A novel broadband emission phosphor Ca2KMg2V3O12 for white light emitting diodes

A novel broadband emission phosphor Ca2KMg2V3O12 was first synthesized by solution combustion method. The X-ray diffraction showed that Ca2KMg2V3O12 phase can be obtained at 600-900 degrees C through combustion route. The crystal structure of this material was refined by Rietveld method using powder Xray diffraction. It crystallizes in cubic system and belongs to space group la3d with z = 8, a = 0.12500 nm. The excitation band of Ca2KMg2V3O12 peaks at 320 nm in a region between 260 nm and 425 nm, and the emission spectrum exhibits an intense band centered at about 528 nm covering from 400 nm to 800 nm. The colour coordinates of samples prepared at different ignition temperatures are in a range of x = 0.323-0.339, y = 0.430-0.447. (C) 2010 Elsevier Ltd. All rights reserved.