1. School of Engineering and Technology
2. China University of Geosciences
3. Beijing 100083
4. P. R. China
5. HEEGER Beijing Research & Development Center
6. School of Chemistry
7. Beihang University
8. Beijing 100191
9. Department of Physics
10. Hong Kong Baptist University
11. Kowloon Tong
12. Hong Kong
13. State Key Laboratory of Luminescent Materials and Devices
14. Institute of Polymer Optoelectronic Materials and Devices
15. South China University of Technology
16. Guangzhou 510640
17. CAS Key Laboratory of Nanosystem and Hierachical Fabrication CAS Center for Excellence in Nanoscience
18. National Center for Nanoscience and Technology
19. Beijing 100190