Submicron-Scale Photoluminescence of InGaN/GaN Probed by Confocal Scanning Laser Microscopy

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Abstract
Confocal scanning laser microscopy was used for the first time to obtain the submicron-scale photoluminescence (PL) of InGaN/GaN single quantum wells (SQWs). We found island-shaped spatial inhomogeneities of both PL intensities and spectra as small as 100-200 nm. The spatial resolution of the obtained PL images was much smaller than the diffusion length of carriers in active layers at room temperature. (DOI: 10.1143/JJAP.43.839)