SrZn(WO_4)_2∶Tb^(3+),Ce^(3+)绿色荧光粉的制备及发光性能研究  

Synthesis and Fluorescence Properties of SrZn(WO_4)_2 ∶Tb^(3+),Ce^(3+) Phosphors

作　　者：武文[1,2] 尹江龙[1] 宣亚文[1] 张新磊[2] 刘春霞[1] 王振领[2] 

机构地区：[1]周口师范学院化学系,河南周口466001 [2]周口师范学院稀土功能材料及应用重点实验室,河南周口466001

出　　处：《光谱学与光谱分析》2014年第1期43-46,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(21171179);河南省科技计划项目(132102310296;132102210193);河南省教育厅科学技术研究重点项目(13A150103;12A150029);周口师范学院实验室开放项目(K201319);应用化学重点学科项目资助

摘　　要：通过化学共沉淀法制备了适合近紫外激发的SrZn1-x(WO4)2∶xTb3+∶yCe3+系列绿色荧光粉。利用X射线衍射(XRD)分析了不同掺杂比例对样品物相的影响。采用荧光光谱(PL)对样品的激发光谱和发射光谱进行了表征。分别讨论了稀土Tb3+单掺及Ce3+和Tb3+共掺对样品发光性能的影响。XRD分析表明:样品的主衍射峰与标准卡片(JCPDS 08-0490和JCPDS 15-0774)的衍射峰基本一致,说明单掺和共掺稀土离子均未改变基质晶格结构。在样品的激发光谱中,223nm为主激发峰,属于Tb3+的7F—7 D自旋允许跃迁。在223nm的紫外光激发下,样品发射光谱主发射峰位置在543nm,归属于Tb3+的5 D4→7 F5跃迁。当Ce3+和Tb3+共掺时,峰型和位置变化不大,Ce3+和Tb3+掺杂摩尔分数比为0.02∶0.06时,发光强度得到很大提高,说明Ce3+和Tb3+之间存在着能量传递。SrZn1-x （WO4）2 ： xTb3＋, yCe3＋ green fluorescent phosphors for near ultraviolet excitation were prepared using chemical co-precipitation, The phases of different doping ratio samples were characterized by the X-ray diffraction （XRD）. The emission spectrum and excitation spectrum of samples were characterized by fluorescence spectroscopy （PL）. The luminescence properties of the rare-earth Tb3＋ ion doped and Ce3＋ and Tb3＋ ion codoped samples were discussed. XRD analysis shows that the main diffraction peaks of samples were consistent with the standard card （JCPDS 08-0490 and the JCPDS 15-0774） of the diffrac- tion peak data. This showed that the doping rare earth ions did not change matrix lattice structure. The excitation spectrum showed that the excitation spectrum peaks at 223 nm which is assigned to the 7F-7D absorption transitions of Tb3＋. The emis- sion spectrum excited by 223 nm exhibits sharp lines peaking at 543 nm which was assigned to the 5D4→7F5 transitions of the Tb3＋ ions. With Tb3＋ and Ce3＋ co-doping, the spectrum didn＇t change much. The intensity of fluorescence reached the stron- gest when the concentration of Tb3＋ ： Ce3＋ arrived at 0. 06 ： 0. 02 which may means that there was energy transfer between the ions of Ce3＋ and Tb3＋.

关 键 词：沉淀法 共掺杂 光致发光 

分 类 号：O482.3[理学—固体物理]