Elsevier

Chemical Physics

Volume 66, Issue 3, 15 April 1982, Pages 351-355
Chemical Physics

Influence of solvent viscosity on excited state lifetime and fluorescence quantum yield of dye molecules

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Abstract

A kinetic model of fluorescent molecules, taking into account the action of internal rotation in a viscous medium as well as of S1-S0 conversion, has been treated by solving a Fokker-Planck equation. Under typical conditions the fluorescence intensity is observed to exhibit a simple exponential decay after excitation. The corresponding decay time, being influenced by the rates of internal rotation and internal conversion, is found to be proportional to ηα over a rather broad range of solvent viscosity η, where α is a parameter depending on the fluorescent molecule. Results are compared with those of the Förster-Hoffmann theory and with experiments concerning dye solutions.

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