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Identifying the factors that lead to PLQY enhancement in diluted TADF exciplexes based on carbazole donors.

Colella, Marco and Danos, Andrew and Monkman, Andrew P. (2019) 'Identifying the factors that lead to PLQY enhancement in diluted TADF exciplexes based on carbazole donors.', Journal of physical chemistry C., 123 (28). pp. 17318-17324.

Abstract

Here we compare the effects of solid-state dilution on the photophysical and electrical performance of three TADF exciplexes based on carbazole containing donors with a high-performance acceptor PO-T2T. We observe intrinsically different photophysical behaviour between the exciplexes, which is explained by the presence of a heterogeneous distribution of triplet energies in one of the donor molecules arising from a distribution of planar and highly twisted biphenyl bridges. This study of different donors demonstrates that the recently discovered efficiency enhancement of solid-state diluted exciplexes is independent of the separation associated spectral blueshift, with the latter being universal while the former is only found for donors with low structural rigidity. OLEDs produced from these carbazole based exciplexes show decreased electrical performance likely due to the relatively low conductivity of the donors and host, suggesting that functional conductive hosts may, in some cases, be required to translate optical efficiency enhancements into improved electrical performance.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acs.jpcc.9b03538
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.9b03538
Date accepted:No date available
Date deposited:02 July 2019
Date of first online publication:25 June 2019
Date first made open access:25 June 2020

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