1. State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques; South China University of Technology; Guangzhou 510641 China
2. Debye Institute for Nanomaterials Science; Utrecht University; Princetonplein 1 ,3584-CC Utrecht The Netherlands
3. Analytical and Testing Centre; South China University of Technology; Guangzhou 510641 China
4. Beijing National Laboratory for Molecular Sciences; State Key Laboratory of Rare Earth Materials Chemistry and Applications; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China