四配位
系统间交叉
有机发光二极管
量子效率
荧光
光致发光
材料科学
光化学
激子
光电子学
量子产额
发光
硼
化学
纳米技术
光学
原子物理学
激发态
物理
有机化学
计算机图形学(图像)
图层(电子)
量子力学
计算机科学
单重态
平面的
作者
Ling Zhou,Fan Ni,Nan Li,Kai Wang,Guohua Xie,Chuluo Yang
标识
DOI:10.1002/ange.202203844
摘要
Abstract Purely organic emitters have shown great potential but still suffer from low efficiency in near‐infrared organic light‐emitting diodes (NIR‐OLEDs) due to the intensive non‐radiative recombination. In this contribution, two pairs of thermally activated delayed fluorescence (TADF) enantiomers ( R / S‐ DOBP and R / S‐ HDOBP) with tetracoordinate boron geometries were designed and synthesized. The TADF emitters simultaneously showed aggregation‐induced emission, circularly polarized luminescence, high‐contrast mechanochromism, and piezochromism behaviors. More importantly, R / S‐ DOBP and R / S‐ HDOBP revealed high photoluminescence quantum yields and efficient reverse intersystem crossing in neat films. The nondoped solution‐processed OLEDs based on these unique emitters revealed the NIR emission (peaking at 716 nm) with a maximum external quantum efficiency of 1.9 % and high exciton utilization efficiency of 86 %, which represent one of the best solution‐processed nondoped NIR‐OLEDs.
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