1. Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 China
2. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong 999077 China
3. Department of PhysicsChinese University of Hong Kong New Territories Hong Kong 999077 P. R. China
4. Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic ElectronicsSouthern University of Science and Technology (SUSTech) No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China
5. State and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsLaboratory of Advanced Optoelectronic MaterialsSoochow University Suzhou 215123 China
6. Department of ChemistryWuhan University Wuhan 430072 China