分子内力
准分子
激发态
接受者
量子效率
荧光
电致发光
光致发光
单重态
光化学
化学
材料科学
光电子学
原子物理学
光学
纳米技术
物理
立体化学
图层(电子)
凝聚态物理
作者
Chao Wu,Weiqiang Liu,Kai Li,Gang Cheng,Jinfan Xiong,Teng Teng,Chi‐Ming Che,Chuluo Yang
标识
DOI:10.1002/anie.202013051
摘要
Abstract Intramolecular through‐space charge‐transfer (TSCT) excited states have been exploited for developing thermally activated delayed fluorescence (TADF) emitters, but the tuning of excited state dynamics by conformational engineering remains sparse. Designed here is a series of TSCT emitters with precisely controlled alignment of the donor and acceptor segments. With increasing intramolecular π–π interactions, the radiative decay rate of the lowest singlet excited state (S 1 ) progressively increased together with a suppression of nonradiative decay, leading to significantly enhanced photoluminescence quantum yields of up to 0.99 in doped thin films. A high‐efficiency electroluminescence device, with a maximum external quantum efficiency (EQE) of 23.96 %, was achieved and maintains >20 % at a brightness of 1000 cd m −2 . This work sheds light on the importance of conformation control for achieving high‐efficiency intramolecular exciplex emitters.
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