纯相CaAl_4O_7:Tb^(3+)(Sm^(3+))的自蔓延燃烧合成及光致发光特性

Self-propagating Combustion Synthesis and Photoluminescent Properties of Pure Phase CaAl_4O_7:Tb^(3+)(Sm^(3+))

用自蔓延燃烧合成(SPCS)技术制备CaAl_4O_7∶Tb^(3+)和CaAl4O7∶Sm^(3+)两种荧光材料,并通过X射线衍射(XRD)、Fourier变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、紫外-可见漫反射谱(UV-Vis DRS)等方法考察两种荧光材料的结构、形貌及光吸收性质.结果表明:SPCS技术可显著降低合成温度;样品的结晶度较好,Tb^(3+)和Sm^(3+)掺杂后,未改变CaAl_4O_7的单斜晶系结构与空间群特征,但使晶格轻微畸变且使其吸收主峰和吸收带边红移;CaAl_4O_7∶Tb^(3+)和CaAl_4O_7∶Sm^(3+)分别发射特征绿光和粉红光,其激发光谱和发射光谱均呈较精细的结构特征.

CaAl4O7∶Tb^3+ and CaAl4O7∶Sm^3+ fluorescent materials were prepared by the self-propagating combustion synthesis(SPCS)technology.The structure,morphology and light absorption property of the two fluorescent materials were investigated by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM),and ultraviolet-visible diffuse-reflectance spectrum(UV-Vis DRS),etc.The results show that SPCS technology can significantly reduce the synthesis temperature,crystallinity of samples is good,and the doping of Tb^3+ and Sm^3+ does not change monoclinic system structure and space group characteristics of CaAl4O7,but it results in the slight lattice distortion and the redshift of absorption peak and absorption band edge.The CaAl4O7∶Tb^3+ and CaAl4O7∶Sm^3+ emit green and pink light,respectively,and their excitation spectra and emission spectra show fine structural characteristics.