Effect of surface modification on photoluminescence properties of Y3Al5O12:Ce3+, Gd3+ nano-phosphors.
Effect of surface modification on photoluminescence properties of Y3Al5O12:Ce3+, Gd3+ nano-phosphors.
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DOI：
10.1016/j.saa.2011.01.002
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
Jie Li;Junfu Zhao;He-feng Zhou;Jianwei Liang;Xuguang Liu;Bingshe Xu
中科院分区：
文献类型：
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作者：
Jie Li;Junfu Zhao;He-feng Zhou;Jianwei Liang;Xuguang Liu;Bingshe Xu
本研究以聚乙烯吡咯烷酮为改性剂，采用简单的湿化学工艺制备了一系列Y3Al5O12:Ce3+、Gd3+纳米荧光粉。采用X射线衍射和红外光谱对不同质量分数聚乙烯吡咯烷酮制备的Y3Al5O12:Ce3+、Gd3+纳米荧光粉的晶体结构和键合结构进行了表征。通过差热分析和热重分析研究了添加1.37wt%聚乙烯吡咯烷酮的干燥前体凝胶的分解过程。研究了表面修饰对样品光致发光性能的影响。结果表明，聚乙烯吡咯烷酮的空间位阻效应使得添加适当重量百分比的聚乙烯吡咯烷酮制备的Y3Al5O12:Ce3+、Gd3+纳米荧光粉具有较高的分散性和良好的结晶度。添加聚乙烯吡咯烷酮有利于样品的光致发光增强，这归因于聚乙烯吡咯烷酮分子促进了Ce3+和Gd3+掺入Y3Al5O12纳米晶中以及对纳米粒子的表面钝化。
In this study, a series of Y3Al5O12:Ce3+, Gd3+nano-phosphors were prepared using a simply wet chemical process with polyvinyl pyrrolidone as a modifier. The crystal and bonding structures of Y3Al5O12:Ce3+, Gd3+nano-phosphors prepared with different weight percentages of polyvinyl pyrrolidone were characterized by X-ray diffractometry and infrared spectrometry. The decomposition process of dried precursor gel with adding 1.37wt% polyvinyl pyrrolidone was investigated by differential thermal and thermogravimetric analysis. The effect of surface modification on photoluminescence properties for the samples was studied. The results show that the steric hindrance effect of polyvinyl pyrrolidone leads to high dispersion and good crystallinity of Y3Al5O12:Ce3+, Gd3+nano-phosphors prepared with adding a proper weight percentages of polyvinyl pyrrolidone. Adding polyvinyl pyrrolidone is beneficial for the photoluminescence enhancement of the samples, which is attributed to the promotion of the incorporation of Ce3+and Gd3+into the Y3Al5O12nanocrystal and the surface passivation of the nano-particles by the polyvinyl pyrrolidone molecules.