二苯胺
材料科学
量子效率
蒽
咔唑
光电子学
系统间交叉
量子产额
荧光
共发射极
聚芴
硼
电致发光
光化学
有机发光二极管
纳米技术
光学
化学
原子物理学
有机化学
图层(电子)
单重态
冶金
激发态
物理
作者
Jinho Park,Jong Tae Lim,Jin Ho Lee,Beomsu Jang,Ju Hee Han,Seung Soo Yoon,Jun Yeob Lee
标识
DOI:10.1021/acsami.1c11399
摘要
In this study, we synthesized and characterized multiple resonance (MR) type blue thermally activated delayed fluorescence (TADF) emitters. Unlike many boron-based MR-TADF materials, the blue TADF emitters of this work had an asymmetric molecular structure with one boron, one oxygen, and one nitrogen. The aromatic units linked to the nitrogen were changed into diphenylamine, carbazole, dimethylacridine, and diphenylacridine to manage the light emission properties of the emitters. The TADF emitters exhibited a blue emission due to the weak electron-donating oxygen atom and the emission color was controlled by the aromatic unit connected to the nitrogen. The simple diphenylamine unit was effective in achieving real deep-blue emission for the BT2020 standard with a high external quantum efficiency (EQE), while the electron-rich nitrogen-based dimethylacridine and diphenylacridine accelerated the reverse intersystem crossing for high EQE and small EQE roll-off. Among the emitters, a diphenylamine-substituted emitter, 7-(tert-butyl)-9-phenyl-9H-5-oxa-9-aza-13b-boranaphtho[3,2,1-de]anthracene (B-O-dpa), showed a maximum external quantum efficiency of 16.3%, a small full width at half-maximum of 32 nm, and a real deep-blue color coordinate of (0.15, 0.05).
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