Issue 12, 2022

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

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.

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

Article information

Article type
Paper
Submitted
19 11 2021
Accepted
25 1 2022
First published
14 2 2022
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2022,10, 4878-4885

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

S. Sem, S. Jenatsch, K. Stavrou, A. Danos, A. P. Monkman and B. Ruhstaller, J. Mater. Chem. C, 2022, 10, 4878 DOI: 10.1039/D1TC05594A

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