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中文摘要：
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。
英文摘要：
Gd2O2SO4∶Dy3＋ nano-phosphors were synthesized by a co-precipitation method from Gd2O3,Dy2O3,H2SO4 and NaOH starting materials.The characterizations of Gd2O2SO4∶Dy3＋ nano-phosphors were investigated by means of XRD,TEM and PL spectra.XRD analysis shows that the precursor can be transformed into pure Gd2O2SO4∶Dy3＋ nano-phosphor by calcining at 900℃ for 2h in air.TEM observation shows that the Gd2O2SO4∶Dy3＋ phosphor particles are quasi-spherical in shape and well dispersed,with a mean particle size of about 20-40nm.Photoluminescence（PL）spectroscopy reveals that the main and second emission peaks are located at 575 and 485nm under 277nm UV light excitation,which corresponds to the 4F9/2→6H13/2 and the 4F9/2→6H15/2 transitions of Dy3＋ ions,respectively.The quenching concentration of Dy3＋ ions is 2mol% and the concentration quenching mechanism is exchange interaction among the Dy3＋ ions.Decay study reveals that the 4F9/2→6H13/2 and 4F9/2→6H15/2 transitions of Dy3＋ ions have a single exponential decay behavior with a corresponding lifetime of 0.468 and 0.462ms,respectively.
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