Hua-Wei Zhou1, Sheng-Ze Zhao1, Chun-Yan Qin1, Hao-Zhe Zhang1, Yong-Hua Li1, Shi Wang1
1State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China