Tunable luminescence and energy transfer properties in Ca2−xNaMg2V3O12:xEu3+ phosphors

Novel broadband luminescence phosphors Ca2−xNaMg2V3O12:xEu3+ have been successfully prepared via the conventional high-temperature solid-state reaction. The effects of concentrations of doped Eu3+ and introducing Li+, K+ on the luminescent properties of phosphor were studied. X-ray diffraction, GSAS structural refinement and photoluminescence spectra were used to characterize the samples. The refinement data ensured where the doped Eu3+ ions occupied the lattice site in the host. Under 355 nm excitation, the emission peak of Ca2NaMg2V3O12:Eu3+ phosphors are located at 610 nm (red) ascribed to the electric dipole transition of Eu3+ from 5D0 → 7F2. In the range of 400–575 nm, Ca2NaMg2V3O12:Eu3+ phosphors have broad emission bands attributed to charge transfer of \({\text{VO}}_4^{3 - }\) group. Energy transfer mechanism, energy transfer efficiency and critical distance (Rc) of \({\text{VO}}_4^{3 - }\) → Eu3+ would be analyzed. The emitting color of Ca2NaMg2V3O12:Eu3+ could be tunable from blue-green to near white light.