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

Abstract

Dy[Formula: see text] and Eu[Formula: see text] 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 Dy[Formula: see text] and Eu[Formula: see text] ions co-doped Ba2LaNbO6 was monoclinic phase with space group of C2/m. For the Dy[Formula: see text] 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 4F[Formula: see text]H[Formula: see text] magnetic dipole transition and the 4F[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 Ba2LaNbO6 phosphors, the CIE chromaticity coordinates of Ba2(La[Formula: see text] Dy[Formula: see text]Eu[Formula: see text]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 5D[Formula: see text]F1 at 594 nm, and electric dipole transition of 5D[Formula: see text]F2 at 617 nm for the characteristic [Formula: see text]–[Formula: see text] transition of Eu[Formula: see text] ion.