系统间交叉
共发射极
加速度
物理
光电子学
原子物理学
经典力学
单重态
激发态
作者
Yang Zou,Mingxin Yu,Yulin Xu,Zhengqi Xiao,Xiu‐Fang Song,Yuxuan Hu,Zhongyang Xu,Cheng Zhong,Jia He,Xiaosong Cao,Kai Li,Jingsheng Miao,Chuluo Yang
出处
期刊:Chem
[Elsevier]
日期:2024-02-01
被引量:1
标识
DOI:10.1016/j.chempr.2024.01.018
摘要
Summary
The cutting-edge organic light-emitting diode (OLED) applications require high device efficiency operating at high brightness, placing high demand on the device efficiency roll-off. The rapid reverse intersystem crossing rate (kRISC) of the thermally activated delayed fluorescence (TADF) emitter is crucial for achieving high-performance OLEDs with low efficiency roll-off. Herein, we demonstrate an effective approach to accelerate the kRISC of multi-resonance TADF emitters by the synergetic long-range charge transfer and heavy-atom effect. The proof-of-concept emitter shows a rapid kRISC of 2.2 × 106 s−1 and a radiative decay rate (kr) of 4.9 × 107 s−1 together with a near-unity photoluminescence quantum yield. Leveraging these exceptional properties, the corresponding OLED devices achieve a maximum external quantum efficiency (EQE) of nearly 30% with minimal efficiency roll-off, maintaining an EQE of 25.1% even at the brightness of 10,000 cd m−2. This study offers a fresh and impactful approach to tackle the efficiency roll-off concern in OLEDs.
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