Synthesis and luminescence properties of YInGe2O7 phosphors activated by dysprosium ions

The Dy3+-doped YInGe2O7 phosphor was synthesized by solid-sate reaction and calcined at 1300 °C for 10 h in air. The structure and optical properties of YInGe2O7:Dy3+ phosphors have been investigated. XRD results indicated that all of the diffraction peaks can be attributed to the monoclinic YInGe2O7 phase when the Dy3+ ion concentration is increased up to 40 mol%. In the photoluminescence studies, under ultraviolet (349 nm) excitation, the emission spectrum exhibited a weak group of peak for 4M21/24I13/2 + 4K17/2 + 4F7/2 → 6H13/2 at 453 nm, and two groups of strong peak at 484 nm and 574 nm due to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transition of Dy3+ ions, respectively. The optimum concentration for the Dy3+ luminescence is about 10 mol%, indicating that the concentration quenching effect is active when the Dy3+ ion concentration is larger than 10 mol%. The CIE color coordinate of emission is at x = 0.3031 and y = 0.3251, which is located in the near-white light emission region.