1. Center of Materials Science and Optoelectronics Engineering
2. College of Materials Science and Opto-Electronic Technology
3. University of Chinese Academy of Sciences
4. Beijing 100049
5. P. R. China
6. Beijing National Laboratory for Molecular Sciences
7. State Key Laboratory of Rare Earth Materials Chemistry and Applications
8. College of Chemistry and Molecular Engineering
9. Peking University
10. Beijing 100871