Promising Tb3+-doped gallium tungsten-phosphate glass scintillator: Spectroscopy, energy transfer and UV/X-ray sensing
Promising Tb3+-doped gallium tungsten-phosphate glass scintillator: Spectroscopy, energy transfer and UV/X-ray sensing
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DOI：
10.1016/j.jallcom.2022.164016
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发表时间：
2022-02-08
影响因子：
6.2
通讯作者：
de Camargo, Andrea S. S.
中科院分区：
文献类型：
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作者：
Lodi, Thiago A.;dos Santos, Jessica F. M.;de Camargo, Andrea S. S.
在NaPO_3-Ga_2 O_3-Na_2 WO_4新组成系统中，制备了未掺杂和Tb ~（3+）掺杂（0.5-10 mol%）的镓钨磷酸盐玻璃，并通过紫外-可见吸收光谱、光致发光激发和发射光谱、激发态衰减测量和X射线激发的辐射发光测量进行了表征。利用Inokuti-Hirayama模型分析了Tb ~（3+）~ 5D_3能级的衰减曲线，研究了Tb ~（3+）~ 5D_3能级的离子间能量传递，发现影响Tb ~（3+）~ 5D_3能级的能量传递过程与偶极-偶极相互作用有关。此外，成功地采用理论模型来建立由于绿色与蓝色发射比（IG/IB）的变化而引起的发射颜色变化之间的相关性。在紫外和X射线激发下测量了未掺杂和Tb 3+掺杂玻璃的发射光谱。从紫外传感的角度来看，掺杂高达7.0摩尔%的Tb 3+的样品不存在可见光发射猝灭，而X射线传感是不容易淬灭在所有高达10摩尔%的Tb 3+掺杂。这些与相对高密度相关的特性突出了这些玻璃作为X射线反射器的潜力。(C)2022爱思唯尔有限公司版权所有。
Undoped and Tb3+-doped (0.5-10 mol%) gallium tungsten-phosphate glasses, in the new compositional system NaPO3-Ga2O3-Na2WO4, were prepared and characterized by UV-visible absorption, photoluminescence excitation and emission, excited state decay measurements and X-ray excited radioluminescence measurements. A detailed study of ion-ion energy transfer, based on the analysis of decay curves by the Inokuti-Hirayama model, indicated that the energy transfer process affecting the emitting level 5D3 of Tb3+ is related to dipole-dipole interaction. Additionally, a theoretical model was successfully employed to establish a correlation between the emission color variation due to changes in the green to blue emission ratio (IG/IB). The emission spectra of the undoped and Tb3+-doped glasses were measured under UV and X-ray excitation. From the viewpoint of UV-sensing, samples doped with up to 7.0 mol% Tb3+ do not present visible emission quenching, whereas X-ray sensing is not prone to quenching at all up to 10 mol% Tb3+ doping. These characteristics, associated to a relatively high density, highlight the potential of these glasses as X-ray scintillators. (C) 2022 Elsevier B.V. All rights reserved.