系统间交叉
有机发光二极管
量子产额
量子效率
共发射极
光致发光
光电子学
材料科学
荧光
二极管
共振(粒子物理)
共振荧光
化学
光化学
原子物理学
纳米技术
光学
激发态
物理
单重态
图层(电子)
作者
Ping Lü,Futong Liu,Zhuang Cheng,Yixuan Jiang,Lei Gao,Han-Xuan Liu,Hui Liu,Zijun Feng,Wensheng Yang
标识
DOI:10.1002/anie.202116927
摘要
Multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters show great potentials for high color purity organic light-emitting diodes (OLEDs). However, the simultaneous realization of high photoluminescence quantum yield (PLQY) and high reverse intersystem crossing rate (kRISC ) is still a formidable challenge. Herein, a novel asymmetric MR-TADF emitter (2Cz-PTZ-BN) is designed that fully inherits the high PLQY and large kRISC values of the properly selected parent molecules. The resonating extended π-skeleton with peripheral protection can achieve a high PLQY of 96 % and a fast kRISC of above 1.0×105 s-1 , and boost the performance of corresponding pure green devices with an outstanding external quantum efficiency (EQE) of up to 32.8 % without utilizing any sensitizing hosts. Remarkably, the device sufficiently maintains a high EQE exceeding 23 % at a high luminance of 1000 cd m-2 , representing the highest value for reported green MR-TADF materials at the same luminescence.
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