Optical absorption and fluorescence studies of Dy3+-doped lead telluroborate glasses

Lead telluroborate (PTBDy) glasses doped with different Dy³⁺ ion concentrations were prepared by melt quenching technique and investigated through optical absorption, fluorescence and decay measurements. The Judd–Ofelt intensity parameters (Ω_λ) are obtained by a least square fit analysis. The small root mean square deviation of ±0.34×10^?6 shows a good fit between the experimental and calculated oscillator strengths. The radiative properties of the ⁴F_9/2→⁶H_13/2 emission transition of PTBDy10 glass are determined and compared to the other reported glasses. The variation of decay time of the ⁴F_9/2 emission state is attributed to the interaction among the excited Dy³⁺ ions at higher concentration. The PTBDy10 glass is found to be a suitable candidate for solid state laser materials to produce intense yellow (576 nm) luminescence through the ⁴F_9/2→⁶H_13/2 transition.