Abstract
In this paper, we report a detailed optical investigation of the exciton transfer process in AlGaN epilayers with nanoscale compositional inhomogeneities (NCI). Temperature and time- dependent photoluminescence studies were performed. Modeling of the experimental data shows that the enhanced luminescence is due to a rapid transfer of the excitons from a wider band gap matrix to a narrower bandgap and lower dimensional NCI region with a short radiative lifetime. This effect greatly enhances luminescence efficiency.In this paper, we report a detailed optical investigation of the exciton transfer process in AlGaN epilayers with nanoscale compositional inhomogeneities (NCI). Temperature and time-dependent photoluminescence studies were performed. Modeling of the experimental data shows that the enhanced luminescence is due to a rapid transfer of the excitons from a wider band gap matrix to a narrower bandgap and possibly lower dimensional NCI region with a short radiative lifetime. This effect greatly enhances luminescence efficiency.
Published Version
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