1. State Key
Laboratory of Optoelectronic Materials and Technologies, and Guangdong
Province Key Laboratory of Display Material and Technology, School
of Microelectronics, Sun Yat-Sen University, Guangzhou, 510275, People’s Republic of China
2. Deptartment
of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37212, United States
3. Department of Macromolecular Science, Fudan University, Shanghai, 200433, China