1. School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, People's Republic of China
2. State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, People's Republic of China
3. Institute of Electronic and Information Engineering of UESTC in Guangdong, Zongbu Second Road No. 17, Dongguan, Guangdong 523808, People's Republic of China