1. The State Key Laboratory of Refractories and Metallurgy
2. Wuhan University of Science and Technology
3. Wuhan 430081
4. China
5. Department of Physics and Materials Science
6. City University of Hong Kong
7. Wuhan National Laboratory for Optoelectronics (WNLO)
8. School of Optical and Electronic Information
9. Huazhong University of Science and Technology
10. Wuhan 430074