Unified Framework for Photophysical Rate Calculations in TADF Molecules

Leonardo Evaristo de Sousa, Piotr de Silva*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

One of the challenges in organic light-emitting diodes research is finding ways to increase device efficiency by making use of the triplet excitons that are inevitably generated in the process of electroluminescence. One way to do so is by thermally activated delayed fluorescence (TADF), a process in which triplet excitons undergo upconversion to singlet states, allowing them to relax radiatively. The discovery of this phenomenon has ensued a quest for new materials that are able to effectively take advantage of this mechanism. From a theoretical standpoint, this requires the capacity to estimate the rates of the various processes involved in the photophysics of candidate molecules, such as intersystem crossing, reverse intersystem crossing, fluorescence, and phosphorescence. Here, we present a method that is able to, within a single framework, compute all of these rates and predict the photophysics of new molecules. We apply the method to two TADF molecules and show that results compare favorably with other theoretical approaches and experimental results. Finally, we use a kinetic model to show how the calculated rates act in concert to produce different photophysical behavior.
Original languageEnglish
JournalJournal of Chemical Theory and Computation
Volume17
Issue number9
Pages (from-to)5816-5824
Number of pages9
ISSN1549-9618
DOIs
Publication statusPublished - 2021

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