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首页> 外文期刊>Chemistry: A European journal >Enhanced red emission from GdF _3:Yb ~(3+),Er ~(3+) upconversion nanocrystals by Li ~+ doping and their application for bioimaging
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Enhanced red emission from GdF _3:Yb ~(3+),Er ~(3+) upconversion nanocrystals by Li ~+ doping and their application for bioimaging

机译：Li〜+掺杂增强GdF _3：Yb〜（3 +），Er〜（3+）上转换纳米晶体的红色发射及其在生物成像中的应用

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摘要

Under 980 nm near-infrared (NIR) excitation, upconversion luminescent (UCL) emission of GdF _3:Yb,Er upconversion nanoparticles (UCNPs) synthesized by a simple and green hydrothermal process can be tuned from yellow to red by varying the concentration of dopant Li ~+ ions. A possible mechanism for enhanced red upconverted radiation is proposed. A layer of silica was coated onto the surface of GdF _3:Yb,Er,Li UCNPs to improve their biocompatibility. The silica-coated GdF _3:Yb,Er,Li UCNPs show great advantages in cell labeling and in vivo optical imaging. Moreover, GdF _3 UCNPs also exhibited a positive contrast effect in T _1-weighted magnetic resonance imaging (MRI). These results suggest that the GdF _3 UCNPs could act as dual-modality biolabels for optical imaging and MRI. Dual-modality biolabels: GdF _3:Yb,Er upconversion nanoparticles (UCNPs) can be tuned in emission color from yellow to increasingly red by doping with Li ~+ ions (see figure). The red emission of silica-coated GdF _3:Yb,Er,Li UCNPs has great potential for in vivo and in vitro optical imaging, while the positive-contrast effect of their Gd ~(3+) ions allows them to be used in magnetic resonance imaging.
机译：在980 nm近红外（NIR）激发下，通过改变掺杂剂的浓度，可以将通过简单的绿色水热过程合成的GdF _3：Yb，Er上转换纳米粒子（UCNPs）的上转换发光（UCL）发射从黄色调整为红色。锂离子。提出了增强红色上转换辐射的可能机制。在GdF _3：Yb，Er，Li UCNPs的表面上覆盖一层二氧化硅，以提高其生物相容性。二氧化硅涂层的GdF _3：Yb，Er，Li UCNPs在细胞标记和体内光学成像方面显示出巨大的优势。此外，GdF _3 UCNPs在T _1加权磁共振成像（MRI）中也显示出积极的对比效果。这些结果表明，GdF _3 UCNP可以作为光学成像和MRI的双模态生物标记。双模态生物标签：GdF _3：Yb，Er上转换纳米颗粒（UCNPs）可以通过掺杂Li〜+离子从黄色变为逐渐变红的发射颜色（见图）。二氧化硅包覆的GdF _3：Yb，Er，Li UCNPs的红色发射具有体内和体外光学成像的巨大潜力，而其Gd〜（3+）离子的正对比效应使其可用于磁性共振成像。

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