Red Afterglow Properties of Eu³⁺ in CaMoO₄ Phosphor

Eu³⁺ doped CaMoO₄ phosphors were synthesized by using the solid state reaction method. The x−ray diffraction shows that all the patterns of the obtained samples are indexed to the sheelite structure. Red afterglow originating from the ⁵D₀–⁷F_J (J=0,1,2,3,4) transitions of Eu³⁺ was observed after the samples were excited by 254 nm and the optimal Eu³⁺ concentration in the CaMoO₄ matrix was experimentally determined to be 0.50%. A possible explanation of this afterglow property is also discussed.