绿色荧光碳点的合成、荧光机制和图案化

In this study，green-emissive carbon dots(G-CDs1)were prepared using salicylic acid and ethylenediamine as precursors through a hydrothermal method， followed by purification via dialysis and column chromatography. G-CDs1 exhibited an emission wavelength of 518 nm and a photoluminescence quantum yield (PLQY)of 22.3%. Structural characterization revealed that G-CDs1 possess a graphitic carbon core and abundant surface functional groups(—OH，—COOH，—NH₂). Comparative experiments were designed：first，blue-emissive carbon cores were obtained by hydrothermally treating salicylic acid alone；then，these cores were reacted with ethylenediamine to produce green-emissive carbon dots(G-CDs2). Comparative analysis showed that G-CDs2 and G-CDs1 shared identical fluorescence properties and structural features，revealing a“carbon core-fluorophore” synergistic emission mechanism，where green-emissive fluorophores were generated through defect passivation or surface reaction with ethylenediamine，jointly contributing to the fluorescence emission together with the carbon core. Consequently，a G-CDs1/polyvinylpyrrolidone(PVP)fluorescent ink composite was developed，enabling printed patterns with bright green fluorescence. This research contributes to the development of controllable synthesis，fluorescence mechanism，and applications of carbon dots.