1. Centre for AIE Research Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional Materials College of Material Science and Engineering Shenzhen University Shenzhen 518061 P. R. China
2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518061 P. R. China
3. Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction Institute of Molecular Functional Materials The Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong 999077 China