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Thermally activated delayed fluorescence mediated through the upper triplet state manifold in non-charge-transfer star-shaped triphenylamine–carbazole molecules.

Pander, Piotr and Motyka, Radoslaw and Zassowski, Pawel and Etherington, Marc K. and Varsano, Daniele and da Silva, Tales J. and Caldas, Marilia J. and Data, Przemyslaw and Monkman, Andrew P. (2018) 'Thermally activated delayed fluorescence mediated through the upper triplet state manifold in non-charge-transfer star-shaped triphenylamine–carbazole molecules.', Journal of physical chemistry C., 122 (42). pp. 23934-23942.

Abstract

Thermally activated delayed fluorescence has been found in a group of tricarbazolylamines that are purely electron-donating, non-charge-transfer (CT) molecules. We show that the reverse intersystem crossing step in these materials is mediated through upper triplet states. Reverse internal conversion is shown to be the thermally activated mechanism behind the triplet harvesting mechanism. The strongly mixed n−π*/π–π* character of the lowest energy optical transitions retains high oscillator strength and gives rise to high ΦPL. Organic light-emitting diode devices using these materials were fabricated to show very narrow (full width at half-maximum = 38–41 nm) electroluminescence spectra, clearly demonstrating the excitonic nature of the excited states. This new combination of physicochemical properties of a non-CT molecule yields thermally activated delayed fluorescence, but via a different, physical mechanism, reverse internal conversion delayed fluorescence.

Item Type:Article
Full text:Publisher-imposed embargo until 28 September 2019.
(AM) Accepted Manuscript
First Live Deposit - 16 November 2018
File format - PDF
(1166Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acs.jpcc.8b07610
Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of physical chemistry C copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.8b07610
Record Created:16 Nov 2018 13:43
Last Modified:16 Nov 2018 16:26

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