Growth of Ce-doped LGSO fiber-shaped crystals by the micro pulling down technique

被引:11
|
作者
Kononets, V. [1 ,2 ]
Benamara, O. [2 ]
Patton, G. [2 ]
Dujardin, C. [2 ]
Gridin, S. [1 ,2 ]
Belsky, A. [2 ]
Dobrovolskas, D. [3 ,4 ]
Vaitkevicius, A. [3 ,4 ]
Tamulaitis, G. [3 ,4 ]
Baumer, V. [5 ]
Belikov, K. [5 ]
Sidletskiy, O. [1 ]
Lebbou, K. [2 ]
机构
[1] Inst Scintillat Mat, UA-61001 Kharkov, Ukraine
[2] Univ Lyon 1, CNRS, Inst Lumiere Mat, UMR5306, F-69622 Villeurbanne, France
[3] Vilnius State Univ, Semicond Phys Dept, LT-10222 Vilnius, Lithuania
[4] Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, Lithuania
[5] SSI Inst Single Crystals, UA-61001 Kharkov, Ukraine
关键词
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.
引用
收藏
页码:95 / 102
页数:8
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