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Published online by Cambridge University Press: 10 February 2011
Arsenic-rich InAs/InAs1−x Sbx strained-layer superlattices (SLS's) are studied in time-resolved optical, and CW magneto-optical spectroscopies. A pronounced type-II offset, with electrons confined to the alloy layers, is found. High radiative efficiencies at wavelengths well into the mid-IR, and the suppression of Auger recombination yield LED's operating at 3–10 μm. Present room temperature powers are ∼30 μW, probably limited by inadequate carrier confinement.