1. Wuhan National Laboratory for Optoelectronics
2. Huazhong University of Science and Technology
3. Wuhan 430074
4. China
5. State Key Laboratory of Coal Combustion
6. School of Energy and Power Engineering
7. P. R. China
8. Shanghai Synchrotron Radiation Facility
9. Shanghai Institute of Applied Physics
10. Chinese Academy of Sciences
11. Shanghai 201204