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

中图分类号：O482.3                文献标志码：A

DOI：10.3969/j.issn.1008-5548.2013.05.015