1. Key Laboratory of Luminescence and Optical Information; Ministry of Education; Department of Physics; School of Science; Beijing Jiaotong University; Beijing 100044 P. R. China
2. Department of Chemistry; Stanford University; Stanford CA 94305 USA
3. School of Physical Science and Technology; Lanzhou University; Lanzhou 730000 P. R. China
4. Tianjin Key Laboratory of Molecular Optoelectronic Sciences; Department of Chemistry; Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin 300072 P. R. China
5. World Premier International Center for Materials Nanoarchitectonics (WPI-MANA); National Institute for Materials Science (NIMS); Namiki 1-1 Tsukuba 305-0044 Japan
6. Australian Institute for Innovative Materials (AIIM); University of Wollongong; Squires Way North Wollongong NSW 2500 Australia
7. Beijing National Laboratory for Molecular Sciences (BNLMS); Institute of Chemistry Chinese Academy of Sciences; Beijing 100190 China