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Issue 18, 2018
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Chemical and conformational control of the energy gaps involved in the thermally activated delayed fluorescence mechanism

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Abstract

This review summarises the significant developments in our understanding and control of thermally-activated delayed fluorescence (TADF) molecules and the spin–vibronic coupling mechanism, from which we have designed new generations of emitters. It covers both the theoretical and experimental characterization of the physical and chemical aspects of model TADF emitters. We focus on how to correctly obtain the singlet–triplet energy gaps (ΔEST) that must be overcome by the triplet excited states in the reverse intersystem crossing (rISC) process, highlighting the differences between: the ΔEST estimated from the energy difference between the fluorescence and phosphorescence (1CT–3LE gap); and the activation energy (Ea) estimated from the Arrhenius plot (1CT–3CT gap). The discussion considers the different external factors and design principles that can influence these energy gaps and ultimately the device performance.

Graphical abstract: Chemical and conformational control of the energy gaps involved in the thermally activated delayed fluorescence mechanism

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Publication details

The article was received on 27 Feb 2018, accepted on 18 Apr 2018 and first published on 18 Apr 2018


Article type: Review Article
DOI: 10.1039/C8TC00991K
Citation: J. Mater. Chem. C, 2018,6, 4842-4853
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    Chemical and conformational control of the energy gaps involved in the thermally activated delayed fluorescence mechanism

    P. L. dos Santos, M. K. Etherington and A. P. Monkman, J. Mater. Chem. C, 2018, 6, 4842
    DOI: 10.1039/C8TC00991K

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