1. Shanghai Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; No. 390, Qinghe Road, Jiading District Shanghai 201800 P. R. China
2. Key Lab of Functional Inorganic Material Chemistry (Heilongjiang University); Ministry of Education; Harbin 150080 P. R. China
3. Department of Applied Physics; Harbin Institute of Technology; Harbin 150080 P. R. China