Optical and upconversion properties of bismuth tellurite glasses Co-doped with Er3+-Yb3+ ions

Abstract Heavy glass system (HGS) with batch compositionsTeO2-Bi2O3-Na2O co-doped with rare earth ions Er2O3&Yb2O3 are synthesized by melt- quench and press method. The batch composition is taken (80-x-y)%TeO2-10%Bi2O3-10%Na2O-x%Er2O3-y%Yb2O3 where (x, y) are (0.1, 0) and (0.5, 0.5). Thermal study of the synthesized sample is done by Differential Scanning Calorimetry (DSC). Amorphous nature of samples is characterized by X-Ray diffractogram. Heaviness of the samples justifies by the calculated densities of the glass samples. For the study of optical properties, Refractive index (R.I.), Optical energy gap (Eg), Urbach’s energy (Eu) absorption spectroscopy in ultra violet –visible-Infrared (UV–VIS-IR) region is carried. For upconversion (UC) characteristics photoluminescence spectroscopy studied.