Effect of Bi 2 O 3 on the physical, structural and NIR emission properties of BGG glasses prepared using different melting atmospheres

Abstract

BGG -Bi 2 O 3 glasses with composition 40GeO 2 –20Ga 2 O 3 –40BaO: x Bi 2 O 3 ( x = 0, 1, 2, 4, 6, 8 - 1.0 mol %) were analyzed in terms of optical, thermal properties and structure. The dependence of Bi 2 O 3 content on thermal, structural, and optical properties was investigated by thermal analysis (DSC), Raman spectroscopy, UV–visible and near-infrared absorption, and the M-Line technique to access refractive index values. The results show that with the increase of Bi 2 O 3 , the density, the glass transition temperature (T g ), the refractive index, and the optical band gap energy decrease. Different melting atmospheres were added during the syntheses to measure their impact on the photoluminescence of bismuth around 1300 nm. From XPS analysis, photoluminescence measurements indicate that the Bi 3+ oxidation state is the main one responsible for the broad near-infrared band from 1000 nm to 1600 nm in these glasses.