Abstract In this study, nanocrystalline Gd2O3:Sm, Gd2O2S:Sm and Gd2O2SO4:Sm phosphors were successfully synthesized through the urea homogeneous precipitation method. Nanocrystalline Gd2O2S:Sm phosphors with two different concentrations of sulfur were prepared. In the first procedure, the weight of sulfur was five times more than Gd2O3 weight (was called sample Gd2O2S:Sm(1)) and in the second procedure, it was equal (was called sample Gd2O2S:Sm(2)). The nanocrystalline powders were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, radioluminescence and thermoluminescence. The XRD and FT-IR results confirmed that nanocrystalline Gd2O3:Sm, Gd2O2S:Sm and Gd2O2SO4:Sm powders had the cubic, hexagonal and orthorhombic structure in preparation temperatures of 620 °C and 900 °C. The SEM images showed that nanocrystalline Gd2O3:Sm, Gd2O2S:Sm and Gd2O2SO4:Sm powders had a semi-spherical shape with a uniform mean size of about 30 nm in diameter and confirmed the XRD results. The presence of all elements was confirmed in the synthesized samples using EDX spectroscopy. The results showed that the weight percent of sulfur during the preparation of Gd2O2S had an effect on the size, morphology and the luminescence intensity of nanocrystalline Gd2O2S powder. Under X-ray irradiation (40 kV and 40 mA), the emission spectra of nanocrystalline Gd2O3:Sm, Gd2O2S:Sm and Gd2O2SO4:Sm phosphors were studied. The results showed the orange-red emission peaks which were observed at 605 nm were the strongest emission peak for all nanocrystalline Gd2O3:Sm, Gd2O2S:Sm and Gd2O2SO4:Sm powders. This peak was corresponded to the 4G5/2-7H7/2 energy transition of Sm3+ ion. The TL response of Gd2O3:Sm, Gd2O2S:Sm and Gd2O2SO4:Sm after irradiation with different X-ray time exposure exhibited a peak shifting towards the lower temperatures. The glow curve deconvolution method was used to calculate trapping parameters and the obtained results were investigated in detail.

中文翻译：

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Sm掺杂Gd2O3、Gd2O2S和Gd2O2SO4纳米晶荧光粉的射电和热释光特性的合成与表征

摘要 本研究采用尿素均相沉淀法成功合成了纳米晶Gd2O3:Sm、Gd2O2S:Sm和Gd2O2SO4:Sm荧光粉。制备了具有两种不同硫浓度的纳米晶 Gd2O2S:Sm 荧光粉。在第一个程序中，硫的重量是 Gd2O3 重量的 5 倍（称为样品 Gd2O2S:Sm(1)），在第二个程序中，它相等（称为样品 Gd2O2S:Sm(2)）。通过X射线衍射、傅里叶变换红外光谱、扫描电子显微镜、能量色散X射线光谱、辐射发光和热释光对纳米晶粉末进行表征。XRD 和 FT-IR 结果证实纳米晶 Gd2O3:Sm、Gd2O2S:Sm 和 Gd2O2SO4:Sm 粉末具有立方、六方和斜方结构，制备温度分别为 620 °C 和 900 °C。SEM 图像显示纳米晶 Gd2O3:Sm、Gd2O2S:Sm 和 Gd2O2SO4:Sm 粉末呈半球形，平均直径约 30 nm，并证实了 XRD 结果。使用 EDX 光谱证实合成样品中所有元素的存在。结果表明，Gd2O2S制备过程中硫的重量百分比对纳米晶Gd2O2S粉末的尺寸、形貌和发光强度有影响。在 X 射线照射（40 kV 和 40 mA）下，研究了纳米晶 Gd2O3:Sm、Gd2O2S:Sm 和 Gd2O2SO4:Sm 荧光粉的发射光谱。结果表明，在 605 nm 处观察到的橙红色发射峰是所有纳米晶 Gd2O3:Sm 的最强发射峰，Gd2O2S:Sm 和 Gd2O2SO4:Sm 粉末。该峰对应于 Sm3+ 离子的 4G5/2-7H7/2 能量跃迁。Gd2O3:Sm、Gd2O2S:Sm 和 Gd2O2SO4:Sm 在不同 X 射线时间照射后的 TL 响应表现出向较低温度移动的峰值。使用辉光曲线解卷积方法计算捕获参数，并对所得结果进行了详细研究。