A detailed analysis of the mechanisms of radiative and
Auger recombination in type I and II heterostructures based on
narrow-gap AIIIBV materials is presented. It is shown that the
presence of a heterointerface fundamentally changes the nature of
these recombination processes differently, depending on the type
of heterojunction. Results of our study of the electroluminescence
of type I and II LED heterostructures based on InAs(Sb)/InAsSbP
quantum wells are presented. It is shown that the increase in
relative efficiency of radiative recombination in type II heterostructures
due to suppression of Auger recombination contributes to
generation of stimulated emission in these heterostructures at low
temperatures (4.2−70K).