The role of host–guest interactions in organic emitters employing MR-TADF

Xiugang Wu, Bo Kang Su, Deng Gao Chen, Denghui Liu, Chi Chi Wu, Zhi Xuan Huang, Ta Chun Lin, Cheng Ham Wu, Mengbing Zhu, Elise Y. Li, Wen Yi Hung, Weiguo Zhu*, Pi Tai Chou

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

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.

原文英語
頁(從 - 到)780-786
頁數7
期刊Nature Photonics
15
發行號10
DOIs
出版狀態已發佈 - 2021 十月

ASJC Scopus subject areas

  • 電子、光磁材料
  • 原子與分子物理與光學

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