The red, green, and blue upconversion properties of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses were studied under 980 nm LD excitation. The intense red （657 nm）, green （530 and 545 nm）, and blue （476 nm） emissions were simultaneously observed at room temperature. The results showed that the mixed halide modified tellurite glass （TZFCB） had strong upconversion emissions. The effect of halide on upconversion intensity was observed and discussed, and possible upconversion mechanisms were evaluated. The intense red, green, and blue upconversion luminescence of Er^3＋/Tm^3＋/Yb^3＋-codoped oxyhalide tellurite glasses might be a potentially useful material for developing three-dimensional displays applications.
The glass transition temperature （T）, crystallization onset temperature （T） and Raman scattering spectra of new tellurite glasses were studied as the function of glass composition. With the introduction of other metal oxides such as Nb2O5, BaO and WO3, T temperature increases, the intensity of exothermal peaks decreases, and thermal stability of tellurite glass improves. It was found that more TeO3 units transformed into TeO4 units and non-bridging oxygen atoms decreased with the incorporating other metal oxides in glassy network, when the content of TeO2 was fixed. Appearance of peak at 920 cm^-1 broadens the Raman bandwidth of tellurite glasses, which is very useful realize high efficient broadband fiber Raman amplifiers.
