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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)780-786
Number of pages7
JournalNature Photonics
Issue number10
Publication statusPublished - 2021 Oct

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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