Influence of relaxation processes upon the polarization of the fluorescence of organic molecules adsorbed in porous glass

The goal of this research was to use polarized fluorescence to investigate the interactions of adsorbed molecules with the surface of a dielectric. The authors used porous glass into which organic dye molecules, including derivatives of phthalimide and rhodamine, had been introduced. Graphs illustrate the spectral and temperature and time dependences of the degrees of polarization of the fluorescence of the dyes in the matrix material and a rigorous description of these dependences is performed with the Fokker-Planck equation. It is found that the polarization factor for adsorbed molecules is much higher than for molecules in solution.