Generation of midinfrared electroluminescence associated with transitions between conduction-band Wannier-Stark ladder states in strongly coupled semiconductor superlattices is reported. Both intraladder and interladder transitions, in the two regimes of strong electric-field-induced localization and resonance-induced delocalization, are observed. The difference between this incoherent spontaneous emission mechanism and the coherent spontaneous radiation from Bloch oscillations is discussed.
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Scamarcio et al. (1998) studied this question.
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