1. Key Laboratory for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High‐efficiency Display and Lighting Technology Henan University Kaifeng 475004 P. R. China
2. Key Laboratory of Bio‐inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
3. College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
4. Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information Displays College of Materials Science and Engineering Huaqiao University Xiamen 361021 P. R. China
5. Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore
6. University of Chinese Academy of Sciences (UCAS) Beijing 100049 P. R. China