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Zhang Y, Liang X, Luo X, Song S, Li S, Wang Y, Mao Z, Xu W, Zheng Y, Zuo J, Pan Y. Chiral Spiro‐Axis Induced Blue Thermally Activated Delayed Fluorescence Material for Efficient Circularly Polarized OLEDs with Low Efficiency Roll‐Off. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015411] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yi‐Pin Zhang
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Xiao Liang
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Xu‐Feng Luo
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Shi‐Quan Song
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Si Li
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
- Green Catalysis Center College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
| | - Yi Wang
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Zhi‐Ping Mao
- Guangzhou Research & Creativity Biotechnology Co. Ltd. Guangzhou 510700 P. R. China
| | - Wen‐Ye Xu
- Guangzhou Research & Creativity Biotechnology Co. Ltd. Guangzhou 510700 P. R. China
| | - You‐Xuan Zheng
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
- Green Catalysis Center College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
| | - Jing‐Lin Zuo
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
- Green Catalysis Center College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
| | - Yi Pan
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
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Zhang YP, Liang X, Luo XF, Song SQ, Li S, Wang Y, Mao ZP, Xu WY, Zheng YX, Zuo JL, Pan Y. Chiral Spiro-Axis Induced Blue Thermally Activated Delayed Fluorescence Material for Efficient Circularly Polarized OLEDs with Low Efficiency Roll-Off. Angew Chem Int Ed Engl 2021; 60:8435-8440. [PMID: 33470028 DOI: 10.1002/anie.202015411] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/12/2021] [Indexed: 12/18/2022]
Abstract
A spiro-axis skeleton not only introduces circularly polarized luminescence (CPL) into thermally activated delayed fluorescence (TADF) molecules but also enhances the intramolecular through space charge transfer (TSCT) process. Spiral distributed phenoxazine and 2-(trifluoromethyl)-9H-thioxanthen-9-one-10,10-dioxide act as donor and acceptor units, respectively. The resulting TADF enantiomers, (rac)-OSFSO, display emission maxima at 470 nm, small singlet-triplet energy gap (ΔEST ) of 0.022 eV and high photoluminescence quantum yield (PLQY) of 81.2 % in co-doped film. The circularly polarized OLEDs (CP-OLEDs) based on (R)-OSFSO and (S)-OSFSO display obvious circularly polarized electroluminescence (CPEL) signals with dissymmetry factor up to 3.0×10-3 and maximum external quantum efficiency (EQEmax ) of 20.0 %. Moreover, the devices show remarkably low efficiency roll-off with an EQE of 19.3 % at 1000 cd m-2 (roll-off ca. 3.5 %), which are among the top results of CP-OLEDs.
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Affiliation(s)
- Yi-Pin Zhang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Xiao Liang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Xu-Feng Luo
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Shi-Quan Song
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Si Li
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.,Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Yi Wang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Zhi-Ping Mao
- Guangzhou Research & Creativity Biotechnology Co. Ltd., Guangzhou, 510700, P. R. China
| | - Wen-Ye Xu
- Guangzhou Research & Creativity Biotechnology Co. Ltd., Guangzhou, 510700, P. R. China
| | - You-Xuan Zheng
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.,Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China.,Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Yi Pan
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
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Wu ZG, Han HB, Yan ZP, Luo XF, Wang Y, Zheng YX, Zuo JL, Pan Y. Chiral Octahydro-Binaphthol Compound-Based Thermally Activated Delayed Fluorescence Materials for Circularly Polarized Electroluminescence with Superior EQE of 32.6% and Extremely Low Efficiency Roll-Off. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1900524. [PMID: 31106503 DOI: 10.1002/adma.201900524] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/16/2019] [Indexed: 05/15/2023]
Abstract
Circularly polarized organic light-emitting diodes (CP-OLEDs) are particularly favorable for the direct generation of CP light, and they demonstrate a promising application in 3D display. However, up to now, such CP devices have suffered from low brightness, insufficient efficiency, and serious efficiency roll-off. In this study, a pair of octahydro-binaphthol (OBN)-based chiral emitting enantiomers, (R/S)-OBN-Cz, are developed by ingeniously merging a chiral source and a luminophore skeleton. These chirality-acceptor-donor (C-A-D)-type and rod-like compounds concurrently generate thermally activated delayed fluorescence with a small ΔEST of 0.037 eV, as well as a high photoluminescence quantum yield of 92% and intense circularly polarized photoluminescence with dissymmetry factors (|gPL |) of ≈2.0 × 10-3 in thin films. The CP-OLEDs based on (R/S)-OBN-Cz enantiomers not only display obvious circularly polarized electroluminescence signals with a |gEL | of ≈2.0 × 10-3 , but also exhibit superior efficiencies with maximum external quantum efficiency (EQEmax ) up to 32.6% and extremely low efficiency roll-off with an EQE of 30.6% at 5000 cd m-2 , which are the best performances among the reported CP devices to date.
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Affiliation(s)
- Zheng-Guang Wu
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Hua-Bo Han
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Zhi-Ping Yan
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Xu-Feng Luo
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Yi Wang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - You-Xuan Zheng
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Yi Pan
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
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Cai M, Zhang D, Xu J, Hong X, Zhao C, Song X, Qiu Y, Kaji H, Duan L. Unveiling the Role of Langevin and Trap-Assisted Recombination in Long Lifespan OLEDs Employing Thermally Activated Delayed Fluorophores. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1096-1108. [PMID: 30525372 DOI: 10.1021/acsami.8b16784] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Recent research studies on noble-metal-free thermally activated delayed fluorescent (TADF) materials have boosted the efficiencies of organic light-emitting diodes (OLEDs) to unity. However, the short lifespan still hinders their further practical application. Carrier recombination pathways have been reported to have a significant influence on the efficiencies of TADF devices, though their effects on device lifetimes remain rarely studied. Here, we have designed and synthesized five pyrimidine or pyrazine/carbazole isomers as hosts for TADF OLEDs to explore the inherent role of Langevin recombination (LR) and trap-assisted recombination (TAR) in device lifetimes. It is revealed that for LR dominant devices, lifetimes would increase by reducing the host triplet energy levels, whereas for TAR dominant devices, lifetimes are insensitive to the host triplet excitons as recombination mainly takes place on dopants. Still, LR dominant devices are favored as they offer more room for optimization. We further apply this concept in designing a stable LR dominant blue TADF device, achieving a long LT50 (lifespan up to 50% of the initial luminance) of 269 h and high external quantum efficiency of 17.9% at 1000 cd m-2 simultaneously.
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Affiliation(s)
| | | | | | | | | | | | | | - Hironori Kaji
- Institute for Chemical Research , Kyoto University , Uji , Kyoto 6611-0011 , Japan
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Cai M, Zhang D, Duan L. High Performance Thermally Activated Delayed Fluorescence Sensitized Organic Light‐Emitting Diodes. CHEM REC 2018; 19:1611-1623. [DOI: 10.1002/tcr.201800148] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/23/2018] [Indexed: 01/22/2023]
Affiliation(s)
- Minghan Cai
- Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of EducationDepartment of ChemistryTsinghua University Beijing 100084 China
| | - Dongdong Zhang
- Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of EducationDepartment of ChemistryTsinghua University Beijing 100084 China
| | - Lian Duan
- Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of EducationDepartment of ChemistryTsinghua University Beijing 100084 China
- Center for Flexible Electronics TechnologyTsinghua University Beijing 100084 China
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