Synthesis and luminescence properties of (Dy3+, Eu3+) ions co-doped double-perovskite Ba2LaNbO6 phosphors

Dy3+ and Eu3+ ions co-doped double-perovskite Ba2LaNbO6 phosphor was prepared by a high-temperature solid-state reaction method. The effects of ions co-doping concentration onto the crystal structures, surface morphologies and photoluminescence properties of phosphors were elucidated by using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), and fluorescence spectrophotometer, respectively. The XRD patterns reveal that the crystallization of Dy3+ and Eu3+ ions co-doped Ba2LaNbO6 was monoclinic phase with space group of C2/m. For the Dy3+ ion-doped Ba2LaNbO6 phosphors under an excitation wavelength of 293 nm, the main emission wavelengths are between 460 and 520 nm and 560 and 620 nm, which are due to the F-4(9/2) -> H-6(15/2) magnetic dipole transition and the F-4(9/2)-> H-6(13/2) super sensitive transition of Dy3+ ion, respectively. The concentration quenching effect occurs as the Dy3+ ion concentration is 4 mol%. The CIE chromaticity coordinates shift from the light blue region to the green region as the Dy3+ ion doping concentration increases. When the Dy3+ and Eu3+ ions co-doped Ba2LaNbO6 phosphors, the CIE chromaticity coordinates of Ba-2(La-0.9575 Dy0.04Eu0.0025)NbO6 phosphors are moved from the green light region to the near white-light region due to the mixing of the strong magnetic dipole transition of D-5(0) -> F-7(1) at 594 nm, and electric dipole transition of( 5)D(0) -> F-7(2) at 617 nm for the characteristic f-f transition of Eu3+ ion.

Automated summary

The Dy3+ and Eu3+ co-doped Ba2LaNbO6 phosphor was prepared by a high-temperature solid-state reaction method. The effects of ion co-doping concentration on the crystal structures, surface morphologies, and photoluminescence properties of the phosphors were investigated. It was found that the emission wavelengths and CIE chromaticity coordinates of the phosphors changed with the concentration of Dy3+ ions, and the co-doping of Dy3+ and Eu3+ ions resulted in phosphors with characteristics closer to white light.