1. State Key Laboratory of Luminescence and Applications
2. Changchun Institute of Optics, Fine Mechanics and Physics
3. Chinese Academy of Sciences
4. Changchun 130033
5. China
6. Institute of Physics
7. University of Tsukuba
8. Tsukuba 305-8571
9. Japan
10. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education
11. Jilin Normal University
12. Siping 136000