1. Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
2. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China
3. School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300350 P. R. China
4. School of Physics State Key Laboratory of Crystal Materials Shandong University Shandong 250100 P. R. China
5. University of Chinese Academy of Sciences Beijing 100049 P. R. China
6. School of Chemistry and Biology Engineering University of Science and Technology Beijing Beijing 100083 P. R. China