Improved scintillation time response in (Lu0.5Gd0.5)2O3 : Eu3+ compared with Lu2O3 : Eu3+ transparent ceramics

Improved scintillation time response in (Lu0.5Gd0.5)2O3 : Eu3+ compared with Lu2O3 : Eu3+ transparent ceramics
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DOI：
10.1088/0022-3727/44/23/235101
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发表时间：
2011-06
期刊：
Journal of Physics D: Applied Physics
影响因子：
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通讯作者：
H. Rétot;S. Blahuta;A. Bessière;B. Viana;B. Lacourse;E. Mattmann
H. Rétot;S. Blahuta;A. Bessière;B. Viana;B. Lacourse;E. Mattmann
中科院分区：
其他
文献类型：
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作者：
H. Rétot;S. Blahuta;A. Bessière;B. Viana;B. Lacourse;E. Mattmann

文献摘要

被引文献

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研究了两种半氧化物陶瓷Lu2O3: Eu3+和（Lu0.5Gd0.5）2O3: Eu3+的闪烁特性。两种陶瓷都具有相当的透明度和产光率，而（Lu0.5Gd0.5）2O3: Eu3+在3-300 ms范围内的余辉减少了一个数量级。利用Eu3+的低温选择性激发，深入研究了Eu3+掺杂离子在Lu2O3和（Lu0.5Gd0.5）2O3结构的C2和S6位点的位置和行为。结果表明：(1)在C2和S6位点，（Lu0.5Gd0.5）2O3: Eu3+中的Eu3+ 4f-4f寿命都比Lu2O3: Eu3+中的短；(2)与Lu2O3相比，主体基质（Lu0.5Gd0.5）2O3有利于Eu3+在C2位点的位置。由于Eu3+在C2和S6位点的衰变时间分别为1.0 ms和3.8 ms， C2在（Lu0.5Gd0.5）2O3: Eu3+中的首选位置意味着（Lu0.5Gd0.5）2O3: Eu3+在3-20 ms范围内的衰变时间要短得多。余辉在20-300 ms范围内的减少通过热激发发光峰来说明，与Lu2O3: Eu3+相比，（Lu0.5Gd0.5）2O3: Eu3+的强度大大降低，这意味着（Lu0.5Gd0.5）2O3: Eu3+陶瓷中的电荷捕获缺陷减少。
The scintillation properties of two sesquioxides ceramics Lu2O3 : Eu3+ and (Lu0.5Gd0.5)2O3 : Eu3+ were studied. Both ceramics present comparable transparency and light yield whereas (Lu0.5Gd0.5)2O3 : Eu3+ showed an order of magnitude reduced afterglow in the 3–300 ms range. A thorough study of the location and behaviour of Eu3+ dopant ions at C2 and S6 sites of Lu2O3 and (Lu0.5Gd0.5)2O3 structures was carried out with low-temperature selective excitation of Eu3+. This revealed that (i) at both C2 and S6 sites, Eu3+ 4f–4f lifetime is shorter in (Lu0.5Gd0.5)2O3 : Eu3+ than in Lu2O3 : Eu3+, (ii) the host matrix (Lu0.5Gd0.5)2O3 as compared with Lu2O3 favours the location of Eu3+ at C2 site. As decay times of Eu3+ in C2 and S6 sites are 1.0 ms and 3.8 ms, respectively, the preferred occupation of C2 in (Lu0.5Gd0.5)2O3 : Eu3+ implies a much shorter decay time for (Lu0.5Gd0.5)2O3 : Eu3+ in the 3–20 ms range. Reduction of afterglow in the 20–300 ms range is illustrated by thermally stimulated luminescence peaks presenting a highly reduced intensity for (Lu0.5Gd0.5)2O3 : Eu3+ compared with Lu2O3 : Eu3+ implying reduced charge trapping defects in (Lu0.5Gd0.5)2O3 : Eu3+ ceramics.