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首页> 外文期刊>RSC Advances >Growth phase diagram and upconversion luminescence properties of NaLuF4:Yb3+/Tm3+/Gd3+ nanocrystals
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Growth phase diagram and upconversion luminescence properties of NaLuF4:Yb3+/Tm3+/Gd3+ nanocrystals

机译：NALUF4：YB3 + / TM3 + / GD3 +纳米晶体的生长相图和上变发光性能

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摘要

Sub-25 nm beta-NaLuF4 nanocrystals (NCs) with high homogeneity, monodispersity, and good crystallinity were synthesized through thermal decomposition at different temperatures (285, 295, 305, and 315 degrees C), using an automatic nanomaterial synthesizer. The phase transition of NaLuF4 NCs from alpha-phase to beta-phase suggests that the entire growth process consists of four stages: a cubic phase, the coexistence of cubic and hexagonal phases, a homogeneous hexagonal phase, and an inhomogeneous hexagonal phase, caused by Ostwald ripening. Based on this observation, we obtained the growth phase diagram of NaLuF4: Yb3+/Tm3+/Gd3+ NCs, relating to the reaction time, temperature, crystal size, and crystal phase. From spectral analysis, the products prepared in the third stage were shown to exhibit the characteristics of having small size (sub-25 nm), uniformity, and high upconversion luminescence (UCL) intensity. On the other hand, the luminescence properties of NaLuF4: Yb3+, Tm3+ were studied via incorporating different concentrations of Gd3+ ions. These results indicated that 10% Gd3+ was the best doping concentration for obtaining NaLuF4 NCs with relatively small size and high brightness. Further increasing the Gd3+ concentration induced a drastic decrease in UCL intensity.
机译：通过在不同温度（285,295,305和315℃）的热分解，合成具有高均匀性，单双层和良好结晶度的亚25nmβ-naluf4纳米晶体（Ncs），使用自动纳米材料合成器来合成通过不同温度（285,295,305和315℃）。从α相到β相的NALUF 4 NC的相转变表明，整个生长过程由四个阶段组成：立方相，立方体和六边形相的共存，均匀的六方相和不均匀的六方阶段，由此引起Ostwald成熟。基于该观察，我们获得了NALUF4：YB3 + / TM3 + / GD3 + NC的生长相图，与反应时间，温度，晶体尺寸和结晶相有关。从光谱分析中，显示第三阶段制备的产品表现出具有小尺寸（亚25nm），均匀性和高升高的发光（UCL）强度的特性。另一方面，通过掺入不同浓度的Gd3 +离子来研究NALUF4：YB3 +，TM3 +的发光性质。这些结果表明，10％GD3 +是获得具有相对较小尺寸和高亮度的NALUF4 NC的最佳掺杂浓度。进一步增加GD3 +浓度诱导UCL强度的急剧下降。

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  • 来源
    《RSC Advances》 |2017年第70期|共6页
  • 作者

    Li Yangyang; Dong Yanhui; Aidilibike Tuerxun; Liu Xiaohui; Guo Junjie; Qin Weiping;

  • 作者单位

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Elect Sci &

    Engn State Key Lab Integrated Optoelect Changchun 130012 Jilin Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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