1. State Key Laboratory
of Luminescent Materials and Devices, School of Materials Science
and Engineering, South China University of Technology, Guangzhou 510640, China
2. Guangdong
Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Special Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong Province, Guangzhou 510640, China
3. Key Laboratory of Transparent Opto-functional
Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
4. College
of Optical Science and Engineering, State Key Laboratory of Modern
Optical Instrumentation, Zhejiang University, Hangzhou 310027, China