ENERGY-TRANSFER PROCESSES IN ORGANIZED MEDIA .1. A CRYSTAL MODEL FOR CUBIC SITES

A general study of energy transfer processes in organized condensed ma tter is presented. Considering the nature of these media, i.e., the pe riodic properties of the lattice, a theoretical microscopic model is w orked out for the general case. It takes full advantage of the transla tional periodicities in the crystalline phase, using the real discrete distribution of ions in the lattice. A general master equation is obt ained and, for the sake of completeness, a particular case is analyzed for the dipole-dipole nonradiative mechanism for energy transfer proc esses in the elpasolite: lattices where the Ln(3+) impurities are in c ubic sites. (C) 1996 American Institute of Physics.