高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (11): 1990.

• 研究论文 • 上一篇    下一篇

蓝色长余辉材料CaAl2O4:Eu2+,Nd3+的合成及其发光性能

王育华, 王雷, 张水合   

  1. 兰州大学物理科学与技术学院材料科学系, 兰州730000
  • 收稿日期:2005-04-08 出版日期:2005-11-10 发布日期:2005-11-10
  • 基金资助:

    国家自然科学基金(批准号:50272026)资助

Preparation of Blue Long Afterglow Phosphors CaAl2O4:Eu2+,Nd3+ and Its Luminescent Properties

WANG Yu-Hua, WANG Lei, ZHANG Shui-He   

  1. Department of Materials Science,School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China
  • Received:2005-04-08 Online:2005-11-10 Published:2005-11-10

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摘要： 采用高温固相法合成了系列单相Ca(1-x-y)Al2O4:Eu2+x,Nd3+y(0≤x≤0.045,0≤y≤0.0037)粉末样品,并表征了其发光特性.研究结果表明,样品的发射光谱为最大发射峰位于440nm的宽带谱,属于Eu2+的4f65d→4f7跃迁.通过对Eu2+,Nd3+掺杂量与样品发光性能之间关系的研究发现,Eu2+和Nd3+最佳掺杂量分别为x=0.00125和y=0.0025,并且Nd3+对改善蓝色长余辉材料CaAl4:Eu2+的余辉性能具有重要的作用.在最佳掺杂条件下,样品的余辉时间可达1000min,初始亮度大于1200mcd/m2,60min后发光粉的亮度仍然在10mcd/m2以上.利用正电子湮灭技术和热释光技术,研究了Eu2+和Nd3+对CaAl2O4:Eu2+,Nd3+材料的发光性能的影响.

关键词: 长余辉, CaAl2O4:Eu2+, Nd3+, 正电子湮没

Abstract: A series of single-phase long afterglow phosphors Ca(1-x-y)Al2O4:Eu2+x,Nd3+y(0≤x≤0.045,(0≤y≤0.0037)) were prepared by the traditional solid state reaction method and their photoluminescence were investigated.Intense blue emission of the samples was observed with a broad band peak at about 440 nm,which is due to the 4f 65d→4f 7 transition of Eu2+.The effect of different rare earth contents on the afterglow properties was investigated and the optimum content of Eu2+ and Nd3+ are x=0.001 25 and y=0.002 5 respectively.Initial brightness and persistent afterglow time of the corresponding sample is over 1 200 mcd/m2 and more than 1 000 min.60 min later,its brightness is still over 10 mcd/m2.Thermoluminescence and positron annihilation methods were used to investigate the effect of Nd3+and Eu2+ co-doping on their luminescent properties.

Key words: Long afterglow, CaAl2O4:Eu2+,Nd3+, Positron annihilation

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