1. School of Physics and Optoelectronic Engineering
2. Guangdong University of Technology
3. Guangzhou 510006
4. China
5. Department of Chemistry
6. University of Houston
7. Houston
8. USA
9. National Engineering Research Center for Rare Earth Materials
10. General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co., Ltd.
11. Beijing 100088
12. School of Physics and Electronic Engineering
13. Anqing Normal University
14. Anqing 246133