采用Gd2O3、Dy2O3、H2SO4和NaOH为实验原料,通过共沉淀法合成了Gd2O2SO4:Dy3+纳米粉体.利用X射线衍射(XRD)、透射电子显微镜(TEM)和光致发光(PL)光谱等手段对合成的粉体进行了表征.XRD分析表明前躯体在空气气氛下900℃煅烧2h能转化成纯相的Gd2O2SO4:Dy3+.TEM观察显示Gd2O2SO4:Dy3+粉体形貌为近球形,分散性良好,粒度大小为20～40nm.PL光谱分析表明在277nm紫外光激发下,Gd2O2SO4:Dy3+的主次发射峰分别位于575nm(黄光)和485nm(蓝光),分别归属于Dy3+的4F9/2→6H13/2和4F9/2→6H15/2跃迁.Dy3+的猝灭浓度是2%(摩尔分数),猝灭机理是由于Dy3+和Dy3+之间的交换相互作用.余辉光谱研究表明Dy3+的4F9/2→6H13/2和4F9/2→6H15/2跃迁均具有e单指数衰减行为,荧光寿命分别为0.468和0.462ms.
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