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首页> 外文期刊>Spectroscopy Letters >Synthesis and Luminescence Properties of Trivalent Rare-Earth Element-Doped Calcium Stannate Phosphors
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Synthesis and Luminescence Properties of Trivalent Rare-Earth Element-Doped Calcium Stannate Phosphors

机译：三价稀土掺杂锡酸钙磷光体的合成及发光性能

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摘要

The phosphors of calcium stannate activated with individual trivalent rare-earth element (REE) ions (Neodymium III, Europium III, Terbium III, Dysprosium III, and Samarium III) were synthesized by high-temperature solid-state reaction (SSR), and their characterization and luminescent properties were investigated. The crystal structures and morphologies of the resultant materials were well characterized by experimental techniques such as X-ray powder diffraction (XRD) and environmental scanning electron microscopy (ESEM). The XRD results display that the rare-earths substitution of Calcium II does not change the structure of calcium stannate host. Obviously, the ESEM image exhibits that phosphors aggregate and their particles with irregular shape exist. The calcined powders of the Europium III, Neodymium III, Samarium III, Dysprosium III, and Terbium III ions doped in calcium stannate exhibits bright red, reddish orange, yellowish, orange white, and green light, respectively. Although there is some intrinsic emission ranging from UV to near-infrared (NIR) due to the host lattice, the dominant signals are from the rareearth sites, with signals characteristic of the trivalent rare-earth states. The emission spectrum from undoped-calcium stannate phosphor is characterized by two broad bands centered at ~800 and ~950 nm. The shapes of the emission bands are different for each dopant. The sharp emission properties show that the calcium stannate is a suitable host for rare-earth ion-doped phosphor material. Furthermore the influence of different rare-earth dopants, that is, Europium III, Neodymium III, Samarium III, Dysprosium III, and Terbium III, on thermally stimulated luminescence (TSL) of calcium stannate phosphor under the beta irradiation was discussed. Among these trivalent rare-earth-doped phosphors samariumdoped material showed maximum TSL sensitivity with favorable glow curve shape.
机译：通过高温固态反应（SSR）合成了被单个三价稀土元素（REE）离子（钕III，EuroIII，NeIII，DyIII和SaIII）活化的锡酸钙磷光体，研究了表征和发光性质。通过诸如X射线粉末衍射（XRD）和环境扫描电子显微镜（ESEM）的实验技术很好地表征了所得材料的晶体结构和形态。 XRD结果表明，钙II的稀土取代不会改变锡酸钙主体的结构。显然，ESEM图像显示出磷光体聚集并且存在不规则形状的颗粒。掺入锡酸钙的ofⅢ，钕Ⅲ，SaⅢ，DyⅢ和TerⅢ的煅烧粉末分别显示亮红色，红橙色，淡黄色，橙白色和绿色。尽管由于主晶格存在从UV到近红外（NIR）的一些固有发射，但是主要信号来自稀土位点，具有三价稀土态的信号特征。未掺杂的锡酸钙磷光体的发射光谱的特征是两个以〜800和〜950 nm为中心的宽带。对于每种掺杂剂，发射带的形状是不同的。尖锐的发射性能表明，锡酸钙是稀土离子掺杂磷光体材料的合适基质。此外，还讨论了不同的稀土掺杂剂，即III III，钕III，Sa III，Dy III和Ter III，对β辐射下锡酸钙磷光体的热激发发光（TSL）的影响。在这些三价稀土掺杂的磷光体中，掺mar材料显示出最大的TSL灵敏度和良好的辉光曲线形状。

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