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| TITLE | Temperature dependency of energy shift of excitonic states in a donor–acceptor type TADF molecule |
|---|---|
| AUTHOR | Youichi Tsuchiya, Keito Mizukoshi, Masaki Saigo, Tomohiro Ryu, Keiko Kusuhara, Kiyoshi Miyata, Ken Onda & Chihaya Adachi |
| YEAR | 2025 |
| JOURNAL | Nature Communications |
| ABSTRACT |
In recent years, thermally activated delayed fluorescence (TADF) has attracted intense attention owing to its straightforward application to high-efficiency organic light-emitting diodes. Further, to develop high-performance TADF materials, many researchers have designed novel molecules that have a small energy gap between the lowest excited singlet and triplet states, and detailed analysis suggests a significant contribution of higher-lying excited states for spin flipping processes. In this study, we demonstrate a peculiar thermal behaviour of emission decay of a donor–acceptor type TADF molecule, TMCz-BO, which seems like thermal deactivation of delayed fluorescence that can be explained without a negative by comprehensive kinetic analysis across various temperatures and solvents. While the activation energy has previously been treated as being temperature-independent, we stress that it should be a dynamic parameter affected by changing the solvent-solute interaction with the environmental temperature, especially in the case of a small energy gap. |
| FULL ARTICLE | https://www.nature.com/articles/s41467-025-59910-z |
| INSTRUMENT | FP-8600 |
| KEYWORDS | Electronic devices, Organic LEDs |
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