Synthesis and luminescence characterization of Eu3+-activated Na3La8V3O21 as a red-emitting phosphor

A new red-emitting phosphor of Eu3+-doped Na3La8V3O21 was successfully synthesized by the high-temperature solid state reaction. The phase formation was confirmed by X-ray powder diffraction (XRD) analysis. The morphology of the phosphor was analyzed by scanning electron microscopy (SEM). The optimal doping concentration of Na3La8V3O21:Eu3+ is about 20 mol%. The detailed luminescence properties, e.g., the excitation spectra, the luminescence spectra and quantum efficiency under the excitation of near-UV, and decay lifetimes were reported. The phosphors can be efficiently excited by near-ultraviolet light and exhibit a bright red luminescence around 618 nm ascribed to the forced electric dipole transition D-5(0)-> F-7(2) of Eu3+ ions. The thermal stabilities and the absolute luminescence quantum efficiency (QE) were reported. The phosphors of Eu3+-activated Na3La8V3O21 have been discussed as a candidate for white solid state lighting indicating. (C) 2015 Published by Elsevier B.V.