1. State Key Laboratory on Integrated Optoelectronics
2. College of Electronic Science and Engineering
3. Jilin University
4. Changchun 130012
5. China
6. State Key Laboratory of Integrated Optoelectronics
7. Institute of Semiconductors
8. Chinese Academy of Sciences
9. Beijing 100083
10. Department of Chemistry
11. Brown University
12. Providence
13. USA