Abstract
Dy(3+), Ce(3+) co-doped KY(CO(3))(2) phosphors with a monoclinic structure were synthesized using the hydrothermal method to create a fixed yellow-to-blue ratio emission. The [YO(8)] polyhedron, consisting of a Y atom and eight oxygen atoms, forms a relatively independent microstructure within the KY(CO(3))(2) host. Y(3+) ions are partially replaced by Ce(3+) or Dy(3+) ions to construct the [CeO(8)] or [DyO(8)] polyhedral fluorescence emission unit. The spectral measurements indicate that Ce(3+) and Dy(3+) can maintain relatively independent fluorescence emission characteristics in the KY(CO(3))(2) host. The yellow-to-blue intensity ratio of Dy(3+) remains close to 1 and does not change with the variation in the doping concentration of KY(CO(3))(2):Dy(3+) and KY(CO(3))(2):Dy(3+),Ce(3+) phosphors. When Ce(3+) and Dy(3+) are co-doped with KY(CO(3))(2), the emission intensities of Dy(3+) under 339 nm and 365 nm excitation increase by 8.43 and 2.32 times, respectively, through resonance energy transfer and cross-relaxation. All Ce(3+)-doped KY(CO(3))(2):Dy(3+) phosphors can emit white light. Among them, the emitted light of KY(CO(3))(2):3%Dy(3+),5%Ce(3+) is closest to standard daylight. Therefore, a stable [YO(8)] polyhedral structure can be used to achieve more color tuning of light.