论文部分内容阅读
用均相共沉淀法将铈离子(Ce~(3+))、钐离子(Sm~(3+))共掺杂钒酸钇(YVO_4)制得(Sm_(0.01)Y_(0.99-x))VO_4∶Ce_x~(3+)荧光粉。采用X-射线衍射仪(XRD)、扫描电镜(SEM)、荧光光谱仪(PL)对制得荧光粉的晶体结构、颗粒形貌以及发光特性进行了分析。结果表明,Ce~(3+)、Sm~(3+)掺入YVO_4荧光粉的相结构仍为四方锆型结构,随着Ce~(3+)离子掺杂浓度的增大,XRD的衍射峰更加明显,SEM显示Ce~(3+)离子掺杂浓度的增大,荧光粉颗粒团聚更加严重,颗粒尺寸约80nm。荧光粉的激发峰在460nm,与蓝光LED的发射峰吻合,发射峰在580nm左右,属于橙光,且随着Ce~(3+)浓度的增加,荧光变强,有利于提高LED的显色指数。
(Sm_ (0.01) Y_ (0.99-x)) was prepared by co-doping yttrium vanadate (YVO_4) with cerium ions (Ce 3+) and samarium ions (Sm 3+) ) VO_4: Ce_x ~ (3+) phosphor. The crystal structure, particle morphology and luminescent properties of the prepared phosphor were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectroscopy (PL). The results show that the phase structure of Ce ~ (3 +) and Sm ~ (3+) doped YVO_4 phosphor is still tetragonal zirconium structure. With the increase of Ce ~ (3 +) doping concentration, the diffraction of XRD The peak is more obvious. The SEM shows that the doping concentration of Ce ~ (3+) ions increases and the agglomeration of the phosphor particles becomes more serious. The particle size is about 80 nm. The excitation peak of the phosphor is at 460nm, which is consistent with the emission peak of the blue LED. The emission peak is about 580nm, which belongs to orange light. With the increase of Ce ~ (3 +) concentration, the fluorescence becomes stronger, index.