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2010 , Vol. 15 >Issue 2: 120 - 124

DOI: https://doi.org/10.3724/SP.J.1077.2010.00120

研究论文

核壳结构SiO2@SrAl2Si2O8∶Eu2+粒子的制备及其性能

  • 李毅东 ,
  • 陈小博 ,
  • 艾鹏飞 ,
  • 刘应亮
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  • (暨南大学 化学系 纳米化学研究所, 广州 510632)

收稿日期: 2009-06-02

  修回日期: 2009-07-19

  网络出版日期: 2010-02-20

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Synthesis and Luminescence Properties of Mono-disperse Spherical SiO2@SrAl2Si2O8∶Eu2+ Particles with Core-shell Structure

  • LI Yi-Dong ,
  • CHEN Xiao-Bo ,
  • AI Peng-Fei ,
  • LIU Ying-Liang
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  • (Institute of Nano-chemistry, Department of Chemistry, Jinan University, Guangzhou 510632, China)

Received date: 2009-06-02

  Revised date: 2009-07-19

  Online published: 2010-02-20

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摘要

采用溶胶凝胶法制备了核壳结构SiO2@SrAl2Si2O8∶Eu2+粒子. 经1000℃煅烧，在粒径约为350～400nm的单分散SiO2微球表面包覆了一层SrAl2Si2O8∶Eu2+. 分别以X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、光致发光(PL)对合成产物进行了表征. XRD结果表明, SrAl2Si2O8∶Eu2+包覆层为六方相结构; SEM分析表明, 在进行包覆后, 核壳结构SiO2@SrAl2Si2O8∶Eu2+粒子仍然呈良好的单分散状态; TEM分析表明, 核壳结构粒子存在明显的包覆层, 其厚度约为20～30nm; 激发和发射光谱测试表明, Eu2+有效地掺入了SrAl2Si2O8基质中, 并具有良好的发光性能, SiO2@SrAl2Si2O8∶Eu2+的激发光谱峰值在361nm, 发射光谱峰值在441nm, 为Eu2+5d-4f跃迁.

关键词： SiO2@SrAl2Si2O8∶Eu2+; 核-壳结构; 溶胶-凝胶法; 蓝色荧光体

本文引用格式

李毅东 , 陈小博 , 艾鹏飞 , 刘应亮 . 核壳结构SiO2@SrAl2Si2O8∶Eu2+粒子的制备及其性能[J]. 无机材料学报, 2010 , 15(2) : 120 -124 . DOI: 10.3724/SP.J.1077.2010.00120

Abstract

Nanocrystalline SrAl2Si2O8∶Eu2+ phosphor layers were coated on non-aggregated, mono-dispersed, and spherical SiO2 particles by sol-gel process at relatively low temperature, resulting in the formation of core-shell SiO2@SrAl2Si2O8∶Eu2+ particles. X-ray diffraction, scanning electron microscope (SEM), transmission electron microscope (TEM), as well as photoluminescence were utilized to characterize the core-shell structured SiO2@SrAl2Si2O8∶Eu2+ particles. XRD analysis confirms the formation of SiO2@SrAl2Si2O8∶Eu2+ particles, it indicates that the SrAl2Si2O8∶Eu2+ phosphor layers coated on SiO2 particles are hexagonal crystal phase. SEM and TEM indicate that the roughness of the SiO2 particles’ surface obviously increases. The obtained core-shell phosphors consist of well dispersed submicron spherical particles with a narrow size distribution, and the thickness of coated layers is about 20-30nm. The core-shell particles show strong blue emission, which is ascribed to transition from 5d to 4f (around 440nm) of Eu2+ under the excitation of ultraviolet light (361nm). The excitation and emission spectra show that Eu2+ can be incorporated into SrAl2Si2O8 effectively. The study of optical properties suggest that these particles may be used in plasma display panel (PDP) device and other luminescent apparatus.

Key words： SiO2@SrAl2Si2O8∶Eu2+; core-shell structure; sol-gel process; blue phosphor

参考文献

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