Abstract As an important approach for tuning the emission wavelength of graphene quantum dots (GQDs), controllable doping has attracted a great deal of attentions. Here, we reported an ultraviolet light-driven doping approach for GQDs at room temperature. N-doped graphene quantum dots (N-GQDs) are obtained via the reaction in dimethylformamide under the ultraviolet radiation. The emission wavelength can be tuned from 566 to 463 nm by controlling the doping concentration. The quantum yield of N-GQDs is demonstrated to be much higher than that of most reported GQDs and increases with the increase of the doping concentration. Finally, the synthesized N-GQDs are explored for the application in fluorescence bio-imaging.

中文翻译：

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紫外光驱动可控掺杂石墨烯量子点具有可调发射波长用于荧光生物成像

摘要 作为调节石墨烯量子点（GQDs）发射波长的重要途径，可控掺杂引起了广泛关注。在这里，我们报告了一种在室温下用于 GQD 的紫外光驱动掺杂方法。N掺杂石墨烯量子点（N-GQDs）是通过在二甲基甲酰胺中在紫外线辐射下反应获得的。通过控制掺杂浓度，可以将发射波长从 566 nm 调整到 463 nm。N-GQDs 的量子产率被证明比大多数报道的 GQDs 高得多，并且随着掺杂浓度的增加而增加。最后，探索合成的 N-GQDs 在荧光生物成像中的应用。