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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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摘要

In this work, a new strategy to enhance upconversion emission has been realized for the first time, based on beta-NaGdF4:Yb3+, Er3+ nanocrystals (UCNC) using tridoping with magnesium (Mg2+) ions. X-ray diffraction (XRD) and inductively coupled plasma-atomic emission spectroscopy data indicated successful incorporation of the Mg2+ ions in beta-NaGdF4: Yb3+, Er3+. The effect of the Mg2+ tridopant on the crystal structure, upconversion luminescence, and paramagnetization in beta-NaGdF4: Yb3+, Er3+ 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% Mg2+ 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 Mg2+ 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 Mg2+-doped core-shell structure. At last, an improved ligand exchange method has been designed to render oleic acid-stabilized 13.5 mol% Mg2+-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-NAGDF4：YB3 +，ER3 +纳米晶（UCNC）首次实现了一种增强上增强发射的新策略，使用铅与镁（Mg2 +）离子衍射。 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-NAGDF4：YB3 +，ER3 +中成功地结合Mg2 +离子。详细研究了Mg2 + r次阶段对晶体结构，上变发光和副血征的晶体结构的影响，详细研究了β-nagdF4：YB3 +，ER3 +。通过缩略13.5mol％Mg 2 +离子，清楚地增强了红色，绿色和紫色排放强度，并分别通过缩略约9,6和7次增强了约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MG2 +掺杂的核心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，以使油酸稳定的13.5mol％Mg2 + - 可分散在水中的UCNC，并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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  • 来源
    《RSC Advances》 |2016年第85期|共10页
  • 作者

    Zhao Shuwen; Liu Wei; Xue Xianya; Yang Yushi; Zhao Zhiyong; Wang Youfa; Zhou Bin;

  • 作者单位

    Wuhan Univ Technol Sch Mat Sci &

    Engn Wuhan 430070 Peoples R China;

    Cent China Normal Univ Sch Foreign Languages Wuhan 430079 Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Wuhan 430070 Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Sch Mat Sci &

    Engn Wuhan 430070 Peoples R China;

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