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TEM micrographs of the samples annealed for (a) and (b) . The corresponding NP size distributions are shown in (c) and (d).
Absorption spectra of doped samples without NPs and containing NPs for different annealing times, as indicated in the legend.
(a) Simplified energy level scheme of and the transitions studied. (b) UPC emission spectra (sample annealed for ). The features correspond to the transitions: (band I), (band II), and (band III). The inset shows the intensity at as a function of the laser power. The slopes of the straight lines are 2.0 for the sample without silver NP and 2.3 for the sample with NPs.
Normalized integrated intensity ratios , , and as a function of annealing time. The curves are guides to the eyes.
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