1. Institute of Fluorescent Probes for Biological Imaging, School of Materials Science and Engineering, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
3. Department of Chemistry, Korea University, Seoul 02841, Korea
4. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, P. R. China