摘要
利用水热法合成了磷酸钇基质(YPO4)和磷酸钇掺铕(YPO4∶Eu)的纳米颗粒。通过粉末衍射(XRD)、透射电镜(TEM)、红外光谱、拉曼光谱、荧光光谱、热重分析(TG)等手段对合成纳米材料的结构、粒度、表面水的含量以及发光特性进行了表征。结果表明:样品结晶良好,为单一的四方相(I41/AMD)锆石结构,且随着水热温度的降低,晶粒的粒度变小。研究发现,随着YPO4样品粒度的减小,晶格体积膨胀,并通过XRD结合红外和拉曼分析发现晶体对称性提高。利用表面水的偶极模型分析了其内在机制。给出了YPO4∶Eu的荧光光谱,指出其中各个峰对应的跃迁能级,确定为Eu3+的发射峰。
YPO4 and Eu-doped YPO4 nanoparticles were synthesized by a hydrothermal method. The structure, content of surface water and luminescence properties were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, fluorescence spectrum, infrared spectroscopy, Raman spectroscopy and thermogravimetry analysis. The XRD measurements indicated that YPO4 nanoparticles were a single phase of tetragonal （I41/AMD） zircon structure type. YPO4 nanoparticles showed a size reduction with the reaction temperature decreased. Considering the XRD, IR and Raman analysis, a lattice expansion and enhancement of structural units were observed with the particle size decreased. A dipole to dipole model was used to analysis the intrinsic reason. The fluorescence spectra of Eu-doped YPO4 was also given and the emission bands were ascribed to the f to f transitions of Eu^3 ＋ .
出处
《中国稀土学报》
CAS
CSCD
北大核心
2007年第6期656-661,共6页
Journal of the Chinese Society of Rare Earths
关键词
水热法
晶格膨胀
蓝移
稀土
hydrothermal method
lattice expansion
blue shift
rare earths
