采用高温固相反应按化学式Sr4-xBaxAl14O25:Eu2+,Dy3+(x=0,0.8,1.6,2.4,3.2,4)配比原料,合成长余辉发光材料.X射线衍射分析表明,当x=0.8时,产物物相为单斜结构SrAl2O+和磁铅矿结构SrAl12O19共存;当x>1.6时,产物主相转变为BaAl2O+六角结构.对所得样品采用360nm光照,发射光谱表明,样品发光是以Eu2+为发光中心,由Eu2+电子4f65d-4f7跃迁所致,并且随着Ba掺入量的增加,样品发射光谱峰位产生移动,这是由于Sr2+取代产物中Ba2+位置后,导致晶格收缩,影响Eu2+的5d能级劈裂,从而影响电子4f65d-4f7跃迁.余辉光谱显示x>1.6时,产物的余辉发光是以BaAl2O+基质中Eu2+为发光中心.余辉衰减检测和热释光谱分析发现不同掺Ba量的样品余辉衰减快慢不同,是由于其中存在的陷阱能级深度不同,且陷阱能级越深,其余辉时间越长.
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