Abstract
The negligible interface roughness in our GaAs/AlGaAs multiple quantum well structure (MQW) makes it possible to observe the luminescence of free heavy hole excitons. We get detailed information about relaxation and recombination processes of excitons in a MQW by the observation of the luminescence decay of free and donor-bound excitons with picosecond time resolution. Distinct deviations from an exponential decay can be attributed to the saturation of deep impurity levels, a slow cooling rate of the excitons and a delayed thermalization between various free and donor-bound exciton states.
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