为了探究Yb3+,Ho3+分别共掺杂在GdVO4 和GdPO4 两种基质材料的发光差异性,采用高温固相法制备GdVO4:Yb3+,Ho3+和GdPO4:Yb3+,Ho3+上转换发光材料.并采用X射线衍射仪(X-ray diffraction,XRD)、拉曼光谱(Raman spectroscopy,Raman)、扫描电子显微镜(scanning electron microscopy,SEM)和荧光光谱对材料的结构、组成、形貌和上转换发光性能进行测试分析.结果表明,合成样品均是纯相,GdVO4:Yb3+,Ho3+样品形状为不规则块状;GdPO4:Yb3+,Ho3+样品为米粒状.在 980 nm激发下,两种样品都存在绿光和红光发射.与掺杂相同浓度的GdVO4:Yb3+,Ho3+相比,GdPO4:Yb3+,Ho3+样品的红绿比较大,色度坐标更接近红光,在生物成像领域具有更大的应用潜力.
Upconversion luminescence properties of GdVO4:Yb3+,Ho3+and GdPO4:Yb3+,Ho3+phosphors
In order to investigate the luminescence difference between Yb3+,Ho3+co-doped in GdVO4 and GdPO4 matrix materials,respectively,GdVO4:Yb3+,Ho3+and GdPO4:Yb3+,Ho3+upconverted luminescent materials were prepared by high-temperature solid-phase method.The structure,composition,morphology and upconversion luminescence properties of the materials were tested and analysed by X-ray diffraction(XRD),Raman spectroscopy(Raman),scanning electron microscopy(SEM)and fluorescence spectroscopy.The results show that the synthesised samples are all pure phases,the GdVO4:Yb3+,Ho3+samples are irregular lumps in shape,and the GdPO4:Yb3+,Ho3+samples are rice-granular in shape.Under 980 nm excitation,green and red light emission was present in both samples.Compared with the GdVO4:Yb3+,Ho3+doped with the same concentration,the red-green ratio of the GdPO4:Yb3+,Ho3+sample is larger,and the colour coordinates are closer to those of red light,which has a greater potential for application in the field of bioimaging.
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