Nitrogen-doped yellow carbon quantum dot and preparation method thereof

The invention discloses a nitrogen-doped yellow carbon quantum dot and a preparation method thereof. The particle size of a yellow carbon quantum dot fluorescent material is in a range of 3-6 nm. Theyellow carbon quantum dot can emit bright yellow fluorescence under the excitation of light with a wavelength of 320 nm-550 nm, and fluorescence quantum efficiency can reach 38% at most. According tothe preparation method, 2,4,6-trihydroxybenzoic acid is used as a carbon source, m-phenylenediamine is used as a nitrogen source, and tin salt is used as a catalyst, so the synthesis time for synthesizing the yellow carbon quantum dot is greatly shortened, and the absolute fluorescence quantum efficiency of the synthesized yellow carbon quantum dot is high. The yellow carbon quantum dot prepared by the method provided by the invention has very stable fluorescence property in an ethanol solution, and reduction in the fluorescence intensity of the yellow carbon quantum dot is not observed within35 days. According to the