1. Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
2. Fluorescence Research Group, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore
3. Department of Chemistry, School of Science, Hainan University, Haikou, 570228, China