Shaped single crystal growth and scintillating application of Yb:(Gd,Lu)3(Ga,Al)5O12 solid solutions |
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Authors: | A. Novosselov A. Yoshikawa H. Ogino M. Nikl J. Pejchal T. Fukuda |
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Affiliation: | a Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;b Institute of Physics AS CR, Cukrovarnicka 10, 162 53, Prague, Czech Republic |
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Abstract: | Shaped single crystals of (Yb0.05LuxGd0.95−x)Ga5O12 (0.0x0.9) and Yb0.15Gd0.15Lu2.7(AlxGa1−x)O12 (0.0x1.0) 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)3(Ga,Al)5O12 are formed. Measured optical absorption spectra of the samples show 4f–4f transitions related to Gd3+ ion at 275 and 310 nm, and also an onset of charge transfer transitions from oxygen ligands to Gd3+ or Yb3+ cations below 240 nm. 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 Lu1.5Gd1.5Ga5O12 an intense defect––host lattice-related emission, which achieve of about 40% integrated intensity compared with Bi4Ge3O12, was found. |
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Keywords: | Garnet Solid solutions Single crystal growth Characterization Yb3+ |
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