1. State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
2. School of Electrical and Control, Nanjing Polytechnic Institute, 188 Xinle Road, Nanjing 211500, China
3. Laboratory of Constitution and Reaction of Matter, University of Felix Houphouet-Boigny, 22 BP 582 Abidjan 22, Cote d’Ivoire