1. State Key Laboratory of Superhard Materials
2. College of Physics
3. Jilin University
4. Changchun 130012
5. China
6. College of Physics and Electronic Information
7. Luoyang Normal University
8. Luoyang 471022
9. Centre for Advanced Optoelectronic Functional Materials Research and Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education
10. Northeast Normal University
11. Changchun 130024
12. Department of Chemistry and Chemical Engineering
13. Chalmers University of Technology
14. Gothenburg
15. Sweden