系统间交叉
有机发光二极管
激子
共发射极
量子效率
光电子学
材料科学
电效率
分子内力
单重态
化学
激发态
功率(物理)
原子物理学
纳米技术
物理
图层(电子)
量子力学
立体化学
作者
Ning Yang,Guoqiang Yue,Yong Zhang,Xiaoyu Qin,Zhiqiang Gao,Baoxiu Mi,Quli Fan,Yan Qian
出处
期刊:Small
[Wiley]
日期:2023-10-11
标识
DOI:10.1002/smll.202304615
摘要
Hot exciton organic light-emitting diode (OLED) emitters can balance the high performance of a device and reduce efficiency roll-off by fast reverse intersystem crossing from high-lying triplets (hRISC). In this study, an excited-state intramolecular proton transfer (ESIPT) fluorophore of 2-(benzo[d]thiazol-2-yl)-4-(pyren-1-yl)phenol (PyHBT) with the typical characteristic properties of a hot exciton is developed. With high efficiency of utilization of the exciton (91%), its yellow OLED exhibited high external quantum efficiency (EQE) of 5.6%, current efficiency (CE) of 16.8 cd A-1 , and power efficiency (PE) of 17.3 lm W-1 . The performance of the yellow emissive "hot exciton" ESIPT fluorophores is among the highest recorded. Due to the large Stokes shift of the ESIPT emitter, non-energy-transferred high-performance white OLEDs (WOLEDs) are developed, which are reproducible and highly efficient. This is possible because of the independent harvesting of most of the triplets in both complementary-color emitters without the interference of energy transfer. The PyHBT-based WOLEDs exhibit a maximum EQE of 14.3% and CE of 41.1 cd A-1 , which facilitates the high-yield mass production of inexpensive WOLEDs.
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