A study of Mg2+ ions effect on atoms segregation, defects formation, luminescence and scintillation properties in Ce3+ doped Gd3Al2Ga3O12 single crystals

被引：23

作者：

Bartosiewicz, Karol ^{[1
,2
]}

Markovskyi, Anton ^{[1
,3
]}

Horiai, Takahiko ^{[2
]}

Szymanski, Damian ^{[4
]}

Kurosawa, Shunsuke ^{[2
,5
,7
]}

Yamaji, Akihiro ^{[2
]}

Yoshikawa, Akira ^{[2
,5
,6
]}

Zorenko, Yuriy ^{[1
]}

机构：

[1] Kazimierz Wielki Univ Bydgoszcz, Inst Phys, Powstancow Wielkopolskich 2, PL-85090 Bydgoszcz, Poland

[2] Tohoku Univ, Inst Mat Res, 2-1-1 Katahira Aoba Ku, Sendai, Miyagi 9808577, Japan

[3] Kazimierz Wielki Univ Bydgoszcz, Mechantron Dept, Kopernika 1, PL-85074 Bydgoszcz, Poland

[4] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland

[5] Tohoku Univ, New Ind Creat Hatchery Ctr, Aoba Ku, 6-6-10 Aoba, Sendai, Miyagi 9808579, Japan

[6] C&A Corp, T Biz, Aoba Ku, 6-6-40 Aoba, Sendai, Miyagi 9808579, Japan

[7] Yamagata Univ, Facil Sci, 1-4-12 Kojirakawa Machi, Yamagata 9908560, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 905卷

基金：

日本学术振兴会;

关键词：

Single crystal; Mg2+ codoping; GAGG:Ce; Atoms segregation; Defects; LOW-TEMPERATURE THERMOLUMINESCENCE; SPECTROSCOPIC PROPERTIES; CZOCHRALSKI GROWTH; GA; PERFORMANCE; VACANCIES; GAGGCE; CA; AL;

D O I：

10.1016/j.jallcom.2022.164154

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The undoped, Mg2+ doped, Ce3+ doped as well as Mg2+:Ce3+& nbsp;codoped Gd3Al2Ga3O12 crystals were grown from the melt by the micro-pulling down method. Ce3+ and Mg2+& nbsp;ions were codoped in a wide concentration range. A study of Mg2+& nbsp;ion concentration effect on the luminescence and scintillation properties as well as segregation of atoms and defects creation processes were carried out. Mg2+& nbsp;doping in Gd3Al2Ga3O12 led to the creation of O-O(center dot)& nbsp;defects localized next to Mg2+& nbsp;sites due to charge imbalance compensation. Consequently, neutral (MgGa/Al/GdOO)(x) defects were formed. In Ce3+& nbsp;doped crystals, Mg2+& nbsp;codoping changed the valence state from Ce3+& nbsp;to Ce4+ to maintain charge neutrality. Hence, additional neutral (Ce-Gd(center dot)-Mg-Ga/Al/Gd')(x) and (Ce-Gd-MgGa/Al/GdOO)(x) defects appeared. Moreover, Mg(2+& nbsp;)induced charge imbalance in GAGG crystal might also be compensated by the formation of oxygen vacancies (V-O(center dot center dot)). The Mg2+& nbsp;ions imposed defects deteriorated the segregation of atoms. Accordingly the radial inhomogeneity of the crystals was diminished. The presence of stable Ce4+ and defects imposed by Mg2+& nbsp;ions codoping were proved by absorption, photoluminescence, and scintillation decay time analysis. Hence, Mg2+& nbsp;codoping resulted in quenching of the Ce3+& nbsp;luminescence, acceleration of scintillation response, reduction of light yield, and thermally stimulated luminescence. The mechanism explaining a strong luminescence quenching with increasing Mg2+& nbsp;ions concentration was proposed. (C)& nbsp;2022 Elsevier B.V. All rights reserved.

引用

页数：12