Effect of WO3 on the spectroscopic properties in Er3+/Yb3+ co-doped bismuth–borate glasses

The spectroscopic properties of Er3+/Yb3+ co-doped Bi2O3–B2O3–WO3 (BBW) glasses were analyzed and discussed. The effect of WO3 content on the absorption spectra, the Judd–Ofelt parameters Ωt (t=2, 4, 6), emission spectra and the lifetime of the 4I13/2 level and the quantum efficiency of Er3+:4I13/2→4I15/2 transition were also investigated. With the substitution of WO3 for B2O3, the measured lifetime of the 4I13/2 level and the quantum efficiency of Er3+:4I13/2→4I15/2 transition increase from 0.98 to 1.31 ms and from 38.2% to 49.2%, respectively. The effective width of emission band and the emission cross-section both decrease slightly. And the emission spectra is analyzed via the different curve (σe−σa) of BBW glasses, the influence of OH− is also discussed.