State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China.
Dalton Trans. 2013 Jun 14;42(22):8041-8. doi: 10.1039/c3dt50141h. Epub 2013 Apr 9.
Rare-earth niobate and tantalate materials are of considerable interest for use as phosphors, photocatalysts and ionic conductors. We successfully synthesized Ln3MO7 (Ln = Y, Ce, Er, Ho, Tm, Yb and Lu, M = Ta, Nb) nanophosphors by a hydrothermal method using the water-soluble Lindqvist ion polyoxometalates HNb6O19 and Ta6O19 as Nb and Ta sources. The Pawley refinements of these nanophosphors revealed that the Lu3TaO7 and Lu3NbO7 nanophosphors could be indexed in the cubic system with the space group Fm3m, and that Y3TaO7 crystallizes in orthorhombic symmetry with the space group of C2221. These three solid compounds are nanoparticles with average particle sizes of 7.5, 5.9 and 4.0 nm for Lu3TaO7, Lu3NbO7 and Y3TaO7, respectively. The photoluminescence properties of Eu(3+) doped Lu3TaO7, Lu3NbO7 and Y3TaO7 were studied, and Eu(3+)/Sr(2+) co-doped Ln3MO7 (M = Ta, Nb) has an enhanced emission intensity compared to that of Ln3MO7:Eu(3+) (M = Ta, Nb).
稀土铌酸盐和钽酸盐材料作为荧光粉、光催化剂和离子导体具有相当大的应用潜力。我们成功地通过水热法，使用水溶性 Lindqvist 离子多金属氧酸盐HNb6O19和Ta6O19作为 Nb 和 Ta 源，合成了 Ln3MO7（Ln = Y、Ce、Er、Ho、Tm、Yb 和 Lu，M = Ta、Nb）纳米荧光粉。这些纳米荧光粉的 Pawley 精修表明，Lu3TaO7 和 Lu3NbO7 纳米荧光粉可以用立方晶系 Fm3m 空间群进行指标化，Y3TaO7 以正交对称晶系 C2221 空间群结晶。这三种固体化合物是平均粒径分别为 7.5nm、5.9nm 和 4.0nm 的纳米颗粒，分别为 Lu3TaO7、Lu3NbO7 和 Y3TaO7。研究了 Eu(3+)掺杂 Lu3TaO7、Lu3NbO7 和 Y3TaO7 的光致发光性能，与 Eu(3+)/Sr(2+)共掺杂的 Ln3MO7（M = Ta、Nb）相比，Ln3MO7:Eu(3+)（M = Ta、Nb）的发射强度增强。
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