Yan Yang, Xia Longyu, Ma Lan
Department of Chemistry, Tsinghua University Beijing 100084 P. R. China.
Division of Life Science and Health, Tsinghua University Graduate School at Shenzhen Shenzhen 518055 P. R. China
RSC Adv. 2019 Aug 2;9(42):24057-24065. doi: 10.1039/c9ra04241e.
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 ( = 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 and imaging.
多色荧光碳点（CDs）在多通道检测和多色成像方面具有潜在应用。在本研究中，通过改变溶剂类型和调整反应物比例合成了多色荧光碳点。制备的四种碳点在单一紫外光（λ = 365 nm）下发射出明亮且稳定的蓝色（B-）、绿色（G-）、黄色（Y-）和红色（R-）荧光。光致发光（PL）发射波长从B-碳点的445 nm变化到R-碳点的620 nm，从而覆盖了整个可见光谱。B-、G-、Y-和R-碳点的绝对量子产率分别为27.3%、31.1%、22.9%和8.8%。碳点的表征表明，制备的四种碳点光学特性的差异源于碳核表面状态和氮衍生结构的差异。制备的四种碳点均表现出低毒性和稳定的PL，因此在[此处原文缺失相关内容]和[此处原文缺失相关内容]成像中均具有潜在应用。
