电致发光
分子内力
光化学
有机发光二极管
材料科学
荧光
兴奋剂
分子
光电子学
偶极子
光致发光
量子效率
化学
光学
纳米技术
立体化学
有机化学
物理
图层(电子)
作者
Zheyi Cai,Xing Wu,Hao Liu,Jingjing Guo,Dezhi Yang,Dongge Ma,Zujin Zhao,Ben Zhong Tang
标识
DOI:10.1002/ange.202111172
摘要
Abstract Tailor‐made red thermally activated delayed fluorescence (TADF) molecules comprised of an electron‐withdrawing pyrazino[2,3‐f][1,10]phenanthroline‐2,3‐dicarbonitrile core and various electron‐donating triarylamines are developed. They can form intramolecular hydrogen‐bonding, which is conducive to improving emission efficiency and promoting horizontal orientation and show near infrared (NIR) emissions (692–710 nm) in neat films and red delayed fluorescence (606–630 nm) with high photoluminescence quantum yields (73–90%) in doped films. They prefer horizontal orientation with large horizontal dipole ratios in films, rendering high optical out‐coupling factors (0.39–0.41). Their non‐doped OLEDs exhibit NIR lights (716–748 nm) with maximum external quantum efficiencies ( η ext,max ) of 1.0–1.9%. And their doped OLEDs radiate red lights (606–648 nm) and achieve record‐beating η ext,max of up to 31.5%. These new red TADF materials should have great potentials in display and lighting devices.
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