On the laser action of (Zn, Cd)Se multiple-quantum-well structures: Bi-excitons at elevated temperatures

Abstract

This paper investigates, both experimentally and theoretically, the contribution of localized bi-excitons to the laser action of ternary II–VI quantum wells. We have performed steady-state photoluminescence and stimulated emission measurements, also in combination with an external magnetic field, showing that localized bi-excitons play an essential role up to temperatures clearly above 100 K. Considering a system of rate equations taking into account localized excitons and bi-excitons, threshold calculations yield reasonable agreement with the experimental findings.