State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, PR China.
Inorg Chem. 2010 Dec 20;49(24):11499-504. doi: 10.1021/ic101608b. Epub 2010 Nov 24.
Gd(2)O(2)S:Ln(3+) (Ln = Eu, Tb) submicrospheres were successfully prepared through a facile and mild solvothermal method followed by a subsequent heat treatment. X-ray diffraction (XRD) results demonstrate that all the diffraction peaks of the samples can be well indexed to the pure hexagonal phase of Gd(2)O(2)S. The energy dispersive spectroscopy (EDS), element analysis, and FT-IR results show that the precursors are composed of the Gd, Eu, O, S, C, H, and N elements. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that these spheres are actually composed of randomly aggregated nanoparticles. The formation mechanism for the Gd(2)O(2)S:Ln(3+)(Ln = Eu, Tb) spheres has been proposed on an isotropic growth mechanism. Under ultraviolet excitation, Gd(2)O(2)S:Ln(3+)(Ln = Eu, Tb) spheres show red and green emission corresponding to the (5)D(0)→(7)F(2) transition of the Eu(3+) ions and the (5)D(4)→(7)F(5) transition of the Tb(3+) ions. Furthermore, this synthetic route may have potential applications for fabricating other lanthanide oxysulfides.
Gd(2)O(2)S:Ln(3+)（Ln = Eu、Tb）亚微米球通过简便温和的溶剂热法随后进行后续热处理成功制备。X 射线衍射（XRD）结果表明，所有样品的衍射峰都可以很好地被归属于纯六方相 Gd(2)O(2)S。能谱（EDS）、元素分析和傅里叶变换红外光谱（FT-IR）结果表明，前驱体由 Gd、Eu、O、S、C、H 和 N 元素组成。扫描电子显微镜（SEM）和透射电子显微镜（TEM）结果表明，这些球体实际上是由随机聚集的纳米粒子组成的。提出了 Gd(2)O(2)S:Ln(3+)(Ln = Eu、Tb)球体的形成机制是各向同性生长机制。在紫外光激发下，Gd(2)O(2)S:Ln(3+)(Ln = Eu、Tb)球体表现出与 Eu(3+)离子的（5）D(0)→(7)F(2)跃迁和 Tb(3+)离子的（5）D(4)→(7)F(5)跃迁相对应的红色和绿色发射。此外，这种合成路线可能具有用于制备其他镧系氧硫化物的潜在应用。
