TEM image of the sample annealed for 20 h (sample D). (b) Histogram of the size distribution of the metallic NPs. Average diameter: 6 nm.
Absorption spectra of samples A, C, and E. The features are due to transitions in the ions. The shaded area indicates the expected location of the surface plasmon band.
Luminescence spectra. (a) Sample A, (b) sample C, and (c) sample E. Excitation wavelength: 590 nm. The elastic scattered signal centered at 590 nm was removed from the spectra.
Ratio between the integrated intensities corresponding to and transitions for samples heat treated at different times.
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