1. College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
2. School of Chemistry and Chemical Engineering Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 P. R. China
3. Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Natural Materials and Micro‐nano Devices Renmin University of China Beijing 100872 P. R. China
4. College of Optical and Electronic Technology China Jiliang University Hangzhou 310018 P. R. China
5. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 P. R. China
6. College of Chemistry and Molecular Engineering Center for Nanochemistry Beijing National Laboratory for Molecular Sciences Peking University Beijing 100871 P. R. China