Tb^(3+)掺杂CePO_4花状团簇的控制合成及发光性能

Hydrothermal Synthesis and Luminescence Properties of CePO_4∶Tb Flower-Like Clusters

在无模板条件下,通过调节Tb3+的浓度水热法控制合成了CePO4∶Tb花状团簇。花状团簇由直径为80～90nm、长度约为1μm的纳米线组成。利用X射线衍射(XRD)、场发射扫描电镜(FE-SEM)和荧光光谱分析了产物的相结构、晶粒尺寸、形貌及发光性能。当Ce3+/Tb3+摩尔比为0.850∶0.150时,Tb3+在过量的磷酸体系中诱导纳米线组装生长成花状团簇。发现反应物Ce3+/Tb3+摩尔比和磷酸浓度影响产物形貌的控制合成。并推测了花状团簇的生长机制。产物CePO4∶Tb的荧光性质测试表明,当Ce3+/Tb3+摩尔比为0.850∶0.150时,所合成的花状团簇的发射强度达到最大值,Tb3+的掺入量继续增加其发光强度迅速降低。

Tb3＋-doped CePO4 flower-like clusters were hydrothermally synthesized without using any template or surfactant by varying the reactant Tb3＋ cation concentration.It was observed that the flower-like clusters were composed by nanowires with a diameter of about 80~90 nm and lengths up to 1 μm.The structures,morphologies,sizes and luminescence properties of the products were studied by X-ray powder diffraction（XRD）,field-emission scanning electronic microscopy（FE-SEM）,and luminescence spectra.With the reactant Ce3＋/Tb3＋ molar ratio of 0.850∶0.150,the uniform flower-like clusters were actually composed of a self-assembly of the oriented nanowires through an Tb3＋-induced in the excessive PO3-4.It was found that the reactant Ce3＋/Tb3＋ molar ratio and phosphoric acid played key roles in the morphology control of the product.A possible formation mechanism for the flower-like morphology was also proposed.The luminescence properties of CePO4∶Tb flower-like cluster were performed,indicating that the strongest emission intensity was reached with 0.850∶0.150 molar ratios of Ce3＋/Tb3＋.