1. Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
2. State Key laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, People’s Republic of China
3. Xiamen Institute of Rare Earth Materials, Haixi institutes, Chinese Academy of Sciences, Xiamen 361005, People’s Republic of China