1. Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials
2. Jiangsu National Synergetic Innovation Center for Advanced Materials
3. Nanjing University of Posts & Telecommunications
4. Nanjing 210023
5. China
6. School of Materials Science and Engineering
7. Nanyang Technological University
8. Singapore 639798
9. Singapore
10. Division of Chemistry and Biological Chemistry