1. Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering and Division of Life Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China
2. Department of Physics, HKUST, Clear Water Bay, Kowloon, Hong Kong, China
3. HKUST-Shenzhen Research Institute, No. 9 Yuexing First Road, South Area, Hi-Tech Park, Nanshan, Shenzhen 518057, China
4. NSFC Center for Luminescence from Molecular Aggregates, SCUT-HKUST Joint Research Institute, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China