THERMALLY STABLE DYSPROSIUM DOPED ZINC-SODIUM-TELLURITE GLASSES: ABSORPTION AND EMISSION PROPERTIES ENHANCEMENT

Abstract

Tellurium dioxide among the numerous glass formers have been of interest to researchers due to its promising characteristics. Consequently, absorption and emission are among the most paramount features of glasses applicable in lasers and other optical devices, but there are not much report on absorption and emission properties of Zinc-Sodium-Tellurite Dysprosium doped glasses. Series of dysprosium (Dy³⁺) ions doped zinc-sodium-tellurite glass having composition (65-x)TeO₂-25ZnO-10Na₂O-xDy₂O₃ (0 ≤ x ≤ 2.5 mol%) were prepared using melt-quenching method. Transparent and thermally stable glass samples were characterized via UV-Vis-NIR absorption, photoluminescence (PL), and Fourier transform infrared (FTIR) spectroscopy. Density and molar volume of prepared glass system were found to be in the range of 5.334-5.366 gm^-3 and 24.425-25.273 cm³mol^-1, respectively. FTIR spectra exhibited various bonding vibrations corresponding to glass network structures and units. UV-Vis-NIR spectra revealed seven absorption peaks centred at 450, 752, 801, 901, 1095, 1281, and 1687 nm which were assigned to the transitions from the ground state to the excited levels such as⁶H_15/2 →⁴F_9/2, ⁶H_15/2 →⁶F_3/2, ⁶H_15/2 →⁶F_5/2, ⁶H_15/2 →⁶F_7/2, ⁶H_15/2 →⁶H_7/2, ⁶H_15/2 →⁶F_11/2, and ⁶H_15/2 →⁶H_11/2 of Dysprosium Dy³⁺ ions, respectively. Room temperature PL spectra displayed three significant peaks centred at 497, 588, and 675 nm, which were allocated to the transitions from ⁴F_9/2 excited state to the ⁶H_11/2, ⁶H_13/2, and ⁶H_15/2 states, respectively. Present optimized glass composition may be potential for the development of solid state lasers and photonic devices.