Intense frequency upconversion fluorescence emission of Er~(3+)/Yb~(3+)-codoped oxychloride germanate glass

摘要

Structural and frequency upconversion fluorescence properties of Er~(3+)/Yb~(3+)-codoped oxychloride germanate glasses have been investigated. The Raman spectrum investigation indicates that PbCl_2 plays an important role in the formation of glass network and has an important influence on the upconversion luminescence. Intense green and red emissions centered at 525, 546 and 657 nm, corresponding to the transitions 2~H_(11/2) - > 4~I_(15/2), ~4S_(3/2) - > ~4I_(15/2) and ~4F_(9/2) - > ~4I_(15/2), respectively, were observed at room temperature. The possible upconversion mechanism was also estimated and evaluated. Intense upconversion luminescence indicates that Er~(3+)/Yb~(3+)-codoped oxychloride germanate glass is a promising laser material.