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Influence of dispersant on Y2O3:Eu3+ powders synthesized by combustion method

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【作者】 王超男； 赵江波； 李勇； 张慰萍； 尹民；

【Author】 WANG Chaonan1,2,ZHAO Jiangbo1,2,LI Yong1,2,ZHANG Weiping1,3,YIN Min1,2 (1.Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China;2.Department of Physics,University of Science and Technology of China,Hefei 230026,China;3.Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,China)

【机构】 Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China； Department of Physics,University of Science and Technology of China； Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences；

【摘要】 Y2O3:Eu3+ powders were synthesized by combustion method and the influence of dispersant was investigated.XRD analysis indicated that the particle size increased with a small amount of dispersant firstly and then decreased with a further increase of dispersant.The morphologies of the powders were studied by scanning electron microscopy(SEM) and high-resolution transmission electron microscopy(HRTEM).SEM images revealed that an appropriate amount of dispersant could reduce the agglomeration significantly.Due to the increase of specific surface area,the charge transfer bands in the excitation spectra showed a red shift with the decrease of particle size.The emission spectra displayed that the reduction of agglomeration could enhance the luminescent intensity greatly.The decay curves of the powders were single exponential and the lifetime of 612 nm emission increased with the decrease of particle size.The two deexcitation processes were discussed,and the increase of lifetime with decreased particle size resulted from the combined effects of surface defects and effective refractive index.

【Abstract】 Y2O3:Eu3+ powders were synthesized by combustion method and the influence of dispersant was investigated.XRD analysis indicated that the particle size increased with a small amount of dispersant firstly and then decreased with a further increase of dispersant.The morphologies of the powders were studied by scanning electron microscopy(SEM) and high-resolution transmission electron microscopy(HRTEM).SEM images revealed that an appropriate amount of dispersant could reduce the agglomeration significantly.Due to the increase of specific surface area,the charge transfer bands in the excitation spectra showed a red shift with the decrease of particle size.The emission spectra displayed that the reduction of agglomeration could enhance the luminescent intensity greatly.The decay curves of the powders were single exponential and the lifetime of 612 nm emission increased with the decrease of particle size.The two deexcitation processes were discussed,and the increase of lifetime with decreased particle size resulted from the combined effects of surface defects and effective refractive index.

【关键词】 Y2O3； combustion； PEG2000； rare earths；
【Key words】 Y2O3； combustion； PEG2000； rare earths；
【基金】 supported by the National Natural Science Foundation of China (10774140);Knowledge Innovation Project of the Chinese Academy of Sciences (KJCX2-YW-M11);Specialized Research Fund for the Doctoral Program of Higher Education (20060358054);Special Foundation for Talents of Anhui Province,China (2007Z021)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2009年06期
  • 【分类号】TB383.3
  • 【被引频次】11
  • 【下载频次】42
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