1. Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems; School of Materials Science and Engineering; Beijing Institute of Technology; 5 Zhongguancun South Street, HaiDian District Beijing 100081 P. R. China
2. School of Physics; Beijing Institute of Technology; 5 Zhongguancun South Street, Haidian District Beijing 100081 China
3. State Key Laboratory of Supramolecular Structure and Materials; Jilin University; Qianjin Street Changchun 130013 China