Synthesis and luminescence properties of Eu3+-activated NaLa(MoO4) (WO4) phosphor

NaLa1-y(MoO4)(2-x)(WO4)(x):yEu(3+) series red-emitting phosphors have been synthesized by a combustion route and their crystal structure, optical and luminescent properties have been investigated. Their emission spectra show an intense red emission at 616 nm due to the D-5(0) -> F-7(2) transition of Eu3+. As the tungstate content increases, the intensity of D-5(0) -> F-7(2) emission of Eu3+ activated at wavelength of 467 nm is found to increase and reaches a maximum when the relative ratio of Mo/W is 1:1. Also, the effect of Eu3+ concentration on the luminescence behavior of the solid solutions is examined. The optical properties of NaLa0.9Eu0.1(MoO4)(WO4) phosphor make it attractive for the application in white-lighte-mitting diodes (LEDs), in particular for near-UV InGaN-based white-LEDs. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.