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. Shenzhen Guohua Optoelectronics Tech. Co. Ltd. & Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, P. R. China
3. National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China
4. State Key Lab of Supramolecular Structure and Materials College of Chemistry, Jilin University Changchun 130012, P. R. China
5. Department of Mechanical & Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region
6. Department of Electronic & Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region
7. BE Lab, Faculty EWI, Delft University of Technology, Delft 2628CD, The Netherlands