纯相CaAl4O7∶Tb3+(Sm3+)的自蔓延燃烧合成及光致发光特性#br#

用自蔓延燃烧合成(SPCS)技术制备CaAl₄O₇∶Tb³⁺和CaAl₄O₇∶Sm³⁺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, Tb³⁺和Sm³⁺掺杂后, 未改变CaAl₄O₇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； CaAl₄O₇∶Tb³⁺和CaAl₄O₇∶Sm³⁺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.

Self propagating Combustion Synthesis and PhotoluminescentProperties of Pure Phase CaAl4O7∶Tb3+(Sm3+)#br#

CaAl₄O₇∶Tb³⁺ and CaAl₄O₇∶Sm³⁺ fluorescent materials were prepared by the self propagating combustion synthesis ( SPCS) technology. The structure, morphology and light absorption property of thetwo 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 Tb³⁺ and Sm³⁺ 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∶Tb³⁺ and CaAl₄O₇∶Sm³⁺ emit green and pink light, respectively, and their excitation spectra and emission spectra show fine structural characteristics.