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

dos Santos, Paloma L.; Etherington, Marc K.; Monkman, Andrew P.

doi:10.1039/c8tc00991k

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

dos Santos, Paloma L.; Etherington, Marc K.; Monkman, Andrew P.

Authors

Paloma L. dos Santos

Marc K. Etherington

Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor

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.

Citation

dos Santos, P. L., Etherington, M. K., & Monkman, A. P. (2018). Chemical and conformational control of the energy gaps involved in the thermally activated delayed fluorescence mechanism. Journal of Materials Chemistry C Materials for optical and electronic devices, 6(18), 4842-4853. https://doi.org/10.1039/c8tc00991k

Journal Article Type	Article
Acceptance Date	Apr 18, 2018
Online Publication Date	Apr 18, 2018
Publication Date	2018-05
Deposit Date	Apr 27, 2018
Publicly Available Date	Apr 9, 2021
Journal	Journal of Materials Chemistry C Materials for optical and electronic devices
Print ISSN	2050-7526
Electronic ISSN	2050-7534
Publisher	Royal Society of Chemistry
Peer Reviewed	Peer Reviewed
Volume	6
Issue	18
Pages	4842-4853
DOI	https://doi.org/10.1039/c8tc00991k