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Novel Carbazol-Pyridine-Carbonitrile Derivative as Excellent Blue Thermally Activated Delayed Fluorescence Emitter for Highly Efficient Organic Light-Emitting Devices
journal contribution
posted on 2015-09-02, 00:00 authored by Wei Liu, Cai-Jun Zheng, Kai Wang, Zhan Chen, Dong-Yang Chen, Fan Li, Xue-Mei Ou, Yu-Ping Dong, Xiao-Hong ZhangA novel
blue thermally activated delayed fluorescence (TADF) emitter, CPC
(2,6-di(9H-carbazol-9-yl)-4-phenylpyridine-3,5-dicarbonitrile),
was designed and synthesized. By directly linking carbazole (to serve
as electron-donor) and pyridine-3,5-dicarbonitrile (to serve as electron-acceptor),
and distributing cyanogroups and carbazole groups at the para-position
of pyridine core, CPC successfully achieves an extremely small singlet–triplet
splitting and fairish photoluminescence quantum yield, thus can act
as the highly efficient blue TADF emitter. The optimized organic light-emitting
diode (OLED) based on 13 wt % CPC doped in mCP (1,3-bis(9H-carbazol-9-yl)benzene) host exhibits maximum current efficiency,
power efficiency, and external quantum efficiency of 47.7 cd A–1, 42.8 lm W–1, and 21.2%, respectively,
which are the best results in reported blue TADF-based devices up
to date and even comparable with the best reported blue phosphorescent
OLEDs.
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