The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Yun Chi - One of the best experts on this subject based on the ideXlab platform.
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Blue to True-Blue Phosphorescent IrIII Complexes Bearing a Nonconjugated Ancillary Phosphine Chelate: Strategic Synthesis, Photophysics, and Device Integration
ACS applied materials & interfaces, 2009Co-Authors: Yuan-chieh Chiu, Yun Chi, Jui-yi Hung, Yi-ming Cheng, Ming-wen Chung, Gene-hsiang Lee, Pi-tai Chou, Chung-chia ChenAbstract:We report the design and synthesis of IrIII complexes functionalized with substituted pyridyl cyclometalate or azolate chromophores, plus one newly designed nonconjugated phosphine chelate, which not only greatly restricts its participation in the lowest-lying electronic transition but also enhances the coordination strength. These two key factors lead to fine-tuning of the phosphorescence chromaticity toward authentic Blue and simultaneously suppress, in part, the nonradiative deactivation. This conceptual design presents a novel strategy in achieving heretofore uncommon, high-efficiency Blue and True-Blue phosphorescence. The fabrication of the organic light-emitting devices (OLEDs) employing phosphorescent dopants [Ir(dfpbpy)2(P∧N)] (1b) and [Ir(fppz)2(P∧N)] (3) was successfully made, for which the abbreviations (dfpbpy)H, (fppz)H, and (P∧N)H represent 2-(4,6-difluorophenyl)-4-tert-butylpyridine, 3-(trifluoromethyl)-5-(2-pyridyl)pyrazole, and 5-(diphenylphosphinomethyl)-3-(trifluoromethyl)pyrazole, res...
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Efficient iridium(III) based, True-Blue emitting phosphorescent OLEDS employing both double emission and double buffer layers
Organic Electronics, 2009Co-Authors: Chih-hao Chang, Chung-chia Chen, Cheng-han Yang, Yun ChiAbstract:New device architectures and efficient iridium based phosphors were simultaneously developed for fabrication of True-Blue phosphorescent organic light-emitting devices (OLEDs). To fully explore the potential of these True-Blue-emitting phosphors, we employed a device architecture that incorporates both double-emitting layers (one with hole-transport and the second with electron-transport materials) and double buffer layers for efficient exciton confinement. In addition, the parent, True-Blue emitting heteroleptic Ir III complex Ir1 was synthesized by incorporating one 4,6-difluorophenyl-2-pyridyl cyclometalate (dfppy) together with two 3-(trifluoromethyl)-5-pyridyl pyrazolates (fppz), while others derivatives Ir2–Ir4 were prepared by addition of alkyl substituent at the pyridyl sites. Electrophosphorescence with efficiencies up to 13.7% photon/electron and 20.4 cd/ A, and with adequate CIEx,y color coordinates of (0.157, 0.189) were successfully achieved.
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p 212 architecture design for efficient True Blue phosphorescent oleds
SID Symposium Digest of Technical Papers, 2008Co-Authors: Chung-chia Chen, Chih-hao Chang, Cheng-han Yang, Yun ChiAbstract:In this paper, we report an effective architecture for True-Blue phosphorescent OLEDs using a series of novel Blue-emitting Ir complexes. It incorporates double-emitting layers (one hole-transport, one electron-transport) and double buffer layers, for achieving balanced carrier injection/transport and carrier/exciton confinement. The efficiencies of True-Blue phosphorescent OLEDs can be up to 13.7% photon/electron, 20.4 cd/A, 14 lm/W, with the True-Blue CIE coordinates of (0.157, 0.189).
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P‐212: Architecture Design for Efficient True‐Blue Phosphorescent OLEDs
SID Symposium Digest of Technical Papers, 2008Co-Authors: Chung-chia Chen, Chih-hao Chang, Cheng-han Yang, Yun ChiAbstract:In this paper, we report an effective architecture for True-Blue phosphorescent OLEDs using a series of novel Blue-emitting Ir complexes. It incorporates double-emitting layers (one hole-transport, one electron-transport) and double buffer layers, for achieving balanced carrier injection/transport and carrier/exciton confinement. The efficiencies of True-Blue phosphorescent OLEDs can be up to 13.7% photon/electron, 20.4 cd/A, 14 lm/W, with the True-Blue CIE coordinates of (0.157, 0.189).
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Blue-emitting heteroleptic iridium(III) complexes suitable for high-efficiency phosphorescent OLEDs.
Angewandte Chemie (International ed. in English), 2007Co-Authors: Cheng-han Yang, Chih-hao Chang, Yun Chi, Yi-ming Cheng, Pi-tai Chou, Chia-jung Hsu, Fu-chuan Fang, Ken-tsung Wong, Ming-han TsaiAbstract:[[abstract]]Dyed-in-the-wool True Blue: True-Blue phosphorescent organic light-emitting diodes are fabricated by using an IrIII dopant (see picture; gray C; Blue N; red Ir; green F). The Ir complex has an enhanced metal-to-ligand charge-transfer contribution, hence a shortened radiative lifetime in the excited state. The maximum external quantum efficiency of the fabricated device is 8.5 % and the main emission is around 450 nm.[[fileno]]2010302010051[[department]]化學
Wei Huang - One of the best experts on this subject based on the ideXlab platform.
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multiphosphine oxide hosts for ultralow voltage driven True Blue thermally activated delayed fluorescence diodes with external quantum efficiency beyond 20
Advanced Materials, 2016Co-Authors: Jing Zhang, Dongxue Ding, Ying Wei, Fuquan Han, Wei HuangAbstract:Highly efficient low-voltage-driven -True-Blue thermally activated -delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2',4-tris(di(phenyl) -phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.
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Multiphosphine‐Oxide Hosts for Ultralow‐Voltage‐Driven True‐Blue Thermally Activated Delayed Fluorescence Diodes with External Quantum Efficiency beyond 20%
Advanced materials (Deerfield Beach Fla.), 2015Co-Authors: Jing Zhang, Dongxue Ding, Ying Wei, Fuquan Han, Wei HuangAbstract:Highly efficient low-voltage-driven -True-Blue thermally activated -delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2',4-tris(di(phenyl) -phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.
Ying Wei - One of the best experts on this subject based on the ideXlab platform.
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multiphosphine oxide hosts for ultralow voltage driven True Blue thermally activated delayed fluorescence diodes with external quantum efficiency beyond 20
Advanced Materials, 2016Co-Authors: Jing Zhang, Dongxue Ding, Ying Wei, Fuquan Han, Wei HuangAbstract:Highly efficient low-voltage-driven -True-Blue thermally activated -delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2',4-tris(di(phenyl) -phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.
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Multiphosphine‐Oxide Hosts for Ultralow‐Voltage‐Driven True‐Blue Thermally Activated Delayed Fluorescence Diodes with External Quantum Efficiency beyond 20%
Advanced materials (Deerfield Beach Fla.), 2015Co-Authors: Jing Zhang, Dongxue Ding, Ying Wei, Fuquan Han, Wei HuangAbstract:Highly efficient low-voltage-driven -True-Blue thermally activated -delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2',4-tris(di(phenyl) -phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.
Chung-chia Chen - One of the best experts on this subject based on the ideXlab platform.
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Blue to True-Blue Phosphorescent IrIII Complexes Bearing a Nonconjugated Ancillary Phosphine Chelate: Strategic Synthesis, Photophysics, and Device Integration
ACS applied materials & interfaces, 2009Co-Authors: Yuan-chieh Chiu, Yun Chi, Jui-yi Hung, Yi-ming Cheng, Ming-wen Chung, Gene-hsiang Lee, Pi-tai Chou, Chung-chia ChenAbstract:We report the design and synthesis of IrIII complexes functionalized with substituted pyridyl cyclometalate or azolate chromophores, plus one newly designed nonconjugated phosphine chelate, which not only greatly restricts its participation in the lowest-lying electronic transition but also enhances the coordination strength. These two key factors lead to fine-tuning of the phosphorescence chromaticity toward authentic Blue and simultaneously suppress, in part, the nonradiative deactivation. This conceptual design presents a novel strategy in achieving heretofore uncommon, high-efficiency Blue and True-Blue phosphorescence. The fabrication of the organic light-emitting devices (OLEDs) employing phosphorescent dopants [Ir(dfpbpy)2(P∧N)] (1b) and [Ir(fppz)2(P∧N)] (3) was successfully made, for which the abbreviations (dfpbpy)H, (fppz)H, and (P∧N)H represent 2-(4,6-difluorophenyl)-4-tert-butylpyridine, 3-(trifluoromethyl)-5-(2-pyridyl)pyrazole, and 5-(diphenylphosphinomethyl)-3-(trifluoromethyl)pyrazole, res...
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Efficient iridium(III) based, True-Blue emitting phosphorescent OLEDS employing both double emission and double buffer layers
Organic Electronics, 2009Co-Authors: Chih-hao Chang, Chung-chia Chen, Cheng-han Yang, Yun ChiAbstract:New device architectures and efficient iridium based phosphors were simultaneously developed for fabrication of True-Blue phosphorescent organic light-emitting devices (OLEDs). To fully explore the potential of these True-Blue-emitting phosphors, we employed a device architecture that incorporates both double-emitting layers (one with hole-transport and the second with electron-transport materials) and double buffer layers for efficient exciton confinement. In addition, the parent, True-Blue emitting heteroleptic Ir III complex Ir1 was synthesized by incorporating one 4,6-difluorophenyl-2-pyridyl cyclometalate (dfppy) together with two 3-(trifluoromethyl)-5-pyridyl pyrazolates (fppz), while others derivatives Ir2–Ir4 were prepared by addition of alkyl substituent at the pyridyl sites. Electrophosphorescence with efficiencies up to 13.7% photon/electron and 20.4 cd/ A, and with adequate CIEx,y color coordinates of (0.157, 0.189) were successfully achieved.
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p 212 architecture design for efficient True Blue phosphorescent oleds
SID Symposium Digest of Technical Papers, 2008Co-Authors: Chung-chia Chen, Chih-hao Chang, Cheng-han Yang, Yun ChiAbstract:In this paper, we report an effective architecture for True-Blue phosphorescent OLEDs using a series of novel Blue-emitting Ir complexes. It incorporates double-emitting layers (one hole-transport, one electron-transport) and double buffer layers, for achieving balanced carrier injection/transport and carrier/exciton confinement. The efficiencies of True-Blue phosphorescent OLEDs can be up to 13.7% photon/electron, 20.4 cd/A, 14 lm/W, with the True-Blue CIE coordinates of (0.157, 0.189).
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P‐212: Architecture Design for Efficient True‐Blue Phosphorescent OLEDs
SID Symposium Digest of Technical Papers, 2008Co-Authors: Chung-chia Chen, Chih-hao Chang, Cheng-han Yang, Yun ChiAbstract:In this paper, we report an effective architecture for True-Blue phosphorescent OLEDs using a series of novel Blue-emitting Ir complexes. It incorporates double-emitting layers (one hole-transport, one electron-transport) and double buffer layers, for achieving balanced carrier injection/transport and carrier/exciton confinement. The efficiencies of True-Blue phosphorescent OLEDs can be up to 13.7% photon/electron, 20.4 cd/A, 14 lm/W, with the True-Blue CIE coordinates of (0.157, 0.189).
Jing Zhang - One of the best experts on this subject based on the ideXlab platform.
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multiphosphine oxide hosts for ultralow voltage driven True Blue thermally activated delayed fluorescence diodes with external quantum efficiency beyond 20
Advanced Materials, 2016Co-Authors: Jing Zhang, Dongxue Ding, Ying Wei, Fuquan Han, Wei HuangAbstract:Highly efficient low-voltage-driven -True-Blue thermally activated -delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2',4-tris(di(phenyl) -phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.
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Multiphosphine‐Oxide Hosts for Ultralow‐Voltage‐Driven True‐Blue Thermally Activated Delayed Fluorescence Diodes with External Quantum Efficiency beyond 20%
Advanced materials (Deerfield Beach Fla.), 2015Co-Authors: Jing Zhang, Dongxue Ding, Ying Wei, Fuquan Han, Wei HuangAbstract:Highly efficient low-voltage-driven -True-Blue thermally activated -delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2',4-tris(di(phenyl) -phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.