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Identifying the Factors That Lead to PLQY Enhancement in Diluted TADF Exciplexes Based on Carbazole Donors

Colella, Marco; Danos, Andrew; Monkman, Andrew P.

Identifying the Factors That Lead to PLQY Enhancement in Diluted TADF Exciplexes Based on Carbazole Donors Thumbnail


Authors

Marco Colella



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.

Citation

Colella, M., Danos, A., & Monkman, A. 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), 17318-17324. https://doi.org/10.1021/acs.jpcc.9b03538

Journal Article Type Article
Online Publication Date Jun 25, 2019
Publication Date Jul 18, 2019
Deposit Date Jul 2, 2019
Publicly Available Date Jun 25, 2020
Journal Journal of Physical Chemistry C
Print ISSN 1932-7447
Electronic ISSN 1932-7455
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 123
Issue 28
Article Number 17318-17324
Pages 17318-17324
DOI https://doi.org/10.1021/acs.jpcc.9b03538

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Accepted Journal Article (711 Kb)
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Copyright 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





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