| MMgF4(M=Ca,Sr, Ba)体系中Eu和Tb的电荷迁移 |
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| 引用本文： | 吴郢,石春山.MMgF4(M=Ca,Sr, Ba)体系中Eu和Tb的电荷迁移[J].化学学报,1996,54(5):468-474. |
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| 作者姓名： | 吴郢 石春山 |
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| 作者单位： | 中国科学院长春应用化学研究所;中国科学院稀土化学与物理开放实验室 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 于不同气流中, 合成了MMgF4:xEu,yTb复合氟化物磷光体。该体系中Eu^3^+和Eu^2^+共存。Tb的存在影响Eu的价态存在形式。ESR测试表明, 随Tb的掺入浓度增加, Eu^2^+的浓度呈规律性变化。随Eu的掺入, 样品的XPS谱中出现了四价铽的Tb3d5/2特征伴峰。认为Eu^3^+和Tb^3^+之间存在电荷迁移平衡。即Eu^3^++Tb^3^+=Eu^2^++Tb^4^+。通过半定量手段研究了SrMgF4中这一衡的平衡常数。
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| 关 键 词： | Ｘ射线衍射分析 氟化钙 氟化镁 电子自旋共振 铕 铽 氟化钡 氟化锶 电荷迁移 |
Electron transfer between Eu and Tb in MMgF4 systems |
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| WU YING,SHI CHUNSHAN.Electron transfer between Eu and Tb in MMgF4 systems[J].Acta Chimica Sinica,1996,54(5):468-474. |
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| Authors: | WU YING SHI CHUNSHAN |
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| Abstract: | Emission of europium(Ⅱ) and europium(Ⅱ) have been observed in SrMgF4:xEu,yTb phosphors which are synthesized in Ar or Ar/H2 flow. The valence state of Eu is influenced by terbium. It is notable that the intensities of the ESR paeaks corresponding to Eu^2^+ are regularly changed when terbium ion is incorporated. The typical Tb3d XPS spectrum belonging to Tb^4^+ is also found when Eu is codoped. This phenomena can be explained by electron transfer mechanism Eu^3^++Tb^3^+→Eu^2^++Tb^4^+. And its equilibrium constant is studied by ESR technique. |
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| Keywords: | X-RAY DIFFRACTION ANALYSIS CALCIUM FLUORIDE MAGNESIUM FLUORIDE ELECTRON SPIN RESONANCE EUROPIUM TERBIUM BARIUM FLUORIDE STRONTIUM FLUORIDE CHARGE-TRANSFER |
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