Gd_2O_2SO_4∶Dy^(3+)纳米粉体的共沉淀法合成及光致发光研究  

Synthesis and photoluminescence of Gd_2O_2SO_4∶Dy^(3+) nano-phosphors by a co-precipitation method

作　　者：连景宝[1] 王秉新[1] 李晓东[2] 孙旭东[2] 

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [2]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004

出　　处：《功能材料》2010年第12期2091-2093,2097,共4页Journal of Functional Materials

基　　金：国家杰出青年科学基金资助项目(50425413)

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。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.

关 键 词：Gd2O2SO4 纳米粉体 共沉淀 光致发光 

分 类 号：TQ174[化学工程—陶瓷工业]