1. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China
2. Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, Key Laboratory of High Performance Polymer Material and Technology, MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
3. Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
4. School of Polymer Science and Engineering, Center for Optoelectronic Materials and Devices, University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA
5. Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B3P4, Canada
6. Nanoscience and Technology Division, Argonne National Laboratory, Lemont, Illinois 60439, USA