1. College of Chemistry and Environment ScienceInner Mongolia Normal University Hohhot 010022 China
2. Tianjin Key Lab for Rare Earth Materials and ApplicationsCentre for Rare Earth and Inorganic Functional MaterialsSchool of Materials Science and Engineering & National Institute for Advanced MaterialsNankai University Tianjin 300350 China
3. State Key Laboratory on Integrated OptoelectronicsJilin University Jilin 130012 China