共沉淀法制备Y_2O_2SO_4:Eu^(3+)荧光粉及其光致发光研究  

Co-precipitation fabrication and photoluminescence properties of Y_2O_2SO_4:Eu^(3+) phosphor

作　　者：连景宝[1] 桑晓彤 郭淑娟[1] 雷明霞[1] 

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《光电子．激光》2015年第3期511-518,共8页Journal of Optoelectronics·Laser

基　　金：辽宁省教育厅(L2014149)资助项目

摘　　要：采用商业Y(NO3)3·6H2O、Eu(NO3)3·6H2O、(NH4)2SO4和NaOH为实验原料,通过共沉淀法制备了Y2O2SO4:Eu3+荧光粉。利用热分析(DTA-TG-DTG)、傅里叶变换红外(FT-IR)光谱、X射线衍射(XRD)、扫描电子显微镜(SEM)和光致发光(PL)光谱等手段对合成的粉体进行了表征。结果表明,当(NH4)2SO4引入到反应体系中时,前驱体具有非晶态结构,且在空气气氛中800℃煅烧2h能转化为单相的Y2O2SO4粉体,该Y2O2SO4粉体呈准球形,粒径范围分布在0.5~1.0μm之间,团聚较严重。PL光谱分析表明,在270nm紫外光激发下,Y2O2SO4:Eu3+荧光粉呈红光发射,主发射峰位于620nm,归属于Eu3+的5D0→7F2跃迁。Eu3+的猝灭浓度是5 mol%,其对应的荧光寿命为1.22 ms。另外,当(NH4)2SO4未引入到反应体系中时,采用类似的方法合成了Y2O3:Eu3+荧光粉,并对Y2O2SO4:Eu3+和Y2O3:Eu3+荧光粉的PL性能进行了比较。Eu3＋activated yttrium oxysulfate（Y2O2SO4：Eu3＋）phosphor has been successfully synthesized by a co-precipitation method using commercially available Y（NO3）3·6H2O,Eu（NO3）3·6H2O,（NH4）2SO4and NaOH as the starting materials.The characteristics of the synthetic products are obtained by differential thermal analysis,thermogravimetry and derivative thermogravimetry（DTA-TGDTG）,Fourier transform infrared spectroscopy（FT-IR）,X-ray diffractometry（XRD）,scanning electron microscopy（SEM）,and photoluminescence（PL）spectroscopy.The results reveal that the as-synthesized precursor is amorphous structure when（NH4）2SO4is introduced in the reaction system.Moreover,the precursor could be transformed into pure Y2O2SO4 phase by calcining at 800 ℃for 2hin air.The as-synthesized Y2O2SO4 phosphor particles are quasi-spherical in shape,serious aggregation and about 0.5-1μm in size.PL spectra of the Y2O2SO4：Eu3＋phosphor under 270 nm ultraviolet（UV）light excitation show a red emission at 620 nm as the most prominent peak,which is attributed to the 5D0→7F2transition of Eu3＋ions in the Y2O2SO4 host.The quenching concentration of Eu3＋ions is 5%in molar ratio,and its corresponding fluorescence lifetime is 1.22 ms.Furthermore,the Y2O3：Eu3＋phosphor is also been synthesized by similar reaction when no（NH4）2SO4is added,and a comparison of PL properties between the Y2O2SO4：Eu3＋phosphor and the Y2O3：Eu3＋phosphor is also systematically discussed.

关 键 词：红色荧光粉 Y2O2SO4 共沉淀 氨水-(NH4)2SO4系统 光致发光(PL) 

分 类 号：TQ174[化学工程—陶瓷工业]