合成了3种不同Eu掺杂量的Sr4Al4O25:Eu2+,Dy3+发光粉体,发现当Eu掺杂量低于0.012 mol时,发射光谱中存在2个主发射峰,分别位于407 nm和494 nm.随着Eu掺杂浓度增加,407 nm发射峰逐渐消失,而494 nm主发射峰增强.结合Sr4Al14O25晶体结构和激发-发射光谱,建立了2种Eu发光中心之间的能量传递模型,对实验现象进行了合理的解释.余辉衰减曲线测试结果表明,3种磷光体试样均具有长余辉性能,尤其Sr3.95Al14O25:Eu0.012,Dy0.024试样,其余辉时间在人眼可视亮度水平可持续20 h以上.
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