Abstract
Abstract A simple method for determining of triplet-triplet extinction coefficients which is based on the non-linear effect in transitions between three levels of Jablonsky diagram has been suggested. Triplet concentrations were obtained from the expression N T st = C 0 (1 - τ r /τ d ), where τ r and τ d are the rise time and decay time of triplet concentrations respectively, C 0 is the ground state concentration of solute molecules. The triplet-triplet extinction coefficients, ϵ T , for 15 aromatic molecules have been measured including carbazole, diphenylamine, fluorene, benzidine, byphenyl, chrysene, coronene and some others. The results obtained have been used for evaluating the solute high triplet level energy escape efficiency β to solvent triplet level (solvent: glassy toluene at 77°K). The absorption of every hundred light quanta in triplet-triplet absorption band of aromatic solute results in 2–18 acts of big portion energy transfer into solvent. The observed differences in β values are tentatively explained in terms of distinct high triplet level lifetimes for various aromatic molecules.
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