1. College of Physics
2. Guizhou Province Key Laboratory for Photoelectrics Technology and Application
3. Guizhou University
4. Guiyang City 550025
5. People's Republic of China
6. Key Laboratory of Electronic Composites of Guizhou Province
7. National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology
8. Nanjing University
9. Nanjing 210093