Journal ArticleDOI
High-efficiency organic light-emitting diodes utilizing thermally activated delayed fluorescence from triazine-based donor–acceptor hybrid molecules
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TLDR
In this paper, a high-efficiency purely organic luminescent material, 2,4-bis{3-(H-carbazol-9-yl)-9, 9, carbazol 9-yl}-6-phenyl-1,3,5-triazine (CC2TA) comprising the bicarbazole donor and phenyltriazine acceptor units, which is capable of emitting thermally activated delayed fluorescence.Abstract:
We have designed and synthesized a high-efficiency purely organic luminescent material, 2,4-bis{3-(9 H-carbazol-9-yl)-9 H-carbazol-9-yl}-6-phenyl-1,3,5-triazine (CC2TA) comprising the bicarbazole donor and phenyltriazine acceptor units, which is capable of emitting thermally activated delayed fluorescence. The molecular design of CC2TA allows spatial separation of HOMO and LUMO on the donor and acceptor fragments, respectively, leading to an exceptionally small singlet–triplet exchange energy (ΔEST = 0.06 eV) together with a high triplet energy. Furthermore, a high external electroluminescence quantum efficiency as high as 11% ± 1% has been achieved in the sky-blue organic light-emitting diodes employing CC2TA as an emitter.read more
Citations
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Journal ArticleDOI
Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence
Qisheng Zhang,Bo Li,Shuping Huang,Hiroko Nomura,Hiroyuki Tanaka,Chihaya Adachi,Chihaya Adachi +6 more
TL;DR: In this article, a blue organic light-emitting diodes that harness thermally activated delayed fluorescence was realized with an external quantum efficiency of 19.5% and reduced roll-off at high luminance.
Journal ArticleDOI
Recent advances in organic thermally activated delayed fluorescence materials.
Zhiyong Yang,Zhu Mao,Zongliang Xie,Yi Zhang,Siwei Liu,Juan Zhao,Jiarui Xu,Zhenguo Chi,Matthew P. Aldred +8 more
TL;DR: This review summarizes and discusses the latest progress concerning this rapidly developing research field, in which the majority of the reported TADF systems are discussed, along with their derived structure-property relationships, TadF mechanisms and applications.
Journal ArticleDOI
Thermally Activated Delayed Fluorescence Materials Towards the Breakthrough of Organoelectronics
Ye Tao,Kai Yuan,Ting Chen,Peng Xu,Huanhuan Li,Runfeng Chen,Chao Zheng,Lei Zhang,Wei Huang,Wei Huang +9 more
TL;DR: An overview of the quick development in TADF mechanisms, materials, and applications is presented, with a particular emphasis on their different types of metal-organic complexes, D-A molecules, and fullerenes.
Patent
Organic light-emitting device
Yoon-Hyun Kwak,Seok-Hwan Hwang,Young-Kook Kim,Hye-jin Jung,Jong-hyuk Lee,Jin-O Lim,Hyung-Jun Song +6 more
TL;DR: In this paper, the authors presented a heterocyclic compound and an organic light-emitting device including the HOC compound, which have high efficiency, low driving voltage, high luminance and long lifespan.
Journal ArticleDOI
Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes.
TL;DR: A comprehensive review of TADF materials is presented, with a focus on linking their optoelectronic behavior with the performance of the organic light-emitting diode (OLED) and related EL devices.
References
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Nearly 100% internal phosphorescence efficiency in an organic light emitting device
TL;DR: In this paper, the authors demonstrate very high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent molecule doped into a wide energy gap host, achieving a maximum external quantum efficiency of 19.0±1.0 and luminous power efficiency of 60±5 lm/W.
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White Organic Light‐Emitting Devices for Solid‐State Lighting
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Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion
TL;DR: In this article, high efficiency fluorescent organic light-emitting diodes have been realized by employing custom-designed molecules that make it possible to convert non-radiative triplet states into radiative singlet states.
Journal ArticleDOI
Blue organic electrophosphorescence using exothermic host-guest energy transfer
Russell J. Holmes,Stephen R. Forrest,Yeh-Jiun Tung,Raymond Kwong,Julie J. Brown,Simona Garon,Mark E. Thompson +6 more
TL;DR: In this paper, the authors demonstrate efficient blue electrophosphorescence using exothermic energy transfer from a host consisting of N,N′-dicarbazolyl-3,5-benzene (mCP) to the phosphorescent iridium complex iridium(III)bis[(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic).