1. Organic Solid Laboratory, BNLMS, CMS & Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
2. Institute of Condensed Matter and Material Physics, Department of Physics, Peking University, Beijing, 100871, P. R. China
3. State Key Laboratory of Rare Earth Materials Chemistry and Applications, BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
4. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
5. CAS Research/Education Center for Excellence in Molecular Science, CMS & BNLMS, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
6. BSRF, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100047, P. R. China
7. Department of Materials Science and Engineering, Tokyo Institute of Technology, O-Okayama, Tokyo 152-8552, Japan