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

154 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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10.1038/s41566-021-00870-3

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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 - Huang, Zhi Xuan

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AU - Wu, Cheng Ham

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AU - Zhu, Weiguo

AU - Chou, Pi Tai

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

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