Photoluminescent properties of the promising red-emitting phosphor LiGd1-xEux(MoO4)2 for WLEDs

A series of LiGd1-xEux(MoO4)(2) (x=0.01-1) red-emitting phosphors were synthesized by the conventional solid-state reaction method. XRD was used to determine the structure of the samples, showing that the products are single phased with sheelite-like structure. The photoluminescent properties were characterized by a fluorescence spectrophotometer and the effects of the calcination temperature, the holding time as well as the doping concentration, especially the low doping concentration of Eu3+, were discussed. Upon excitation with 395 nm, the LiGd(MoO4)(2):Eu3+ phosphors show strong red emission lines at 617 nm which are ascribed to the forced electric dipole transition D-5(0)-F-7(2) of Eu3+. The appropriate calcination temperature and holding time are 900 degrees C and 5 h, respectively. With increasing Eu3+ doping concentration, the emission intensity of the samples is enhanced and no obvious concentration quenching occurs. The prepared samples are potential red phosphors for near UV White LEDs application. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.