Fig. 1. Morphological and spectroscopic characterization of CDs

Fig. 2. Luminescence characteristics of CDs in different solvents

Fig. 3. Effect of water content on fluorescence intensity，emission peak position and fluorescence lifetime of CDs in ethanol-water mixed solution

Fig. 4. Effect of water content on fluorescence intensity，emission peak position and fluorescence lifetime of CDs in DMF-water mixed solution

Fig. 5. Effect of water content on fluorescence intensity，emission peak position and fluorescence lifetime of CDs in methanol-water and EG-water mixed solution