Abstract
The temporal characteristics of luminescence decay in concentrated solutions of prodan excited by picosecond laser radiation are studied The electronic spectra exhibit a strong inhomogeneity, which, in the case of elevated solution viscosity, manifests itself under steady-state conditions of measurements. The temporal characteristics of the luminescence decay and the time-resolved luminescence spectra point to the occurrence of relaxation processes causing a long-wavelength shift of the emission band with time. An increase in the prodan concentration from 10−4 to 5 × 10−2 M leads to a faster increase in the luminescence lifetime in the long-wavelength spectral region and to a higher rate of shifting of the instantaneous spectra, which is related to energy transfer over the states of inhomogeneous broadening of the luminophore.
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