October 5, 2025

Study of the thermally-activated delayed fluorescence (TADF) mechanism of phenothiazine-dibenzothiophene-

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Rapid charge separation (about 7.6 ps) occurs in non-oxidized compounds, while oxidized compounds exhibit slower charge separation (10.9 ps).
Transient absorption spectroscopy confirmed the coexistence of 3CS and 3LE states, indicating that heavy atom effects do not enhance RISC rates.
The oxidation of the phenothiazine unit increases charge separated state energy, resulting in exclusive observation of the 3LE state.
Spectroscopy findings suggest that the triplet state is likely formed via spin-orbit charge transfer intersystem crossing.

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Experimental analysis reveals RISC mechanisms in electron donor-acceptor systems, suggesting limitations of heavy atom effects.

Pei et al. (2025) studied this question.

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