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RbLn₂F₇的水热合成及RbLn₂F₇∶Eu³⁺（Ln=Gd,Y）的VUV光谱

Hydrothermal Synthesis of RbLn₂F₇ and VUV Spectroscopy of RbLn₂F₇: Eu³⁺（Ln=Gd,Y）

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【Author】 You Fangtian~(1*),Huang Shihua~1,Wang Dawei~1,Huang Yan~2,Xu Jianhua~2 (1.Key Laboratory of Luminescence and Optical Information,Ministry of Education,Institute of Optoelectronic Technology,Beijing Jiaotong University,Beijing 100044,China;2.Beijing Synchrotron Radiation Laboratory,Institute of High Energy Physics,Beijing 100039,China)

【机构】发光与光信息教育部重点实验室北京交通大学光电子技术研究所；中国科学院高能物理研究所同步辐射实验室；中国科学院高能物理研究所同步辐射实验室北京100044；北京100044；北京100039；

【摘要】利用水热方法合成出RbLn2F7(Ln=Gd,Y,Er,Yb和Lu),均为六方RbEr2F7型结构。掺杂Eu3+离子样品的光谱表明水热产物中氧杂质含量极低。在RbGd2F7∶Eu3+(0.5mol%)的激发光谱中只观测到Gd3+离子f-f跃迁,Eu3+离子的激发跃迁很弱。激发Gd3+离子到6IJ能级后,观测到Eu3+离子的特征发射,Gd3+离子与Eu3+离子之间存在能量传递过程。Eu3+离子的5D0→7F1和5D0→7F2跃迁发射较强,表明稀土离子在六方RbLn2F7中处于非中心对称的格位。更多还原

【Abstract】 RbLn₂F₇（Ln=Gd,Y,Er,Yb and Lu）,crystallized in the hexagonal RbEr₂F₇ structure type,was synthesized by a hydrothermal method.The excitation spectra of Eu³⁺-doped RbGd（Y）₂F₇ suggest that the oxygen content is very low in the samples obtained by hydrothermal synthesis.Only the f-f transitions of Gd³⁺ ions are observed in the excitation spectrum of RbGd₂F₇∶Eu³⁺（0.5 mol%）,while those of Eu³⁺ ions do not appear.When the Gd³⁺ ions are excited,the absorbed energy is transferred efficiently from Gd³⁺ to Eu³⁺.The spectra show that the doped Eu³⁺ ions are located in non-centrosymmetric sites in hexagonal RbLn₂F₇.更多还原