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.
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.
| Item Type: | Article |
|---|---|
| Full text: | (AM) Accepted Manuscript Available under License - Creative Commons Attribution Non-commercial 3.0. Download PDF (2769Kb) |
| Status: | Peer-reviewed |
| 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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