1. 1 Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
2. College of Science, North China University of Technology, Beijing, 100144, China
3. School of Electronic and Information Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan, 528400, China
4. Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China