Modeling recombination processes in solid solutions with large-scale composition fluctuations

A model describing recombination processes in a solid solution containing large- scale compositional fluctuations is developed. Modeling considered carrier injection, their dynamics in a random potential, energy relaxation via phonon scattering, carrier capture by defects, and radiative and non-radiative recombination. The results of modeling show that intensive luminescence from the samples of solid solutions with large-scale compositional fluctuations, which is observed experimentally, is a substantial increase of carrier concentration in fluctuation-induced potential minima of the energy gap.