Intersubband electroluminescence has been investigated in a quantum cascade structure based on vertical transition designed for far-infrared (λ=88 μm) emission. A narrow luminescence peak with a full width at half maximum of 0.7 meV is measured at low excitation currents (30 A/cm2) and low temperature (T=5 K). The electroluminescence efficiency exhibits a strong temperature and current dependence, consistent with an interplay between electron–electron and optical phonon scattering.
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Rochat et al. (1998) studied this question.
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