系统间交叉
共发射极
荧光
材料科学
光致发光
共振(粒子物理)
有机发光二极管
光电子学
纳米技术
物理
激发态
单重态
光学
粒子物理学
核物理学
图层(电子)
作者
Xiugang Wu,Bo Su,Deng‐Gao Chen,Denghui Liu,Chi Chi Wu,Zhi Huang,Tzu Chen Lin,Cheng Ham Wu,Mengbing Zhu,Elise Y. Li,Wen Yi Hung,Weiguo Zhu,Pi‐Tai Chou
出处
期刊:Nature Photonics
[Springer Nature]
日期:2021-09-28
卷期号:15 (10): 780-786
被引量:125
标识
DOI:10.1038/s41566-021-00870-3
摘要
Research into organic light emitters employing multiple resonance-induced thermally activated delayed fluorescence (MR-TADF) materials is presently attracting a great deal of attention due to the potential for efficient deep-blue emission. However, the origins and mechanisms of successful TADF are unclear, as many MR-TADF materials do not show TADF behaviour in solution, but only as particular pure solids. Here, an investigation into a well-known MR-TADF material, DABNA-1, together with other new MR materials (9H-quinolino[3,2,1-kl]phenothiazin-9-one (QPO) and 9H-quinolino-[3,2,1-kl]-phenothiazin-9-one 5,5-dioxide (QP3O)), yields new insights regarding the origin of TADF. Although a material system may support the concept of MR, inefficiency in both forward and reverse intersystem crossings forbids TADF unless a suitable host material allows an exciplex-like host–emitter interaction that boosts TADF. This boosted-TADF mechanism can be generalized to any fluorescence dye that lacks TADF in the photoluminescence measurement but has a thermally accessible S1–T1 energy gap, opening the way to high-performance organic light-emitting diodes.
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