A series of Er<sup>3</sup>+/Yb<sup>3+</sup> co-doped Sb<sub>2</sub>O<sub>3</sub>-WO<sub>3</sub>-Li<sub>2</sub>O glasses were prepared. Intense green upconversion fluorescence was observed near 524 and 544nm under excitation at 980 nm. The upconversion process was proved to be a two-photon absorption process. The upconversion fluorescence efficiency was enhanced by increasing introduction concentration of Yb<sup>3+</sup> ions. The low maximum phonon energy of the glasses indicated that the glasses were good potential for upconversion optical devices.
KeywordsUpconversion FluorescenceGlassesLaser
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