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

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial 3.0.
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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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