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 Chemistry Jilin University Qianjin Street 2699 Changchun 130012 P. R. China
3. Institute of Materials for Electronics and Energy Technology (i‐MEET) Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Erlangen 91058 Germany
4. Helmholtz Institute Erlangen‐Nürnberg for Renewable Energy (HI ERN) Immerwahrstrasse 2 Erlangen 91058 Germany
5. School of Information and Optoelectronic Science and Engineering South China Normal University Guangzhou 510006 P. R. China
6. National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou 450002 P. R. China