机构:
Vilnius State Univ, Semicond Phys Dept, LT-10222 Vilnius, Lithuania
Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, LithuaniaInst Scintillat Mat, UA-61001 Kharkov, Ukraine
Dobrovolskas, D.
[3
,4
]
Vaitkevicius, A.
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h-index: 0
机构:
Vilnius State Univ, Semicond Phys Dept, LT-10222 Vilnius, Lithuania
Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, LithuaniaInst Scintillat Mat, UA-61001 Kharkov, Ukraine
Vaitkevicius, A.
[3
,4
]
Tamulaitis, G.
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机构:
Vilnius State Univ, Semicond Phys Dept, LT-10222 Vilnius, Lithuania
Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, LithuaniaInst Scintillat Mat, UA-61001 Kharkov, Ukraine
Spatial distribution of cations;
Confocal microscopy;
Micro-pulling down technique;
Oxides;
Shaped crystals;
SINGLE-CRYSTALS;
LUMINESCENCE;
D O I:
10.1016/j.jcrysgro.2014.11.036
中图分类号:
O7 [晶体学];
学科分类号:
0702 ;
070205 ;
0703 ;
080501 ;
摘要:
Ce-doped Lu(2x)Gd(2-2)xSiO(5) (LGSO:Ce) fiber-shaped crystals (x = 0.5) were grown by the micro-pulling down (mu-PD) technique. To optimize the activator concentration for achieving the best scintillation parameters, the cerium concentration in the melt was varied in the range from 0.01 to 1.5 at.%. Distributions of Gd3+ and Ce3+ in LGSO:Ce crystals grown by the mu-PD and Czochralski (Cz) techniques were compared. The spatial distribution of cations across the LGSO:Ce scintillation crystals grown by the mu-PD technique is studied using wide-field microscopy under simultaneous excitation of two types of Ce-related centers and confocal microscopy under the selective excitation of Ce3+ in CeO6 crystallographic sites. It is revealed that the fiber-shaped crystals contain a single crystal core surrounded by crystalline material with a higher density of inclusions and cracks that are predominantly directed along the crystal axis. The formation of inclusions and cracks is interpreted by a nonuniform radial distribution of LGSO: CE cations. (C) 2014 Elsevier B.V. All rights reserved.
机构:
Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
Nihon Kessho Kogaku Co Ltd, Gunma 3740047, JapanTohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
Totsuka, Daisuke
Yanagida, Takayuki
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机构:
New Ind Creat Hatchery Ctr NICHe, Aoba Ku, Sendai, Miyagi 9808579, JapanTohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
Yanagida, Takayuki
Fujimoto, Yutaka
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机构:
Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
Fujimoto, Yutaka
Pejchal, Jan
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机构:
Acad Sci Czech Republ, Inst Phys, Prague 16253 6, Czech RepublicTohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
Pejchal, Jan
Yokota, Yuui
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机构:
Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan