基于超声喷雾热解法制备的球形YAG:Eu^3+荧光粉性能表征  

Performance characterization of spherical YAG:Eu^3+phosphors prepared by ultrasonic spray pyrolysis

作　　者：陈静[1] 祝洪良[1] 刘一夫 李雪 CHEN Jing;ZHU Hongliang;LIU Yifu;LIXue(School of Materials Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2020年第5期595-601,共7页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(51872262);浙江省自然科学基金项目(LY18B010008)。

摘　　要：为实现球形YAG:Eu^3+荧光粉的大规模生产,提出通过超声喷雾热解法制备尺寸均匀的球形YAG:Eu^3+荧光粉。先将含有三种金属离子(Y、Al和Eu)的硝酸盐配置成前驱体溶液,然后利用超声高频谐振器将前驱体溶液转为雾滴,再将前驱体雾滴在管式炉中快速蒸发、脱水,聚拢成球形固体前驱体,最后在900℃的管式炉中原位晶化转为YAG:Eu^3+荧光粉。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)对产物的物相、形貌和成分进行分析。结果表明:制备所得产物是纯立方结构的YAG:Eu^3+荧光粉,呈现出规则的球形形貌,尺寸分布范围窄(1.00~3.00μm),平均直径为1.59~2.55μm;荧光粉直径会随着前驱体摩尔浓度的升高而增大;发光光谱显示,球形YAG:Eu^3+荧光粉在紫外光的激发下,在594nm和615nm处表现出典型的红光发射。文章采用的超声喷雾热解法具有连续、可控、产物均匀规律等特点,有望在球形YAG:Eu^3+荧光粉的生产中得到实际应用。In order to achieve large-scale production of YAG:Eu^3+ phosphors, a method was proposed to prepare spherical YAG:Eu3+ phosphors with a uniform size by ultrasonic spray pyrolysis process. In this process, the nitrates containing three metal ions(Y, Al and Eu) were mixed to prepare precursor solutions which were then converted into mist droplets by using an ultrasonic high-frequency resonator. Next, the precursor mist droplets were evaporated and dehydrated fast in the tube furnace to gather into a spherical solid precursor. Finally, the spherical solid precursor was crystallized in situ in a 900 ℃ tube furnace to transform into YAG:Eu^3+ phosphor. X-ray diffraction(XRD), scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy(EDS) were used to analyze the phase, morphology and composition of the product. The results show that: the product is YAG:Eu^3+ phosphor with a pure cubic structure. The products presented regular spherical morphology, and the size distribution range was narrow(1.00~3.00 μm), with the average diameter of 1.59~2.55 μm. Moreover, the product diameter would increase with the rise of molar concentration of the precursor. Luminescence spectroscopy studies show that spherical YAG:Eu3+ phosphors exhibited typical red light emission at 594 nm and 615 nm under the excitation of ultraviolet light. Compared with the traditional process, the new ultrasonic spray pyrolysis process proposed in this paper has the characteristics of continuity, controllability and uniformness, and is expected to be practically applied in the production of YAG:Eu^3+ phosphor.

关 键 词：YAG:Eu^3+ 荧光粉 超声喷雾热解法 发光性能 

分 类 号：TB34[一般工业技术—材料科学与工程]