1. Key Laboratory of Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, P. R. China
2. College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China
3. Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
4. Research Center for Rare Earth Materials and Applications, School of Physics and Electronic Information, Gannan Normal University, Ganzhou 341000, P. R. China
5. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States