1. Beijing National Laboratory for Molecular
Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
2. Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
3. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
4. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, P. R. China