助熔剂对绿色荧光粉Ba_2SiO_4:Eu^(2+)颗粒形貌及发光性能的影响  

Effect of Fluxes on Morphology and Luminescent Properties of Ba_2SiO_4:Eu^(2+) Green Phosphor

作　　者：李雪静[1] 梁玉军[1] 杨帆[1] 夏章艮[1] 李云丽[1] 黄文珠[1] 

机构地区：[1]中国地质大学(武汉)材料与化学学院,湖北武汉430074

出　　处：《发光学报》2012年第8期817-823,共7页Chinese Journal of Luminescence

基　　金：国家自然科学基金(21171152);广东省部产学研项目(2010B090400437)资助项目

摘　　要：采用高温固相法在弱还原气氛下合成了Ba2SiO4∶Eu2+绿色荧光粉,利用X射线衍射、扫描电子显微镜和荧光分光光度计考察了不同助熔剂对Ba2SiO4∶Eu2+荧光粉的结晶度、物相纯度、颗粒形貌和发光强度的影响,并详细讨论了不同助熔剂在荧光粉制备过程中的作用机理。结果表明:不加助熔剂时样品存在BaSi2和SiO2杂相;利用NH4F、Na2CO3或H3BO3作为助熔剂时会抑制BaSi2杂相的形成,而BaF2作助熔剂可以得到纯的斜方晶系。与未加助熔剂合成的荧光粉相比,添加质量分数为2%的BaF2、NH4F或Na2CO3后合成样品的发光强度分别提高了138%,81%和34%;而质量分数为2%的H3BO3作助熔剂时,荧光粉的发光强度反而降低了14%。BaF2作助熔剂合成的荧光粉颗粒形貌接近球形,以NH4F、Na2CO3或H3BO3作助熔剂合成的荧光粉颗粒形貌分别为不规则片状、纺锤体形和不规则多边形大颗粒。A series of Ba2SiO4∶Eu^2＋ green phosphors have been synthesized by high temperature solid state method.The effects of different fluxes on the crystal structure,surface morphology and spectral characteristics of Ba2SiO4∶Eu^2＋ phosphors were systematically investigated by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM） and fluorescence spectrophotometer.The function mechanism of different fluxes on the preparation of Ba2SiO4∶Eu^2＋ phosphors have also been discussed.XRD results show that the Ba2SiO4∶Eu^2＋ phosphor without flux has the impurity phase of BaSi2 and SiO2 during firing,while fritted with NH4F,Na2CO3 or H3BO3 flux,the impurity phase of BaSi2 can be suppressed.BaF2 flux can get the pure orthorhombic.By comparing the influence of different fluxes on the emission of Eu^2＋,it was found that the emission intensity of the Ba2SiO4∶Eu^2＋ phosphor with 2% mass fraction of BaF2,NH4F or Na2CO3 flux improved by 138%,81%,34% than that of the powder without the flux material,while the luminescent intensity reduced 14% when using 2% mass fraction of H3BO3 as flux.The phosphor powders were spherical-like shapes using BaF2 as the flux,while the phosphor powder prepared with NH4F,Na2CO3 or H3BO3 as flux had the irregular laminated structure,spindle shape and irregular polygon,respectively.

关 键 词：Ba2SiO4:Eu2+ 固相法 助熔剂 荧光粉 

分 类 号：O482.31[理学—固体物理]