International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Inorg Chem. 2010 Mar 15;49(6):2960-8. doi: 10.1021/ic902484v.
The synthesis of a series of new layered rare-earth hydroxide solid solutions and their transformation into (Eu(x)Gd(1-x))(2)O(3) crystallites are described. Highly crystalline platelets of Eu(x)Gd(1-x)(OH)(2.5)Cl(0.5) x 0.9 H(2)O solid solutions with various Eu(3+)/Gd(3+) ratios were prepared through a homogeneous precipitation method. The hydroxide solid-solution samples exhibited characteristic Eu(3+) photoluminescence properties through the energy transfer from Gd(3+) to Eu(3+) and the self-excitation of Eu(3+). Cubic (Eu(x)Gd(1-x))(2)O(3) crystallites were obtained via quasi-topotactic transformation of Eu(x)Gd(1-x)(OH)(2.5)Cl(0.5) x 0.9 H(2)O solid solutions above 800 degrees C. The as-transformed cubic (Eu(x)Gd(1-x))(2)O(3) crystallites well retained the original platelet morphology and single crystalline nature, and exhibited greatly enhanced photoluminescence properties with respect to the precursor hydroxides. The Eu(3+) content of 0.05 in the cubic (Eu(x)Gd(1-x))(2)O(3) gave a maximum luminescence intensity, which is comparable with that of a commercial Y(2)O(3):Eu phosphor.
描述了一系列新型层状稀土氢氧化物固溶体的合成及其转化为(Eu(x)Gd(1-x))(2)O(3) 晶相的过程。通过均相沉淀法制备了具有各种 Eu(3+)/Gd(3+) 比的高度结晶的 Eu(x)Gd(1-x)(OH)(2.5)Cl(0.5) x 0.9 H(2)O 氢氧化物固溶体的类质同晶层状薄片。氢氧化物固溶体样品通过 Gd(3+)到 Eu(3+)的能量转移和 Eu(3+)的自激发表现出特征的 Eu(3+)光致发光特性。通过在 800 摄氏度以上对 Eu(x)Gd(1-x)(OH)(2.5)Cl(0.5) x 0.9 H(2)O 固溶体进行准拓扑转化，可以得到立方(Eu(x)Gd(1-x))(2)O(3)晶相。转化得到的立方(Eu(x)Gd(1-x))(2)O(3)晶相很好地保持了原始薄片形貌和单晶特性，并且相对于前体氢氧化物表现出大大增强的光致发光性能。在立方(Eu(x)Gd(1-x))(2)O(3)中，Eu(3+)的含量为 0.05 时发光强度最大，与商用 Y(2)O(3):Eu 荧光粉相当。
