Ga for Al substitution effects on the garnet phase stability and luminescence properties of Gd3GaxAl5-xO12:Ce single crystals
Ga for Al substitution effects on the garnet phase stability and luminescence properties of Gd3GaxAl5-xO12:Ce single crystals
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DOI：
10.1016/j.jlumin.2019.116724
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发表时间：
2019-12-01
影响因子：
3.6
通讯作者：
Zorenko, Yu
中科院分区：
文献类型：
--
作者：
Bartosiewicz, K.;Babin, V;Zorenko, Yu
本文研究了Gd-3 (Ga,Al)(5)O-12:Ce单晶组的发光和物理性质，是对类似的（Y,Gd）(3)Al5O12:Ce和（Gd,Lu）(3)Al5O12:Ce单晶组的补充研究。这三组材料表现出相似的发光和物理性质。本研究研究了Gd-3(Ga,Al)(5)O-12:Ce单晶中Ga取代Al对石榴石相发光、闪烁特性及热力学稳定性的影响，并与（Y,Gd）(3)Al5O12:Ce和（Gd,Lu）(3)Al5O12:Ce单晶组进行了比较。Ga对Al的不平衡取代使石榴石相热力学不稳定，形成了具有紫外和可见光发光中心的多相体系。波长色散x射线光谱学、x射线粉末衍射分析、光致发光和衰变动力学测量对多相晶体的所有相类型进行了分析。采用温度相关测量来确定Ce3+发光的猝灭机制。研究了其时序特性随Ga含量的变化规律。
This research deals with the luminescence and physical properties of Gd-3 (Ga,Al)(5)O-12:Ce single crystal set and it is a complementary study to analogous (Y,Gd)(3)Al5O12:Ce and (Gd,Lu)(3)Al5O12:Ce single crystal sets. Those three groups of materials show similar luminescence and physical properties. In this research, the influence of substitution Ga for Al in Gd-3(Ga,Al)(5)O-12:Ce single crystals on the luminescence and scintillation characteristics as well as thermodynamical stability of the garnet phase is studied, and it is compared to (Y,Gd)(3)Al5O12:Ce and (Gd,Lu)(3)Al5O12:Ce single crystal sets. The unbalanced substitution Ga for Al makes garnet phase thermodynamically unstable and leads to the formation of the multiphase system with luminescence centers in UV and visible spectral ranges. The wavelength-dispersive X-ray spectroscopy, X-ray powder diffraction analysis, photoluminescence and decay kinetic measurements reviled all phase types within multiphase crystals. Temperature dependent measurements were applied to determine the quenching mechanism for Ce3+ luminescence. The timing characteristics are studied as the function of Ga content.