Abstract
Y 2O 3:Eu phosphors were prepared by a spray pyrolysis process followed by post annealing. Morphology control of Y 2O 3:Eu phosphor particles in the spray pyrolysis process was attempted by using citric acid (CA) and polyethylene glycol (PEG) as additives in the spray precursors. Three different morphologies of Y 2O 3:Eu phosphor particles, viz. smooth spheres, rods and flakes, were obtained in the presence of PEG with different molecular weights or without the presence of PEG, respectively. Possible mechanisms for the formation of Y 2O 3:Eu particles with the different morphologies have been proposed. It is shown that the spherical Y 2O 3:Eu phosphors have higher photoluminescent intensity than those with other morphologies.
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