1. State Key Laboratory of Luminescence and Applications
2. Changchun Institute of Optics
3. Fine Mechanics and Physics
4. Chinese Academy of Sciences
5. Changchun 130033
6. Department of Materials Science and Engineering
7. Nagoya Institute of Technology
8. Nagoya 466-8555
9. Japan
10. Department of Physics
11. Changchun Normal University
12. Changchun 130032
13. China