Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 515, Issue -, Pages 16-19Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.11.114
Keywords
Phosphors; Solid state reactions; Optical properties; Luminescence
Categories
Funding
- National Natural Science Foundation of China [50902042]
- Science and Technology Project of Hebei Province [F2009000217]
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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.
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