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Intramolecular Charge Transfer Controls Switching Between Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence

Chen, Chengjian; Huang, Ronjguan; Batsanov, Andrei; Pander, Piotr; Hsu, Yu-Ting; Chi, Zhenguo; Dias, Fernando; Bryce, Martin Robert

Intramolecular Charge Transfer Controls Switching Between Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence Thumbnail


Authors

Chengjian Chen

Ronjguan Huang

Andrei Batsanov

Yu-Ting Hsu

Zhenguo Chi



Abstract

Chemical modification of phenothiazine–benzophenone derivatives is shown to tune the emission behavior from triplet states by selecting the molecular geometry of the intramolecular charge transfer (ICT) state. A fundamental principle of planar ICT (PICT) and twisted ICT (TICT) is demonstrated to obtain selectively either room temperature phosphorescence (RTP) or highly efficient thermally activated delayed fluorescence (TADF), respectively. Time‐resolved spectroscopy and time‐dependent density functional theory (TD‐DFT) investigations on polymorphic single crystals demonstrate the roles of PICT and TICT states in the underlying photophysics. This has resulted in a RTP molecule OPM, where the triplet states contribute with 89% of the luminescence, and an isomeric TADF molecule OMP, where the triplet states contribute with 95% of the luminescence.

Citation

Chen, C., Huang, R., Batsanov, A., Pander, P., Hsu, Y., Chi, Z., …Bryce, M. R. (2018). Intramolecular Charge Transfer Controls Switching Between Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence. Angewandte Chemie, 130(50), 16645-16649. https://doi.org/10.1002/ange.201809945

Journal Article Type Article
Acceptance Date Oct 18, 2018
Online Publication Date Nov 15, 2018
Publication Date Dec 10, 2018
Deposit Date Oct 29, 2018
Publicly Available Date Mar 29, 2024
Journal Angewandte Chemie
Print ISSN 0044-8249
Electronic ISSN 1521-3757
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 130
Issue 50
Pages 16645-16649
DOI https://doi.org/10.1002/ange.201809945

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Copyright Statement
This is the peer reviewed version of the following article: Chen, Chengjian, Huang, Ronjguan, Batsanov, Andrei, Pander, Piotr, Hsu, Yu-Ting, Chi, Zhenguo, Dias, Fernando & Bryce, Martin Robert (2018). Intramolecular Charge Transfer Controls Switching Between Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence. Angewandte Chemie 130(50): 16645-16649, which has been published in final form at https://doi.org/10.1002/ange.201809945. This article may be used for non-commercial purposes in accordance With Wiley-VCH Terms and Conditions for self-archiving.





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