On the mechanism of time-dependent spectral diffusion in binary solid solutions: The 1,4-dibromonaphthalene and 1-bromo-4-chloronaphthalene system

Abstract

The mechanism of the spectral diffusion process has been studied in the presence of both orientational and substitutional disorder with the help of a simple model calculation. The systems of study are different compositions of solid solutions of 1-bromo-4-chloronaphthalene and 1,4-dibromonaphthalene. The isotropic exchange mechanism for different dimensions are considered in detail. The calculation points to a two-dimensional excitation exchange interaction mechanism. Furthermore, the switching of spectral diffusion occurs at a critical effective acceptor concentration.