用柠檬酸螯合法制备Y2-x-yGdxEuyO3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Y2-x-yGdxEuyO3 晶格常数和晶胞体积, 分析了Gd与Eu在Y2O3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Y2-x-yGdxEuyO3粉体较为适合, 经900 ℃煅烧2 h可完全合成出立方相的Y2-x-yGdxEuyO3; 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Y0.2Gd1.65Eu0.15O3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.
Phase transformation during preparation of Y2−x−yGdxEuyO3 (x + y ≤2) nanoparticles by citric acid chelating and influence of pH value on the powder morphology were studied by FTIR, XRD and SEM. The behavior of solid solution was analyzed through calculation of lattice parameters and unit cell volume of Y2−x−yGdxEuyO3 and its luminescence property was obtained. The results show that the appropriate condition to prepare cubic Y2−x−yGdxEuyO3 powder is that the pH value less than 3, calcining at 900℃ for 2 h. Y2−x−yGdxEuyO3 powders with spherical morphology and size of 90 nm can be prepared under the condition of pH=1 and adding a little amount of glycol (5%, volume fraction). Luminescence properties of the powders are affected by the ratio of Y, Gd and the content of Eu. The luminous intensity reaches the maximum value when the powder composition is Y0.2Gd1.65Eu0.15O3. Concentration quenching occurs when y is above 0.15 and then the emission intensity decreases.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] |
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