硅酸盐学报

核壳结构NaYF4基上转换材料的制备与性能

作者：李华1 李霞1 2 乔新洁1

单位：(1.青岛科技大学材料科学与工程学院山东青岛 266042 2. 广东四通集团股份有限公司广东潮州 521011)

分类号：O 613.72

出版年,卷(期):页码：2019,47(7):0-0

DOI：

摘要：

采用溶剂热法成功的制备出了不同核壳结构NaYF4基上转换发光材料。利用X射线衍射、透射电子显微镜和荧光光谱等对产物进行表征，探讨反应时间对核壳结构纳米粒子发光强度的影响。结果表明：α-NaYF4@β-NaLuF4:Yb,Er纳米粒子的发光强度随反应时间的增加越来越强，反应时间为24 h时，成功制备出尺寸约为50 nm的核壳纳米粒子，并且随着反应时间延长六方相晶体的衍射峰强度逐渐增高，发光强度逐渐增强。活性壳α-NaYF4:Yb, Er@β-NaLuF4:Yb纳米粒子的发光强度比惰性壳α-NaYF4:Yb,Er@β-NaLuF4纳米粒子的发光强度高，这得益于活性壳层包含敏化剂Yb3+，敏化剂可以吸收激发能量，并将能量传递给核内的激活剂，从而提高材料的发光强度。

NaYF4-based up-conversion material with a core-shell structure was prepared by a solvothermal method. The product was characterized by X-ray diffraction, transmission electron microscopy and fluorescence spectroscopy. The effect of reaction time on the luminescence intensity of core-shell nanoparticles was investigated. The results show that the luminous intensity of α-NaYF4@β-NaLuF4:Yb, Er nanoparticles increases with the increase of reaction time. The core-shell nanoparticles with the size of 50 nm were prepared at the reaction time of 24 h. The intensity of the diffraction peaks of the hexagonal phase crystals increases and the emission intensity increases with increasing the reaction time. Compared to the inert shell α-NaYF4:Yb, Er@β-NaLuF4 nanoparticles, the active shell α-NaYF4:Yb,Er@β-NaLuF4:Yb nanoparticles have a higher luminous intensity due to the active shell containing the sensitizer Yb3+. The sensitizers can absorb excitation energy and transfer energy to nucleus activators, thereby increasing the luminescence intensity.

基金项目：

国家自然科学基金项目(51372127，51072086)；广东省扬帆计划项目(2015YT02C089)资助

作者简介：

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