Midinfrared intraband electroluminescence from AlInAs quantum dots

Ulbrich, N.; Bauer, J.; Scarpa, G.; Boy, R.; Schuh, D.; Abstreiter, G.; Schmult, S.; Wegscheider, W.
August 2003
Applied Physics Letters;8/25/2003, Vol. 83 Issue 8, p1530
Academic Journal
Midinfrared electroluminescence from a cascade of coupled AlInAs quantum dots and GaAs quantum wells at low temperature (80 K) is demonstrated. At low injection currents, the spectra show a clear peak at 158 meV with a luminescence width of 15 meV which is associated with transitions from the s shells of a resonant subensemble of quantum dots. A Stark shift to 143 meV and spectral broadening is observed at higher injection currents which is associated with luminescence from the inhomogeneously broadened quantum-dot ensemble. The reported design is a possible solution to obtain population inversion in unipolar quantum-dot-cascade structures. © 2003 American Institute of Physics.


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