机械力固相化学反应法合成稀土磷酸盐绿色荧光粉

The Pareparation of Green-emitting Rare Earth Phosphate Phosphors by Mechancial Solid-phase Reaction

以CeCl3·7H2O,La(NO3)3·6H2O,Tb(NO3)3·6H2O,(NH4)2HPO4和适量表面活性剂为原料,采用机械力固相化学反应法制备磷酸盐绿色荧光粉,用XRD和TG DTA分析技术,研究球磨过程和煅烧过程中的物相变化,用扫描电镜和粒度分析对材料的形貌、粒径进行表征。用荧光光谱分析样品的发光性能。研究结果表明,随着球磨时间的增加,有助于产物的晶化,但其结晶程度较低,煅烧后则形成晶型完整的稀土正磷酸盐荧光粉,所得样品为亚微米级的球型绿色荧光粉,在272nm紫外线激发下发绿色荧光,发射主峰在548nm。

Sub micron (La,Ce,Tb)PO_4 green phosphors were prepared by mechancial solid-phase reaction of CeCl_3·7H_2O, La(NO_3)_3·6H_2O, Tb(NO_3)_3·6H_2O, (NH_4)_2HPO_4, and trace active surfacant. The phase evolution during milling and annealing process were examined by XRD and TG-DTA. The morphologies and grain size were measured by SEM and HS300 separately. Emission spectra of the phosphors was also measured. The results showed that the increase of milling time is beneficial to the crystallization of the product,but lower crystallization degree and the fine crystal of rare phosphatic phosphors can be obtained. The results of SEM photograph and particle size analysis showed that the product is sub micron (La,Ce,Tb)PO_4 green phosphors with spherical shape. Emission spectra of the phosphors showed that the fluorescence is green by activated by 272 nm ultraviolet, the main peak is at 548 nm.