Optimizing Optoelectronic Properties of Pyrimidine-Based TADF Emitters by Changing the Substituent for Organic Light-Emitting Diodes with External Quantum Efficiency Close to 25 % and Slow Efficiency Roll-Off
作者:Kailong Wu、Tao Zhang、Lisi Zhan、Cheng Zhong、Shaolong Gong、Nan Jiang、Zheng-Hong Lu、Chuluo Yang
DOI:10.1002/chem.201601686
日期:2016.7.25
triplet states while maintaining frontier molecular orbital levels, and thereby optimizing their optoelectronic properties. Employing these TADF emitters results in a green fluorescent organic light‐emitting diode (OLED) that exhibits a peak forward‐viewing external quantum efficiency (EQE) close to 25 % and a slow efficiency roll‐off characteristic at high luminance.
通过将电子给体(D)吩恶嗪单元和电子受体(A)2取代的嘧啶部分整合到其中,开发了一系列绿色的蝴蝶形热激活延迟荧光(TADF)发射器,即PXZPM,PXZMePM和PXZPhPM。一个分子通过苯基桥π键形成D–π–A–π–D配置。在这些发射体中改变嘧啶单元的取代基可以精细地调整其发射特性,热性质以及单线态和三线态之间的能隙,同时保持前沿的分子轨道能级,从而优化其光电性能。使用这些TADF发射器可产生绿色荧光有机发光二极管(OLED),该二极管的峰值前视外部量子效率(EQE)接近25%,并且在高亮度下具有缓慢的效率下降特性。