Fine-sized Y3Al5O12:Ce phosphor powders prepared by spray pyrolysis from the spray solution with barium fluoride flux

YAG:Ce phosphor powders were prepared by spray pyrolysis from the spray solutions with BaF2 flux. BaF2 flux improved the morphological and optical properties of the YAG:Ce phosphor powders. The powders prepared from the spray solution with 9 wt.% BaF2 flux had regular morphology and non-aggregation characteristic. The mean size of the YAG:Ce phosphor powders was 1.73 mu m. The prepared YAG:Ce phosphor powders had broad emission spectra between 500 and 670 nm, with maximum peak intensity at 537 nm irrespective of the amount of BaF2 flux added to the spray solutions. The YAG:Ce phosphor powders prepared from the spray solution with 9 wt.% BaF2 flux had the maximum photoluminescence intensity. The maximum peak intensity of the prepared YAG:Ce phosphor powders was 108% of that of the commercial phosphor powders. The white LED with prepared YAG:Ce phosphor powders showed (0.3643, 0.4248) on the CIE chromaticity diagram, and about 62.8 of Ra. The luminous intensity of the white LED was 2.21 cd. (C) 2008 Elsevier B.V. All rights reserved.