共沉淀-热处理工艺合成(La,Ce,Tb)PO_4荧光粉的研究  

(La,Ce,Tb)PO_4 Phosphor Prepared by Co-Precipitation Method with Heat Treatment Process

作　　者：冯宗玉[1] 黄小卫[1] 王猛[1] 龙志奇[1] 侯永可[1] 彭新林[1] 

机构地区：[1]北京有色金属研究总院稀土材料国家工程研究中心,有研稀土新材料股份有限公司,北京100088

出　　处：《稀有金属材料与工程》2013年第S2期375-378,共4页Rare Metal Materials and Engineering

基　　金：国家"863"计划重大项目(2010AA03A405);国家自然基金重点项目(50934004);国家科技支撑计划(2012BAE01B02)

摘　　要：通过共沉淀法结合热处理工艺制备了(La,Ce,Tb)PO4绿色荧光粉。采用差热分析(DTA)、扫描电镜(SEM)、X射线衍射(XRD)和荧光光谱(PL)等分析手段,对热处理过程中荧光粉的微观形貌变化、晶体结构及其发光性能进行了研究。结果表明:随着温度的升高,荧光粉颗粒粘连团聚现象严重,形貌较差;通过预处理、添加分散剂等改进热处理工艺,可以获得类球形、分散性较好的LAP绿色荧光粉。将前驱体在1200℃热处理3 h,产物转变为单相性良好的LAP晶体。改进热处理工艺后未改变LAP荧光粉的纯相结构,同时荧光粉的发光强度比同类商业粉高出9%以上。(La,Ce,Tb)PO4 green-emitting phosphor was prepared by co-precipitation method and followed by heat treatment process.The particle morphology,crystal structure and photoluminescence properties of LAP phosphor during the heat treatment process were investigated by XRD,SEM,XRD and PL spectra techniques.The results show that the phosphor particles have serious conglutination and aggregation phenomenon with the calcinations temperature rising up.Therefore,the morphology of phosphor becomes irregular.The LAP phosphor with spherical-like shape and narrow grain size distribution was synthesized through improved heat treatment process including pre-burning process and adding dispersion agent.It is observed that the precursors calcined at 1200 ℃ for 3 h transform into LAP phase completely.Moreover,the phase purity of LAP phosphor dose not change with improved heat treatment process.Finally,the photoluminescence intensity of the LAP phosphor doped with the dispersion agent is 9% higher than the corresponding commercial phosphor.

关 键 词：共沉淀 荧光粉 分散剂 形貌 热处理 

分 类 号：TQ422[化学工程]