采用高温固相法合成了Sr3Al2O6∶Eu2+, Dy3+长余辉发光材料。 用X射线衍射仪及荧光分光光度计对材料物相及光谱性能进行了分析。 结果表明: 所得样品为Sr3Al2O6的纯相, 在360 nm波长的激发下, 得到波峰为537 nm的宽带发射光谱； 在468 nm波长的激发下, 得到波峰为590 nm的宽带发射光谱； 在波长为394 nm的激发下, 537和590 nm的峰同时出现。 根据晶格场效应和电子云膨胀效应, 对不同激发波长对Sr3Al2O6∶Eu2+, Dy3+发射光谱的影响进行了解释。 结果表明: 在Sr3Al2O6∶Eu2+, Dy3+中发光中心因其5d能级劈裂幅度不同及4f65d1能带重心不同而导致发光颜色的不同。

The Eu2+ and Dy3+ ion co-doped Sr3Al2O6 phosphor powders with long afterglow were prepared with high temperature solid-state reaction. The phase and the spectra properties of the material were characterized by X-ray diffraction (XRD) and fluorescence spectrophotometer. It was found that the sample is composed of pure Sr3Al2O6 phase. Furthermore, the emission peak of 537 nm under 360 nm excitation and that of 590 nm excited by 468 nm-light were obtained, respectively, and it is more interesting that the emission peaks were at 537 and 590 nm under 394 nm excitation. The effects of different excitation wavelengths on the emission spectrum were explained reasonably by the effect of nephelauxetic effect and crystal field. It revealed that the two types of luminescence with different color were caused by the differences of the center of gravity of the 5d excited state energy level and the split range of 5d energy level.