Du Yuqin, Peng Yali, Dong Wenjian, Xu Huixia, Li Xinyu, Chen Kang, Wang Feng, Miao Yanqin, Tao Peng, Wang Hua, Yu Junsheng
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology Taiyuan 030024 China
College of Physics and Optoelectronics, Taiyuan University of Technology Taiyuan 030024 China.
Chem Sci. 2025 May 20;16(31):14342-14349. doi: 10.1039/d5sc01756d. eCollection 2025 Aug 6.
The development of organic light-emitting diodes (OLED) with low efficiency roll-off at high brightness still remains a significant challenge. The hot-exciton mechanism provides a potential solution owing to its unique high-lying reverse intersystem crossing (hRISC) with a sufficiently large rate constant. Herein, two pyrene-based hot-exciton molecules, namely TPAPyCP and 2mTPAPyCP, were successfully designed using triphenylamine (TPA) as donor and benzonitrile as acceptor. The planar pyrene provided multiple fast hRISC channels, which effectively improved the photoluminescence quantum yield (PLQY) values to 73.2% and 65.8% in neat films. A non-doped device based on TPAPyCP demonstrated a maximum external quantum efficiency (EQE) of 9.41% and still maintained 8.95% at a high luminance of 10 000 cd m, highlighting a negligible efficiency roll-off of 4.97%.
开发在高亮度下具有低效率滚降的有机发光二极管（OLED）仍然是一项重大挑战。热激子机制因其独特的高位反向系间窜越（hRISC）和足够大的速率常数而提供了一种潜在的解决方案。在此，以三苯胺（TPA）为供体、苯甲腈为受体，成功设计了两种基于芘的热激子分子，即TPAPyCP和2mTPAPyCP。平面芘提供了多个快速hRISC通道，在纯薄膜中有效地将光致发光量子产率（PLQY）值提高到73.2%和65.8%。基于TPAPyCP的非掺杂器件表现出9.41%的最大外量子效率（EQE），在10000 cd m的高亮度下仍保持8.95%，突出显示了4.97%的可忽略不计的效率滚降。
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