Synthesis, characterization and evaluation of scintillation properties of Eu3+-doped Gd2O3 obtained using PEG as precursor
Synthesis, characterization and evaluation of scintillation properties of Eu3+-doped Gd2O3 obtained using PEG as precursor
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DOI：
10.1016/j.jallcom.2015.06.239
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发表时间：
2015-11
影响因子：
6.2
通讯作者：
Lorena P. B. Durante;L. A. Rocha;D. P. Santos;F. Coelho;M. Schiavon;S. Ribeiro;J. L. Ferrari
中科院分区：
文献类型：
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作者：
Lorena P. B. Durante;L. A. Rocha;D. P. Santos;F. Coelho;M. Schiavon;S. Ribeiro;J. L. Ferrari
本文报道了以聚乙二醇作有机分子前驱体，以1，3，5，7E10%Eu3+为原料合成了掺杂Eu3+的Gd2O3。对前驱体的TGA和DTA分析表明，最终材料是在700℃以上热处理得到的。根据这一信息，所有材料都是在空气气氛下于烘箱中于900℃、1000℃和1100℃热处理4h后得到的。X-射线衍射仪分析表明，热处理后的材料为立方晶型，属于Gd2O3。用谢雷尔方程和威廉-霍尔法分别计算了微晶尺寸和微观应变随热处理温度和Eu3+浓度的变化关系。拉曼光谱也显示了Gd2O3相的形成，然而，在较高Eu3+浓度的光谱中，在117cmEu3+附近没有−1谱带，这表明这一条插入到基质中促进了基质中一些化学键的断裂。在波长为255 nm的氙灯和X射线光源激发下，观察到可见光区有很强的光致发光，最大光致发光位于611 nm附近。观察到的发射归因于Eu3+的构型内f-f跃迁。5D0激发态的寿命值在2.84~2.89毫秒之间，表明Eu3+在晶体体系中的位置。这一结果表明该材料在紫外线吸收系统、太阳能电池、产生图像的设备和闪烁系统中具有潜在的应用前景。
This work reports on the synthesis of Eu3+-doped Gd2O3using PEG as an organic molecular precursor with 1, 3, 5, 7 e 10 mol% of Eu3+. TGA and DTA analysis of the precursors obtained shows that the final materials are obtained at thermal treatment above 700 °C. Based on this information all materials were obtained after heat treatment at 900, 1000 and 1100 °C during 4 h in an oven under air atmosphere. XRD analysis showed that the materials obtained after heat-treatment presents a cubic crystalline structure assigned to the Gd2O3. Crystallite size and microstrain were evaluated using the Scherrer's equation and Williansom-Hall method, respectively, as a function of heat-treated temperature and Eu3+concentration. Raman spectroscopy also showed the formation of the Gd2O3phase, however, the absence of bands around 117 cm−1in the spectra with higher Eu3+concentration indicates that the insertion of this one in the host matrix promotes the breakdown of some chemical bonds of the matrix. Intense photoluminescence emission in the visible region with maximum localized around 611 nm under excitation at 255 nm with xenon lamp and with X-ray source were observed. The emissions observed were attributed to the intraconfigurational f–f transitions of Eu3+. The lifetime values of the5D0excited state were between 2.84 and 2.89 ms, indicating the location of Eu3+in crystalline systems. This result demonstrates the potential application of the materials in systems for absorption in the ultraviolet region, solar cells, devices generated images and scintillation systems.