Article

Nonradiative energy transfer in a concentrated solution of prodan

Optics and Spectroscopy (impact factor: 0.61). 09/2006; 101(4):563-567. DOI:10.1134/S0030400X06100109 pp.563-567

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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Keywords

concentrated solutions
 
electronic spectra exhibit
 
emission band
 
energy transfer
 
higher rate
 
instantaneous spectra
 
luminescence decay
 
luminescence lifetime
 
prodan
 
prodan concentration
 
relaxation processes
 
solution viscosity
 
steady-state conditions
 
temporal characteristics