LED用红色荧光粉LaPO4Eu的合成和表征-有色金属科学与工程.doc

白光LED用LaPO4:Eu红色荧光粉的合成与表征 廖金生*，周单，杨斌，张骞，周全惠，武淑珍 （江西理工大学冶金与化学工程学院，江西 赣州 34100） 摘要：利用水热法制备了性能稳定的红色荧光粉LaPO4:Eu3+，同时研究了不同的Eu3+浓度、煅烧温度对荧光粉发光性能的影响。通过X射线粉末衍射(XRD)和扫描电子显微镜(SEM)来表征荧光粉的晶体结构和颗粒大小及形貌；用激发光谱和发射光谱以及荧光衰减曲线来表征荧光粉的荧光性能。结果表明：未煅烧时前躯体主要是六方晶相LaPO4(0.5H2O，煅烧温度在900℃时，所制备样品为单斜相LaPO4:Eu；SEM图像显示5at.% Eu3+掺杂LaPO4呈椭球形，颗粒长约为500nm，宽约为300nm。最大发射波长和激发波长分别为592nm和393nm，发射光谱中592nm和612nm的发射峰对应的是Eu3+离子的5D0→7F1和5D0→7F2跃迁。其荧光寿命为3.32ms。 关键词:LED；水热法；LaPO4:Eu3+；红色荧光粉 中图分类号：TF845；TQ133.2 文献标识码：A Synthesis and characterization of LaPO4:Eu red phosphor for application in white LED LIAO Jin-sheng, ZHOU Dan, YANG Bin, ZHANG Qian, ZHOU Quan Hui, WU Shu-zhen (School of metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China) Abstract：A stable LaPO4:Eu3+ red phosphor w prepared by hydrothermal method. The influences of the concentration of Eu3+ and the calcination temperature on the luminescent properties were studied. The crystal structure, particle size and morphology were characterized by X-Ray Powder Diffraction (XRD) and Scanning Electron Microscope (SEM) techniques. The luminescent properties of phosphor were measured by emission spectra, excitation spectra and decay curve. The results indicate that the precursors are the LaPO4(0.5H2O crystals of hexagonal without heat-treatment, the as-prepared samples are LaPO4:Eu crystals of monoclinic phase annealing at 900℃, the length of crystal is about 500nm, the width is about 300nm. The maximum emission and excitation wavelength are at 592 nm and 393 nm, respectively. The emission peaks at 592 nm and 612 nm are corresponding to 5D0-7F1 and 5D0-7F2 transition of Eu3+ ions in emission spectrum. The fluorescence lifetime of LaPO4:Eu phosphor is 3.32ms. Key words: LED; hydrothermal method; LaPO4:Eu3+; red phosphor 0引言 近年来，随着白光LED制备技术的不断发展以及它的应用领域的不断扩展[1-3] ，LED用荧光粉的性能和制备越来越受到人们的重视。尤其是可被紫外光激发的红色荧光粉的性能直接影响着白光LED的显色性，科研人员正持续改进和发展新的高效红色荧光，它们将有力促进LED实现普通照明PEG2000辅助水热法制备 1实验 1.1 试剂 实验所用试剂：硝酸