FORWARD AND REVERSE EXCITATION-ENERGY TRANSPORT AND CONCENTRATION DEPOLARIZATION IN 2-COMPONENT SYSTEMS

A theoretical study of forward and reverse electronic excitation energ y transport and trapping in a two-component disordered system is prese nted. The method used is an extension of the diagrammatic technique ap plied by Loring, Andersen, and Fayer to the system with no reverse ene rgy transfer. The results of an exact diagrammatic analysis of the con figuration-averaged Green function of the master equation are presente d. The following steady-state observables: relative donor quantum yiel d and emission anisotropy, are obtained using the self-consistent appr oximation. The numerical results for Forster dipole-dipole transfer ar e evaluated within the framework of the improved two-body approximatio n introduced herein (the two-body approximation and the three-body tre atment of the energy migration process in the donor ensemble). A compa rison with the experimental data and Monte Carlo results is presented.