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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

YAG:Ce纳米荧光粉发光的温度依赖特性

张 凯, 刘河洲, 仵亚婷, 胡文彬   

  1. 上海交通大学金属基复合材料国家重点实验室, 上海 200240
  • 收稿日期:2007-12-07 修回日期:2008-01-25 出版日期:2008-09-20 网络出版日期:2008-09-20

Temperature Dependence of Luminescence and Decay Time of YAG:Ce Nanophosphor

ZHANG Kai, LIU He-Zhou, WU Ya-Ting, HU Wen-Bin   

  1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2007-12-07 Revised:2008-01-25 Published:2008-09-20 Online:2008-09-20

PDF (PC)

1887

被引次数

51 | 6

摘要： 用沉淀法制备了YAG:Ce纳米荧光粉. 用X射线粉末衍射仪 (XRD)、扫描电子显微镜 (SEM) 对粉体煅烧过程的相变和形貌进行了表征. 研究了80～400K范围内, YAG:Ce纳米荧光粉发光和衰减的温度依赖特性. 结果表明, 前躯体由纳米颗粒组成. 900℃煅烧时, 粉体由非晶态直接转变为YAG相. YAG:Ce的发光强度随温度的升高而减弱. YAG:Ce纳米荧光粉的衰减包含两个指数项, 长时间项反映了体相Ce3+的荧光衰减, 随着温度的升高不断减小. 短时间项反映了表面Ce3+的荧光衰减, 随着温度的升高呈下降趋势, 由于受到表面效应的影响, 中间出现小幅的阶跃.

关键词: 衰减, YAG:Ce纳米荧光粉, 温度依赖特性, 表面效应

Abstract: Ce-doped Y3Al5O12(YAG:Ce) nanophosphor was synthesized by the co-precipitation method. X-ray powder diffraction (XRD), Scanning electron microscope (SEM) were used to characterize the powders. The temperature dependences of luminescence and decay time of YAG:Ce nanophosphor were investigated in the temperature range of 80-400K. The luminescence intensity decreases with the increase of temperature, which is caused by the increase of the non-radiative relaxation rate. The decay of YAG:Ce contains two exponential terms, the long component presents decay of Ce3+ in the body, the short component reflects decay of Ce3+ on the surface. The long component decreases with the increase of temperature, while the short component shows intricate behavior, which results from effect of surface.

Key words: decay time, YAG:Ce nanophosphor, temperature dependence, surface effect

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