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(a) The sintering process for the disk shaped samples; heating times are indicated below the respective samples. (b) A photograph of photoluminescent silica glass, which was prepared by heating fumed silica at for , excited with a pulsed Nd:YAG laser light (; per pulse). A bright part corresponds to the irradiated area with the laser (beam diameter ).
PL spectra of the silica glass samples heat-treated at for different hours excited with a xenon lamp . The inset shows an absorption spectrum of the sample heat-treated at for
A semilog plot of the PL decay signals for transparent silica glass prepared by heating fumed silica at for . The time-resolved PL signal was detected at using a pulsed Nd:YAG laser with a gate width of . The solid line is the best-fit curve using a stretched exponential function.
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