1. Institute of Molecular Functional Materials, Department of Chemistry; Partner State Key Laboratory of Environmental and Biological Analysis and Institute of Advanced Materials; Hong Kong Baptist University; Waterloo Road, Kowloon Tong Hong Kong P. R. China
2. Department of Physics; The Chinese University of Hong Kong, Shatin; Hong Kong P. R. China
3. State Key Laboratory of Molecular Reaction; Dynamics Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116012 P. R. China
4. HKBU Institute of Research and Continuing Education, Shenzhen; Virtual University Park Shenzhen 518057 P. R. China
5. Department of Materials Science and Engineering; University of Science and Technology of China; 96 Jinzhai Road, Hefei Anhui 230026 P. R. China