Abstract
Containerless processing has been used to prepare Tm3+/Yb3+ co-doped La2O3-TiO2-ZrO2 (LTZ) glasses with intense blue emission. The effects of Yb3+ ions on the thermal stability and upconversion luminescence of as-prepared LTZ glasses and glass-ceramics have been studied. Yb3+ ions perform negative effect on the thermal stability of glasses. As Yb3+ increases, the emissions can be enhanced by improving energy transfer from Yb3+ to Tm3+ and reducing energy loss. A model is proposed to discuss the effects of active ions, sensitizers, and hosts on the upconversion luminescence process. Moreover, the refractive index value and Abbe number of glasses are 2.261 and 20.7, indicating excellent optical properties.
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