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Room-temperature PL spectra of GaN nanopowders with and without Au deposition. Inset shows the absorbance spectra of Au/GaN nanopowders measured at 300 K.
PL spectra of (a) GaN nanopowders without Au deposition and (b) Au (2 nm)/GaN nanopowders measured at temperatures between 20 and 300 K. Insets show the Arrhenius plot of the integrated PL intensity.
(a) PL spectrum of Au (2 nm)/GaN nanopowders at 20 K plotted on a logarithmic scale. Inset shows the FT spectrum of the PL spectrum. (b) Raman spectrum of GaN nanopowders at room temperature.
Temperature dependence of the bound-exciton peak energy in Au (2 nm)/GaN nanopowders and that of the TO-phonon replicas. The solid and dashed lines represent the results calculated using Eqs. (2) and (3), respectively.
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