Upconversion luminescence in Er~(3+)/Yb~(3+) codoped PbO-Bi2O3-Al2O3-B2O3 glasses

摘要

Er~(3+)/Yb~(3+)co-doped glasses with the composition PbO-Bi2O3-Al2O3-B2O3 were prepared by melt quenching method. Optical absorption (OA) and photoluminescence (PL) and FT-IR spectra of all the glasses were recorded at room temperature. Green and red upconversion emissions centered at 525, 545 and 654 nm corresponding to ~2H_(11/2) -> ~4I_(15/2), ~4S_(3/2) -> ~4I_(15/2) and ~4F_(9/2) -> ~4I_(15/2) transitions of Er~(3+) ions have been obtained under the excitation of 980 nm laser at room temperature. From emission spectra it was observed that the intensity of red emission increases with increasing the concentration of Er~(3+) ions upto 0.8 mol% and decreases with the further increase in the concentration of Er~(3+) ions. The spectra have been analyzed in the light of structural modifications in the vicinity of the dopant rare earth ions, due to relative variations in the concentration of Al2O3 and B2O3 in the glass network.