采用高温固相法合成了Tb3+,Yb3+共掺杂的Sr2B2O5荧光粉.通过X射线衍射(XRD)和荧光光谱(PL)对样品的物相结构和发光性质进行了表征.XRD结果表明,合成样品为单斜结构的Sr2B2O5相.分别使用543 nm和980 nm的监测波长,得到的激发光谱均在354 nm、374 nm处有较强的激发峰,其中374 nm处最强,说明Sr2B2O5荧光材料在近紫外光区对太阳光有很强的吸收;在374 nm(Tb3+:7F6→SD3)紫外光激发下,观察到Tb3+:5D4→7FJ(J=6,5,4,3)可见光区发射光,并检测到Yb3+∶ 2F5/2→2F7/2的近红外发射光.通过研究激发光谱和发射光谱与Yb3+掺杂浓度的关系,发现在单斜晶体Sr2B2O5中,Yb3+具有很高的猝灭浓度.
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