小粒径BaMgAl_(10)O_(17):Eu^(2+)荧光粉的合成机理  

SYNTHESIS MECHANISM OF FINE PARTICLE BaMgAl_(10)O_(17):Eu^(2+) PHOSPHOR

作　　者：董岩[1] 蒋建清[1] 顾维杰[1] 陈蓉[1] 吴直森[1] 邵起越[1] 

机构地区：[1]东南大学材料科学与工程学院,南京211189

出　　处：《硅酸盐学报》2010年第12期2225-2229,共5页Journal of The Chinese Ceramic Society

基　　金：高等学校科技创新工程重大项目培育资金(707029);江苏省自然科学基金(BK2008317)资助项目

摘　　要：使用化学沉淀法制备细粒径、分散性好的圆饼状α-Al2O3粉体,并以此为原料,通过高温固相法制备粒径细小、颗粒形貌规则的高性能BaMgAl10O17:Eu2+(BAM)荧光粉,重点研究合成过程中的物相转变及颗粒生长等过程。结果表明:氧化铝原料颗粒对最终BAM荧光粉的颗粒形貌和粒径起到重要作用,经过1500℃煅烧2h后生成的BAM仍基本维持原α-Al2O3颗粒的圆饼状外形,颗粒粒径仍为2.5μm左右且分散性良好。高温固相法制备BAM荧光粉的过程中,1000℃时,首先在α-Al2O3颗粒表面反应形成一层BaAl2O4相,当温度继续升高,MgO参与反应,通过BaAl2O4层进行传质过程,并最后完全转变为BaMgAl10O17相。发光性能测试表明:使用自制氧化铝制备的BAM荧光粉具有良好的发光特性,其发射光谱峰的强度和半峰宽与使用商用氧化铝原料所制得的荧光粉的相当。Small particle size and well dispersed round cake-like α-Al2O3 powder was prepared by a chemical precipitation method,and fine particle,regular shape BaMgAl10O17：Eu2＋（BAM） phosphor was synthesized using the α-Al2O3 powder as a raw material.Phase transformation and particle growth processes were analyzed by the X-ray diffraction and scanning electron microscopy.The results show that the shape and size of the BAM phosphor particles have close association with the original α-Al2O3 particles,the BAM particles retain a cake-like shape with a size of 2.5 μm and a good dispersity after being calcined at 1 500 ℃ for 2 h in air.The results also show that a shell of BaAl2O4 phase is formed on surface of the α-Al2O3 particle when the temperature reaches 1 000 ℃,and then MgO is involved in the reaction when the temperature increases.The mass transfer continues through BaAl2O4 shell,and eventually a pure BaMgAl10O17 phase is formed.The luminescence property of the BAM phosphor using the self-made alumina is similar to that using a commercial alumina powder.

关 键 词：荧光粉 合成机理 粒径 氧化铝 

分 类 号：O611.4[理学—无机化学]