Observation of optically pumped midinfrared intersubband luminescence in a coupled quantum wells structure

Y. Lavon, A. Sa'Ar, Z. Moussa, F. H. Julien, R. Planel

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Abstract

We have observed midinfrared emission due to intersubband transitions in a coupled quantum wells structure. The excitation process involves optical pumping of the carriers from the ground subband into the third subband and a generation of a population in the third subband. The luminescence is produced by a radiative transition of the photoexcited carriers from the third to the second subband, followed by a fast relaxation into the ground subband due to a resonance LO-phonon assisted relaxation process. The emission signal persists from low temperatures up to room temperature with a maximum efficiency at 190 K.

Original languageAmerican English
Pages (from-to)1984
Number of pages1
JournalApplied Physics Letters
Volume67
DOIs
StatePublished - 1995

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