Abstract
The influence of high-density optical excitation on n-doped ZnSe/(Zn,Mg)(S,Se) quantum wells is studied by quasi-stationary photoluminescence and pump-probe experiments. In photoluminescence, the trion and exciton transitions saturate weakly with increasing excitation density. This is accompanied by superlinearly growing low- and high-energy wings attributed to collisions in the dense system of excitons, trions and carriers. For non-resonant excitation, a strong heating of the background carrier gas takes place and collisions lead to an effective recombination already during the relaxation of the electron-hole pairs down to the bottom of the band. This process limits reachable exciton and trion densities under quasi-stationary excitation.
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