Peak position, width, and intensity of PL band and normalized emission efficiency (ratio of PL intensity to excitation intensity) as a function of excitation power density at two temperatures: (a) and (b) .
Photoluminescence spectra at excitation power density of and different temperatures: . The spectra are normalized and shifted along the vertical axis for clarity.
Peak position and width of PL band and emission efficiency as a function of temperature at two excitation power densities indicated.
Decay of PL intensity at different wavelengths indicated under high and low excitation energy density. The solid lines are single exponential fits corresponding to carrier lifetime of .
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