Upconversion Emission Properties of Erbium- and Ytterbium-Doped Potassium Lithium Tantalate Niobate Ceramics
LI Lei1**, ZHOU Zhong-Xiang2, YANG Wen-Long2, LI Huan2, WU Ye2
1Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University, Changzhou 213022 2Department of Physics, Harbin Institute of Technology, Harbin 150001
We investigate the luminescence properties of erbium-doped and erbium-ytterbium-codoped potassium lithium tantalate niobate ceramics prepared by the solid phasesyntheses method. The crystalline structure and surface morphology of these ceramics are tested by x-ray diffraction and scanning electron microscopy. The green, red, and near-infrared upconversion photoluminescence properties are analyzed by the steady-state spectra under 975 nm and 800 nm excitations. These ceramics arewell sintered and tetragonal tungsten type crystalline structure with the 4 mm point group and the P4bm space group. The Er3+ upconversion emission integrated intensities increase with theincrease in Er3+ ion concentration, while the green emissiondecreases with the increase in Yb3+ ion concentration under the 800 nm excitation. An effective energy back transfer process from the Er3+4S3/2 state to Yb3+ ground state plays an important role in enhancing the red emission and weakening the green emission.
2013, Vol. 30 
