Optical properties of Eu3+/Dy3+ doped BaY2(MoO4)4 white light phosphor

Hydrothermal synthesis was used to create a series of BaY2(MoO4)4: Dy3+/Eu3+ white phosphors. Two distinct peaks were produced in the BaY1.9(MoO4)4: 0.1Dy3+ phosphor sample at 485 nm (4F9/2 -> 6H15/2) and 575 nm (4F9/2 -> 6H13/2) upon excitation at 353 nm. In BaY1.9(MoO4)4: 0.1Dy3+, yEu3+ phosphor, the existence of energy transfer in the BaY1.9(MoO4)4: 0.1Dy3+, yEu3+ phosphor system was verified by the lifetime reduction through the substitution of Y3+ by Eu3+, with an energy transfer efficiency of up to 62.01 %. The characteristic peak of Eu3+ at 615 nm, which can achieve a color adjustment from light blue to white, is produced when the amount of Eu3+ is increased, the energy transfer mode is 7F0 + 4F9/2 -> 5D0 + 6H15/2. These results demonstrate that the luminescence intensity ratio of BaY2(MoO4)4: 0.1Dy3+, yEu3+ phosphor is 93.82 % at 423/303 K, showing excellent thermal stability. This indicates the potential application of BaY2(MoO4)4 phosphors co-doped with Dy3+ and Eu3+ in lighting devices.