LED用YAG:Ce^(3+)荧光粉包覆SiO_2膜的研究

Study on SiO_2 surface coating of YAG:Ce^(3+) phosphor using for LED

选用热稳定性好、无色透明的SiO2为包覆物,采用溶胶法,以正硅酸乙酯(TEOS)为硅源,对YAG:Ce3+荧光粉的表面进行SiO2膜的包覆研究,以解决LED荧光粉在使用过程中突出的热劣化问题。采用X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM)和荧光光谱(FS)等对包膜前后的YAG:Ce3+荧光粉的晶体结构、表面形貌、发光性能等进行表征和分析。结果表明,YAG:Ce3+荧光粉表面上包覆了一层均匀且致密的氧化硅膜层,且对包膜后的YAG:Ce3+荧光粉的发光性能基本没有影响,包覆效果较好。

YAG：Ce3＋ phosphor was studied by the surface coating technology to solve the problem of thermal degradation of LED.The silicon dioxide was chose as coating material according to its excellent physical and chemical properties.The sol method was used to coat the YAG：Ce3＋ phosphor with TEOS as silicon reagent.The phase composition,microstructure and luminescence properties were characterized by SEM,XRD,TEM and FS.The results indicated that a compact homogeneous silicon dioxide film was coated on the surface of YAG：Ce3＋ phosphor particles successfully,and the luminescence properties of the YAG：Ce3＋ phosphor was not affected by the film.