1. School of Mechatronic Engineering and Automation Shanghai University Shanghai 200444 China
2. School of Materials Science and Engineering Shanghai University Shanghai 200444 China
3. Materials Gerome Institute Shanghai University Shanghai 200444 China
4. Université de Lille CNRS Centrale Lille Université Polytechnique Hauts‐de‐France ISEN‐Yncrea Hauts‐de‐France, UMR 8520 – IEMN Lille 59000 France
5. Light, nanomaterials, nanotechnologies (L2n) CNRS ERL 7004 University of Technology of Troyes Troyes Cedex F‐10004 France
6. Department of Physics Research Centre of Excellence for Organic Electronics and Institute of Advanced Materials Hong Kong Baptist University Kowloon Tong Hong Kong 999077 China