Time-Resolved Reabsorption Effect on the Fluorescence Decay of Anthracene Crystal and Solution

Abstract

The wavelength dependence of the fluorescence decay time for an anthracene crystal, is discussed with reference to a time dependent reabsorption model, and the time dependence of the reabsorption is shown to be related to the distribution of excitons. From the time-resolved analysis of the temperature dependence of the fluorescence decay, the reabsorption effect is shown to increase over the whole decay period. In order to analyze the concentration dependence of the fluorescence decay in a solution, the Stern-Volmer type equation is applied to the experimental data with two new parameters being introduced. Optimum values of the parameters are obtained from the calculated curves which agree fairly well with the experimental data. The reabsorption effect in the solution increases during a certain time period, but afterwards it decreases.