高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (9): 1541.

• 论文 • 上一篇    下一篇

La2CaB10O19:Ce3+在VUV-Vis范围的发光性质研究

赫泓1, 梁宏斌2, 陶冶3, 王淑彬1, 苏锵1,2   

  1. 1. 中国科学院长春应用化学研究所稀土化学与物理重点实验室, 长春 130022;
    2. 中山大学化学与化工学院, 光电材料和技术国家重点实验室, 广州 510275;
    3. 中国科学院高能物理研究所, 北京同步辐射实验室, 北京 100039
  • 收稿日期:2002-11-12 出版日期:2003-09-24 发布日期:2003-09-24
  • 通讯作者: 苏锵(1931年出生),男,研究员,博士生导师,中国科学院院士,从事稀土化学研究.E-mail:suqiang@ciac.jl.cn. E-mail:suqiang@ciac.jl.cn.
  • 基金资助:

    国家重点基础研究规划项目(批准号;G1998061312);北京同步辐射实验室重点课题(批准号:01049)资助

Luminescence Property of La2CaB10O19:Ce3+in VUV-Vis Range

HE Hong1, LIANG Hong-Bin2, TAO Ye3, WANG Shu-Bin1, SU Qiang1,2   

  1. 1. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2. State Key Laboratory of OptoelectronicMaterials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China;
    3. Laboratory of Beijing Synchrotron Radiation, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
  • Received:2002-11-12 Online:2003-09-24 Published:2003-09-24

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摘要： 通过研究La2CaB10O19:Ce3+在VUV-Vis范围的光谱.发现Ce3+在La2CaB10O19中共有两种格位.分别取代了十配位的La3+和八配位的Ca2+,从而发射光谱中没有出现特征的双峰,而出现了峰值约位于307,330和356nm的3个发射峰.由于在低对称性晶体场中d轨道的分裂.激发光谱中位于194.224,243.260,274和318nm的峰是由两个格位的Ce3+的f-d跃迁引起的.Ce3+占据两个格位,可以通过以Eu3+为荧光探针的发射光谱中出现的两个5D0-7F0跃迁得到验证.峰值位于162nm的激发谱带是基质吸收带.与基质禁带宽度相对应.通过计算,不排除其中包含O2-→Ce3+的电荷迁移带的可能性.

关键词: VUV, 发光, Ce3+, 硼酸盐, 格位

Abstract: The excitation and emission spectra of La2CaB10O19: Ce3+in VUV-Vis range were investigated. Three bands peaking at 307, 330 and 356 nm in emission spectrum and six bands peaking at 194, 224, 243, 260, 274 and 318 nm in excitation spectra are observed. This fact indicates that Ce3+ions occupy two kinds of lattice sites in La2CaB10O19, one kind is substituted for La3+with coordination number ten and the other is substituted for Ca2+with coordination number eight. This result is consistent with that of La2CaB10O19: Eu3+. When Eu3+is used as a structural probe, two 5D0→7F0transitions peaking at 576. 8 and 578. 8 nm are observed in the emission spectrum. This indicates that Eu3+ions also occupy two kinds of lattice sites in La2CaB10O19.The broad band peaking at 162 nm can be attributed to the host absorption, and the charge transition band(CTB) of O2-→Ce3+may be obscured in this broad band.

Key words: VUV, Luminescence, Ce3+, Borate, Lattice site

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