Solvent-dependent dual emission processes in charge-transfer excited states of phenothiazine-triphenyltriazine conformers

30 May 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


We have investigated the solvent effects on charge-transfer excited states in a donor-acceptor type luminescent material, phenothiazine-triphenyltriazine (PTZ-TRZ), which has characteristic two conformers: quasi-axial and quasi-equatorial conformers. Solvent permittivity dependence of steady-state photoluminescence spectra using mixture solvents of toluene and tetrahydrofuran (THF) indicated that the two conformers have almost the same excited-state dipole moments. Time-resolved photoluminescence and transient absorption spectra in toluene and THF showed a different solvent dependence between the two conformers. From the detailed analysis of these time-resolved spectra, we revealed the solvent-dependent emission processes in the two conformers.


charge transfer state
time-resolved spectroscopy
luminescent material


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