Ultrafast luminescence kinetics and localization effects of nonequilibrium carriers in degenerate $n$-InGaN layers

The effects of localization of nonequilibrium holes in degenerate epitaxial $n$-InGaN films with a high ($\sim$60%) indium content, which emit in the near-infrared region, are investigated. Using the photoluminescence spectroscopy data with the picosecond time resolution, the energy scales of the tails of the bands, the localization energy, and the width of the distribution of nonequilibrium holes in the random potential relief have been determined. Within the model of recombination of free electrons and localized holes, the character of the temperature quenching of emission and the red shift of the generation wavelength relative to spontaneous emission have been explained.