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Using Guest–Host Interactions To Optimize the Efficiency of TADF OLEDs

dos Santos, Paloma L.; Ward, Jonathan S.; Bryce, Martin R.; Monkman, Andrew P.

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Authors

Paloma L. dos Santos

Jonathan S. Ward



Abstract

We show that the emitter and host combination must be optimized to minimize the reverse intersystem crossing (rISC) barrier and maximize thermally activated delayed fluorescence (TADF). The blue TADF emitter, 2,7-bis(9,9-dimethyl-acridin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DDMA-TXO2), has strong TADF character due to efficient charge transfer (CT) state formation. By combining DDMA-TXO2 with a host of correct polarity (DPEPO) that relaxes the CT manifolds’ energy to become resonant with the lowest-energy local triplet state of DDMA-TXO2, the emitter and host combination produce a minimum rISC barrier (ΔEST), which maximizes TADF efficiency. We show that the sensitivity of these splittings is highly dependent on emitter environment and must be carefully tuned to optimize device performance. Devices utilizing DDMA-TXO2 in the DPEPO host show blue electroluminescence (EL), with commission internationale de l’éclairage (CIE) chromaticity coordinates of CIE (0.16, 0.24), with a maximum external quantum efficiency of 22.4%. This high device performance is a direct consequence of optimizing the TADF efficiency by this “host tuning”.

Citation

dos Santos, P. L., Ward, J. S., Bryce, M. R., & Monkman, A. P. (2016). Using Guest–Host Interactions To Optimize the Efficiency of TADF OLEDs. Journal of Physical Chemistry Letters, 2016(7), 3341-3346. https://doi.org/10.1021/acs.jpclett.6b01542

Journal Article Type Article
Acceptance Date Aug 9, 2016
Online Publication Date Aug 9, 2016
Publication Date Aug 9, 2016
Deposit Date Aug 30, 2016
Publicly Available Date Mar 29, 2024
Journal Journal of Physical Chemistry Letters
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 2016
Issue 7
Pages 3341-3346
DOI https://doi.org/10.1021/acs.jpclett.6b01542

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in The 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 http://dx.doi.org/10.1021/acs.jpclett.6b01542.





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