摘要：采用高温固相法制备绿色荧光粉Y₂GeO₅∶Bi³⁺, Tb³⁺, 利用X射线衍射仪、扫描电镜、激光粒度仪和光致发光光谱对其性能进行表征, 并探讨Bi³⁺和Tb³⁺离子掺杂量对发光性能的影响。结果表明, 掺杂Bi³⁺和Tb³⁺分别作为敏化剂和发光中心进入到Y₂GeO₅的晶格中, 最佳掺杂量分别为1.2%、8% (摩尔分数) ;样品为类球形颗粒, 其d₅₀为6.39μm;峰值为314 nm的激发带由Bi³⁺离子、基质激发峰以及Tb³⁺的⁷F₆→⁵D₁复合而成;在314 nm波长激发下, 发射光谱呈现峰值为373 nm宽带和位于430650 nm的多个锐利峰;Bi³⁺离子掺杂使⁵D₄→⁷F₅的发光强度提高3倍。

关键词：光致发光；荧光粉；发射光谱

Abstract：Green phosphors Y₂GeO₅∶Bi³⁺, Tb³⁺were synthesized by high temperature solid state method and characterized by XRD, SEM, laser particle size analyzer and photoluminescence spectrum. The influence of Bi³⁺and Tb³⁺doping concentration on luminescence properties were discussed. The results indicate that Bi³⁺and Tb³⁺respectively act as sensitizer and luminescence center into the crystal lattice of Y₂GeO₅, whose optimum doping concentrations are 1.2% and 8%. d50of nearly spherical phosphor Y₂GeO₅∶Bi³⁺, Tb³⁺is about 6.39 μm. A broadband excitation at 314 nm is attributed to a composite of broadband by excitations of Bi3+ion and host with⁷F₆→⁵D₁of Tb³⁺. Under the excitation of 314 nm, a broadband at 373 nm and sharp lines between 430 and 650nm are presented. The intensity of⁵D₄→⁷F₅is enhanced about 3 times by co-doping Bi³⁺ion.

Keywords：photoluminescence; phosphor; emission spectrum