1. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link 637371 Singapore Singapore
2. Jiangsu-Singapore Joint Research Center for Organic/Bio-Electronics & Information Displays and Institute of Advanced Materials (IAM); Nanjing Tech University; 30 South Puzhu Road Nanjing P. R. China
3. Key Laboratory for Organic Electronics & Information Displays; Nanjing University of Posts and Telecommunications; 210023 Nanjing P. R. China
4. Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 117576 Singapore Singapore
5. School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue 639798 Singapore Singapore