1. Institute of Polymer Optoelectronic Materials and Devices
2. State Key Laboratory of Luminescent Materials and Devices
3. South China University of Technology
4. Guangzhou 510640
5. P. R. China
6. School of Physics and Telecommunication Engineering
7. South China Normal University
8. Guangzhou 510006
9. China
10. National University of Singapore (Suzhou) Research Institute
11. Suzhou 215123
12. Department of Chemistry
13. National University of Singapore