Preparation and fluorescence properties of color tunable phosphors Ca₃Y₂(Si₃O₉)₂:Dy³⁺.

A novel reddish-orange phosphor, Ca3Y(2-2x)(Si3O9)2:2xDy(3+), was synthesized via conventional solid-state reaction. Its photoluminescence properties were investigated. With increasing Dy(3+) concentration, the luminescence intensity first increases, reaches the greatest, and then decreases. The concentration quenching mechanism is based on the electric dipole-dipole interaction. The decay times were also determined.