Mechanism of Particle Growth of a BaMgAl10O17:Eu2 Phosphor by Firing with AIF3

The mechanism of particle growth of the blue emitting BaMgAl10O17:Eu2 phosphor by firing with A1F3 has been clar-ified. It was found that the reaction between BaMgAI11O17:Eu2 and A1F3 during firing, on the basis of the following chem-ical equation, results in recreation of BaMgAl10O17:Eu *with particle growth BaMgAl10O17:Eu2 + (4/3)A1F3 BaMgF4:Eul * + (17/3)A1203 the firing of BaMgAl10O17:Eu2 with A1F3 first converts the phosphor into a mixture of the two compounds, BaMgF4:Eu2 and A1203, at around 1200°C. The BaMgF:Eu2 melts at temperatures over 1000°C, then reacts with A1203, and partici-pates in the recreation of both BaMgAl10O17:Eu2 and A1F3 through a chemical reaction between the two compounds at 1200°C in BaMgF4:Eu2 solutions. Recreated A1F3 appears to sublime immediately because it is a material which subli-mates with heating. This paper proposes a mechanism for the growth of particle of recreated BaMgAl10O17:Eu2 by the melting of BaMgF4:Eu2