Abstract
Tb-doped Y2SiO5 (YSO:Tb) phosphor particles having a mean particle size of more than 2 µm and a narrow particle size distribution were prepared by spray pyrolysis using a two-fluid nozzle spray generator (marked SPs), and their crystallinity, photoluminescence (PL), and cathodeluminescence (CL) intensity were compared with those of YSO:Tb phosphor particles prepared using the sol–gel method (marked Sol-gel). It was found that non agglomerated precursor particles were formed by controlling the pyrolysis temperature and that the particle size distribution for SPs was much narrower than that for Sol-gel. In addition, the mean particle size of the SPs was changed by controlling the spray and carrier gas flow rates. An accurate X-ray diffraction Rietveld (XRD-Rietveld) analysis was successfully performed by using a cellulose resin; it was found that the crystallinity for SPs was as good as that for Sol-gel. The luminescence efficiency evaluated by the PL measurement for a certain condition of SPs (marked SP-2) was more or less the same as that for Sol-gel. On the other hand, the CL intensity for SP-2 was 15% higher than that for Sol-gel because of the former's uniformly and densely packed CL measurement plate arranged using phosphor particles having a narrow particle size distribution.
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