Less Is More: Dilution Enhances Optical and Electrical Performance of a TADF Exciplex

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

doi:10.1021/acs.jpclett.8b03646

Less Is More: Dilution Enhances Optical and Electrical Performance of a TADF Exciplex

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

Authors

Marco Colella

Dr Andrew Danos andrew.danos@durham.ac.uk
Senior Experimental Officer

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

Abstract

A surprising yet highly practical approach to improve the performance of a TADF exciplex blend is reported. Using the TSBPA donor and PO-T2T acceptor to form an exciplex, we are able to blue shift the emission, increase PLQY from 58 to 80%, and increase the device EQE from 14.8 to 19.2% by simply diluting the exciplex with an inert high triplet energy host material—here either UGH-3 or DPEPO. These effects are explained in terms of an increasing donor–acceptor distance and associated charge separation, while different behaviors observed in the different hosts are attributed to different energy barriers to electron transfer through the host. We expect that the observed performance-enhancing effects of dilution will be general to different exciplex blends and host materials and offer a new way to optimize the electrical properties of exciplex emission layers with narrow blue emission.

Citation

Colella, M., Danos, A., & Monkman, A. P. (2019). Less Is More: Dilution Enhances Optical and Electrical Performance of a TADF Exciplex. Journal of Physical Chemistry Letters, 10(4), 793-798. https://doi.org/10.1021/acs.jpclett.8b03646

Journal Article Type	Article
Acceptance Date	Feb 6, 2019
Online Publication Date	Feb 6, 2019
Publication Date	Feb 21, 2019
Deposit Date	Apr 8, 2021
Publicly Available Date	Apr 9, 2021
Journal	Journal of Physical Chemistry Letters
Publisher	American Chemical Society
Peer Reviewed	Peer Reviewed
Volume	10
Issue	4
Pages	793-798
DOI	https://doi.org/10.1021/acs.jpclett.8b03646

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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 letters, 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.jpclett.8b03646.