each step. Taking advantage of this unique feature, functional hb-PAs with versatile properties are constructed that could be selectively tailored to contain hydrophilic oligo(ethylene glycol) chains in their branched chains, on their periphery, or both via tandem polymerizations. Hyperbranched polyprodrug amphiphiles with high drug loading content (44.3 wt%) are also generated, along with an artificial light-harvesting system with high energy transfer efficiency (up to 92%) and white-light-emitting polymers. This work not only provides an efficient pathway to convert CO2 into hyperbranched polymers, but also offers an effective platform for site-selective multistep functionalizations toward functional polymeric materials.
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Affiliation(s)
- Bo Song
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Rongyuan Zhang
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
- Department of UrologyThe First Affiliated Hospital of Soochow University188 Shizi RDSuzhou215006China
| | - Rong Hu
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Xu Chen
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Dongming Liu
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Jiali Guo
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Xiaotian Xu
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Anjun Qin
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
| | - Ben Zhong Tang
- State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesCenter for Aggregation‐Induced EmissionSouth China University of TechnologyGuangzhou510640China
- Department of ChemistryHong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science & TechnologyClear Water BayKowloonHong KongChina
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Wang B, Wang H, Chen W, Wu P, Bu L, Zhang L, Wan L. Carbonized cotton fiber supported flexible organic lithium ion battery cathodes. J Colloid Interface Sci 2020; 572:1-8. [PMID: 32220761 DOI: 10.1016/j.jcis.2020.03.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 02/21/2020] [Accepted: 03/11/2020] [Indexed: 01/04/2023]
Abstract
Carbonized cotton fibers (CCFs) were prepared by the carbonization of commercial cottons at 700, 800 and 900 °C. The following characterizations indicated that the properties of the obtained CCFs could be effectively tuned by the carbonization temperatures. Containing both high conductivity and high aspect ratio, the CCFs could be used as the conductive agents for the construction of the integrated organic cathodes in lithium ion batteries (LIBs). With the optimized ratio of CCF from 900 °C, the organic LIB cathodes showed a high specific capacity of 135 mA h g-1 at a current density of 0.05 A g-1 and an impressive cyclizing stability by keeping 90.5% of the highest capacity value after 500 cycles at 0.5 A g-1. The good mechanical stability of the CCF supported organic cathode enabled the further fabrication of flexible LIBs, which manifested stable performances at various bent states, confirming the potentials of CCFs in flexible energy storage devices.
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Affiliation(s)
- Bin Wang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Han Wang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China.
| | - Wenxin Chen
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Pengfei Wu
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Lehao Bu
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Long Zhang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Lingzi Wan
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
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Barman D, Gogoi R, Narang K, Iyer PK. Recent Developments on Multi-Functional Metal-Free Mechanochromic Luminescence and Thermally Activated Delayed Fluorescence Organic Materials. Front Chem 2020; 8:483. [PMID: 32695743 PMCID: PMC7338664 DOI: 10.3389/fchem.2020.00483] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/11/2020] [Indexed: 12/12/2022] Open
Abstract
Metal-free organic compounds with highly ordered π-conjugated twisted skeletons are capable of generating brilliant multi-colored light. Additionally, the co-existence of numerous other multi-functional properties have endowed them with the potential to be a promising class of materials for several electronic and photonic applications and next-generation advanced luminescent material-based devices. This review highlights the recent developments made in this fascinating class of multi-property encompassing materials, involving a highly twisted donor-acceptor based single molecular platform with synchronized photophysical behavior such as thermally activated delayed fluorescence (TADF), mechanoresponsive (MR), room-temperature phosphorescence (RTP), and aggregation induced emission (AIE) with associated unique and inherently manifested structure-property relationship investigations. Furthermore, a brief summary of the optoelectronic behavior of TADF materials are also presented by correlating their performances in the organic light-emitting diodes (OLEDs) and corresponding EL devices. In addition to mechanochromic luminescence (MCL) with TADF behavior, new types of emitters are also being developed, with tunable color changes such as blue-green, yellow-orange, yellow-red, etc., with some emitters crossing the entire visible span to produce white OLEDs. These developments have enriched the library of fascinating organic materials in addition to providing new directions of multifunctional material design for solutions processed OLED and several other advanced devices.
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Affiliation(s)
- Debasish Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
| | - Rajdikshit Gogoi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
| | - Kavita Narang
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
| | - Parameswar Krishnan Iyer
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India.,Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, India
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