Spectroscopic Properties of Pr3+ Ions Embedded in Different Multi Component Phosphate Glasses

摘要

Pr 3+ doped multi component phosphate glasses were prepared by conventional melt quenching technique. The structures were characterized by XRD, Fourier transform infrared and solid-state 31 P NMR techniques. Optical absorption and emission spectra of Pr 3+ doped Li, Ba, Mg and Ca phosphate glasses have been studied. Optical properties of rare earth ion were characterized through optical absorption and emission spectra using Judd -Ofelt theory. Judd -Ofelt intensity parameters . λ (λ=2, 4 ,6) are calculated from t he absorption spectra, which inturn used to derive the radiative properties such as radiative transition probabilities(A R ), radiative lifetimes(τ R ) and branching ratios(β). An attempt has been made to discuss structural changes considering the hypersensitive transitions and covalency of rare earth oxygen (RE-O) bonds for the present glass systems. From the emission spectra, peak emission cross- sections (σ p ) are obtained for the observed emission bands of Pr 3+ ion in all these phosphate glasses. Variation of emission cross-sections with the glass matrix has been studied. Further, decay time constants are estimated from the decay profiles of Pr 3+ - doped different multi component glasses.