YAG:Ce黄色荧光粉高温固相合成与表征  

Synthesis and Characterization of YAG:Ce Yellow Phosphor by High Temperature Solid Phase Method

作　　者：黎学明[1] 何南玲[1] 陶传义[1] 

机构地区：[1]重庆大学化学化工学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2007年第2期103-106,共4页Journal of Chongqing University

基　　金：重庆市自然科学基金重点资助项目(CSTC2005BA4016)

摘　　要：荧光粉是制备白光发光二极管(LED)关键材料之一,其性能直接影响着白光LED亮度、色度、色温及显色指数.但是,现有荧光粉由于稳定性差、光衰严重等问题,使白光LED不能达到预期目标,迫切需要改进其制备工艺.采用高温固相合成法制备YAG:Ce3+黄色荧光粉,研究温度、Ce添加量等对荧光粉粒度、荧光强度等理化性质影响规律,并评价该荧光粉与蓝光LED芯片组合形成白光LED的性能.结果表明,烧结温度高于1400℃时,荧光粉呈立方结构纯YAG晶相;温度越高,形成的粉末粒径越大,发光强度越高;Ce掺杂量x=0.06时,烧结的荧光粉发光强度最大;封装形成的Φ3 mm白光LED亮度为5581 cd/m2,色坐标x=0.2626,y=0.2753,色温Tc=13000 K.Phosphors is one of the key materials in white LED preparation, ＂its properties influence the brightness, color coordinate, color temperature and color rendering index of white LED directly. But, the existing phosphors cannot realize the purpose, because of its poor stabilization and light attenuation. Therefore, the preparation techniques need to be optimized. The YAG：Ce^3＋ yellow phosphors are synthesized by high temperature solid phase method. The effects of sintering temperature, granularity and amount of doped Ce on phosphor＇s physical and chemical properties are studied. Furthermore, the performance of white LED is studied by combination of blue LED chip and our yellow phosphors. The results show that, the phosphor is pure YAG crystal phase when sintering temperature is above 1 400 ℃. Along with increasing temperature, the granularity would become bigger and emitting intensity of phosphor is enhanced. And when phosphors doped with 0.6% Ce, emitting intensity will be the highest. The luminance of our LED was 5 581 cd/m^2. The CIE is x =0.262 6 ,y =0.275 3 ,and color temperature is Tc = 13 000 K.

关 键 词：YAG荧光粉 固相法 白光LED 

分 类 号：TN104.3[电子电信—物理电子学]