硅酸盐学报

Ca2+、Mg2+固溶Ba2SiO4:Eu2+荧光增强机理

作者：高明远1 罗岚1 2 汪雨1 郭锐1

单位：(1. 南昌大学材料科学与工程学院南昌 330031 2. 南昌大学江西省轻质高强结构材料重点实验室南昌 330031)

分类号：TB332

出版年,卷(期):页码：2020,48(2):0-0

DOI：

摘要：

采用高温固相法在还原气氛得到(Ba1–xMex)1.95SiO4:0.05Eu (Me=Ca, Mg)荧光粉。采用X射线衍射仪、场发射扫描电镜、元素分析仪、荧光光谱仪对样品进行分析，结果表明：Ca2+、Mg2+在Ba2SiO4相的固溶度分别为10%(摩尔分数，下同)和30%，其对应荧光粉比Ba2SiO4:Eu在紫外激发绿色荧光亮度有明显提高(365 nm激发下亮度为Ba2SiO4:Eu的110%、140%，254 nm激发下则为105%、125%)。(Ba1–xCax)1.95SiO4 (0.1<x≤0.3)为T相而非Ba2SiO4相，故离子半径与Ba2+更接近的Ca2+反而比Mg2+在Ba2SiO4相的固溶度更低；Ca2+、Mg2+在Ba2SiO4中固溶，使得晶格参数略微减小，且b比c减小更快，即Ca2+、Mg2+更倾向取代9配位Ba2+(II)而非10配位Ba2+(I)；固溶有利于粉末结晶状况提高(衍射峰增强、半峰宽变窄)。Eu2+(I)比Eu2+(II)对绿光贡献更大，Ca2+、Mg2+可促进Eu2+(I)/Eu2+(II)比值提高。Eu4d高分辨光电子谱表明，Ca2+、Mg2+对Eu离子的价态无明显影响。由此可见，Ca2+、Mg2+固溶可提高Ba2SiO4相粉末结晶程度、促进Eu2+进入发光效率更高Ba2+(I)位置，同时不影响Eu2+的价态稳定性，是固溶提升Ba2SiO4:Eu荧光粉发光性能原因所在。

基金项目：

国家重点研发计划(2016YFB0701201，2016YFB0701203，2017YFB1103701)；国家自然科学基金(11564025，51671101，51464034，51062003)；江西省自然科学基金(20161ACB21003，20132BAB202010，2010GZW0016)；江西省教育厅重点计划(GJJ150010)项目资助；南昌大学研究生创新专项基金(CX2019052)本科生创新创业训练项目(20190402352)。

作者简介：

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