核壳结构的Al2O3/YAG：Ce荧光粉的喷雾干燥法制备及形成机理(英文)  

Preparation of a Core-Shell Structured Al_2O_3/YAG:Ce Phosphor by a Spray Drying Method and Formation Mechanism

作　　者：韩涛[1,2] 彭玲玲[1] 曹仕秀[1] 朱达川[2] 涂铭旌[1,2] 张进[1] 

机构地区：[1]重庆文理学院重庆市高校微纳米材料工程技术重点实验室,重庆402160 [2]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2014年第10期2311-2315,共5页Rare Metal Materials and Engineering

基　　金：Natural Science Foundation Project of CQ,CSTC(cstc2012jjA50039,cstc2011jjB50012)

摘　　要：采用喷雾干燥法制备核壳结构的Al2O3/YAG：Ce荧光粉,所得样品为立方Y3Al5O12结构,球形颗粒的粒径为1~8μm,显示出比共沉淀法高的内部量子效率。核壳结构的Al2O3/YAG：Ce荧光粉的形成机理为,起始悬浮液包含微米级的Al2O3和Y3＋、Al3＋、Ce3＋等形成的聚阳离子,经过雾化形成小液滴,在溶剂挥发过程中,由于聚阳离子比微米级的Al2O3的迁移速度大,在颗粒间的毛细管力的作用下,自组装成为聚阳离子包裹微米级的Al2O3的核壳型结构,在850~1250℃时焙烧2 h,就得到了核壳型的荧光粉。The core-shell structured Al2O3/YAG：Ce phosphor was prepared by a spray drying method.The obtained samples show cubic Y3Al5O12 structure,have a spherical shape with the size in the range of 1~8 μm and exhibit higher internal quantum yield compared to the samples prepared by co-precipitation.Based on the fact that the spray drying method can be employed to fabricate microencapsulate particles,the formation mechanism of the core-shell structured Al2O3/YAG：Ce phosphor was formulated.The slurry,which was mixed with micrometer Al2O3 particles and polycations consisting of Y3＋,Al3＋ and Ce3＋,was atomized and shaped by the evaporation of droplets.In the process of solvent evaporation,the interparticle capillary forces make the self-assembly of polycations into the close-packed shell surrounding the Al2O3 particles,because the polycations have a bigger diffusion rate than Al2O3 particles.At last,the precursor was calcined at the temperature from 850 oC to 1250 oC for 2 h and then the core-shell structured phosphor was produced.Therefore,a novel idea for preparing core-shell structured phosphor is proposed.

关 键 词：荧光粉 核壳结构 机理 喷雾干燥法 

分 类 号：O611.4[理学—无机化学] TQ422[理学—化学]