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Er3+ doped and (Er3+-Yb3+) co-doped LiNbO3 (LN) crystals grown by the Czochralski method are investigated by photoluminescence spectroscopy. Green up-converted luminescence is observed in Er3+ doped LN crystals under 980 nm excitation. This is explained by an energy transfer between two neighboring Er3+ ions. In (Er3+, Yb3+) co-doped LN crystals, the intensity of the green up-converted luminescence...
The optical properties of Ce-doped SiO2 thin films were investigated by photoluminescence spectroscopy. Strong blue luminescence is obtained at room temperature from as-deposited films. The dependence of the luminescence on both Ce content and annealing temperature is then systematically studied. The luminescence is found to shift to higher wavelength as the annealing temperature increases. Moreover,...
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