Luminescence and Judd-Ofelt analysis of the Pr³⁺ doped fluorotellurite glass

Praseodymium doped TeO₂-BaF₂-NaF glasses were prepared by conventional quenching melt technique. Optical absorption spectra have been investigated using Judd-Ofelt (JO) theory. Radiative transition probabilities and branching ratios were calculated. The branching ratios for the ¹D₂→³F₄ and ³P₀→³F₂ emission transitions are above 40%. The fluorescence of Pr³⁺ in the visible bands was observed under 325 nm pumping. The energy transfer and concentration quenching have been discussed. The ¹D₂ emission quenches much faster than those of ³P₀ due to the cross-relaxation between ¹D₂→¹G₄ and ³H₄→³F₄ transitions, which provides an appropriate interpretation for the red shift of emission band around 600 nm. The decay curves of ³P₀ level are measured. In 0.5 mol% Pr³⁺ doped sample, we obtained maximum lifetime is 21.5 μs. The prepared glasses are potential candidates for laser applications.