1. Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information; Huazhong University of Science and Technology; Wuhan 430074 China
2. Department of Physics and Materials Science; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
3. School of Chemistry and Chemical Engineering; Huazhong University of Science and Technology; Wuhan 430074 China
4. The State Key Laboratory of Refractories and Metallurgy; Wuhan University of Science and Technology; Wuhan 430081 China