Shaped crystal growth and scintillating properties of Yb:(Gd,Lu)₃Ga₅O₁₂ solid solutions

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• 作者：Novosselov ; A. ; Yoshikawa ; A. ; Nikl ; M. ; Solovieva ; N. ; Lee ; J.-H. ; Fukuda ; T.
• 关键词：Garnet ; Shaped single crystal growth ; Yb³⁺ doping ; Scintillating properties
• 刊名：Radiation Measurements
• 出版年：2004
• 期刊代码：71_13504487
• 类别：ce
• 出版时间：August - December, 2004
• 卷：38
• 期：4-6
• 页码：481-483
• 文件大小：248 K

摘要

Shaped single crystals of (Lu_xGd_1−x)₃Ga₅O₁₂ (0.0≤x≤1.0) and (Yb_0.05Lu_xGd_0.95−x)₃Ga₅O₁₂ (0.0≤x≤0.9) were grown by the modified micro-pulling-down method. Continuous solid solutions with garnet structure and a linear compositional dependency of crystal lattice parameter in the system Yb:(Gd,Lu)₃Ga₅O₁₂ are formed. Measured optical absorption spectra of the samples show 4f–4f transitions related to Gd³⁺ ion at 275 and 310nm, and also an onset of charge transfer transitions from oxygen ligands to Gd³⁺ or Yb³⁺ cations below 240nm. A complete absence of Yb³⁺ charge transfer luminescence under X-ray excitation in any of the investigated samples was explained by the overlapping of charge transfer absorption of Yb³⁺ by that of Gd³⁺ ions. For specific composition of Lu_1.5Gd_1.5Ga₅O₁₂ an intense defect-host lattice-related emission, which achieve of about 40%integrated intensity compared with Bi₄Ge₃O₁₂, was found.