Abstract
The growth and characterization of quantum well structures based on the GaAs/AlGaAs material system is reported. Electroluminescence spectra from intersubband and interminiband transitions are shown. The quantum cascade structures are designed to emit mid-infrared radiation in the range from 7 to 12 μm. Radiation from intersubband transitions in a coupled quantum well system and interminiband transitions in undoped finite superlattices up to room temperature is reported. In finite superlattices emission from vertical transitions from different miniband states can be seen at low temperatures.
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