Kinetic Modeling of Transient Photoluminescence from Thermally Activated Delayed Fluorescence

Haase, Nils; Danos, Andrew; Pflumm, Christof; Morherr, Antonia; Stachelek, Patrycja; Mekic, Amel; Brütting, Wolfgang; Monkman, Andrew P.

Abstract

A simplified state model and associated rate equations are used to extract the reverse intersystem crossing and other key rate constants from transient photoluminescence measurements of two high performance thermally activated delayed fluorescence materials. The values of the reverse intersystem crossing rate constant are in close agreement with established methods, but do not require a priori assumption of exponential decay kinetics, nor any additional steady state measurements. The model is also applied to measurements at different temperatures and found to reproduce previously reported thermal activation energies for the thermally activated delayed fluorescence process. Transient absorption measurements provide independent confirmation that triplet decay channels (neglected here) have no adverse effect on the fitting.

Citation

Haase, N., Danos, A., Pflumm, C., Morherr, A., Stachelek, P., Mekic, A., …Monkman, A. P. (2018). Kinetic Modeling of Transient Photoluminescence from Thermally Activated Delayed Fluorescence. Journal of Physical Chemistry C, 122(51), 29173-29179. https://doi.org/10.1021/acs.jpcc.8b11020

• Journal Article Type: Article
• Acceptance Date: Dec 3, 2018
• Online Publication Date: Dec 3, 2018
• Publication Date: Dec 27, 2018
• Deposit Date: Jan 8, 2020
• Publicly Available Date: Jan 8, 2020
• Journal: Journal of Physical Chemistry C
• Print ISSN: 1932-7447
• Electronic ISSN: 1932-7455
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 122
• Issue: 51
• Pages: 29173-29179
• DOI: https://doi.org/10.1021/acs.jpcc.8b11020
• Public URL: https://durham-repository.worktribe.com/output/1310849