1. Department of Chemistry; Hubei Key Lab on Organic and Polymeric Optoelectronic Materials; Wuhan University; Wuhan 430072 P. R. China
2. Shenzhen Key Laboratory of Polymer Science and Technology; College of Materials Science and Engineering; Shenzhen University; Shenzhen 518060 P. R. China
3. Key Laboratory of Luminescence and Optical Information; Ministry of Education; Beijing Jiaotong University; Beijing 100044 P. R. China
4. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction; Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong
5. Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA); Shanghai Jiaotong University; Shanghai 200240 P. R. China