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Exact Solution of Kinetic Analysis for Thermally Activated Delayed Fluorescence Materials

preprint
revised on 30.04.2021, 06:29 and posted on 30.04.2021, 06:43 by Youichi Tsuchiya, Stefan Diesing, Fatima Bencheikh, Yoshimasa Wada, Paloma dos Santos, Hironori Kaji, Eli Zysman-Colman, Ifor Samuel, Chihaya Adachi
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.

Funding

the Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology, Japan

JST ERATO Grant JPMJER1305

JSPS Core-to-core Program

Kyulux. Inc.

the EPSRC (EP/P010482/1, EP/R035164/1)

History

Email Address of Submitting Author

adachi@cstf.kyushu-u.ac.jp

Institution

Kyushu Univerisity

Country

JAPAN

ORCID For Submitting Author

0000-0001-6117-9604

Declaration of Conflict of Interest

No conflict of interest

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