1. Materials Science and Engineering College, Guilin University of Technology, Guilin541004, China
2. School of Clinical Medicine, Guilin Medical University, Guilin541004, China
3. Baotou Research Institute of Rare Earths, Baotou014030, China
4. Division Biophotonics, Federal Institute for Materials Research and Testing, Richard-Willstätter-Str 11, Berlin12489, Germany
5. Business School of Guilin University of Technology, Guilin541004, China