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Donor, Acceptor, and Molecular Charge Transfer Emission All in One Molecule

Franca, Larissa G.; Danos, Andrew; Monkman, Andrew

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Abstract

The molecular photophysics in the thermally activated delayed fluorescence (TADF) spiro-acridine–anthracenone compound, ACRSA, is dominated by the rigid orthogonal spirocarbon bridging bond between the donor and acceptor. This critically decouples the donor and acceptor units, yielding photophysics, which includes (dual) phosphorescence and the molecular charge transfer (CT) states giving rise to TADF, that are dependent upon the excitation wavelength. The molecular singlet CT state can be directly excited, and we propose that supposed “spiro-conjugation” between acridine and anthracenone is more accurately an example of intramolecular through-space charge transfer. In addition, we show that the lowest local and CT triplet states are highly dependent upon spontaneous polarization of the environment, leading to energy reorganization of the triplet states, with the CT triplet becoming lowest in energy, profoundly affecting phosphorescence and TADF, as evident by a (thermally controlled) competition between reverse intersystem crossing and reverse internal conversion, i.e., dual delayed fluorescence (DF) mechanisms.

Citation

Franca, L. G., Danos, A., & Monkman, A. (2023). Donor, Acceptor, and Molecular Charge Transfer Emission All in One Molecule. Journal of Physical Chemistry Letters, 14(11), 2764-2771. https://doi.org/10.1021/acs.jpclett.2c03925

Journal Article Type Article
Acceptance Date Mar 3, 2023
Online Publication Date Mar 10, 2023
Publication Date Mar 23, 2023
Deposit Date Apr 27, 2023
Publicly Available Date Apr 27, 2023
Journal The Journal of Physical Chemistry Letters
Electronic ISSN 1948-7185
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 14
Issue 11
Pages 2764-2771
DOI https://doi.org/10.1021/acs.jpclett.2c03925
Public URL https://durham-repository.worktribe.com/output/1173900

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