Resonant Light Scattering and Luminescence in Exciton-Phonon System. II. Extended Analysis by a Simplified Balance Equation

Abstract

The relaxation process of a photo-generated exciton is studied under conditions including high temperature and small nonradiative damping, where the LO phonon cascade relaxation (LOCR) lines and a broad luminescence coexist in a wide energy range of the light scattering spectrum. To treat this, a simplified balance equation for the exciton distribution function is derived by extending the theory in the preceding paper, and solved numerically. With some further approximations, analytic investigations are also made. According as how LOCR process and the multiple LA scattering process occur during the life time of exciton, the behavior of the distribution function is classified into three types, and from. this view point, a discussion is given on the comparison with experimental observations.