Abstract
The quantum-confined Stark effect (QCSE) has been studied in electroluminescence (EL) spectra by using GaAs/AlQ 3GaQ 7As symmetric coupled double-quantum-well (CDQW) structures under a "forward" electric field. The Stark shift for the transition between the ground electron state and heavy-hole state was successfully observed, and was found to be symmetrical with regard to the flat-band bias for EL and photoluminescence (PL), in which the electric field was applied in the forward and reverse directions, respectively. Circularly polarized photoluminescence excitation (CPPLE) spectroscopy was also employed to clarify the origins of optical transitions related to either heavy-hole or light-hole resonance. Each transition between electrons and light- and heavy-holes in the CDQWs was clearly identified by PL and by polarization of CPPLE spectra.
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