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(a) Schematic illustration of the preparation process for multicolor carbon dots (CDs) using m- and o-phenylenediamines in the absence and presence of tartaric acid (TA), respectively; (b,c) Photographs of the obtained b-CDs, g-CDs, y-CDs, and r-CDs dispersions in ethanol under daylight (b) and 365 nm UV light (c), respectively; (d) Normalized photoluminescent (PL) emission spectra of the multicolor CDs (in ethanol) under excitation of 365 nm.
