用于白光LED的规则球形YAG:Ce^(3+)荧光粉制备及封装性能研究(英文)  

Synthesis and Packaging Performance of Regular Spherical YAG:Ce^(3+) Phosphors for White LEDs

作　　者：华有杰[1] 马红萍[2] 张驰[1] 邓德刚 赵士龙[1] 黄立辉 王焕平[1] 徐时清[1] 

机构地区：[1]中国计量学院材料科学与工程学院,浙江杭州310018 [2]浙江科技学院机械与自动化工程学院,浙江杭州310012

出　　处：《发光学报》2013年第4期427-432,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51072190,51272243);浙江省自然科学基金(Y1110139);浙江省重点科技创新团队(2010R50016);浙江省科技计划(2012C21064)资助项目

摘　　要：采用高温固相法和筛分法合成了YAG:Ce3+系列黄色荧光粉。采用X射线衍射仪(XRD)、电子扫描显微镜(SEM)、激光粒度分布仪及荧光分光光度计对所制备样品进行了表征。结果表明:所得3种样品形貌规则成球形,粒度分布集中,其中心粒径(D50)分别为29.59,17.40,9.56μm,粒径分布离散度分别为0.85,0.80和0.87。通过Reitveld精修拟合发现,随着荧光粉粒径大小的变化,基质的晶格常数并未发生明显变化。随着中心粒径(D50)逐渐变小,其荧光发射强度逐渐降低,且发生明显的蓝移,同时对蓝光的吸收逐渐减弱。通过对荧光粉与蓝光芯片配合所得白光LED的发光效率、显色指数及色温进行测试发现,当使用相同粉胶比浓度、相同点胶量时,随着荧光粉粒径的减小,所得白光LED的流明效率从109.95 lm/W降低到了99.85 lm/W,而显色指数和色温同时升高。YAG： Ce3 ＋ phosphors with regular spherical morphology and different particle size distribution were suc- cessfully prepared by solid-state reaction followed by sieving method. XRD analysis revealed that crystal lattice pa- rameters nearly unchanged with the variation of particle size. The effect of particle size distribution on optical proper- ties was investigated by spectrophotometer. The results indicated that the absorption of blue light and emission intensi- ty of phosphors simultaneously decreased with decreasing of particle size. Meanwhile, the maximum emission wave- length showed blue shift and chromaticity shifted toward green region with smaller particle size. The packaging per- formance suggested that the reduction in particle size will result in reduction of luminous efficiency. In contrast, the colour temperature （ Tc ） and general colour rendering index （Ra） increased with decreasing of particle size.

关 键 词：荧光粉 光学性能 粒径 白光LED 

分 类 号：O482.31[理学—固体物理]