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用柠檬酸螯合法制备Y_(2-x-y)Gd_xEu_yO_3纳米粉体(x+y≤2),通过FTIR,XRD和SEM分析了制备过程中的物相变化以及pH值对粉体形貌的影响.测试了Y_(2-x-y)Gd_xEu_yO_3晶格常数和晶胞体积,分析了Gd与Eu在Y_2O_3中的固溶行为及其发光性能.结果表明:在pH<3的体系中制备Y_(2-x-y)Gd_xEu_yO_3粉体较为适合,经900℃煅烧2 h可完全合成出立方相的Y_(2-x-y)Gd_xEu_yO_3;在pH=1时,加入少量乙二醇(5%,体积分数)时得到粉体形貌最佳,粒径约90 nm,近球形.样品的发光性能和Y,Gd的配比以及Eu的含量有关,当化学配比为Y_(0.2)Gd_(1.65)Eu_(0.15)O_3时样品发光强度最高,y值超过0.15会发生浓度猝灭,导致发光强度降低.
The Y_ (2-xy) Gd_xEu_yO_3 nanopowders (x + y≤2) were prepared by citric acid chelate method. The phase changes and the influence of pH value on the morphology of the powders were analyzed by FTIR, XRD and SEM. The lattice constants and unit cell volume of Y_ (2-xy) Gd_xEu_yO_3 were tested, and the solid solution behavior and luminescent properties of Gd and Eu in Y_2O_3 were analyzed. The results show that Y_ (2-xy) ) Gd_xEu_yO_3 powder is more suitable for calcination at 900 ℃ for 2 h to synthesize Y_ (2-xy) Gd_xEu_yO_3 of cubic phase. When pH = 1, a small amount of ethylene glycol (5%, volume fraction) The morphology is the best, and the particle size is about 90 nm, nearly spherical.The luminescence properties of the samples are related to the ratio of Y and Gd and the content of Eu. When the chemical ratio is Y_ (0.2) Gd_ (1.65) Eu_ (0.15) O_3 The luminescence intensity of the sample is the highest, the concentration quenching occurs when the value of y exceeds 0.15, resulting in the decrease of luminescence intensity.