电致发光
有机发光二极管
材料科学
二苯基氧化膦
光电子学
半最大全宽
窄带
光致发光
单重态
激发态
共发射极
二极管
激子
光化学
光学
化学
原子物理学
纳米技术
物理
高分子化学
图层(电子)
量子力学
作者
Jinkun Bian,Su Chen,Lili Qiu,Nan Zhang,Jing Zhang,Chunbo Duan,Chunmiao Han,Hui Xu
出处
期刊:Research
[AAAS00]
日期:2022-01-01
卷期号:2022
被引量:5
标识
DOI:10.34133/2022/9838120
摘要
Multiresonance (MR) emitters featuring narrowband emissions and theoretically 100% exciton harvesting are great potential for organic light-emitting diode (OLED) applications. However, how to functionalize MR molecules without scarifying emission color purity is still a key challenge. Herein, we report a feasible strategy for selective optimization of MR molecules, which is demonstrated by a blue MR emitter tCBNDASPO substituted with a diphenylphosphine oxide (DPPO) group. Compared to its DPPO-free parent molecule, tCBNDASPO preserves narrowband feature with full widths at half maximum (FWHM) values of 28 nm in film and 32 nm in OLEDs and achieves 40% increased photoluminescence (92%) and electroluminescence quantum efficiencies (28%). It is showed that insulation effect of P=O effectively confines the singlet excited state on MR core to keep emission color purity, and its induction effect enhances singlet radiation and triplet-to-singlet conversion. This synergism for selective optimization is based on rational linkage between MR core and functional groups.
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