ON THE LASER ACTION OF (ZN,CD)SE MULTIPLE-QUANTUM-WELL STRUCTURES - BI-EXCITONS AT ELEVATED-TEMPERATURES

This paper investigates, both experimentally and theoretically, the co ntribution 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 externa l 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 experiment al findings. (C) 1998 Elsevier Science B.V. All rights reserved.