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Solvent-controlled synthesis of multicolor photoluminescent carbon dots for bioimaging

机译：溶剂控制的用于生物成像的多色光致发光碳点的合成

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Multicolor fluorescent carbon dots (CDs) have potential applications in multichannel detection and multicolor imaging. In this study, multicolor fluorescent CDs were synthesized by changing the solvent type and adjusting the reactant ratio. The four prepared CDs emitted bright and stable blue (B-), green (G-), yellow (Y-), and red (R-) fluorescence under a single UV light ( λ _(ex) = 365 nm). The photoluminescence (PL) emission wavelengths changed from 445 nm for B-CDs to 620 nm for R-CDs, and therefore covered the entire visible spectrum. The absolute quantum yields for the B-, G-, Y-, and R-CDs were 27.3%, 31.1%, 22.9%, and 8.8%, respectively. Characterization of the CDs showed that the differences among the optical features of the four prepared CDs arise from the differences among the surface states and nitrogen-derived structures in the carbon core. The four prepared CDs all showed low toxicity and steady PL, and therefore have potential applications in both in vitro and in vivo imaging.
机译：多色荧光碳点（CD）在多通道检测和多色成像中具有潜在的应用。在这项研究中，通过改变溶剂类型和调整反应物比率合成了多色荧光CD。四个准备好的CD在单个UV光（λ_（ex）= 365 nm）下发出明亮而稳定的蓝色（B-），绿色（G-），黄色（Y-）和红色（R-）荧光。光致发光（PL）发射波长从B-CD的445 nm更改为R-CD的620 nm，因此覆盖了整个可见光谱。 B-，G-，Y-和R-CD的绝对量子产率分别为27.3％，31.1％，22.9％和8.8％。 CD的表征表明，四种制备的CD的光学特征之间的差异是由碳核中表面状态和氮衍生结构之间的差异引起的。制备的四张CD均显示出低毒性和稳定的PL，因此在体外和体内成像中都有潜在的应用。

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