Room temperature electroluminescence in the midinfrared near 4μm is reported from GaInAsSbP light emitting diodes grown on GaSb by liquid phase epitaxy. Comparison of the electro- and photoluminescence revealed that light is generated on the p side of the diode. The energy shift (24meV) is consistent with band gap narrowing and recombination via band tail states due to the Zn doping (1×1018cm−3) in the p layer of the structure. The temperature dependent behavior of the luminescence and the improved emission intensity was attributed to recombination from localized states arising from electrostatic potential fluctuations due to compositional inhomogeneities in these alloys.
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Krier et al. (2007) studied this question.
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