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.