Variation of photoluminescence features in Pr~(3+) doped lithium-fluoro-borate glass by changing different modifier oxides (MgO, CaO, CdO and PbO)-Judd-Ofelt theory application

摘要

Pr~(3+) (1.0 mol%) doped different modifier oxide based six lithium-fluoro-borate glasses with chemical composition of 49Li_2B_4O_7-20BaF_2-10NaF-20MO (where M= Mg, Ca, Cd and Pb), 49Li_2B_4O_7-20BaF_2-10NaF-10MgO-10CaO and 49Li_2B_4O_7-20BaF_2-10NaF-10CdO-10PbO were prepared by conventional melt quenching technique. Judd-Ofelt theory has been applied for evaluating the Judd-Ofelt intensity parameters for Pr~(3+) ion in these glass compositions and are in turn to used to predict radiative properties such as radiative transition probabilities (A_T), branching ratios (β) and stimulated emission cross-section (σ_P). Stimulated emission cross-section (σ_P) of prominent emission transitions, ~3P_0→~3H_4 and ~1D_2→~3H_4 of Pr~(3+) ion in all lithium-fluoro-borate glasses were calculated. Among all the emission transitions, ~3P_0→~3H_4 posseses higher branching ratio and stimulated emission cross-section in Mg-Ca glass, which leads to the best laser excitation at 487 nm wavelength.