高等学校化学学报

高等学校化学学报

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棒状LaF3∶Eu3+纳米晶的制备与发光性能

刘桂霞, 苏瑞相, 王进贤, 董相廷   

  1. 长春理工大学化学与环境工程学院, 长春 130022
  • 收稿日期:2007-07-11 修回日期:1900-01-01 出版日期:2008-03-10 发布日期:2008-03-10
  • 通讯作者: 刘桂霞

Preparation and Luminescence Properties of Rod-like LaF3∶Eu3+ Nanocrystals

LIU Gui-Xia*, SU Rui-Xiang, WANG Jin-Xian, DONG Xiang-Ting   

  1. School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China
  • Received:2007-07-11 Revised:1900-01-01 Online:2008-03-10 Published:2008-03-10
  • Contact: LIU Gui-Xia

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摘要： 采用一种简单的液相反应法在室温下合成了棒状的LaF3∶Eu3+纳米晶, 对其结构和发光性能进行了表征. XRD分析结果表明, 室温下即可得到结晶良好的六方晶相的LaF3, 灼烧之后样品的衍射峰增强, 没有杂相产生. TEM照片表明, 棒状LaF3∶Eu3+纳米材料的直径为8 nm左右, 长度达到50 nm. 荧光光谱表明, 室温下合成的棒状LaF3∶Eu3+纳米晶的最强发射峰位于589 nm, 对应于Eu3+的5D0-7F1跃迁发射, 说明Eu3+占据LaF3基质中La3+晶格点的C2对称格位上. 同时Eu3+的猝灭摩尔分数为5%, 荧光寿命随着灼烧温度的升高而延长.

关键词: LaF3∶Eu3+, 纳米晶, 发光材料

Abstract: Rod-like LaF3∶Eu3+nanocrystals were synthesized by a simple liquid method at room temperature, and the properties were characterized. XRD patterns showed that the hexagonal phase LaF3 crystals with a better crystallinity were obtained at room temperature, the diffraction peaks intensities increased with the increase of annealing temperature and no impurity phase was observed. TEM images showed that the LaF3∶Eu3+ nanocrystals are in rod shape with the diameter of 8 nm and length to 50 nm. Photoluminescence properties indicated that the strongest emission peak of the obtained rod-like LaF3∶Eu3+ nanocrystal is near 589 nm, corresponding to the 5D0-7F1 transition of Eu3+, which suggests that Eu3+ is located at C2 symmetry lattice of La3+ in LaF3 host, in addition, the quenching molar fraction of Eu3+ is 5% and the lifetime increases with the increase of annealing temperature.

Key words: LaF3∶Eu3+, Nanocrystal, Luminescence material

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