Depolarization of Luminescence from Dye Molecules in Solutions or Embedded in Zeolite Pores

Abstract

Depolarization of luminescence from pyronine B dye molecules was studied using polarized photoluminescence spectroscopy. When the molecules were dissolved in a solvent, the viscosity and the electronic dipole moment of the solvent affected the depolarization ratio and the photoluminescence peak position, respectively. In addition, the concentration of the dye molecules also influenced the depolarization ratio and the photoluminescence. For pyronine B molecules embedded in zeolite-L crystals, the photoluminescence peak position was independent of the concentration, and the depolarization ratio showed a dependence on the concentration that was opposite to the case of dye molecules in a solvent. The energy transfer between the molecules or the re-absorption process is suggested to explain the experimental results.