【摘要】 采用燃烧法,以稀土硝酸盐和二硫代乙二酰胺为反应物,在点燃温度为300-350℃时,制备了Gd2O2S:Tb3+X-射线纳米荧光粉。分别以X-射线衍射(XRD)、扫描电子显微镜(SEM)、光致发光(PL)光谱及X-射线激发的发光(XEL)光谱对样品进行了表征。XRD分析表明,当焙烧温度小于500℃时,可得到单一相的Gd2O2S:Tb3+X-射线纳米荧光粉;当温度为700℃时,样品完全转变为Gd2O2SO4相。SEM照片给出荧光粉具有疏松和多孔的块状及连续的三维的网络结构。PL和XEL光谱均呈现出激活剂Tb3+离子的较强的特征发射,但它们的峰位略有差别。此外,本实验Tb3+离子的最佳掺杂浓度是0.35mol%。更多还原

【Abstract】 Gd₂O₂S:Tb³⁺ X-ray nanometer phosphors were prepared by combustion reaction from mixed rare earth nitrate reactants and dithiooxamide at ignition temperatures of 300-350℃. The samples were characterized by X-ray diffraction （XRD）, Scanning electronic microscope （SEM）, photoluminescence （PL） and X-ray excited luminescence （XEL） spectra. XRD results revealed the pure oxy-sulfide Gd₂O₂S phases when the sintering temperatures were no more than 500℃, and while the temperatures added up to 700℃, the samples totally transformed from Gd₂O₂S phases into Gd₂O₂SO₄ phases. SEM micrographs illustrated a loose, porous agglomeration and a continuous three-dimensional network structure. PL spectra and XEL spectra both showed the same characteristic emission of Tb³⁺ ions, however, their peak positions were slightly different each other. In addition, 0.35mol% was the most appropriate concentration doped of Tb³⁺ ions for the luminescence in this work.更多还原