Investigation on luminescence properties and XANES of dysprosium ion doped borophosphate glasses

In this research, melt quenching was used to prepare Dy³⁺ ion doped alkaline borophosphate glasses. According to the XANES measurement, Dy ions in glass show +3 oxidation state, identical to the standard Dy₂O₃ powder. Glasses were measured for density (ρ), molar volume (V_m), and refractive index (n). The absorption peaks, which are assigned to transitions from the ground state ⁶H_15/2 to higher energy levels of Dy³⁺ ion in glass matrix. Four prominent emission bands were observed in luminescence spectra, which correspond to the ⁴F_9/2→⁶H_J (J = 15/2, 13/2, 11/2, 9/2) transitions. The Judd-Ofelt (J-O) intensity parameters follow the trend as Ω₂>Ω₆>Ω₄ of the PBLAGdDy_1.0. For the stimulated emission cross-section and branching ratio (>0.5), ⁴F_9/2 → ⁶H_13/2 transition was found to be higher than other transitions. Because the decay curves of glasses with different concentrations of Dy³⁺ ion were found to be non-exponential, these glasses were calculated using the Inokuti-Hirayama (I-H) model. The obtained photoluminescence and decay times spectra primarily showed energy transfer effects from Gd³⁺ to Dy³⁺ ions and the calculated values of energy transfer efficiency (η) found that the values increased, which confirms energy transfer from Gd³⁺ to Dy³⁺ ions. From this study, the current glasses could be useful in the applications of solid-state lasers, LEDs, and scintillation materials.