Fluorescence Features of Dy³⁺ Doped PbO-Bi₂O₃ Borophosphate Glasses

The heavy metal oxide lead bismuth magnesium borophosphate glass systems (LBMBPD)dysprosium ions doped with the molar compositions of (50-x) PbO -x Bi₂O₃-25MgHPO₄-24B₂O₃-1Dy₂O₃ (where x = 10, 20, 30, and 40 mol %) were prepared using conventional melt quenching technique. The spectral data from the optical absorption photoluminescence were utilized to evaluate various spectroscopic parameters. The Judd-Ofelt parameterization employed reflects the covalency and vibration frequencies of the ligands with dysprosium ions. The radiative parameters such as radiative transition probabilities (A), the total radiative transitional probabilities (AT), radiative life times (τR), branching ratios (β) and absorption cross sections (□) were computed for certain lasing levels. The emission cross sections (σe) for the significant lasing transitions ⁴F_9/2→ ⁶H_13/2 and ⁴F_9/2 → ⁶H_15/2 evaluated from the photoluminescence spectra were reported. The radiative properties thus obtained in our investigations reflect their potentialities as good lasing candidates.