Highly Efficient Near‐Infrared Organic Light‐Emitting Diode Based on a Butterfly‐Shaped Donor–Acceptor Chromophore with Strong Solid‐State Fluorescence and a Large Proportion of Radiative Excitons
作者:Liang Yao、Shitong Zhang、Rong Wang、Weijun Li、Fangzhong Shen、Bing Yang、Yuguang Ma
DOI:10.1002/anie.201308486
日期:2014.2.17
The development of near‐infrared (NIR) organic light‐emitting diodes (OLEDs) is of growing interest. Donor–acceptor (D–A) chromophores have served as an important class of NIR materials for NIR OLED applications. However, the external quantum efficiencies (EQEs) of NIR OLEDs based on conventional D–A chromophores are typically below 1 %. Reported herein is a butterfly‐shaped D–A compound, PTZ‐BZP.
近红外(NIR)有机发光二极管(OLED)的开发受到越来越多的关注。供体-受体(D-A)生色团已成为NIR OLED应用中一类重要的NIR材料。但是,基于常规D–A发色团的NIR OLED的外部量子效率(EQE)通常低于1%。本文报道的是蝶形D–A化合物PTZ-BZP。PTZ-BZP薄膜显示出很强的近红外荧光,发射峰位于700 nm,相应的量子效率达到16%。值得注意的是,基于PTZ-BZP的NIR OLED的EQE为1.54%,观察到低效率的滚降以及48%的高辐射激子比,突破了传统荧光灯的25%极限OLED。