GdVO_(4):Yb^(3+),Ho^(3+)和GdPO_(4):Yb^(3+),Ho^(3+)荧光粉的上转换发光特性研究

Upconversion luminescence properties of GdVO_(4):Yb^(3+),Ho^(3+)and GdPO_(4):Yb^(3+),Ho^(3+)phosphors

为了探究Yb^(3+),Ho^(3+)分别共掺杂在GdVO_(4)和GdPO_(4)两种基质材料的发光差异性,采用高温固相法制备GdVO_(4):Yb^(3+),Ho^(3+)和GdPO_(4):Yb^(3+),Ho^(3+)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,GdVO_(4):Yb^(3+),Ho^(3+)样品形状为不规则块状;GdPO_(4):Yb^(3+),Ho^(3+)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GdVO_(4):Yb^(3+),Ho^(3+)相比,GdPO_(4):Yb^(3+),Ho^(3+)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。

In order to investigate the luminescence difference between Yb^(3+),Ho^(3+)co-doped in GdVO_(4)and GdPO_(4)matrix materials,respectively,GdVO_(4):Yb^(3+),Ho^(3+)and GdPO_(4):Yb^(3+),Ho^(3+)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 GdVO_(4):Yb^(3+),Ho^(3+)samples are irregular lumps in shape,and the GdPO_(4):Yb^(3+),Ho^(3+)samples are rice-granular in shape.Under 980 nm excitation,green and red light emission was present in both samples.Compared with the GdVO_(4):Yb^(3+),Ho^(3+)doped with the same concentration,the red-green ratio of the GdPO_(4):Yb^(3+),Ho^(3+)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.