采用高温固相法制备不同浓度Tb元素掺杂的硅铝酸盐荧光材料。 当烧结温度为1 350 ℃时其荧光强度达到最大值。 通过X射线衍射图谱可知体系中基质材料为CaAl2Si2O8, Tb元素以Ca2Tb8(SiO4)6O2相存在。 通过拉曼光谱分析可知, 870 cm-1处振动峰与Ca2Tb8(SiO4)6O2中Tb与硅氧四面体的伸缩振动相关; Tb原子与硅氧四面体之间的弯曲振动产生408 cm-1振动峰。 随着Tb掺杂量的增加, 拉曼振动峰强度, 荧光分光光度计测得的荧光光谱以及拉曼光谱仪测得的光致发光光谱的峰强均呈现先增后减的变化规律。 该体系中Tb元素与硅氧四面体匹配数量逐渐增加, 当Tb掺杂量超过一定极限值时, 体系内发生浓度猝灭, 导致荧光性能下降。 采用325 nm激光作为激发光源, 用拉曼光谱仪的光致发光测量模式产生的峰形与传统荧光分光光度计的光谱曲线一致, 但其光谱分辨率明显高于传统荧光分光光度计获得的光谱, 有助于对细微能级跃迁现象加以区分。

CaAl2Si2O8∶xTb was prepared by the high temperature solid state reaction method. The fluorescence intensity is the strongest when the sintering temperature is 1 350 ℃. The X-ray diffraction patterns show that the base material in the system is CaAl2Si2O8, and the Tb element exists in Ca2Tb8(SiO4)6O2 phase. Raman spectrum shows that the vibration peak at 870 cm-1 is related to the stretching vibration between Tb atom and silicon tetrahedron in Ca2Tb8(SiO4)6O2, and the bending vibration between Tb atom and silicon tetrahedron produces 408 cm-1 vibration peak. With the increase of Tb doping content, the intensity of Raman vibration peak, the intensity of fluorescence spectrum measured by fluorescence spectrophotometer and Raman spectrophotometer increased first and then decreased. The amount of Tb matching with silicon-oxygen tetrahedron in the system increases gradually. When Tb doping exceeds a certain limit, concentration quenching occurs in the system, resulting in a decrease in fluorescence performance. Using 325 nm laser as excitation source, the fluorescence peak shape produced by Raman spectrometer Photoluminescence spectrum mode is consistent with the spectrum curve of traditional fluorescence spectrophotometer, but its spectral resolution is obviously stronger than that obtained by traditional fluorescence spectrophotometer, which is helpful to distinguish fine level transition phenomena.