Multiwavelength excited white-emitting phosphor Dy3+-activated Ba3Bi(PO4)3

Dy3+-activated Ba3Bi(PO4)(3) multiwavelength excited warm white emitting phosphors were synthesized via a solid state reaction at 1250 degrees C. The structure and photoluminescence characteristics were investigated by X-ray powder diffraction (XRD) and fluorescent spectrophotometry, respectively. The excitation spectra included some bands located at 348.2, 362.6, 386.8 and 452.4 nm which match the radiations of near-UV or blue light-emitting diodes chip well. Upon excitation either of near-UV or blue even green light, the intense blue and yellow emissions with 481.6 (487) and 575 nm peaks can be observed, which is ascribed to the F-4(9/2)-H-6(15/2), F-4(9/2)-H-6(13/2) transitions of Dy3+ ions. The chromaticity coordinates (x = 0.322, y = 0.381) of the as-obtained phosphor is very close to the "ideal white" (x = 0.333, y = 0.333) in chromaticity diagram. All these characteristics suggest that Dy3+-doped Ba3Bi(PO4)(3) wavelength-conversion material to be suitable candidate warm white component for phosphor converted white light-emitting diodes. (C) 2011 Elsevier B. V. All rights reserved.