Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data

Sem, Stefano; Jenatsch, Sandra; Stavrou, Kleitos; Danos, Andrew; Monkman, Andrew P.; Ruhstaller, Beat

doi:10.1039/d1tc05594a

Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data

Sem, Stefano; Jenatsch, Sandra; Stavrou, Kleitos; Danos, Andrew; Monkman, Andrew P.; Ruhstaller, Beat

Authors

Stefano Sem

Sandra Jenatsch

Kleitos Stavrou kleitos.stavrou@durham.ac.uk
PGR Student Doctor of Philosophy

Dr Andrew Danos andrew.danos@durham.ac.uk
Academic Visitor

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

Beat Ruhstaller

Abstract

Thermally-activated delayed fluorescence (TADF) compounds are promising materials used in emissive layers of organic light-emitting diodes (OLEDs). Their main benefit is that they allow the internal quantum efficiency of the OLED to reach up to 100% by converting non-radiative triplet states into radiative singlets. Besides the importance of having a high reverse intersystem-crossing rate, which governs triplet conversion, minimizing the non-radiative decay processes is also extremely important to reach high efficiency. In this study we provide a new method to quantify not only the most important decay rates involved in the TADF process, but also the non-radiative decay rates of both singlet and triplet states individually from transient and steady state experimental optical data. In addition, the different contribution that the two non-radiative decay pathways have on the internal quantum efficiency is investigated. Finally, the method is applied to experimental data from two TADF materials.

Citation

Sem, S., Jenatsch, S., Stavrou, K., Danos, A., Monkman, A. P., & Ruhstaller, B. (2022). Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(12), 4878-4885. https://doi.org/10.1039/d1tc05594a

Journal Article Type	Article
Acceptance Date	Jan 25, 2022
Online Publication Date	Feb 14, 2022
Publication Date	Mar 28, 2022
Deposit Date	Mar 15, 2022
Publicly Available Date	Mar 15, 2022
Journal	Journal of Materials Chemistry C Materials for optical and electronic devices
Print ISSN	2050-7526
Electronic ISSN	2050-7534
Publisher	Royal Society of Chemistry
Peer Reviewed	Peer Reviewed
Volume	10
Issue	12
Pages	4878-4885
DOI	https://doi.org/10.1039/d1tc05594a
Public URL	https://durham-repository.worktribe.com/output/1215354