白光LED用LaPO₄:Eu³⁺红色荧光粉的合成与表征

来源期刊：有色金属科学与工程2012年第4期

论文作者：廖金生 周单 杨斌 张骞 周全惠 武淑珍

文章页码：31 - 35

关键词：LED；水热法；LaPO₄:Eu³⁺；红色荧光粉

Key words：LED; hydrothermal method; LaPO₄:Eu³⁺; red phosphor

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:Eu³⁺; SEM图像显示5 at.% Eu³⁺掺杂LaPO₄呈椭球形，颗粒长约为500 nm，宽约为300 nm最大发射波长和激发波长分别为592 nm和393 nm，发射光谱中592 nm和612 nm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。

Abstract: A stable LaPO₄:Eu³⁺ red phosphor was prepared by hydrothermal method. The influences of the concentration of Eu³⁺ and 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:Eu³⁺ crystals of monoclinic phase annealing at 900℃, the length of crystal is about 500 nm, the width is about 300 nm. 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:Eu³⁺ phosphor is 3.32 ms.