1. State Key Laboratory of Optoelectronic Materials and Technologies
2. Nanotechnology Research Center
3. School of Materials Science & Engineering
4. School of Physics
5. Sun Yat-sen University
6. Department of Biomedical Engineering
7. Guangzhou Medical University
8. Guangzhou 510182
9. P. R. China
10. Department of Histology and Embryology
11. Zhongshan School of Medicine
12. Guangzhou 510080