期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 849, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155808
关键词
Oxides; Optical materials; Crystal growth; X-ray diffraction; Crystal structure; Defects; Optical properties; Luminescence; Phosphors
资金
- Polish National Science Centre (NCN) [2017/25/B/ST8/02932]
The luminescence, scintillation, and photoconversion properties of the single crystals of Ce3+ doped Tb3-xGdxAl5-yGayO12 (x = 0-1.5; y = 2-2.5) mixed garnets, grown by the micro-pulling-down (mu-PD) method, are investigated as a function of the Tb/Gd ratio with the aim of development of phosphor-convertors of white LED and scintillators. The partial Tb3+ substitution by Gd3+ cations leads to the suitable change of the crystal field splitting of the 5d energy levels of Ce-3 ions due to different sizes of the Gd3+ and Tb3+ cations. For this reason, the cation engineering enables to improve the luminescence and scintillation characteristics of Tb3-xGdxAl5-yGayO12 crystals due to increasing the efficiency of Gd3+ -> Tb3+ -> Ce3+ cascade energy transfer observed in these solid solutions. We have shown that from all the crystals under study, the Tb3-xGdxAl5-yGayO12:Ce (x = 1-1.5) crystal is the best promising candidate for the photoconversion and scintillation applications. (C) 2020 Elsevier B.V. All rights reserved.
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