Preparation and tunable luminescence of CaCO3:Eu3+,Dy3+ phosphors
Abstract
Phosphors based on calcium carbonate, co-doped with various Eu3+ and Dy3+ concentrations were prepared by microwave co-precipitation method. The prepared phosphors were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry and differential scanning calorimetry (TG-DSC) and photoluminescence and photoluminescence excitation (PL-PLE) spectroscopy. Results showed that Dy3+ and Eu3+ ions were uniformly introduced into the host lattice of CaCO3 taking the place of Ca2+ ions. Under the excitation at 382 nm, the emission peak wavelengths were at 487 nm (4F9/2 → 6H15/2 of Dy3+), 576 nm (4F9/2 → 6H13/2 of Dy3+), and 614 nm (5D0 → 7F2 of Eu3+). The luminescent intensities and emitting colors of Eu3+-Dy3+ co-doped CaCO3 phosphors could be controlled by UV–violet excitations wavelengths or the rare-earth ions concentrations of Eu3+ and Dy3+ in phosphors. The chromaticity coordinates and photographs of samples under UV light showed the changes of the luminescence color intuitively through the varing UV–violet excitations wavelengths or the rare-earth ions concentrations of Eu3+ and Dy3+.
