1. The Key Laboratory of Rare Earth Functional Materials and Applications
2. Zhoukou Normal University
3. Zhoukou 466001
4. P. R. China
5. The College of Chemistry and Molecular Engineering
6. University Research Facility in Materials Characterization and Device Fabrication
7. The Hong Kong Polytechnic University
8. Hong Kong
9. Department of Applied Physics
10. The Hong Kong Polytechnic University Shenzhen Research Institute