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

doi:10.1038/s41566-021-00870-3

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

218 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	780-786
Number of pages	7
Journal	Nature Photonics
Volume	15
Issue number	10
DOIs	https://doi.org/10.1038/s41566-021-00870-3
Publication status	Published - 2021 Oct

ASJC Scopus subject areas

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

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Cite this

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title = "The role of host–guest interactions in organic emitters employing MR-TADF",

abstract = "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.",

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

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AU - Wu, Cheng Ham

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

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