Sem, Stefano and Jenatsch, Sandra and Stavrou, Kleitos and Danos, Andrew and Monkman, Andrew P. and Ruhstaller, Beat (2022) 'Determining non-radiative decay rates in TADF compounds using coupled transient and steady state optical data.', Journal of materials chemistry C., 10 (12). pp. 4878-4885.
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.
|Full text:||(AM) Accepted Manuscript|
Available under License - Creative Commons Attribution Non-commercial 3.0.
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|Publisher Web site:||https://doi.org/10.1039/D1TC05594A|
|Publisher statement:||This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence|
|Date accepted:||25 January 2022|
|Date deposited:||15 March 2022|
|Date of first online publication:||14 February 2022|
|Date first made open access:||15 March 2022|
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