Abstract

We report the observation of infrared light emission stemming from transitions between subbands in a superlattice. The radiation is generated by injecting electrons perpendicular to the layers into an excited level of the superlattice. Up to three emission lines are observed, originating from the three lowest intersubband transitions. The relative strength of the lines allows us to determine an effective intersubband temperature for the hot electron system. It can be as high as 140 K for states below the optical phonon energy, but much lower above the optical phonon energy.

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