Effects of cationic substitution on the luminescence behavior of Dy3+ doped orthophosphate phosphor

Effects of cationic substitution on the luminescence behavior of Dy3+ doped orthophosphate (A(3)B(PO4)(2); A = K, Na; B = Y, La) phosphors synthesized by the solution combustion method were investigated. The powder X-ray diffraction (PXRD) and photoluminescence (PL) studies were done to examine the structural and luminescence behavior of Dy3+ ions in the phosphate lattices. The PXRD results ascertained that the phosphors have the desired phases corresponding to their standards. Under UV-excitation, the PL emission spectra of the phosphors exhibited three bands at 481 +/- 2 nm (blue band), 575 +/- 1 nm (yellow band) and 668 +/- 2 nm (red band) ascribed to the F-4(9/2) -> H-6(15/2), F-4(9/2) -> H-6(13/2) and F-4(9/2) -> H-6(11/2) characteristic 4f-4f transition of the Dy3+ ions, respectively. The luminescence behavior, the Stark splitting of the emission band and symmetry around the Dy3+ ions in the host lattice were discussed on the grounds of distortion induced in the host lattice upon Dy3+ doping. The photometric results including high quantum efficiency, commission international de l'Eclairage coordinates near to standard white light coordinates, color correlated temperature (>5000 K) and high thermal stability imply that the phosphor could be an appropriate choice for single phosphor-based white light-emitting diodes. (C) 2019 Elsevier B.V. All rights reserved.