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Park JY, Kwon NY, Koh CW, Park SH, Kang MJ, Kwak H, Park CY, Chae WS, Hong CS, Park S, Cho MJ, Choi DH. Precision-Engineered Medium-Sized Molecular Host and Emitter for Ensuring Consistent Performance in Solution-Processed Narrowband OLEDs. ACS Appl Mater Interfaces 2024; 16:16553-16562. [PMID: 38570940 DOI: 10.1021/acsami.3c18848] [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] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
In this study, two novel multiple resonance (MR) emitters, DtCzBN and Cy-DtCzBN, were designed based on the well-known BCzBN structure and synthesized for narrowband solution-processed organic light-emitting diodes (OLEDs). Cy-DtCzBN possesses a dimeric V-shaped structure formed by coupling two individual DtCzBN units via a nonconjugated cyclohexane linker. When compared with DtCzBN, Cy-DtCzBN, as a medium-sized molecule, was found to maintain the optical and photophysical properties of the corresponding monomeric unit, DtCzBN, but exhibits high thermal stability, excellent solubility, and good film-forming ability. Additionally, solution-processed OLEDs were fabricated by using two sets of molecules: one set of small molecular hosts and emitters (i.e., mCP and DtCzBN) and the other set of medium-sized molecular hosts and emitters (i.e., Cy-mCP and Cy-DtCzBN). Notably, devices using medium-sized molecular hosts and emitters exhibited similar optical and photophysical properties but showed significantly improved reproducibility and thermal stability compared with those based on small molecular hosts and emitters. Our current study provides some insights into molecular design strategies for thermally stable hosts and emitters, which are highly suitable for solution-processed OLEDs.
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Affiliation(s)
- Jin Young Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chang Woo Koh
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ji Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Haeun Kwak
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chae Yeong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Weon-Sik Chae
- Daegu Center, Korea Basic Science Institute, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Chang Seop Hong
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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Kim A, Ahn Y, Li W, Park SH, Cho MJ, Choi DH, Yang H. Stretchable Semiconducting Polymers with Hydrogen-Bonding-Capable Conjugation Breakers: Synthesis and Application in Organic Thin-Film Transistors. ACS Appl Mater Interfaces 2023; 15:58663-58672. [PMID: 38064280 DOI: 10.1021/acsami.3c12057] [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] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Diketopyrrolopyrrole (DPP)-based conjugated copolymers are important organic semiconductors for applications in high-efficiency organic thin-film transistors (OTFTs). However, the direct application of these polymers with rigid backbones in stretchable devices has limitations. In this study, we designed and synthesized three kinds of DPPBT-based copolymers, DPPBT-A1, DPPBT-A3, and DPPBT-A5, which have amide-coupled alkylene conjugation breakers capable of hydrogen bonding. Linkers with different segment lengths were copolymerized with DPP and bithiophene (BT) backbone units. A DPP-based copolymer with alternating BT moieties, DPPBT, was synthesized as a reference fully conjugated copolymer. The synthesized polymers with freely rotational backbone linkers have sufficient flexibility to develop ordered phase domains, even in thin films, in comparison to the reference copolymer. However, the introduction of the conjugation breakers, which disconnect the intramolecular π-π overlapping, tends to decrease the hole mobility (μ) from 0.76 to 0.20 cm2 V-1 s-1 in the corresponding OTFT devices. The TFT fabricated using DPPBT-A3 showed a mobility of 0.50 cm2 V-1 s-1, and the mobility value did not show a significant change even when elongated by more than 50%. Therefore, the molecular design strategy of introducing amide-coupled alkylene conjugation breakers into conjugated polymer chains can contribute significantly to the development of high-mobility stretchable conjugated polymers in future.
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Affiliation(s)
- Aesun Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 02841, South Korea
| | - Yooseong Ahn
- Department of Chemical Engineering, Inha University, Incheon 22212, South Korea
| | - Wenhao Li
- Department of Chemical Engineering, Inha University, Incheon 22212, South Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 02841, South Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 02841, South Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 02841, South Korea
| | - Hoichang Yang
- Department of Chemical Engineering, Inha University, Incheon 22212, South Korea
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Jung SH, Park SH, Kwon NY, Park JY, Kang MJ, Koh CW, Cho MJ, Park S, Choi DH. Novel π-Extended Indolocarbazole-Based Deep-Blue Fluorescent Emitter with Remarkably Narrow Bandwidth for Solution-Processed Organic Light-Emitting Diodes. ACS Appl Mater Interfaces 2023; 15:56106-56115. [PMID: 37994594 DOI: 10.1021/acsami.3c11702] [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] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
In solution-processed organic light-emitting diodes (OLEDs), achieving high color purity and efficiency is as important as that in vacuum processes. Emitters suitable for solution processing must have excellent solubility in organic solvents, high molecular weight, and compatibility with the host materials. In this study, we synthesized a deep-blue emitter that satisfies the above conditions by introducing a 1,4-bis(indolo[3,2,1-jk]carbazol-2-yl)benzene-based planar emitting core (DICz) structure and four 3,6-di-tert-butyl-9-phenyl-9H-carbazole (tCz) peripheral units, namely, 4tCz-DICz. A comparative compound, 4Hex-DICz, incorporating hexyl phenyl groups was synthesized. In contrast to 4Hex-DICz, 4tCz-DICz exhibited exceptional solubility in organic solvents and superior film-forming properties attributed to the presence of tCz units. Additionally, in the film state, the effective encapsulation of the emitting core (DICz) by the tCz units in 4tCz-DICz helps prevent undesirable molecular aggregation. The solution-processed OLEDs employing the CH-2D1 film, doped with 5 wt % 4tCz-DICz as the emitting layer, exhibited a deep-blue emission at 424 nm, characterized by a narrow bandwidth of 22 nm, and achieved a maximum external quantum efficiency (EQE) of approximately 4.0%. In contrast, the 4Hex-DICz-based device demonstrated an EQE of 2.91%. Consequently, we have successfully demonstrated that the introduction of four bulky tCz units into the DICz core is a promising molecular design strategy for the development of soluble indolocarbazole-based emitters, especially those used in high-performance deep-blue fluorescent OLEDs.
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Affiliation(s)
- Sung Hoon Jung
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jin Young Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ji Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chang Woo Koh
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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Kim A, Kwon J, Cho MJ, Kim JS, Kim S. The Number of Positive Lymph Nodes as Prognostic Factor in ypN1 Breast Cancer with Neoadjuvant Chemotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e185-e186. [PMID: 37784813 DOI: 10.1016/j.ijrobp.2023.06.1043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) This study aimed to assess the ability of the number of positive lymph nodes (LNP) after neoadjuvant chemotherapy (NAC) to stratify prognosis even within the same ypN stage in breast cancer patients. MATERIALS/METHODS A 6,443 non-metastatic breast cancer patients with ypN1 disease after NAC following primary surgery were identified using the stage, stage evaluation field, treatment fields from Surveillance Epidemiology and End Results (SEER) database. Survival analysis was performed for overall survival (OS) using Kaplan-Meier plot and Cox proportional hazard models. RESULTS Of patients, 1,132(17.6%) had 3 positive lymph nodes (LNP3), 4,363 (67.7%) patients were T1/2 stage and 538 (8.35%) patients were downstage after treatment. LNP3 group had a significantly worse OS than LNP1/2 group (5yr OS, 74.2% vs. 80.9%, p <0.001). Similar results were observed in cause specific survival analysis (5yr OS, 79.8% vs. 85.2%, p <0.001). In subgroup analysis, there was a significant difference in OS between LNP1/2 and LNP3 group for HER2 or triple negative subtype, (p <0.001), T1/2 stage (p <0.001) and stable/downstage of N stage (p <0.001 and 0.019, respectively), but not for luminal A/B subtype and T3/4 (p = 0.126, 0.629 and 0.154, respectively). Regarding the number of examined lymph node (LNE), OS was significantly decreased in patients with LNE ≤5 in LNP3 group (p <0.001) but not in LNP1/2 group. In multivariable analysis, the prognostic significance of LNP3 remained (p <0.001) and the following factors were significantly related to the prolonged OS; Luminal A/B (p<0.001 and 0.001, respectively), T1/2 stage (p <0.001), N1 stage (p <0.001), LNE (≤5 vs. >5, p = 0.001) and receipt of radiotherapy (p = 0.012). Even when PS matching was performed, the OS of LNP was worse than that of LNP1/2. CONCLUSION LNP could more stratify the patients with ypN1 breast cancer after NAC. LNP3 is significantly associated with OS even after adjusting for other prognosticators. In particular, since there is a potential difference in the magnitude of the impact of LNP3 according to LNE, it is necessary to consider both of them together for decision-making.
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Affiliation(s)
- A Kim
- Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, Korea, Republic of (South) Korea
| | - J Kwon
- Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, Korea, Republic of (South) Korea; Department of Radiation Oncology, Chungnam National University College of Medicine, Daejeon, Korea, Republic of (South) Korea
| | - M J Cho
- Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, Korea, Republic of (South) Korea; Department of Radiation Oncology, Chungnam National University College of Medicine, Daejeon, Korea, Republic of (South) Korea
| | - J S Kim
- Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, Korea, Republic of (South) Korea; Department of Radiation Oncology, Chungnam National University College of Medicine, Daejeon, Korea, Republic of (South) Korea
| | - S Kim
- Department of Radiation Oncology, Chungnam National University Hospital, Daejeon, Korea, Republic of (South) Korea; Department of Radiation Oncology, Chungnam National University College of Medicine, Daejeon, Korea, Republic of (South) Korea
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Cho MJ, Kim CE, Shin YH, Kim JK, Pack CG. Influence of Chemical and Genetic Manipulations on Cellular Organelles Quantified by Label-Free Optical Diffraction Tomography. Anal Chem 2023; 95:13478-13487. [PMID: 37523497 DOI: 10.1021/acs.analchem.3c01349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Label-free optical diffraction tomography provides three-dimensional imaging of cells and organelles, along with their refractive index (RI) and volume. These physical parameters are valuable for quantitative and accurate analysis of the subcellular microenvironment and its connections to intracellular biological properties. In biological and biochemical cell analysis, various invasive cell manipulations are used, such as temperature change, chemical fixation, live cell staining with fluorescent dye, and gene overexpression of exogenous proteins. However, it is not fully understood how these various manipulations affect the physicochemical properties of different organelles. In this study, we investigated the impact of these manipulations on the cellular properties of single HeLa cells. We found that after cell fixation and an increase in temperature, the RI value of organelles, such as the nucleus and cytoplasm, significantly decreased overall. Interestingly, unlike the cell nuclei, cytoplasmic RI values were hardly detected after membrane permeation, indicating that only intracytoplasmic components were largely lost. Additionally, our findings revealed that the expression of GFP and GFP-tagged proteins significantly increased the RI values of organelles in living cells compared to the less effective RI changes observed with chemical fluorescence staining for cell organelles. The result demonstrates that distinct types of invasive manipulations can alter the microenvironment of organelles in different ways. Our study sheds new light on how chemical and genetic manipulations affect organelles.
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Affiliation(s)
- Min Ju Cho
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Chae-Eun Kim
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Yeon Hui Shin
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Jun Ki Kim
- Asan Institute for Life Sciences, Asan Medical Center, Seoul 05505, Republic of Korea
- Department of Biomedical Engineering, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Chan-Gi Pack
- Asan Institute for Life Sciences, Asan Medical Center, Seoul 05505, Republic of Korea
- Department of Biomedical Engineering, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
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Kwon NY, Park SH, Koh CW, Park JY, Kang MJ, Baek HI, Youn J, Park S, Han CW, Cho MJ, Choi DH. Rational Molecular Design Strategy for Host Materials in Thermally Activated Delayed Fluorescence-OLEDs Suitable for Solution Processing. ACS Appl Mater Interfaces 2023. [PMID: 37256769 DOI: 10.1021/acsami.3c01236] [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] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Herein, a novel core molecule for V-shaped host molecules was synthesized, wherein two carbazoles were directly linked to cyclohexane. Cy-mCP and Cy-mCBP hosts were also successfully prepared for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The Cy-mCP and Cy-mCBP molecules contained a cyclohexane linker directly linked to two small molecular hosts (mCP and mCBP), exhibiting twice the molecular weight while maintaining the basic properties of a single host molecule with improved film-forming ability and solubility in organic solvents. These host materials showed superior thermal stability and high glass transition temperatures compared to lower molecular weight hosts. Green TADF-OLEDs were prepared using the two host materials and 2,4,5,6-tetra(3,6-di-tert-butylcarbazol-9-yl)-1,3-dicyanobenzene (t4CzIPN) emitter, achieving device efficiencies similar to that of a low-molecular-weight host. However, after the incorporation of a V-shaped host, superior characteristics were observed in terms of the thermal stability and operational stability of the device. The synthesis of V-shaped molecules by directly linking two carbazoles to a cyclohexane linker is promising for the development of different hosts for solution-processable OLEDs.
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Affiliation(s)
- Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chang Woo Koh
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jin Young Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ji Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Heume Il Baek
- LG Display, E2 Block LG Science Park, 30, Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Republic of Korea
| | - Junho Youn
- LG Display, E2 Block LG Science Park, 30, Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chang Wook Han
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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Park SH, Kwon NY, Jung SH, Harit AK, Woo HY, Cho MJ, Choi DH. Enhanced Efficiency and Stability of Novel Pseudo-ternary Polymer Solar Cells Enabled by a Conjugated Donor Block Copolymer. ACS Appl Mater Interfaces 2023; 15:20266-20277. [PMID: 37043738 DOI: 10.1021/acsami.3c00815] [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] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
The recent breakthrough in power conversion efficiencies (PCEs) of polymer solar cells (PSCs) that contain an active layer of a ternary system has achieved values of 18-19%; this has sparked interest for further research. However, this system has difficulties in optimizing the composition and controlling the interaction between the three active materials. In this study, we investigated the use of a donor1 (D1)-donor2 (D2) conjugated block copolymer (CBP), PM6-b-TT, to replace the physical blend of two donors. PM6-b-TT, which exhibits an extended absorption range, was synthesized by covalently bonding PM6, a medium-band gap polymer, with PBDT-TT, a wide-band gap polymer. The blend films containing PM6-b-TT and Y6-BO acceptor, demonstrated excellent crystallinity and a film morphology favorable for PSCs. The corresponding pseudo-ternary PSC exhibited significantly higher PCE and thermal stability than the PM6:PBDT-TT-based ternary device. This study unambiguously demonstrates that the novel D1-D2 CBP strategy, combined with the conventional binary and ternary system advantages, is a promising material production strategy that can boost the performance of future PSCs.
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Affiliation(s)
- Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Sung Hoon Jung
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
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Je H, Cho MJ, Kwon NY, Park SH, Kang MJ, Baek HI, Youn J, Han CW, Choi DH. Universal Polymeric Hole Transporting Material for Solution-Processable Green and Blue Thermally Activated Delayed Fluorescence OLEDs. ACS Appl Mater Interfaces 2023; 15:9792-9799. [PMID: 36780202 DOI: 10.1021/acsami.2c23092] [Citation(s) in RCA: 2] [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: 06/18/2023]
Abstract
To obtain high-efficiency solution-processed organic light-emitting diodes (OLEDs), a hole transport material (HTM) capable of solution processing with excellent charge transport properties is required. In this study, a new vinyl polymer (PmCP) containing hole-transporting 1,3-di(9H-carbazol-9-yl)benzene (mCP) in the side chain was successfully synthesized via radical polymerization. PmCP showed good film-forming ability and thermal stability. Moreover, PmCP has a higher triplet energy value and hole mobility than poly(N-vinylcarbazole) (PVK) used as a reference HTM, which can be applied as a hole transport layer (HTL) in thermally activated delayed fluorescence (TADF) OLEDs, providing green and blue emissions. PmCP-based solution-processable TADF-OLEDs containing green- and blue-emitting layers were easily fabricated without damaging the lower HTL while using ethyl acetate as an orthogonal solvent. The corresponding OLEDs possess high external quantum efficiencies of 29.60% and 11.00% for the green- and blue-emitting devices, respectively. They show superior performances compared to PVK-based devices used as a reference. It was confirmed that PmCP as a solution-processable HTM can replace PVK and is universally applicable to both green- and blue-emitting devices.
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Affiliation(s)
- Hyeondoo Je
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ji Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Heume Il Baek
- LG Display, E2 Block LG Science Park 30, Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Korea
| | - Junho Youn
- LG Display, E2 Block LG Science Park 30, Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Korea
| | - Chang Wook Han
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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Je H, Cho S, Kwon NY, Lee DW, Cho MJ, Choi DH. Customized Orthogonal Solvent System with Various Hole-Transporting Polymers for Highly Reproducible Solution-Processable Organic Light-Emitting Diodes. ACS Appl Mater Interfaces 2022; 14:35969-35977. [PMID: 35894557 DOI: 10.1021/acsami.2c07659] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Recently, various hosts and emitters for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs) have been developed. However, a few studies have been conducted on hole transport materials (HTMs) with differentiated solubility characteristics for manufacturing multilayer OLEDs using a solution process. Here, three new hole transport (HT) styrene polymers, PICz, PPBCz, and PTPCz, were synthesized by radical polymerization. Each of the polymers exhibited increases in their highest occupied molecular orbital (HOMO) levels and better hole-transporting abilities than poly(9-vinylcarbazole) (PVK) as a reference HT polymer. Furthermore, the three HT polymers exhibited different solubilities in toluene. Therefore, it was not possible to use a toluene solution to prepare the emitting layer (EML). To overcome this problem, ethyl acetate (EA), in which the three HT polymers are insoluble, was used as an orthogonal solvent to prepare an EML solution. In EA-solution-processed green-emitting TADF-OLEDs, the three HT-polymer-based devices displayed somewhat low turn-on voltages of 2.8 V and high external quantum efficiencies (EQEs) of >23%. These values are superior to those of a device with a PVK-HT layer. In addition, the devices manufactured with the EA solution showed high-performance reproducibility owing to the stable formation of each layer. In this study, we removed the HTM solubility constraint by dramatically changing the solvent for preparing the EML solution and provided an efficient strategy for the fabrication of OLED devices via solution processes in the future.
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Affiliation(s)
- Hyeondoo Je
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Seunguk Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Won Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
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Kwon NY, Park SH, Lee Y, Kong GD, Chau HD, Yoon HJ, Woo HY, Hoang MH, Cho MJ, Choi DH. Uniform Silver Nanowire Patterned Electrode on Robust PEN Substrate Using Poly(2-hydroxyethyl methacrylate) Underlayer. ACS Appl Mater Interfaces 2022; 14:34909-34917. [PMID: 35839207 DOI: 10.1021/acsami.2c07063] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Silver nanowire (AgNW) electrodes are among the most essential flexible transparent electrodes (FTEs) emerging as promising alternatives to brittle indium tin oxide (ITO) electrodes. The polymer comprising the plastic substrate to which the AgNWs are applied must also satisfy the mechanical requirements of the final device and withstand the device processing conditions. However, AgNW-based FTEs have some limitations, such as poor adhesion to coated plastic substrates, surface roughness, and difficulty in patterning. This study demonstrates a new strategy for creating AgNW-based patterned flexible poly(ethylene 2,6-naphthalate) (PEN)-based electrodes with appreciable optical and electrical properties. Introducing poly(2-hydroxyethyl methacrylate) on the PEN substrate enhanced the adhesion between the substrate and AgNWs and improved the dispersibility of the AgNWs. Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and a small amount of 2,4-hexadiyne-1,6-diol as a photosensitizer were coated onto the AgNW layer to improve the surface roughness and achieve an effective electrode pattern. By varying the AgNW concentration, we could tune the density and thickness of the AgNWs to optimize the sheet resistance and transmittance. Optimized AgNWs with a sheet resistance of 22.6 Ω/□ and transmittance of 92.3% at 550 nm were achieved. A polymer solar cell (PSC) was fabricated to evaluate the characteristics of the device employing the flexible electrodes. This PSC showed not only a high power conversion efficiency of 11.20%, similar to that of ITO-based devices, but also excellent mechanical stability, which is difficult to achieve in ITO-based flexible devices.
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Affiliation(s)
- Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Yoonjoo Lee
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Gyu Don Kong
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Hong Diem Chau
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Hyo Jae Yoon
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Mai Ha Hoang
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 11072, Vietnam
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
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11
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Chau HD, Kataria M, Kwon NY, Park SH, Kim Y, Kang H, Harit AK, Woo HY, Yoon HJ, Park S, Cho MJ, Choi DH. Improved Photovoltaic Performance of Ternary All-Polymer Solar Cells by Incorporating a New Y6-based Polymer Acceptor and PC61BM. Macromol Res 2022. [DOI: 10.1007/s13233-022-0069-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Kwon NY, Kim Y, Kataria M, Park SH, Cho S, Harit AK, Woo HY, Cho MJ, Park S, Choi DH. Donor-σ-Acceptor Dyad-Based Polymers for Portable Sensors: Controlling Photoinduced Electron Transfer via Tuning the Frontier Molecular Orbital Energies of Acceptors. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Youngseo Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Meenal Kataria
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Seunguk Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
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13
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Morgenroth M, Scholz M, Cho MJ, Choi DH, Oum K, Lenzer T. Mapping the broadband circular dichroism of copolymer films with supramolecular chirality in time and space. Nat Commun 2022; 13:210. [PMID: 35017508 PMCID: PMC8752614 DOI: 10.1038/s41467-021-27886-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Accepted: 12/17/2021] [Indexed: 01/30/2023] Open
Abstract
Measurements of the electronic circular dichroism (CD) are highly sensitive to the absolute configuration and conformation of chiral molecules and supramolecular assemblies and have therefore found widespread application in the chemical and biological sciences. Here, we demonstrate an approach to simultaneously follow changes in the CD and absorption response of photoexcited systems over the ultraviolet-visible spectral range with 100 fs time resolution. We apply the concept to chiral polyfluorene copolymer thin films and track their electronic relaxation in detail. The transient CD signal stems from the supramolecular response of the system and provides information regarding the recovery of the electronic ground state. This allows for a quantification of singlet-singlet annihilation and charge-pair formation processes. Spatial mapping of chiral domains on femtosecond time scales with a resolution of 50 μm and diffraction-limited steady-state imaging of the circular dichroism and the circularly polarised luminescence (CPL) of the films is demonstrated.
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Affiliation(s)
- Marius Morgenroth
- Department Chemistry and Biology, Physical Chemistry 2, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068, Siegen, Germany
| | - Mirko Scholz
- Department Chemistry and Biology, Physical Chemistry 2, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068, Siegen, Germany
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Kawon Oum
- Department Chemistry and Biology, Physical Chemistry 2, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068, Siegen, Germany.
| | - Thomas Lenzer
- Department Chemistry and Biology, Physical Chemistry 2, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068, Siegen, Germany.
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Kwon NY, Park SH, Cho S, Lee DW, Harit AK, Woo HY, Cho MJ, Choi DH. Polymer solar cells made with photocrosslinkable conjugated donor–acceptor block copolymers: improvement in the thermal stability and morphology with a single-component active layer. Polym Chem 2022. [DOI: 10.1039/d2py00413e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New photocrosslinkable conjugated donor–acceptor block copolymer bearing oxetane side chains is synthesized by one-pot polymerization to improve the thermal and morphological properties.
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Affiliation(s)
- Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Seunguk Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Won Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
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15
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Cho S, Kwon NY, Kim CW, Lee H, Ha JM, Kim HJ, Woo HY, Park S, Cho MJ, Choi DH. High Efficiency Solution-Processed Green Thermally Activated Delayed Fluorescence OLEDs using Polymer-Small Molecule Mixed Host. Polym Chem 2022. [DOI: 10.1039/d1py01700d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Development of suitable host materials for application to an emitter is of significant importance for the high-efficiency organic light-emitting diodes (OLEDs). In this study, we successfully synthesized poly(9,9-diphenyl-10-(4-vinylbenzyl)-9,10-dihydroacridine) (P(Bn-DPAc)) as...
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16
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Kim YU, Kwon NY, Park SH, Kim CW, Chau HD, Hoang MH, Cho MJ, Choi DH. Patterned Sandwich-Type Silver Nanowire-Based Flexible Electrode by Photolithography. ACS Appl Mater Interfaces 2021; 13:61463-61472. [PMID: 34913342 DOI: 10.1021/acsami.1c19164] [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: 06/14/2023]
Abstract
Silver nanowires (AgNWs) are one of the important flexible electrode material candidates that can replace brittle indium tin oxide (ITO). In this work, we demonstrated novel patterned sandwich-type AgNW-based transparent electrodes easily prepared using the photolithography method for application in flexible devices. A cross-linked underlayer was introduced to increase the adhesion properties between a poly(ethylene terephthalate) substrate and AgNWs, and as a result, a uniform AgNW layer was easily deposited. Finally, the AgNW layer could be easily patterned by introducing a photocross-linkable upper layer without lift-off, dry transfer, and removal methods. A mixture of poly(sodium-4-styrene sulfonate) (PSS-Na+) and 2,4-hexadiyne-1,6-diol (HDD), which is a component of the upper layer, exhibited good cross-linking properties as well as excellent adhesion to the AgNW layer. Through the above method, it was possible to easily fabricate a patterned electrode with smooth surface morphology. Moreover, AgNW-based patterned electrodes exhibit good optical and electrical properties (Rs = 29.8 Ω/□, T550 nm = 94.6%), making them suitable for optoelectronic devices. Flexible polymer solar cells (PSCs) using patterned AgNW electrodes showed a high power conversion efficiency of over 10%, which is comparable to that of PSCs using rigid ITO electrodes. In addition, the high mechanical stability of AgNW-based PSCs was confirmed by bending experiments.
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Affiliation(s)
- Young Un Kim
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chai Won Kim
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hong Diem Chau
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Mai Ha Hoang
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 11072, Vietnam
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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Hwang J, Koh CW, Ha JM, Woo HY, Park S, Cho MJ, Choi DH. Aryl-Annulated [3,2- a] Carbazole-Based Deep-Blue Soluble Emitters for High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes with CIE y <0.1. ACS Appl Mater Interfaces 2021; 13:61454-61462. [PMID: 34913684 DOI: 10.1021/acsami.1c15659] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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
In this study, we demonstrated two deep-blue TADF emitters, BO-tCzPhICz and BO-tCzDICz, for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). They were synthesized by employing an organoboron acceptor and 9-(3,6-di-tert-butyl-9H-carbazol-9-yl)-5-phenyl-5,12-dihydroindolo[3,2-a]carbazole (tCzPhICz) and 12-(3,6-di-tert-butyl-9H-carbazol-9-yl)-15H-diindolo[2,3-b:1',2',3'-lm]carbazole (tCzDICz) as bulky aryl-annulated [3,2-a] carbazole donors, respectively. Both emitters showed sufficient solubility in organic solvents, narrow deep-blue emission, and small energy difference (ΔEST) between singlet and triplet states, which can be applied to solution-processable deep-blue TADF-OLEDs. Solution-processed OLEDs exploiting these TADF emitters displayed deep-blue electroluminescence with CIEy <0.1, and high external quantum efficiencies of 17.8 and 14.8% were observed for BO-tCzPhICz and BO-tCzDICz, respectively. The emitter bearing bulky ICz-based donating units shows highly promising potential for high-efficiency solution-processable deep-blue TADF-OLEDs.
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Affiliation(s)
- Jinhyo Hwang
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Chang Woo Koh
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jung Min Ha
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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18
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Ahn JS, Park SH, Kwon NY, Cho MJ, Paek SH, Choi DH. Physical Properties of Thermally Crosslinked Fluorinated Polyimide and Its Application to a Liquid Crystal Alignment Layer. Polymers (Basel) 2021; 13:3903. [PMID: 34833204 PMCID: PMC8621600 DOI: 10.3390/polym13223903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 10/05/2021] [Revised: 11/08/2021] [Accepted: 11/09/2021] [Indexed: 01/29/2023] Open
Abstract
This study demonstrated the use of a thermally crosslinked polyimide (PI) for the liquid crystal (LC) alignment layer of an LC display (LCD) cell. Polyamic acid was prepared using 4,4'-oxydianiline (ODA) and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA). The 6FDA-ODA-based polyimide (PI) prepared by the thermal cyclic dehydration of the polyamic acid (PAA) was soluble in various polar solvents. After forming a thin film by mixing trifunctional epoxide [4-(oxiran-2-ylmethoxy)-N,N-bis(oxiran-2-ylmethyl)aniline] with the 6FDA-ODA-based PAA, it was confirmed that thermal curing at -110 °C caused an epoxy ring opening reaction, which could result in the formation of a networked polyimide not soluble in tetrahydrofuran. The crosslinked PI film showed a higher rigidity than the neat PI films, as measured by the elastic modulus. Furthermore, based on a dynamic mechanical analysis of the neat PI and crosslinked PI films, the glass transition temperatures (Tgs) were 217 and 339 °C, respectively, which provided further evidence of the formation of crosslinking by the addition of the epoxy reagent. After mechanical rubbing using these two PI films, an LC cell was fabricated using an anisotropic PI film as an LC alignment film. LC cells with crosslinked PI layers showed a high voltage holding ratio and low residual direct current voltage. This suggests that the crosslinked PI has good potential for use as an LC alignment layer material in advanced LCD technologies that require high performance and reliability.
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Affiliation(s)
- Jong-Soo Ahn
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (J.-S.A.); (S.H.P.); (N.Y.K.)
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (J.-S.A.); (S.H.P.); (N.Y.K.)
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (J.-S.A.); (S.H.P.); (N.Y.K.)
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (J.-S.A.); (S.H.P.); (N.Y.K.)
| | - Sang-Hyon Paek
- Department of Chemical Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si 17104, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea; (J.-S.A.); (S.H.P.); (N.Y.K.)
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Lee DW, Hwang J, Kim HJ, Lee H, Ha JM, Woo HY, Park S, Cho MJ, Choi DH. Novel V-Shaped Bipolar Host Materials for Solution-Processed Thermally Activated Delayed Fluorescence OLEDs. ACS Appl Mater Interfaces 2021; 13:49076-49084. [PMID: 34628848 DOI: 10.1021/acsami.1c14098] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Three V-shaped host molecules with a cyclohexane linker were successfully synthesized for thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The unipolar host molecules, BBCzC and BTDC, contained two 9-phenyl-9H-3,9'-bicarbazole (PBCz) moieties and two 2,12-di-tert-butyl-7-phenyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (PDBNA) moieties, respectively. BCzTC, a bipolar host molecule, consisted of a donor unit, PBCz, and an acceptor unit, PDBNA, connected by a cyclohexane linker. Three host molecules showed good solubility in various organic solvents, making them suitable for solution processing. Among the solution-processed green TADF-OLEDs using three host molecules and a green TADF emitter, the one with BCzTC showed the highest external quantum efficiency of up to 30% with a high power efficiency of 71 lm W-1 and a current efficiency of 102 cd A-1. Compared with BBCzC and BTDC, BCzTC exhibited a relatively high photoluminescence quantum yield (PLQY), an excellent balance in hole and electron transport properties in the emitting layer, and more efficient energy transfer to the emitter, giving such an excellent device performance.
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Affiliation(s)
- Dong Won Lee
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jinhyo Hwang
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyoseong Lee
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jung Min Ha
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Science, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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20
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Cho MJ, Kim YJ, Kim MJ, Kim YS, Park E, Choi KH, Kang JY, Kim HO, Koong MK, Kim YS, Yoon TK, Ko JJ, Lee JH. P–205 Epothilone D as an actin cytoskeleton stabilizer improved mitochondria bioenergenesis and blastocyst formation of mouse preimplantation embryo. Hum Reprod 2021. [DOI: 10.1093/humrep/deab130.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Study question
What is primary factor of bioenergetics product activity between microtubule instability and the functional activity of mitochondria in embryo?
Summary answer
The actin cytoskeleton instability is presumably the primary cause for the bioenergenesis of mitochondrial function to the preimplantation embryo development.
What is known already
Mitochondria are cellular organelles dynamically moving and morphological changes. It provides for homeostatic energy to the cell. The dynamic property of the mitochondria is associated with the microtubule network in the cell. However, the stability of the microtubule was clearly identified for preimplantation embryo development.
Study design, size, duration
This study is designed to assess the ATP productivity of the mitochondria, and specifically to observe what its primary factor is in terms of providing microtubule stability in mammalian cells. Additionally, we investigated the relationship between blastocyst formation and actin cytoskeleton stabilization by EpD with 2-cell mice.
Participants/materials, setting, methods
We prepared the microtubule stability regulation model with the HEK293 cell line by using the microtubule stabilizer as an Epothilone D (EpD). Then we analyzed the metabolic activity of the cells through oxidative phosphorylation (OXP) ratios analysis. Also, we performed confocal live imaging to observe mitochondria morphology depending on the cells’ microtubule. Next, we treated EpD to 2-cell culture media for the analysis of blastocyst development ratios.
Main results and the role of chance
EpD significantly increased fusion form. Also, EpD enhance bioenergy ratios like OXP in the mitochondria and functional activity related marker, like mTOR compared with the control. These results suggest that microtubule stabilization enhances mitochondrial metabolism by increasing oxygen consumption. Also, EpD in 2-cell culture media led to a significant increase in the speed of development and 50% higher hatched out blastocyst formation ratios compared to the control group.
Limitations, reasons for caution
This study had limited animal experiments. For the next study, we are planning with an aim to improve the quality and development ratios of human embryos by EpD.
Wider implications of the findings: Microtubule stabilizer has a possibility to recover the mitochondria’s functional activity in the preimplantation embryo development. Mitochondrial functional activity along the actin cytoskeleton may play a pivotal role in determining the embryo quality and development ratios for archive pregnancy.
Trial registration number
non-clinical trials
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Affiliation(s)
- M J Cho
- CHA University, Biomedical Sciences, Seoul, Korea- South
| | - Y J Kim
- CHA Medical Group, Reproductive and Molecular Medicine, Seoul, Korea- South
| | - M J Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - E Park
- CHA Fertility Center Seoul Station, Embryology lab, Seoul, Korea- South
| | - K H Choi
- CHA Fertility Center Seoul Station, Embryology lab, Seoul, Korea- South
| | - J Y Kang
- CHA Fertility Center Seoul Station, Embryology lab, Seoul, Korea- South
| | - H O Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - M K Koong
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - Y S Kim
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - T K Yoon
- CHA Fertility Center Seoul Station, Clinic, Seoul, Korea- South
| | - J J Ko
- CHA University, Biomedical Sciences, Seoul, Korea- South
| | - J H Lee
- CHA fertility seoul center seoul sequare 3floor, Reproductive and Molecular Medicine., Seoul, Korea- South
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Kwon NY, Park SH, Kang H, Kim YU, Chau HD, Harit AK, Woo HY, Yoon HJ, Cho MJ, Choi DH. Improved Stability of All-Polymer Solar Cells Using Crosslinkable Donor and Acceptor Polymers Bearing Vinyl Moieties in the Side-Chains. ACS Appl Mater Interfaces 2021; 13:16754-16765. [PMID: 33793188 DOI: 10.1021/acsami.1c00960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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
Crosslinkable polymers have attracted tremendous attention in various fields of science and technology, owing to their potential utilization in applications requiring dimensional and morphological stability under thermal and mechanical stress. In this study, random terpolymers were successfully synthesized by introducing thiophene-based monomers bearing vinyl functional groups in the side-chain of the polymer donor (PBDBT-BV20) and polymer acceptor (N2200-TV10) structures. The physical properties of the blend films of PBDBT-BV20 and N2200-TV10 before and after thermal crosslinking were extensively investigated and compared to those of the homogeneous individual polymer films. The results revealed that a network polymer with donor and acceptor polymer chains, which can lock the internal morphology, could be achieved by inducing crosslinking between the vinyl groups in the mixed state of PBDBT-BV20 and N2200-TV10. In addition, the power conversion efficiency (PCE) of the polymer solar cells (PSCs) containing the blend films that were crosslinked by a two-step thermal annealing process was improved. The enhanced PCE could be attributed to the individual crystallization of PBDBT-BV20 and N2200-TV10 in the blend phase at 120 °C and then thermal crosslinking at 140 °C. In addition, the PSCs with the crosslinked blend film exhibited an excellent shelf-life of over 1200 h and a thermally stable PCE. Furthermore, the crosslinked blend film exhibited excellent mechanical stability under bending stress in flexible PSCs using plastic substrates.
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Affiliation(s)
- Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Hungu Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Young Un Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Hong Diem Chau
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Hyo Jae Yoon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
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22
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Chau HD, Kwon NY, Park SH, Hwang J, Kataria M, Harit AK, Woo HY, Cho MJ, Choi DH. Complementary absorbing ternary blend containing structural isomeric donor polymers for improving the performance of PC61BM-based indoor photovoltaics. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123606] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Park SH, Kwon NY, Kim HJ, Cho E, Kang H, Harit AK, Woo HY, Yoon HJ, Cho MJ, Choi DH. Nonhalogenated Solvent-Processed High-Performance Indoor Photovoltaics Made of New Conjugated Terpolymers with Optimized Monomer Compositions. ACS Appl Mater Interfaces 2021; 13:13487-13498. [PMID: 33710873 DOI: 10.1021/acsami.0c22946] [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
Conjugated random terpolymers, PJ-25, PJ-50, and PJ-75 were successfully synthesized from three different monomers. Fluorine-substituted benzotriazole (2F-BTA) was incorporated into 4,8-bis(4-chlorothiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene (BDT-T-Cl) and a 1,3-bis(4-(2-ethylhexyl)thiophen-2-yl)-5,7-bis(2-alkyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD)-based alternating copolymer PM7 as a third monomeric unit. The solubility of the random terpolymers in nonhalogenated solvents increased with the number of 2F-BTA units in PM7. The random terpolymers were mixed with 3,9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene (IT-4F) to fabricate organic photovoltaic (OPV) cells. Among the three terpolymers and two related binary copolymers (e.g., PM7 and J52-Cl), outdoor photovoltaic (PV) cells (AM 1.5G) based on the PJ-50:IT-4F blend showed a high power conversion efficiency (PCE) of 11.34%. In addition, PJ-50 was employed as a donor in indoor PV (IPV) cells and was blended with nonfullerene acceptors, which have different absorption ranges. Among them, the PJ-50:IT-4F-based IPV device had the highest PCE of 17.41% with a Jsc of 54.75 μA cm-2 and an FF of 0.77 under 160 μW cm-2 light-emitting diode (LED) light. The terpolymer introduced in this study can be regarded as a promising material for the fabrication of outdoor PV and IPV cells with excellent performance involving the use of an eco-friendly solvent.
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Affiliation(s)
- Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Eunbin Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Hungu Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Hyo Jae Yoon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea
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24
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Kim YU, Park SH, Nhan NT, Hoang MH, Cho MJ, Choi DH. Optimal Design of PEDOT:PSS Polymer-Based Silver Nanowire Electrodes for Realization of Flexible Polymer Solar Cells. Macromol Res 2021. [DOI: 10.1007/s13233-021-9005-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Lee JH, Hwang J, Kim CW, Harit AK, Woo HY, Kim HJ, Kim YW, Choi DH, Cho MJ, Choi DH. New hole transport styrene polymers bearing highly π-extended conjugated side-chain moieties for high-performance solution-processable thermally activated delayed fluorescence OLEDs. Polym Chem 2021. [DOI: 10.1039/d1py00026h] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New polystyrene-based polymers with high π-extended hole transport pendants were synthesized to obtain a low turn-on voltage and high efficiency in solution-processed green TADF-OLEDs.
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Affiliation(s)
- Ji Hye Lee
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | - Jinhyo Hwang
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | - Chai Won Kim
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | - Amit Kumar Harit
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | - Han Young Woo
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | - Hyung Jong Kim
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | | | | | - Min Ju Cho
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seongbuk-gu
- Republic of Korea
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26
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Kim CW, Lee JH, Cho S, Kim HJ, Hwang J, Kim YW, Choi DH, Cho MJ, Lee K, Choi DH. Novel carbazole-acridine-based hole transport polymer for low turn-on voltage of green quantum dot light-emitting diodes. Polym Chem 2021. [DOI: 10.1039/d1py00497b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We synthesized a novel hole transporting polymer (P-CzAc) for solution-processable green QD-LEDs. Compared to PVK, the P-CzAz-based device showed higher device performance.
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Affiliation(s)
- Chai Won Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Ji Hye Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Seunguk Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Jinhyo Hwang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Yong Woo Kim
- LT Materials, 113-19, Dangha-Ro, Namsa-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 17118, Republic of Korea
| | - Dae Hyuk Choi
- LT Materials, 113-19, Dangha-Ro, Namsa-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 17118, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Kwangyeol Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
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27
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Yoon J, Kim SK, Kim HJ, Choi S, Jung SW, Lee H, Kim JY, Yoon DW, Han CW, Chae WS, Kwon JH, Cho MJ, Choi DH. Asymmetric Host Molecule Bearing Pyridine Core for Highly Efficient Blue Thermally Activated Delayed Fluorescence OLEDs. Chemistry 2020; 26:16383-16391. [PMID: 32686232 DOI: 10.1002/chem.202002655] [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: 06/01/2020] [Revised: 07/16/2020] [Indexed: 01/12/2023]
Abstract
In this study, two host materials, pCzBzbCz and pCzPybCz, are synthesized to achieve a high efficiency and long lifetime of blue thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The molecular design strategy involves the introduction of a pyridine group into the core structure of pCzPybCz as an electron-withdrawing unit, and an electron-donating phenyl group into the structure of pCzBzbCz. These host materials demonstrate good thermal stability and high triplet energy (T1 =3.07 eV for pCzBzbCz and 3.06 eV for pCzPybCz) for the fabrication of blue TADF-OLEDs. In particular, pCzPybCz-based OLED devices demonstrate an external quantum efficiency (EQE) of 22.7 % and an operational lifetime of 24 h (LT90 , time to attain 90 % of initial luminance) at an initial luminance of 1000 cd m-2 . This superior lifetime could be explained by the C-N bond dissociation energy (BDE) in the host molecular structure. Furthermore, a mixed-host system using the electron-deficient 2,4-bis(dibenzo[b,d]furan-2-yl)-6-phenyl-1,3,5-triazine (DDBFT) is proposed to inhibit the formation of the anion state of our host materials. In short, the device operational lifetime is further improved by applying DDBFT. The carbazole-based asymmetric host molecule containing a pyridine core realizes a high-efficiency blue TADF-OLED showing a positive effect on the operating lifetime, and can provide useful strategies for designing new host materials.
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Affiliation(s)
- Jiwon Yoon
- Department of Chemistry, Research Institute for Natural Sciences, Institution Korea University, 145, Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
| | - Seong Keun Kim
- Department of Information Display, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences, Institution Korea University, 145, Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
| | - Suna Choi
- Department of Chemistry, Research Institute for Natural Sciences, Institution Korea University, 145, Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
| | - Sang Won Jung
- Department of Information Display, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea
| | - Hyuna Lee
- Department of Information Display, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea
| | - Jun Yun Kim
- LG Display, Co., Ltd., LG Science Park, 30, Magokjungang 10-ro, Gangseo-gu, Seoul, 07796, Republic of Korea
| | - Dae-Wi Yoon
- LG Display, Co., Ltd., LG Science Park, 30, Magokjungang 10-ro, Gangseo-gu, Seoul, 07796, Republic of Korea
| | - Chang Wook Han
- LG Display, Co., Ltd., LG Science Park, 30, Magokjungang 10-ro, Gangseo-gu, Seoul, 07796, Republic of Korea
| | - Weon-Sik Chae
- Daegu Center, Korea Basic Science Institute, 80 Daehakro, Bukgu, Daegu, 41566, Republic of Korea
| | - Jang Hyuk Kwon
- Department of Information Display, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Institution Korea University, 145, Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Institution Korea University, 145, Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
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28
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Kim Y, Kwon NY, Park SH, Cho MJ, Choi DH, Park S. Dynamics of Photoinduced Energy Transfer in Fully and Partially Conjugated Polymers Bearing π-Extended Donor and Acceptor Monomers. Front Chem 2020; 8:605403. [PMID: 33251187 PMCID: PMC7674937 DOI: 10.3389/fchem.2020.605403] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 10/19/2020] [Indexed: 11/17/2022] Open
Abstract
The photophysical properties of donor (D)-acceptor (A) polymers were studied by designing two types of polymers, (D-σ-A)n and (D-π-A)n, with non-conjugated alkyl (sp3) and π-conjugated (sp2) linkers using π-extended donor and acceptor monomers that exhibit planar A-D-A structures. The non-conjugated alkyl linker provides structural flexibility to the (D-σ-A)n polymers, while the π-conjugated linker retains the rigid structure of the (D-π-A)n polymers. Photoinduced energy transfer occurs from the large donor to acceptor units in both polymers. However, the photoinduced energy transfer dynamics are found to be dependent on the conformation of the polymers, where the difference is dictated by the types of linkers between the donor and acceptor units. In solution, intramolecular energy transfer is relatively favorable for the (D-σ-A)n polymers with flexible linkers that allow the donor and acceptor units to be proximally located in the polymers. On the other hand, intermolecular (or interchain) energy transfer is dominant in the two polymer films because the π-extended donor and acceptor units in polymers are closely packed. The structural flexibility of the linkers between the donor and acceptor repeating units in the polymers affects the efficiency of energy transfer between the donor and acceptor units and the overall photophysical properties of the polymers.
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Affiliation(s)
- Youngseo Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Na Yeon Kwon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Su Hong Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
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29
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Godumala M, Hwang J, Kang H, Jeong JE, Harit AK, Cho MJ, Woo HY, Park S, Choi DH. High-Performance, Solution-Processable Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes Realized via the Adjustment of the Composition of the Organoboron Acceptor Monomer in Copolymer Host Materials. ACS Appl Mater Interfaces 2020; 12:35300-35310. [PMID: 32654477 DOI: 10.1021/acsami.0c10293] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Organic polymers that exhibit features pertinent to functioning as host materials for thermally activated delayed fluorescence (TADF) emitters have considerable potential in solution-processable organic light-emitting diodes (OLEDs), allowing simple, low-cost, and large-area applications. In particular, polymer hosts have superior characteristics, including facile functionality to introduce various electron donor and acceptor entities, the ability to uniformly disperse and contain small molecular dopants, and the ability to produce more smooth and homogeneous films, compared to those of their small-molecule counterparts. This manuscript describes the design and development of three new styrene-based copolymers (ABP91, ABP73, and ABP55) bearing diphenylacridine as the electron donor and 2,12-di-tert-butyl-7-phenyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene as the electron acceptor. In particular, ABP91, ABP73, and ABP55 were synthesized via variations in the ratio of donor to acceptor monomers to substantiate their influence in OLED applications. With the ability of the styrene backbone of interrupting the direct electronic coupling between the adjacent electron donor and acceptor entities through non-conjugated linkages, high triplet energy can be inherited by the resulting polymers (>2.70 eV). Furthermore, these materials manifest thermal robustness through high decomposition temperatures (between 348 and 366 °C) and high glass transition temperatures (between 234 and 277 °C). Consequently, solution-processable OLEDs fabricated using the newly synthesized copolymers as host materials and the familiar t4CzIPN as a green-emissive TADF dopant deliver state-of-the-art performance with maximum external quantum efficiencies of 21.8, 22.2, and 19.7% for ABP91, ABP73, and ABP55, respectively. To our knowledge, this is, to date, the best performance reported when organic polymers are used as host materials in solution-processable TADF OLEDs. The pragmatic outcomes obtained in this study can provide useful insights into the structure-property relationship to the OLED community for the further development of efficient polymer hosts for use in solution-processable TADF OLEDs.
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Affiliation(s)
- Mallesham Godumala
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jinhyo Hwang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyunchul Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Ji-Eun Jeong
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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30
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Hwang J, Lee C, Jeong JE, Kim CY, Woo HY, Park S, Cho MJ, Choi DH. Rational Design of Carbazole- and Carboline-Based Polymeric Host Materials for Realizing High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diode. ACS Appl Mater Interfaces 2020; 12:8485-8494. [PMID: 31990169 DOI: 10.1021/acsami.9b20279] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Recently, various host materials have been developed for solution-processed thermally activated delayed fluorescent organic light-emitting diodes (TADF-OLEDs). Compared with small-molecule hosts, polymeric hosts are advantageous for inducing a uniform distribution and segregation of dopant molecules in the emissive layer without undesired large-scale phase separation. In this study, new polymer hosts were demonstrated, in which a bipolar conjugative moiety consisting of a carbazole (Cz) donor and an α-carboline (α-Cb) acceptor was bound to the polystyrene backbone through a non-conjugated linker. They exhibited high triplet energies of >2.8 eV, and their emission spectra overlapped with the absorption spectrum of a green TADF emitter, which allowed facile energy transfer from the polymeric host to the small-molecule dopants. High device performance was observed, with external quantum efficiencies (EQEs) of 13.65, 17.09, and 17.48% for solution-processed green TADF-OLEDs using PSCzCz, PSCzCb, and PSCbCz, respectively, as hosts for the EML. The EQEs of bipolar host (PSCzCb and PSCbCz)-based devices were higher than those of unipolar host (poly(N-vinylcarbazole) and PSCzCz)-based devices owing to the well-balanced charge-carrier transport. According to these results, the polymeric host bearing a bipolar Cz and α-Cb coupled moiety is a promising material for solution-processable TADF-OLEDs.
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Affiliation(s)
- Jinhyo Hwang
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Chiho Lee
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Ji-Eun Jeong
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Chae Yeong Kim
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
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31
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Godumala M, Yoon J, Park SY, Lee C, Kim Y, Jeong JE, Park S, Woo HY, Cho MJ, Choi DH. 5H-Benzo[d]Benzo[4,5]Imidazo[2,1-b][1,3]Thiazine as a Novel Electron-Acceptor Cored High Triplet Energy Bipolar Host Material for Efficient Solution-Processable Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes. Front Chem 2020; 8:61. [PMID: 32117885 PMCID: PMC7020745 DOI: 10.3389/fchem.2020.00061] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 12/09/2019] [Accepted: 01/20/2020] [Indexed: 11/13/2022] Open
Abstract
Organic entities that can transport electrons are seldom available to develop adequate bipolar host materials applicable for solution-processable thermally activated delayed fluorescence (TADF)-organic light-emitting diodes (OLEDs). Therefore, the introduction of new electron-affine entities that plausibly demonstrate high triplet energy (E T) is of urgent need. In this contribution, we introduced benzimidazo[1,2-a][3,1]benzothiazine (BBIT) as a novel electron-affine entity and developed two new bipolar host materials, CzBBIT and 2CzBBIT. Both host materials exhibit high E T of 3.0 eV, superior thermal robustness with the thermal decomposition temperature of up to 392°C, a glass transition temperature of up to 161°C, and high solubility in common organic solvents. Consequently, the solution-processable OLEDs fabricated using a recognized IAcTr-out as the green TADF emitter doped into CzBBIT as the host, realized a maximum external quantum efficiency (EQE) of 23.3%, while the 2CzBBIT:IAcTr-out blend film-based device displayed an EQE of 18.7%. These outcomes corroborated that this work could shed light on the scientific community on the design of new electron-affine entities to establish the effective use of bipolar host materials toward proficient solution-processable TADF-OLEDs.
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Affiliation(s)
- Mallesham Godumala
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Jiwon Yoon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Seo Yeon Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Chiho Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Youngseo Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Ji-Eun Jeong
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul, South Korea
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Park SH, Kim Y, Kwon NY, Lee YW, Woo HY, Chae W, Park S, Cho MJ, Choi DH. Significantly Improved Morphology and Efficiency of Nonhalogenated Solvent-Processed Solar Cells Derived from a Conjugated Donor-Acceptor Block Copolymer. Adv Sci (Weinh) 2020; 7:1902470. [PMID: 32099759 PMCID: PMC7029657 DOI: 10.1002/advs.201902470] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/30/2019] [Indexed: 06/08/2023]
Abstract
A highly crystalline conjugated donor (D)-acceptor (A) block copolymer (PBDT2T-b-N2200) that has good solubility in nonhalogenated solvents is successfully synthesized. PBDT2T-b-N2200 shows a broad complementary absorption behavior owing to a wide-band gap donor (PBDT2T) present as a D-block and a narrow-band gap acceptor (N2200) present as an A-block. Polymer solar cells (PSCs) with conjugated block copolymer (CBCP) are fabricated using a toluene solution and PSC created with an annealed film showing the highest power conversion efficiency of 6.43%, which is 2.4 times higher than that made with an annealed blend film of PBDT2T and N2200. Compared to the blend film, the PBDT2T-b-N2200 film exhibits a highly improved surface and internal morphology, as well as a faster photoluminescence decay lifetime, indicating a more efficient photoinduced electron transfer. In addition, the PBDT2T-b-N2200 film shows high crystallinity through an effective self-assembly of each block during thermal annealing and a predominant face-on chain orientation favorable to a vertical-type PSC. Moreover, the CBCP-based PSCs exhibit an excellent shelf-life time of over 1020 h owing to their morphological stability. From these results, a D-A block copolymer system is one of the efficient strategies to improve miscibility and morphological stability in all polymer blend systems.
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Affiliation(s)
- Su Hong Park
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Youngseo Kim
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Na Yeon Kwon
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Young Woong Lee
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Han Young Woo
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Weon‐Sik Chae
- Daegu CenterKorea Basic Science Institute80 Daehakro, BukguDaegu41566South Korea
| | - Sungnam Park
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Min Ju Cho
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
| | - Dong Hoon Choi
- Department of ChemistryResearch Institute for Natural SciencesKorea University145 Anam‐Ro, Sungbuk‐guSeoul02841South Korea
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Scholz M, Morgenroth M, Cho MJ, Choi DH, Lenzer T, Oum K. Coherent acoustic phonon dynamics in chiral copolymers. Struct Dyn 2019; 6:064502. [PMID: 31893213 PMCID: PMC6927817 DOI: 10.1063/1.5124438] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
Coherent phonon oscillations in the UV-Vis transient absorption and circular dichroism response of two chiral polyfluorene-based copolymer thin films are investigated. A slow oscillation in the hundred picosecond regime indicates the propagation of a longitudinal acoustic phonon with a frequency in the gigahertz range through cholesteric films of PFPh and PFBT, which allow for the optical determination of the longitudinal sound velocity in these polymers, with values of (2550 ± 140) and (2490 ± 150) m s-1, respectively. The oscillation is induced by a strain wave, resulting in a pressure-induced periodic shift of the electronic absorption bands, as extracted from a Fourier analysis of the transient spectra. The acoustic phonon oscillation is also clearly detected in the transient circular dichroism (TrCD) response of PFPh, indicating a transient pressure-induced shift of the CD spectrum and possibly also phonon-induced chirality changes via pitch length modulation of the cholesteric helical polymer stack.
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Affiliation(s)
- Mirko Scholz
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Marius Morgenroth
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, South Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, South Korea
| | - Thomas Lenzer
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Kawon Oum
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
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Godumala M, Yoon J, Lee C, Jeong JE, Park S, Woo HY, Cho MJ, Choi DH. Chromenopyrazole-based bipolar host materials for solution-processable thermally activated delayed fluorescence OLEDs exhibiting high efficiency and low roll-off. Chem Commun (Camb) 2019; 55:12952-12955. [PMID: 31602441 DOI: 10.1039/c9cc05983k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
This study reports the design, synthesis, and characterization of two new bipolar host materials, DCzCP and TCzCP. Both materials were implemented as hosts by doping a known green thermally activated delayed fluorescent (TADF) emitter (t4CzIPN) in solution-processable OLEDs. DCzCP-based devices afford the best performance with the maximum external quantum efficiency (EQE) of 21.2%. Notably, the EQE was maintained at 20.7% and 19.7% at a practical luminance of 500 cd m-2 and 1000 cd m-2, respectively, demonstrating very small roll-off.
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Affiliation(s)
- Mallesham Godumala
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Jiwon Yoon
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Chiho Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Ji-Eun Jeong
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
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Scholz M, Morgenroth M, Cho MJ, Choi DH, Oum K, Lenzer T. Ultrafast Broadband Transient Absorption and Circular Dichroism Reveal Relaxation of a Chiral Copolymer. J Phys Chem Lett 2019; 10:5160-5166. [PMID: 31436421 DOI: 10.1021/acs.jpclett.9b02061] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We present a study of the photoinduced dynamics of the chiral polyfluorene-phenylene copolymer PFPh in THF and in cholesteric thin films. After photoexcitation at 370 nm in THF, ultraviolet-visible-near-infrared (UV-vis-NIR) transient absorption spectra show fast subpicosecond to picosecond intrachain migration of singlet excitons, solvation dynamics, and an exciton lifetime of 410 ps. The PFPh thin film features also interchain singlet exciton migration and exhibits shorter (2.1 and 240 ps) and longer lifetime components (2800 ps, interchain recombination). Furthermore, a setup for ultrafast UV-vis broadband transient circular dichroism (TrCD) spectroscopy has been developed. Fast supramolecular relaxation processes are observed, which are linked to changes in the anisotropic polarizability and pitch length of the cholesteric film. Such combined ultrafast transient CD and absorption experiments hold promise to reveal not only details of relaxation processes in supramolecular arrangements but also structural rearrangements of chiral molecular systems featuring CD signals in the UV-vis region.
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Affiliation(s)
- Mirko Scholz
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Marius Morgenroth
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Kawon Oum
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Thomas Lenzer
- Physical Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
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Jeong CH, Godumala M, Yoon J, Choi S, Kim YW, Choi DH, Cho MJ, Choi DH. Hole-Transporting Side-Chain Polymer Bearing a Thermally Crosslinkable Bicyclo[4.2.0]octa-1,3,5-trien-3-yl Group for High-Performing Thermally Activated Delayed Fluorescence OLED. ACS Appl Mater Interfaces 2019; 11:17602-17609. [PMID: 31012568 DOI: 10.1021/acsami.9b03446] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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
A new side-chain polymer (X-TPACz) bearing hole-transporting pendant groups accompanying a thermally crosslinkable entity was synthesized using N-([1,1'-biphenyl]-4-yl)- N-(4-(9-(4-vinylbenzyl)-9 H-carbazol-3-yl)phenyl)bicyclo[4.2.0]octa-1(6),2,4-trien-3-amine (6) via addition polymerization. The X-TPACz could be spontaneously crosslinked without using any further reagents and showed a good film-forming property upon low-temperature thermal treatment. The thermal curing temperature for the X-TPACz film was optimized to be 180 °C based on a differential scanning calorimetry thermogram. Moreover, the thermal degradation temperature of X-TPACz measured to be over 467 °C using thermogravimetric analysis demonstrated that it shows excellent thermal stability. In particular, X-TPACz exhibits the highest occupied molecular orbital (HOMO) energy level to be -5.26 eV, which is beneficial for facile hole injection and transportation. Consequently, the thermally activated delayed fluorescence organic light-emitting diodes fabricated using X-TPACz as the hole-transporting material showed state-of-the-art performances with a low turn-on voltage ( Von) of only 2.7 V and a high external quantum efficiency (EQE) of 19.18% with a high current efficiency (CE) of 66.88 cd/A and a high power efficiency (PE) of 60.03 lm/W, which are highly superior to those of the familiar poly(9-vinylcarbazole) (PVK)-based devices ( Von = 3.9 V, EQE of 17.42%, with CE of 58.33 cd/A and PE of 33.32 lm/W). The extremely low turn-on voltage and high EQE were found to be due to the higher-lying highest occupied molecular orbital energy level ( EHOMO = -5.23 eV) and better hole-transporting property of X-TPACz than those of PVK.
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Affiliation(s)
- Cheol Hun Jeong
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Mallesham Godumala
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Jiwon Yoon
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Suna Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Yong Woo Kim
- LT Materials , 113-19, Dangha-Ro , Namsa-Myeon, Cheoin-Gu, Yongin-Si , Gyeonggi-Do 17118 , Korea
| | - Dae Hyuk Choi
- LT Materials , 113-19, Dangha-Ro , Namsa-Myeon, Cheoin-Gu, Yongin-Si , Gyeonggi-Do 17118 , Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-ro , Sungbuk-gu, Seoul 02841 , Korea
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Reeves B, Ram N, Robinson TN, Cummings JJ, Giles CL, Pan J, Chiatti A, Cho MJ, Roehrick K, Yang X, Gagneja A, Brinberg M, Muise D, Lu Y, Luo M, Fitzgerald A, Yeykelis L. Screenomics: A Framework to Capture and Analyze Personal Life Experiences and the Ways that Technology Shapes Them. Hum Comput Interact 2019; 36:150-201. [PMID: 33867652 PMCID: PMC8045984 DOI: 10.1080/07370024.2019.1578652] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Digital experiences capture an increasingly large part of life, making them a preferred, if not required, method to describe and theorize about human behavior. Digital media also shape behavior by enabling people to switch between different content easily, and create unique threads of experiences that pass quickly through numerous information categories. Current methods of recording digital experiences provide only partial reconstructions of digital lives that weave - often within seconds - among multiple applications, locations, functions and media. We describe an end-to-end system for capturing and analyzing the "screenome" of life in media, i.e., the record of individual experiences represented as a sequence of screens that people view and interact with over time. The system includes software that collects screenshots, extracts text and images, and allows searching of a screenshot database. We discuss how the system can be used to elaborate current theories about psychological processing of technology, and suggest new theoretical questions that are enabled by multiple time scale analyses. Capabilities of the system are highlighted with eight research examples that analyze screens from adults who have generated data within the system. We end with a discussion of future uses, limitations, theory and privacy.
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Kim HJ, Kim SK, Godumala M, Yoon J, Kim CY, Jeong JE, Woo HY, Kwon JH, Cho MJ, Choi DH. Novel molecular triad exhibiting aggregation-induced emission and thermally activated fluorescence for efficient non-doped organic light-emitting diodes. Chem Commun (Camb) 2019; 55:9475-9478. [DOI: 10.1039/c9cc05391c] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel molecular triad single-component emitter (BPCP-2CPC) exhibiting TADF and AIE characteristics was successfully synthesized and applied to solution-processed non-doped TADF-OLEDs.
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Kim HJ, Pei M, Ko JS, Ma MH, Park GE, Baek J, Yang H, Cho MJ, Choi DH. Influence of Branched Alkyl Ester-Labeled Side Chains on Specific Chain Arrangement and Charge-Transport Properties of Diketopyrrolopyrrole-Based Conjugated Polymers. ACS Appl Mater Interfaces 2018; 10:40681-40691. [PMID: 30381941 DOI: 10.1021/acsami.8b13292] [Citation(s) in RCA: 12] [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: 06/08/2023]
Abstract
A series of diketopyrrolopyrrole (DPP)-based copolymers, with DPP and bithiophene (BT) as the electron-acceptor and donor backbone units, respectively, are synthesized with branched alkyl side chains that are either directly coupled to the N-positions of DPP or separated by an alkyl ester group. The ester moieties in the side chains induce specific cohesive molecular interactions between these side chains, as compared to the alkyl-only side chains with weak van der Waals interactions. Structure analysis of the DPPBT-based copolymers demonstrated that the introduction of a proper alkyl ester spacer to the branched alkyl chains can shorten the π-π stacking distance between the DPPBT backbones down to 3.61 Å and promote the development of two-dimensionally extended domains. DPPBT-based copolymers, including different branched alkyl ester-labeled side chains, are spun-cast on polymer-treated SiO2 dielectrics from dilute chloroform solutions for organic thin-film transistors. A DPPBT-based copolymer with properly engineered side chains (i.e., 2-decyltetradecyl ester-labeled side chains) shows the highest hole mobility of 2.30 cm2 V-1 s-1 and an on/off current ratio of above 106.
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Affiliation(s)
- Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , Seoul 02841 , South Korea
| | - Mingyuan Pei
- Department of Applied Organic Materials Engineering , Inha University , Incheon 22212 , South Korea
| | - Joong Se Ko
- Department of Applied Organic Materials Engineering , Inha University , Incheon 22212 , South Korea
| | - Min Hee Ma
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , Seoul 02841 , South Korea
| | - Gi Eun Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , Seoul 02841 , South Korea
| | - Jimin Baek
- Department of Applied Organic Materials Engineering , Inha University , Incheon 22212 , South Korea
| | - Hoichang Yang
- Department of Applied Organic Materials Engineering , Inha University , Incheon 22212 , South Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , Seoul 02841 , South Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , Seoul 02841 , South Korea
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Lee JH, Park CG, Kim A, Kim HJ, Kim Y, Park S, Cho MJ, Choi DH. High-Performance Polymer Solar Cell with Single Active Material of Fully Conjugated Block Copolymer Composed of Wide-Band gap Donor and Narrow-Band gap Acceptor Blocks. ACS Appl Mater Interfaces 2018; 10:18974-18983. [PMID: 29761694 DOI: 10.1021/acsami.8b03580] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [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
We synthesized a novel fully conjugated block copolymer, P3, in which a wide-band gap donor block (P1) was connected to a narrow-band gap acceptor block (P2). As P3 contains P1 block with a wide bandgap and P2 block with a narrow bandgap, it exhibits a very wide complementary absorption. Transient photoluminescence measurement using P3 dilute solution demonstrated intramolecular charge transfer between the P1 block and the P2 block, which was not observed in a P1/P2 blend solution. A P3 thin film showed complete PL quenching because the photoinduced inter-/intramolecular charge transfer states were effectively formed. This phenomenon can play an important role in the photovoltaic properties of P3-based polymer solar cells. A single active material polymer solar cell (SAMPSC) fabricated from P3 alone exhibited a high power conversion efficiency (PCE) of 3.87% with a high open-circuit voltage of 0.93 V and a short-circuit current of 8.26 mA/cm2, demonstrating a much better performance than a binary P1-/P2-based polymer solar cell (PCE = 1.14%). This result facilitates the possible improvement of the photovoltaic performance of SAMPSCs by inducing favorable nanophase segregation between p- and n blocks. In addition, owing to the high morphological stability of the block copolymer, excellent shelf-life was observed in a P3-based SAMPSC compared with a P1/P2-based PSC.
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Affiliation(s)
- Ji Hyung Lee
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Chang Geun Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Aesun Kim
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Youngseo Kim
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 145 Anam-Ro , Sungbuk-gu, Seoul 136-701 , Korea
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Hoang MH, Park GE, Phan DL, Ngo TT, Nguyen TV, Park CG, Cho MJ, Choi DH. Synthesis of Conjugated Wide-Bandgap Copolymers Bearing Ladder-Type Donating Units and Their Application to Non-Fullerene Polymer Solar Cells. Macromol Res 2018. [DOI: 10.1007/s13233-018-6128-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Park SY, Choi S, Park GE, Kim HJ, Lee C, Moon JS, Kim SW, Park S, Kwon JH, Cho MJ, Choi DH. Unconventional Three-Armed Luminogens Exhibiting Both Aggregation-Induced Emission and Thermally Activated Delayed Fluorescence Resulting in High-Performing Solution-Processed Organic Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:14966-14977. [PMID: 29630336 DOI: 10.1021/acsami.7b19681] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this work, three-armed luminogens IAcTr-out and IAcTr-in were synthesized and used as emitters bearing triazine and indenoacridine moieties in thermally activated delayed fluorescence organic light-emitting diodes (OLEDs). These molecules could form a uniform thin film via the solution process and also allowed the subsequent deposition of an electron transporting layer either by vacuum deposition or by an all-solution coating method. Intriguingly, the new luminogens displayed aggregation-induced emission (AIE), which is a unique photophysical phenomenon. As a nondoped emitting layer (EML), IAcTr-in showed external quantum efficiencies (EQEs) of 11.8% for the hybrid-solution processed OLED and 10.9% for the all-solution processed OLED with a low efficiency roll-off. This was evident by the higher photoluminescence quantum yield and higher rate constant of reverse intersystem crossing of IAcTr-in, as compared to IAcTr-out. These AIE luminogens were used as dopants and mixed with the well-known host material 1,3-bis( N-carbazolyl)benzene (mCP) to produce a high-efficiency OLED with a two-component EML. The maximum EQE of 17.5% was obtained when using EML with IAcTr-out doping (25 wt %) into mCP, and the OLED with EML bearing IAcTr-in and mCP showed a higher maximum EQE of 18.4% as in the case of the nondoped EML-based device.
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Affiliation(s)
- Seo Yeon Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
| | - Suna Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
| | - Gi Eun Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
- Photo-electronic Hybrids Research Center , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
| | - Chiho Lee
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
| | - Ji Su Moon
- Department of Information Display , Kyung Hee University , 26, Kyungheedae-ro , Dongdaemun-gu, Seoul 02447 , Korea
| | - Si Woo Kim
- Department of Information Display , Kyung Hee University , 26, Kyungheedae-ro , Dongdaemun-gu, Seoul 02447 , Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
| | - Jang Hyuk Kwon
- Department of Information Display , Kyung Hee University , 26, Kyungheedae-ro , Dongdaemun-gu, Seoul 02447 , Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences , Korea University , 5 Anam-dong , Seongbuk-gu, Seoul 136-701 , Korea
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43
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Hoang MH, Park GE, Phan DL, Ngo TT, Nguyen TV, Park SH, Cho MJ, Choi DH. High-performing random terpolymer-based nonfullerene polymer solar cells fabricated using solvent additive-free as-cast blend films. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.29034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Mai Ha Hoang
- Institute of Chemistry, Vietnam Academy of Science and Technology; Cau Giay Hanoi Vietnam
| | - Gi Eun Park
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; Seoul Sungbuk-gu 02841 Republic of Korea
| | - Dinh Long Phan
- Institute of Chemistry, Vietnam Academy of Science and Technology; Cau Giay Hanoi Vietnam
| | - Trinh Tung Ngo
- Institute of Chemistry, Vietnam Academy of Science and Technology; Cau Giay Hanoi Vietnam
| | - Tuyen Van Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology; Cau Giay Hanoi Vietnam
| | - Su Hong Park
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; Seoul Sungbuk-gu 02841 Republic of Korea
| | - Min Ju Cho
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; Seoul Sungbuk-gu 02841 Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; Seoul Sungbuk-gu 02841 Republic of Korea
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Ban SP, Kwon OK, Lee SU, Bang JS, Oh CW, Jeong HJ, Cho MJ, Jeong EA, Kim T. Long-Term Outcomes of Patients with Stent Tips Embedded into Internal Carotid Artery Branches during Aneurysm Coiling. AJNR Am J Neuroradiol 2018. [PMID: 29519788 DOI: 10.3174/ajnr.a5583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE During stent-assisted coiling of ICA aneurysms, stent tips are sometimes unintentionally embedded into ICA branches. Stent tips can be visualized because they have radiopaque markers. Concerns regarding stent tip misplacement include risks of artery perforation and occlusion. The aim of this study was to evaluate the long-term outcomes of ICA branches with embedded stent tips. MATERIALS AND METHODS ICA branches with embedded stent tips were identified among 35 patients with unruptured ICA aneurysms treated with stent-assisted coiling between November 2003 and November 2014. Patient clinical and angiographic outcomes associated with the embedded stent tip were analyzed. RESULTS Most of the 35 studied aneurysms were paraclinoid ICA aneurysms (n = 30). The most commonly involved ICA branch was the posterior communicating artery (26 patients, 74.3%), followed by the anterior choroidal artery (8 patients, 22.9%) and ophthalmic artery (1 patient, 2.9%). During the follow-up period (38.6 ± 17.9 months), no new neurologic deficits developed. Neither hemorrhagic nor thromboembolic events occurred. Angiography was performed during the final follow-up evaluation at a mean of 32.7 ± 18.0 months, and all ICA branches with embedded stent tips showed patent blood flow without severe luminal narrowing. CONCLUSIONS In our experience, placement of a stent tip into ICA branches during stent-assisted coiling was not associated with any major adverse events.
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Affiliation(s)
- S P Ban
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - O-K Kwon
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - S U Lee
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - J S Bang
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - C W Oh
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - H J Jeong
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - M J Cho
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - E-A Jeong
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - T Kim
- From the Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea.
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45
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Kim HJ, Lee C, Godumala M, Choi S, Park SY, Cho MJ, Park S, Choi DH. Solution-processed thermally activated delayed fluorescence organic light-emitting diodes using a new polymeric emitter containing non-conjugated cyclohexane units. Polym Chem 2018. [DOI: 10.1039/c7py02113e] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A new solution-processable polymeric emitter containing non-conjugated cyclohexane units was developed for high-performing TADF-OLEDs.
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Affiliation(s)
- Hyung Jong Kim
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Chiho Lee
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Mallesham Godumala
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Suna Choi
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Seo Yeon Park
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Min Ju Cho
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Sungnam Park
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Seoul 136-701
- Republic of Korea
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46
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Ko EY, Park GE, Lee JH, Kim HJ, Lee DH, Ahn H, Uddin MA, Woo HY, Cho MJ, Choi DH. Excellent Long-Term Stability of Power Conversion Efficiency in Non-Fullerene-Based Polymer Solar Cells Bearing Tricyanovinylene-Functionalized n-Type Small Molecules. ACS Appl Mater Interfaces 2017; 9:8838-8847. [PMID: 28233973 DOI: 10.1021/acsami.6b15707] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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
New small molecules having modified acceptor strength and π-conjugation length and containing dicyanovinylene (DCV) and tricyanovinylene (TCV) as a strongly electron-accepting unit with indacenodithiophene, IDT(DCV)2, IDT(TCV)2, and IDTT(TCV)2, were synthesized and studied in terms of their applicability to polymer solar cells with PTB7-Th as an electron-donating polymer. Intriguingly, the blended films containing IDT(TCV)2 and IDTT(TCV)2 exhibited superior shelf life stabilities of more than 1000 h without any reduction in the initial power conversion efficiency. The low-lying lowest unoccupied molecular orbital energy levels and robust internal morphologies of small TCV-containing molecules could afford excellent shelf life stability.
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Affiliation(s)
- Eun Yi Ko
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Gi Eun Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Ji Hyung Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Hyung Jong Kim
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Dae Hee Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Hyungju Ahn
- Department of Life Science & Chemical Materials, Pohang Accelerator Laboratory, POSTECH , 80 Jigok-ro, Nam-gu Pohang 790-834, Korea
| | - Mohammad Afsar Uddin
- Department of Nanofusion Engineering, Departement of Cogno-Mechatronics Engineering, Pusan National University , Miryang 627-706, Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
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47
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Choi S, Park GE, Lee DH, Godumala M, Cho MJ, Choi DH. Quinoxaline-based D-A conjugated polymers for organic solar cells: Probing the effect of quinoxaline side chains and fluorine substitution on the power conversion efficiency. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28483] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Suna Choi
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; 5 Anam-dong Sungbuk-gu, Seoul 136-701 South Korea
| | - Gi Eun Park
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; 5 Anam-dong Sungbuk-gu, Seoul 136-701 South Korea
| | - Dae Hee Lee
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; 5 Anam-dong Sungbuk-gu, Seoul 136-701 South Korea
| | - Mallesham Godumala
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; 5 Anam-dong Sungbuk-gu, Seoul 136-701 South Korea
| | - Min Ju Cho
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; 5 Anam-dong Sungbuk-gu, Seoul 136-701 South Korea
| | - Dong Hoon Choi
- Department of Chemistry; Research Institute for Natural Sciences, Korea University; 5 Anam-dong Sungbuk-gu, Seoul 136-701 South Korea
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48
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Cho MJ, Park GE, Park SY, Kim YU, Choi DH. Structural optimization of large acceptor–donor–acceptor-type molecules for improved performance of fullerene-free polymer solar cells. RSC Adv 2017. [DOI: 10.1039/c7ra06879d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The strategy of varying the donating core unit in large A–D–A molecules was found to influence the photovoltaic properties in fullerene-free BHJ PSCs.
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Affiliation(s)
- Min Ju Cho
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Sungbuk-gu
- Korea
| | - Gi Eun Park
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Sungbuk-gu
- Korea
| | - Seo Yeon Park
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Sungbuk-gu
- Korea
| | - Young-Un Kim
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Sungbuk-gu
- Korea
| | - Dong Hoon Choi
- Department of Chemistry
- Research Institute for Natural Sciences
- Korea University
- Sungbuk-gu
- Korea
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49
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Kim JY, Kim YU, Kim HJ, Um HA, Shin J, Cho MJ, Choi DH. Side-chain engineering of diketopyrrolopyrrole-based copolymer using alkyl ester group for efficient polymer solar cell. Macromol Res 2016. [DOI: 10.1007/s13233-016-4143-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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50
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Lim CK, Cho MJ, Singh A, Li Q, Kim WJ, Jee HS, Fillman KL, Carpenter SH, Neidig ML, Baev A, Swihart MT, Prasad PN. Manipulating Magneto-Optic Properties of a Chiral Polymer by Doping with Stable Organic Biradicals. Nano Lett 2016; 16:5451-5455. [PMID: 27518762 DOI: 10.1021/acs.nanolett.6b01874] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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
We report the first example of tuning the large magneto-optic activity of a chiral polymer by addition of stable organic biradicals. The spectral dispersion of Verdet constant, which quantifies magneto-optic response, differs substantially between the base polymer and the nanocomposite. We employed a microscopic model, supported by atomistic calculations, to rationalize the behavior of this nanocomposite system. The suggested mechanism involves magnetic coupling between helical conjugated polymer fibrils, with spatially delocalized helical π-electron density, and the high density of spin states provided by the biradical dopants, which leads to synergistic enhancement of magneto-optic response. Our combined experimental and theoretical studies reveal that the manipulation of magnetic coupling in this new class of magneto-optic materials offers an opportunity to tailor the magnitude, sign, and spectral dispersion of the Verdet constant over a broad range of wavelengths, from the UV to the near-IR. This provides a new strategy for creating conformable materials with extraordinary magneto-optic activity, which can ultimately enable new applications requiring spatially and temporally resolved measurement of extremely weak magnetic fields. In particular, magneto-optic materials, presently employed in technologies like optical isolators and optical circulators, could be used in ultrasensitive optical magnetometers. This, in turn, could open a path toward mapping of brain activity via optical magnetoencephalography.
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Affiliation(s)
- Chang-Keun Lim
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Min Ju Cho
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Ajay Singh
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Qi Li
- Department of Chemical and Biological Engineering, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Won Jin Kim
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Hong Sub Jee
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Kathlyn L Fillman
- Department of Chemistry, University of Rochester , Rochester, New York 14627, United States
| | - Stephanie H Carpenter
- Department of Chemistry, University of Rochester , Rochester, New York 14627, United States
| | - Michael L Neidig
- Department of Chemistry, University of Rochester , Rochester, New York 14627, United States
| | - Alexander Baev
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Mark T Swihart
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
- Department of Chemical and Biological Engineering, State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Paras N Prasad
- The Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo , Buffalo, New York 14260, United States
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