Rare-Earth Doped Sol-Gel Silicate Glasses for Scintillator Applications
Rare-Earth Doped Sol-Gel Silicate Glasses for Scintillator Applications
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用于闪烁体应用的稀土掺杂溶胶-凝胶硅酸盐玻璃
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
R. Francini
中科院分区：
文献类型：
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作者：
N. Chiodini;M. Fasoli;M. Martini;F. Morazzoni;E. Rosetta;R. Scotti;G. Spinolo;A. Vedda;M. Nikl;N. Solovieva;A. Baraldi;R. Capelletti;R. Francini
对0.1mol%Ce和3mol%Gd掺杂的SiO_2溶胶-凝胶玻璃和(0.1mol%Ce，3mol%Gd)共掺杂样品进行了辐射、光和热激发发光(RL，PL，TSL)测量。在SiO_2：0.1mol%Ce的RL中观察到了峰值约为2.7 eV的Ce3☎5d-4f发射，而在SiO_2：3mol%Gd中观察到了以3.97 eV为中心的典型的Gd_3☎的6P-8S发射。共掺杂样品同时显示出5d-4fCe3☎和6P-8sGd3☎发射，与单掺杂玻璃相比，发射强度降低。此外，在共掺杂玻璃中，两种稀土离子的光致发光时间衰减模式均呈非指数依赖关系，并显著缩短。为了解释这种效应，提出了两个稀土离子激发态的非辐射去激发，涉及到能量转移到缺陷能级。双向Gd3☎↔Ce3☎能量转移也可能发生。互补的TSL测量表明，在100K和220K附近存在较宽的发光峰。TSL光谱是稀土离子发射的特征。
Radio-, photo- and thermally stimulated—luminescence (RL, PL, TSL) measurements have been performed on SiO2 sol-gel glasses doped by 0.1 mol% Ce and 3 mol% Gd, and on (0.1 mol% Ce, 3 mol% Gd) co-doped samples. Ce3☎ 5d-4f emission peaking at about 2.7 eV has been observed in the RL of SiO2: 0.1 mol% Ce, while the typical 6P-8S emission of Gd3☎ centred at 3.97 eV has been detected in SiO2: 3 mol% Gd. The co-doped sample displays both 5d-4f Ce3☎ and 6P-8S Gd3☎ emissions with reduced intensities with respect to those observed in the singly doped glasses. Moreover, in co-doped glasses the PL time decay patterns of both rare earth ions show a non exponential dependence and are significantly shortened. To explain such an effect non radiative de-excitation of both RE ions excited states involving energy transfers to defect levels is suggested. Bidirectional Gd3☎ ↔ Ce3☎ energy transfers could also occur. Complementary TSL measurements put in evidence the existence of broad glow peaks at about 100 K and 220 K. The TSL spectra feature the RE ions emissions.