1. State Key Laboratory for Organic Electronics and Information Displays, Institute of Advanced Materials (IAM), School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
2. School of Physics, and the Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing, China
3. State Key Laboratory of Crystal Materials, Institute of Novel Semiconductors, Shandong University, Jinan, Shandong, China