1. Anhui Key Laboratory of Low Temperature Co-fired Materials, Department of Physics; Huainan Normal University; Huainan, Anhui 232038 P. R. China
2. Jiangsu Key Laboratory of Advanced Functional Materials; School of Chemistry and Materials Engineering, Changshu Institute of Technology; Changshu, Jiangsu 215500 P. R. China
3. Key Laboratory of Optoelectronic Materials Chemistry and Physics; Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences; Fuzhou, Fujian 350002 P. R. China