硼酸对亚微米级Ca3Sc2Si3O12:Ce绿色荧光粉的制备及发光性能的影响

采用凝胶-燃烧法合成了Ca₃Sc₂Si₃O₁₂ ∶Ce绿色LED用荧光粉,用X射线粉末衍射(XRD)、扫描电镜(SEM)、荧光光谱仪等对合成产物进行了分析和表征.结果表明:通过添加H₃BO₃做助熔剂,制得的荧光粉晶相纯正,颗粒形貌均呈现为较规则的类球形,而且所得荧光粉的粒径均小于1 μm.发射光谱呈现为一宽带,发射主峰位于505 nm,该宽峰对应于Ce^{3+关键词：白光LED荧光粉3Sc₂Si₃O₁₂ ∶Ce')" href="#">Ca₃Sc₂Si₃O₁₂ ∶Ce发光}

Effect of H3BO3 on preparation and luminescence properties of submicron green-emitting Ca3Sc2Si3O12:Ce phosphor

Green-emitting Ca₃Sc₂Si₃O₁₂:Ce³⁺ phosphors for white LED are successfully synthesized by a gel-combustion method. The as-synthesized phosphors are investigated by XRD, SEM, and fluorescence spectrophotometer. The results indicate that the crystal structure of the phosphor is pure. The particle morphology of the sample is basically spherical in shape. The particle size is smaller than 1μm. The emission spectrum shows a broad band emission, and the main emission peak locates at 505 nm. Bright green-emission broadening is attributed to the characteristic emissions 5d-²F_5/2 and 5d-²F_7/2 transitions of Ce³⁺. The optimal doping concentration of Ce in Ca_3-xSc₂Si₃O₁₂:Ce is x=0.1. The thermal stability and the luminescence intensity of the Ca₃Sc₂Si₃O₁₂:Ce³⁺ are significantly improved compare with those of YAG:Ce.