光子功能材料与器件研究室知识库

A novel of Yb3+-doped TeO2-K2O-ZnO-Al2O3-based tellurite glasses with both good thermal stability and high-emission cross-section was prepared by verifying Al2O3 additions. The changes in the thermal stability parameter Delta T (= T-x - T-g) and glass network configuration were investigated using differential scanning calorimeter (DSC) and Raman spectra measurements. DSC results show that the investigated tellurite glasses have favorite thermal stability for fiber drawing, and the maximum value of Delta T is up to 150 degrees C. Raman spectra analysis indicates that the introduction of Al2O3 changes the polyhedron structural units of Te from TeO4 to TeO3+1, and in a further step to TeO3 configuration. The substitution of ZnO by Al2O3 increases the glass's network connectivity, resulting in improvement of the glass's thermal stability and increase of the emission cross-section of Yb3+ ions in the glasses. (C) 2012 Elsevier B.V. All rights reserved.