Study on Upconversion and Thermal Properties of Tm/Yb Co-Doped La₂O₃-Nb₂O₅-Ta₂O₅ Glasses.

The effect of Yb ions on upconversion luminescence and thermal properties of Tm/Yb co-doped La₂O₃-Nb₂O₅-Ta₂O₅ glasses has been studied. Glass transition temperature is around 740 °C, indicating high thermal stability. The effect of Yb ions on the thermal stability is not obvious.