STRUCTURAL AND OPTICAL MODIFICATIONS IN BOROTELLURITE GLASS BY DYSPROSIUM DOPING

This study investigates the luminescence and physical properties of dysprosium doped borotellurite glass with the composition: (40-x)TeO2 -35B2O3 - 5CaO - 15ZnO - 5Nb2O5 - xDy2O3 (while x is 0, 0.1, 0.5, 1.0, 1.5 mol%). The glass samples were synthesized using a conventional melt-quenching technique. Characterization techniques, including X-ray diffraction (XRD), optical absorption, and photoluminescence spectroscopy, were employed to analyze the properties of the prepared glasses. XRD confirmed the amorphous nature of the samples. FTIR measurements revealed structural insights into the borotellurite network with the existence of TeO4, BO4, and BO3. Optical absorption spectra displayed characteristic absorption bands associated with Dy3+ ions. Under excitation with the light at 388 nm, the glasses exhibited intense yellow (576 nm) and blue (482 nm) emissions corresponding to the transitions: 4F9/2 → 6H13/2 and 4F9/2 → 6H15/2, respectively. The physical properties, such as density and refractive index were also determined. The results demonstrate the potential of Dy-doped borotellurite glasses as promising materials for optical applications, especially within the development of white light-emitting diodes.