Singlet–triplet splitting energy management for thermally activated delayed fluorescence emitters: up-conversion of acceptor triplet into charge transfer singlet state

Li, Bowen; Li, Zhiyi; Xia, Qing; Song, Xiangan; Chen, Daoyuan; Guo, Fengyun; Gao, Shiyong; Wang, Ying; Zhang, Yong

doi:10.1039/d2tc03123j

J. Mater. Chem. C

2022

DOI: 10.1039/d2tc03123j

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Singlet–triplet splitting energy management for thermally activated delayed fluorescence emitters: up-conversion of acceptor triplet into charge transfer singlet state

Bowen Li

Zhiyi Li

Qing Xia

et al.

Abstract: An energetic proximity between charge transfer singlet (1CT) and a local exciton triplet (3LE) is critical to facilitate reverse intersystem crossing rate and thus ultimately TADF. In this study, new...

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2024

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Cited by 4 publications

References 26 publications

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Prompt and Thermally Activated Delayed Fluorescence of Quinazoline‐Based Derivatives: A Joint Experimental and Theoretical Study

Hodée,

Moshkina,

Massue

et al. 2024

ChemPhotoChem

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During the last decade, thermally activated delayed fluorescence has been the topic of intense research due to its great potential for highly efficient all organic light emitting devices. While the quinazoline heterocycle has been used for its electron withdrawing ability in various push‐pull dyes, quinazoline derivatives have been rarely considered for TADF emitters. Here we design and synthesize a new series of dyes with phenyl‐ or methoxy‐substituted quinazoline rings combined with 9,9‐dimethylacridan, phenoxazine or phenothiazine and either 1,4‐phenylene or 2,5‐thienylene as linker. Combining optical spectroscopy and theoretical investigations, we demonstrate that delayed fluorescence is observed in the solid state for the phenyl‐substituted quinazoline derivatives for which both quasi‐equatorial and quasi‐axial conformations are predicted to coexist. Calculations further suggest that the reversed intersystem crossing is likely to involve the second triplet state that shows small energy splitting with the first singlet state. These results prompt further investigations of phenyl‐substituted quinazoline based dyes for TADF.

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Prompt and Thermally Activated Delayed Fluorescence of Quinazoline‐Based Derivatives: A Joint Experimental and Theoretical Study

Hodée,

Moshkina,

Massue

et al. 2024

ChemPhotoChem

View full text Add to dashboard Cite

show abstract

Trifluoromethyl enable high-performance single-emitter white organic light-emitting devices based on quinazoline acceptor

Song,

Shen,

et al. 2024

Chinese Chemical Letters

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Secondary donor-acceptor group enable efficient pure green organic light-emitting devices based on multi-resonance TADF emitters

Song,

Shen,

Zou

et al. 2024

Chemical Engineering Journal

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Singlet–triplet splitting energy management for thermally activated delayed fluorescence emitters: up-conversion of acceptor triplet into charge transfer singlet state

Abstract: An energetic proximity between charge transfer singlet (1CT) and a local exciton triplet (3LE) is critical to facilitate reverse intersystem crossing rate and thus ultimately TADF. In this study, new...

Cited by 4 publications

References 26 publications

Prompt and Thermally Activated Delayed Fluorescence of Quinazoline‐Based Derivatives: A Joint Experimental and Theoretical Study

Prompt and Thermally Activated Delayed Fluorescence of Quinazoline‐Based Derivatives: A Joint Experimental and Theoretical Study

Trifluoromethyl enable high-performance single-emitter white organic light-emitting devices based on quinazoline acceptor

Secondary donor-acceptor group enable efficient pure green organic light-emitting devices based on multi-resonance TADF emitters

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