Synthesis and Luminescent Properties of Er3+ Doped TeO2-B2O3-ZnO-Na2O Glasses

Abstract

In this study, Er³⁺-doped boro-tellurite glass with the composition TeO₂–B₂O₃–ZnO–Na₂O (BTZN) and varying dopant concentrations was fabricated by the high-temperature melt-quenching method. X-ray diffraction (XRD) analysis showed that the prepared samples exhibit an amorphous structure characteristic of glass. Scanning electron microscopy (SEM) images revealed that the sample surfaces are smooth, flat, and homogeneous. The photoluminescence spectra of the glasses, obtained under 378 nm and 532 nm excitation, exhibit visible emissions at 530 nm and 547 nm, corresponding to the 2H11/2 - 4I15/2 and 4S3/2 - 4I15/2 transitions, respectively, as well as a near-infrared emission at 980 nm attributed to the 4I11/2 - 4I15/2 transition of Er³⁺ ions in the BTZN glass matrix. The luminescence intensity of the samples varies with dopant concentration, and the optimal Er³⁺ concentration was determined to be 2.0 mol%.