Fig. 1 Emission spectra of Bismuth doped silica glass and Tm3+, Er3+ doped glasses[15]

Fig. 2 Photoluminescence (PL) spectral evolution of CdS NPs incorporated mesoporous SiO2 film with respect to ageing time as indicated in the figure in ambient condition[26]

Fig. 3 (a) CIE color coordination of the LEDs with silicate glass embedded CdSe QDs for varying duration times. The actual photographs of the LEDs were displayed on the right side. The insets (b) and (c) show EL + PL spectra of the LEDs[27]

Fig. 4 Comparison of transmitted luminescence of Ce3+ activated garnet luminescent powder phosphor and ceramics[33]

Fig. 5 SEM image, photograph and luminescence spectra of as-prepared by solid state sintering[58-59]

Fig. 6 HRTEM image of the SPS as-consolidated transparent sample[39]

Fig. 7 Photographs of samples sintered at different temperatures[65]

Fig. 8 TEM images of original SBA-15 (a), sintered sample treated by SPS at 1173 K (b) and the silica glass sintered by SPS at 1293 K (c). Schematic of collapse of mesoporous structure and transformation to glass under combination of temperature and pressure(d)[40]

Fig. 9 Schematic illustration of preparation for silica glass incorporated with Au NPs[68]

Fig. 10 (a) TEM image of Ag NPs/SBA-15 and (b) HRTEM image of single Ag nanoparticle from (a); (c) TEM image of the sintered sample and (d) EDX spectrum taken on the dark spherical spots in (c)[69]