
Synthesis, Fluorescence Mechanism and Patterning of Green-emissive Carbon Dots
YANG Chunyuan, CHEN Hao, ZHANG Pan, LI Fucheng, YUAN Weixiong, GUO Jiazhuang, WANG Caifeng, CHEN Su
Synthesis, Fluorescence Mechanism and Patterning of Green-emissive Carbon Dots
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.
Carbon dots / Green fluorescence / Salicylic acid / Fluorescence mechanism / Patterned printing
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