有机发光二极管
材料科学
系统间交叉
光电子学
电致发光
量子效率
三苯胺
发光
光致发光
二极管
红外线的
光学
纳米技术
单重态
物理
激发态
核物理学
图层(电子)
作者
Ruming Jiang,Zhangshan Liu,Tao Yang,Dezhi Yang,Dongge Ma,Ben Zhong Tang,Zujin Zhao
标识
DOI:10.1002/adom.202302034
摘要
Abstract Robust organic luminescent materials radiating deep‐red/near‐infrared (DR/NIR) light are highly desired in organic light‐emitting diodes (OLEDs). However, most reported DR/NIR materials show only moderate electroluminescence (EL) efficiencies accompanied by rock‐ribbed efficiency roll‐offs, which immensely limit their practical use in OLEDs. In this work, two tailor‐made NIR luminescent materials with thermally activated delayed fluorescence (TADF) property are developed based on rigid and strong electron‐accepting core of 2,7‐bis(4‐cyanophenyl)dibenzo[ a , c ]phenazine‐11,12‐dicarbonitrile and electron donors of triphenylamine or N , N ‐di([1,1′‐biphenyl]‐4‐yl)phenylamine. They exhibit high photoluminescence quantum yields, fast reverse intersystem crossing processes and large horizontal dipole ratios. Their nondoped OLEDs show NIR lights with maximum external quantum efficiencies ( η ext,maxS ) of 0.59% at 856 nm and 1.14% at 850 nm. And their doped OLEDs radiate DR to NIR lights (646–737 nm) and attain superb η ext,max s of up to 30.3% at 646 nm with small efficiency roll‐offs. The state‐of‐the‐art EL performances of both NIR TADF materials demonstrate their high potential as emitters in OLEDs and the insights gained in this work will enlighten the further development of efficient NIR luminescent materials.
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