The role of air annealing on the optical and scintillation properties of Mg co-doped Pr:LuAG transparent ceramics
The role of air annealing on the optical and scintillation properties of Mg co-doped Pr:LuAG transparent ceramics
复制标题
空气退火对Mg共掺Pr:LuAG透明陶瓷光学和闪烁性能的影响
DOI：
10.1016/j.optmat.2017.05.054
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发表时间：
2017-10-01
影响因子：
3.9
通讯作者：
Li, Jiang
中科院分区：
文献类型：
--
作者：
Hu, Zewang;Cao, Maoqing;Li, Jiang
以0.01wt%MgO为烧结助剂，采用固相反应法制备了0.2at%Pr：Lu 3Al 5 O 12（Pr：LuAG）多晶透明陶瓷。烧结态陶瓷在空气中进行不同温度的退火处理。比较了不同退火条件下的光吸收谱、光致发光谱、X射线激发发光谱和脉冲高度谱。氧空位浓度的修改被认为是管理的退火温度低于1000摄氏度的光学和闪烁响应的变化，而Pr 3+到Pr 4+的氧化在更高的温度下起着更重要的作用。高达700 ℃的空气退火是提高MgO共掺杂Pr：LuAG透明陶瓷5d-4f发射效率的有效工具。对于700 ℃退火的样品获得最高的放射性发光强度。在方差，较高的温度退火导致的5d-4f光致发光和闪烁性能的恶化，因为Pr 4+的自吸收和能量转移从Pr 3+到Pr 4+。另外，我们发现陶瓷的4f-4f慢发射在不同的辐照源下表现出不同的响应特性。(C)2017爱思唯尔B. V.保留所有权利。
Polycrystalline 0.2at%Pr:Lu3Al5O12 (Pr:LuAG) transparent ceramics were fabricated by solid-state reaction using 0.01 wt% MgO as sintering aid. The as-sintered ceramics were annealed in air at different temperatures. Optical absorption, photoluminescence, X-ray excited luminescence and pulse height spectra obtained after different annealing were compared. Modifications of the oxygen vacancy concentrations are found to govern the changes of the optical and scintillation response for annealing temperatures lower than 1000 degrees C, while the oxidation of Pr3+ to Pr4+ plays a more important role for higher temperatures. Air annealing up to 700 degrees C is an effective tool to improve the 5d-4f emission efficiency of MgO co-doped Pr:LuAG transparent ceramics. The highest radioluminescence intensity is obtained for the 700 degrees C annealed sample. At variance, higher temperature annealing leads to the deterioration of 5d-4f photoluminescence and scintillation properties because of the self-absorption of Pr4+ and energy transfer from Pr3+ to Pr4+. In addition, we find that the 4f-4f slow emission of ceramics shows different response characteristics under different irradiation sources. (C) 2017 Elsevier B.V. All rights reserved.