PHYSICAL, ABSORPTION AND FLUORESCENCE SPECTRAL STUDIES OF Pr 3+ IONS DOPED LITHIUM BISMUTH BORATE GLASSES

Glasses of the system: xB 2 O 3 -10Bi 2 O 3 -30Li 2 O-xPr 6 O 11 where x =1, 1.5 and 2 were prepared by melt quenching technique. Optical absorption and emission spectra have been recorded. The intensities of f-f transition are calculated in term of Judd-Ofelt (JO) intensity parameters Ω λ (λ = 2, 4 and 6). Using the fluorescence data and these Ω λ parameters, various radiative properties like transition probability (A rad ), branching ratio (β R ), radiative lifetime (τ R ), and stimulated emission cross section (σ p ), of various emission lines have been evaluated. The branching ratio for 3 P 0 → 3 H 4 transition is 56% and the predicted spontaneous radiative transition probability rates are fairly high 16411 s −1 . This is beneficial for lasing emission.