Exact solution of kinetic analysis for thermally activated delayed fluorescence materials
Abstract
The photophysical analysis of thermally activated delayed fluorescence (TADF) materials has become instrumental to providing insight into their stability and performance, which is not only relevant for organic light-emitting diodes (OLED), but also for other applications such as sensing, imaging and photocatalysis. Thus, a deeper understanding of the photophysics underpinning the TADF mechanism is required to push materials design further. Previously reported analyses in the literature of the kinetics of the various processes occurring in a TADF material rely on several a priori assumptions to estimate the rate constants for forward and reverse intersystem crossing (ISC and RISC, respectively). In this report, we demonstrate a method to determine these rate constants using a three-state model together with a steady-state approximation and, importantly, no additional assumptions. Further, we derive the exact rate equations, greatly facilitating a comparison of the TADF properties of structurally diverse emitters and providing a comprehensive understanding of the photophysics of these systems.
Citation
Tsuchiya , Y , Diesing , S , Bencheikh , F , Wada , Y , dos Santos , P L , Kaji , H , Zysman-Colman , E , Samuel , I D W & Adachi , C 2021 , ' Exact solution of kinetic analysis for thermally activated delayed fluorescence materials ' , Journal of Physical Chemistry A , vol. Articles ASAP . https://doi.org/10.1021/acs.jpca.1c04056
Publication
Journal of Physical Chemistry A
Status
Peer reviewed
ISSN
1089-5639Type
Journal article
Description
Research at Kyushu, Kyoto and St Andrews Universities was supported by EPSRC and JSPS Core to Core grants (JSPS Core-to-core Program; EPSRC grant number EP/R035164/1). Authors are also grateful for financial support from the Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology, Japan, JST ERATO Grant JPMJER1305, JSPS KAKENHI JP20H05840, and Kyulux Inc.Collections
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