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

Dy[Formula: see text] and Eu[Formula: see text] ions co-doped double-perovskite Ba 2 LaNbO 6 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 Dy[Formula: see text] and Eu[Formula: see text] ions co-doped Ba 2 LaNbO 6 was monoclinic phase with space group of C2/m. For the Dy[Formula: see text] ion-doped Ba 2 LaNbO 6 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 4 F[Formula: see text]H[Formula: see text] magnetic dipole transition and the 4 F[Formula: see text]H[Formula: see text] super sensitive transition of Dy[Formula: see text] ion, respectively. The concentration quenching effect occurs as the Dy[Formula: see text] ion concentration is 4 mol%. The CIE chromaticity coordinates shift from the light blue region to the green region as the Dy[Formula: see text] ion doping concentration increases. When the Dy[Formula: see text] and Eu[Formula: see text] ions co-doped Ba 2 LaNbO 6 phosphors, the CIE chromaticity coordinates of Ba 2 (La[Formula: see text] Dy[Formula: see text]Eu[Formula: see text]Nbo 6 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 5 D[Formula: see text]F 1 at 594 nm, and electric dipole transition of 5 D[Formula: see text]F 2 at 617 nm for the characteristic [Formula: see text]–[Formula: see text] transition of Eu[Formula: see text] ion.