Abstract
The neutral donor-bound light-hole free exciton has been observed in AlxGa1−xAs-GaAs multi-quantum wells (MQWs). The transition was observed using selective excitation photoluminescence spectroscopy on two nominally 350-Å-wide AlxGa1−xAs-GaAs MQW structures in the energy region between the light-hole and heavy-hole free-exciton transitions, where no other intrinsic transitions exist. The neutral donor-bound heavy-hole free-exciton transition was also observed in both MQW structures. A third 150-Å-wide MQW structure which showed no evidence of a donor-bound heavy-hole free exciton also showed no evidence of a donor-bound light-hole free exciton.
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