Bluish-green color emitting Ba2Si3O8:Eu2+ ceramic phosphors for white light-emitting diodes

This paper reports on the structural and optical properties of Eu2+ activated Ba2Si3O8 ceramic phosphors synthesized by a sol-gel method. The ceramic phosphors have been characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and fluorescence measurements. The structural characterization results suggest that the as-prepared phosphors are of single phase monoclinic Ba2Si3O8 with rod-like morphology. A broad excitation band ranging from 300 to 410 nm matches well with the ultraviolet (UV) radiation of light-emitting diodes (LEDs). Upon 380 nm UV light excitation, these phosphors emit bluish-green emission centered at 500 nm with color coordination (x = 0.25, y = 0.40). All the obtained results indicate that the Ba2Si3O8:Eu2+ ceramic phosphors are promising bluish-green candidates for the phosphor-converted white LEDs. (C) 2009 Elsevier B.V. All rights reserved.