【作者】 陈哲； 严有为；

【Author】 CHEN Zhe~1 YAN You-wei~2 (1.Nanchang Institute of Technology,Nanchang,330099,China;2.State Key Lab of Die & Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

【机构】 南昌工程学院； 华中科技大学模具技术国家重点实验室；

【摘要】 以廉价的 MgCl₂和 NH₄F 为原料用乳胶法在纳米 BaMgAl₁₀O₁₇：Eu²⁺（BAM）蓝色荧光粉颗粒表面成功地包覆了一层均匀致密的 MgF₂包覆层．利用 XRD、 XPS、TEM 和 EDS 对纳米 BAM 包覆颗粒的化学成分和微观结构进行了表征,并通过真空紫外激发光谱测试了其光谱特性。结果表明,MgF₂包覆层紧密地附着在 BAM 颗粒表面．包覆层对 BAM 纳米颗粒表面起到了很好的修饰作用,有效降低了 BAM 荧光粉的无辐射跃迁机率,使 BAM 的发光性能得到明显改善．更多还原

【Abstract】 Taking the use of cheap MgCl₂ and NH₄F as raw materials,MgF₂ was successfully coated at the surface of nano-sized BaMgAl₁₀O₁₇:Eu²⁺phosphor particles by an emulsion method.The chemical compositions,microstructure,and luminescent performance of surface-coating BAM were characterized by XRD,XPS,TEM,EDS and VUV excitation, respectively.The results indicate that a compact homogeneous MgF₂ film successfully forms on the surface of BAM particles.The luminescent performances of BAM with perfect surface modification is greatly improved due to the hanging-bonds and defects on the surface of nano-scale BAM particles being removed as well as non-radiative transition probability decreasing.更多还原