Hydrothermal Synthesis of RbLn2F7 and VUV Spectroscopy of RbLn2F7:Eu3+(Ln=Gd, Y)
来源期刊：JOURNAL OF RARE EARTHS2006年第4期
论文作者：Huang Yan Xu Jianhua Wang Dawei You Fangtian Huang Shihua
Key words：RbLn2F7; hydrothermal synthesis; vacuum ultraviolet (VUV); energy transfer; rare earths;
Abstract: RbLn2F7 (Ln=Gd, Y, Er, Yb and Lu), crystallized in the hexagonal RbEr2F7 structure type, is 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+ (0.5mol%), 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.
Huang Yan1，Xu Jianhua1，Wang Dawei2，You Fangtian2，Huang Shihua2
(1.Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing 100039, China;
2.Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China)
Abstract:RbLn2F7 (Ln=Gd, Y, Er, Yb and Lu), crystallized in the hexagonal RbEr2F7 structure type, is 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+ (0.5mol%), 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.
Key words:RbLn2F7; hydrothermal synthesis; vacuum ultraviolet (VUV); energy transfer; rare earths;
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