物理化学学报 >> 2011, Vol. 27 >> Issue (08): 2001-2008.doi: 10.3866/PKU.WHXB20110732

材料物理化学 上一篇    下一篇

YLuAG:Ce粉体的发光及闪烁特征: 制备方法及缺陷效应

张孔1,2, 刘茜1, 苏晓彬1,2, 钟红梅1, 石云3, 潘裕柏3   

  1. 1. 高性能陶瓷和超微结构国家重点实验室, 中国科学院上海硅酸盐研究所, 上海 200050;
    2. 中国科学院研究生院, 北京 100049;
    3. 中国科学院透明光功能无机材料重点实验室, 中科院上海硅酸盐研究所, 上海 200050
  • 收稿日期:2011-03-21 修回日期:2011-05-22 发布日期:2011-07-19
  • 通讯作者: 刘茜 E-mail:qianliu@sunm.shcnc.ac.cn
  • 基金资助:

    国家高技术研究发展计划(863) (2009AA03Z437)资助项目

Effect of Defects on the Luminescence and Scintillation Property of YLuAG:Ce Phosphors Obtained by Different Synthetic Routes

ZHANG Kong1,2, LIU Qian1, SU Xiao-Bin1,2, ZHONG Hong-Mei1, SHI Yun3, PAN Yu-Bai3   

  1. 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    3. Key Laboratory of Transparent Opto-functional Inorganic Material, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
  • Received:2011-03-21 Revised:2011-05-22 Published:2011-07-19
  • Contact: LIU Qian E-mail:qianliu@sunm.shcnc.ac.cn
  • Supported by:

    The project was supported by the National High Technology Research and Development Program of China (863) (2009AA03Z437).

摘要:

采用硝酸盐热解法(NP)、碳酸氢铵共沉淀法(CP)以及柠檬酸盐燃烧法(CC)分别制备了YLuAG:Ce (Y0.600Lu2.364Al5O12:Ce0.036)荧光粉体. 通过傅里叶变换红外光谱(FTIR), X射线衍射(XRD), 透射电子显微镜(TEM), 光致发光(PL)及热释光(TL)等表征手段研究了不同方法制备粉体的反应结晶过程、晶粒形貌、激发发射光谱、闪烁性能等. 对比研究表明, 三种方法制备的YLuAG:Ce粉体其表面及体相缺陷数量及分布存在差异, 从而导致了发射光谱峰位的偏移和快慢衰减时间分量的比例变化. 粉体的热释光谱分析结果进一步显示: 不同粉体热释光谱的主发射峰峰位及强度明显不同, 从侧面说明了合成方法诱发了粉体内的缺陷, 而粉体内具有不同陷阱深度的缺陷数量及陷阱复合几率对材料发光性能有较大影响.

关键词: YLuAG:Ce荧光粉, 合成, 发光, 衰减时间, 缺陷

Abstract:

Optimized YLuAG:Ce (Y0.600Lu2.364Al5O12:Ce0.036) phosphors were synthesized by three methods: nitrate-pyrolysis (NP), co-precipitation (CP) with ammonium hydrogen carbonate, and citrate-combustion (CC). Differences in the reaction process, crystallization, morphologies, photoluminescence (PL), and scintillant performance of the three kinds of phosphors were revealed and are explained using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), PL and thermoluminescence (TL) measurements and observations. Obvious differences in the emission bands and decay times of the different phosphors prepared were found and the differences were mostly caused by the defects either on the surface or in the bulk phase of the YLuAG:Ce phosphors powders. The recorded thermoluminescence spectra of the three kinds of phosphors show a different intensity and main glow peak positions. Additionally, the thermoluminescence spectra show that the synthesis methods induce defects in the phosphors. The defects result in strong trapping process effects and a high probability of radiative recombination between the trapped holes and electrons in the final phosphor powders that were obtained using the different synthesis routes.

Key words: YLuAG:Ce phosphor, Synthesis, Luminescence, Decay time, Defect

MSC2000: 

  • O644