1. Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Rare Earth Materials Chemistry and Applications, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, P. R. China
2. Ninhai Doubly Advanced Material Co, Ltd., Ninhai 315602, China
3. Department
of Chemistry, School of Science, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
4. School
of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, P. R. China
5. Department
of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States