Effect of reducing Lu3+ content on the fabrication and scintillation properties of non-stoichiometric Lu3-xAl5O12:Ce ceramics
Effect of reducing Lu3+ content on the fabrication and scintillation properties of non-stoichiometric Lu3-xAl5O12:Ce ceramics
复制标题
降低Lu3含量对非化学计量Lu3-xAl5O12:Ce陶瓷制备和闪烁性能的影响
DOI：
10.1016/j.optmat.2016.06.006
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发表时间：
2017
影响因子：
3.9
通讯作者：
Nikl Martin
中科院分区：
文献类型：
--
作者：
Liu Shuping;Mares Jiri A.;Babin Vladimir;Hu Chen;Kou Huamin;D'Ambrosio Carmelo;Pan Yubai;Nikl Martin
采用固相反应法制备了Lu_3-−_xAl_5O_(12)：Ce光学陶瓷(Lu_3-−_xAG：Ce，x~(3+)=1，2，3，4at.%)，其中Lu~(3+)组分低于化学计量比1~4at.%。研究了Lu~(3+)缺乏对非化学计量比Lu_3-−_xAl_5O_(12)：Ce陶瓷的光学、发光和闪烁性能的影响。发现材料致密化的显著影响导致了这些陶瓷的透明度、辐射发光(RL)和闪烁响应的强烈变化。在1-4at.%的Lu3+缺陷量范围内，有效地抑制了LuAlantiite缺陷，Lu3−XAG：Ce陶瓷表现出极高的RL强度，达到∼的4倍，是最新商品化的LuAG：Ce单晶的4倍，但透明度恶化。用扫描电子显微镜、背散射电子成像仪和热释光技术分别对闪烁机理中的微观结构、异相的存在和电荷陷阱进行了表征。
Lu3−xAl5O12:Ce optical ceramics (Lu3−xAG:Ce, x = 1, 2, 3 and 4 at.%, respectively) with Lu3+compositions ranging from 1 to 4 at.% below stoichiometry content were fabricated by solid state reaction method and further optimized by an air-annealing process. The effect of Lu3+deficiency on the optical, luminescence and scintillation properties of such a non-stoichiometric Lu3−xAl5O12:Ce ceramics was investigated. Significant influence in the material densification was found leading to strong changes in the transparency, radioluminescence (RL) and scintillation response of these ceramics. Within the range of 1–4 at.% Lu3+deficiency, LuAlantisite defects were suppressed effectively and the Lu3−xAG:Ce ceramics displayed an extremely high RL intensity which reaches ∼4 times higher than that of the latest commercial LuAG:Ce single crystals while its transparency deteriorated. The microstructure, presence of foreign phases and charge traps acting in scintillation mechanism were also characterized by means of SEM, back scattered electron imaging and thermoluminescence techniques, respectively.