Effects of Bi2O3 on Up-conversion Luminescence Properties of Tm3+/Yb3+-codoped Ga2O3-GeO2-Bi2O3-PbO Glass

This paper reports on frequency up-conversion (UC) emission properties in Tm3+/Yb3+-codoped Ga2O3-GeO2-Bi2O3-PbO glass upon excitation of 980 nm laser diode. A close correlation is observed between the Bi2O3 substituted content for PbO and UC luminescence properties of Tm3+. It was found that the decreasing PbO and increasing Bi2O3 content improve the blue and red UC emission intensity. The maximum of UC emission intensity is obtained when substituted PbO content is at 35%. In addition, the dependence of the UC emission intensity upon the excitation power has been examined and the involved mechanisms have also been discussed.