Abstract
Spherical-like Tb 3Al 5O 12:Ce (TAG:Ce) phosphor powders with good photoluminescence intensities were prepared by spray pyrolysis from a spray solution containing BaF 2 flux. The phosphor powders prepared from the spray solution without the BaF 2 flux had irregular morphologies and aggregated structure. On the other hand, the phosphor powders obtained from the spray solution containing a high amount of BaF 2 flux were spherical-like shapes, narrow size distributions and non-aggregation. All the powders comprised single-phase body-centered cubic Tb 3Al 5O 12 (TAG), irrespective of the addition amount of the BaF 2 flux. The maximum photoluminescence intensity of the TAG:Ce phosphor powders obtained from spray solutions containing BaF 2 was 140% that of the phosphor powders obtained from the spray solution without the flux material. The mean size of the TAG:Ce phosphor powders prepared from the spray solution containing 9 wt.% BaF 2 with respect to the phosphor was 1.02 μm after post-treatment at 1450 °C.
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