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首页> 外文期刊>RSC Advances >Enhanced upconversion luminescence and modulated paramagnetic performance in NaGdF4:Yb, Er by Mg2+ tridoping
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Enhanced upconversion luminescence and modulated paramagnetic performance in NaGdF4:Yb, Er by Mg2+ tridoping

机译：通过MG2 +缩略，增强了NAGDF4：YB，ER中的上变频发光和调制的顺磁性性能

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In this work, a new strategy to enhance upconversion emission has been realized for the first time, based on β-NaGdF _(4) :Yb ~(3+) , Er ~(3+) nanocrystals (UCNC) using tridoping with magnesium (Mg ~(2+) ) ions. X-ray diffraction (XRD) and inductively coupled plasma–atomic emission spectroscopy data indicated successful incorporation of the Mg ~(2+) ions in β-NaGdF _(4) :Yb ~(3+) , Er ~(3+) . The effect of the Mg ~(2+) tridopant on the crystal structure, upconversion luminescence, and paramagnetization in β-NaGdF _(4) :Yb ~(3+) , Er ~(3+) was investigated in detail. The red, green and violet emission intensities were clearly enhanced and the maximum emission intensities were enhanced by about 9, 6, and 7 times, respectively, by tridoping with 13.5 mol% Mg ~(2+) ions. The possible mechanism for enhancing upconversion emission was determined by the alteration of inter-ionic distance and the distortion of crystal structure based on the XRD data. The paramagnetic property can be modulated by the introduction of Mg ~(2+) ions and the core–shell structure, and this can be ascribed to the change in the gadolinium molar percentage. Additionally, a synergistic effect on emission intensity enhancement was observed in a Mg ~(2+) -doped core–shell structure. At last, an improved ligand exchange method has been designed to render oleic acid-stabilized 13.5 mol% Mg ~(2+) -doped UCNCs dispersible in water and their three day cytotoxicity was assayed using stem cells. It is expected that this material could be applied in biomedical nanoprobes, bioseparation, magnetic resonance imaging, and so on.
机译：在这项工作中，基于β-nagdf _（4）：Yb〜（3+），ER〜（3+）纳米晶（UCNC）使用千烷酸缩略，首次实现了一种增强上增强发射的新策略（mg〜（2+））离子。 X射线衍射（XRD）和电感耦合等离子体 - 原子发射光谱数据表明，在β-NagdF _（4）中的Mg〜（2+）离子的成功结合（4）：Yb〜（3+），ER〜（3+） 。详细研究了Mg〜（2+）在晶体结构，上变发光和副血征中的晶体结构的影响：YB〜（3+），ER〜（3+）。通过缩略13.5mol％Mg〜（2+）离子，清楚地提高了红色，绿色和紫色排放强度，最大排放强度分别提高了约9,6和7次。通过基于XRD数据的晶体结构的间离子距离和晶体结构的变形来确定用于增强上变速发射的可能机制。可以通过引入Mg〜（2+）离子和核心壳结构来调节顺磁性性质，这可以归因于钆摩尔百分比的变化。另外，在Mg〜（2+）的核壳结构中观察到对发射强度增强的协同效应。最后，设计了一种改进的配体交换方法，使油酸稳定的13.5mol％Mg〜（2+） - 可分散在水中的掺杂UCNC，并且使用干细胞测定其三天细胞毒性。预期该材料可应用于生物医学纳米软木，生物分离，磁共振成像等。

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