YAG荧光粉的表面改性及其发光和热/湿劣化性能研究  

Investigation of improved luminescent properties and the thermal-wet degradation of YAG:Ce^(3+) phosphors with surface modification

作　　者：王富强 王乐 张宏 陈如标 郑紫珊 WANG Fuqiang;WANG Le;ZHANG Hong;CHEN Rubiao;ZHENG Zishan(College o~ Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学光学与电子科技学院,浙江杭州310018

出　　处：《中国计量大学学报》2018年第2期163-168,180,共7页Journal of China University of Metrology

基　　金：国家重点研发计划项目(No.2017YFB0403105);国家自然科学基金资助项目(No.61575182);浙江省公益技术应用研究计划项目(No.2018C37042)

摘　　要：采用高温固相法合成了YAG:Ce^(3+)黄色荧光粉,基于Stober法的包覆技术对YAG:Ce^(3+)进行了SiO_2包覆实验,研究了表面包覆对荧光粉发光特性的影响;并系统探讨了YAG:Ce^(3+)@SiO_2荧光粉的耐高温高湿性能.研究表明,通过改进包覆工艺实现了形貌均匀的YAG:Ce^(3+)@SiO_2核-壳荧光粉;当包覆粒径在100nm左右时,粉体表面缺陷改善,发光强度相对于YAG:Ce^(3+)荧光粉提高了34%;设计并实现了高温高湿实验,在相同实验条件下与YAG:Ce^(3+)荧光粉对比,YAG:Ce^(3+)@SiO_2荧光粉在180℃时的发光强度衰减减小了4%,同时在180℃对应的湿度条件下,发光光谱强度衰减减小了8%.这表明,表面改性技术有效地改善了荧光粉的热稳定性和耐湿性,将有效促进蓝光芯片激发黄光荧光粉的白光LED在室外大功率照明中的应用.The SiO2 coated YAG： Ce3＋yellow phosphor was prepared by the Stober method. The effect of the coating on the luminescence properties as well as the thermal and moisture resistance of the phosphor were investigated comprehensively. The results showed that the YAG：Ce3＋ @SiO2 core shell phosphor with uniform morphology could be obtained by improving the coating parameters. When the coating particle size was about 100nm,the surface defect of the powder was improved and the luminous intensity was increased by 34% compared with the behavior of the YAG： Ce3＋ phosphor. High temperature and high moisture experiments were designed and realized successfully. Compared with the YAG：Ce3＋ phosphor under the same experimental conditions, the luminous intensity attenuation values of the YAG： Ces＋ @ SiO2 phosphor at 180 ℃ and its corresponding humidity decreased by 4%and 180℃ respectively. The surface modification technology can improve thethermal stability and moisture resistance of phosphors, which can effectively promote the excitation of yellow phosphors by blue chips for the application of white LEDs usecl in outdoor high power lighting.

关 键 词：白光LED YAG:Ce3+@SiO2荧光粉 表面改性 光衰 热稳定性 

分 类 号：TN383.2[电子电信—物理电子学]