摘要
采用柠檬酸溶胶-凝胶法制备了BaMoO4:Eu3+红色荧光粉,差热(DSC)和X射线衍射(XRD)研究结果表明,经过700℃高温烧结后可得到BaMoO4纯物相。粒度分析结果表明,经700℃烧结后样品的粒径约为200nm,随着烧结温度的升高,产物的粒径明显增大,当烧结温度为800℃时,样品的粒径约为500 nm。分别以392 nm的近紫外光和462 nm的可见光激发样品,BaMoO4:Eu3+荧光粉发红光,对应于Eu3+的4f-4f跃迁,其中以615nm附近的5D0→7F2电偶极跃迁发光最强,当Eu3+的掺杂浓度约为25 mol%时,在616 nm处的发光强度最大。荧光粉在392 nm和462 nm的吸收分别与紫外光和蓝光LED芯片相匹配。因此,BaMoO4:Eu3+荧光粉是一种可能应用在白光LED上的红色荧光材料。
BaMoO4：Eu^3＋ phosphors with a precursor were prepared by citric acid sol-gel method at relatively low temperature.X-ray diffraction and DSC results confirmed the formation of BaMoO4.Particle size distribution showed that BaMoO4：Eu3＋ had a diameter around 200 nm.This new method was very simple and had the advantages of small particle size and narrow particle size distribution.Upon excitation with 392 nm and 462 nm light,all the BaMoO4：Eu^3＋ phosphors showed bright red emission due to the 4f-4f transitions of Eu^3＋ ions,and the highest photoluminescence intensity at 615 nm was found at a content of about 25mol % Eu^3＋.The excitation and emission spectra showed that this phosphor could be effectively excited by ultraviolet and blue light,which indicated the BaMoO4：Eu^3＋ phosphor may be a good candidate phosphor for LED application.
出处
《化工技术与开发》
CAS
2009年第4期1-3,12,共4页
Technology & Development of Chemical Industry
基金
广西科学基金资助项目(桂科基No.0731014)
广西大型仪器协作共用网资助(496-2007-075)
