Teruaki Shigeta

Firing technique for preparing a BaMgAl10O17:Eu2+ phosphor with controlled particle shape and size

The effects of firing temperature on the crystallinity and the luminescent properties of BaMgAl 10 O 17 :Eu 2+ phosphor have been investigated over the temperature range 1000-1800°C under preparative conditions which do not use any flux such as AlF 3 . The effects of particle shape and size of the ingredient Al 2 O 3 on the phosphor have also been studied under a preparative condition which has a firing temperature of 1700°C and does not use any flux. A single-phase BaMgAl 10 O 17 :Eu 2+ with sufficient luminescent properties can be obtained over a firing temperature range of 1600-1800°C through formation of the intermediate product BaAl 2 O 4 :Eu 2+ . Furthermore, the particle shape and size of the ingredient Al 2 O 3 determine the particle shape and size of BaMgAl 10 O 17 :Eu 2+ . High-temperature firing in the absence of any flux has provided for the preparation of a single-phase BaMgAl 10 O 17 :Eu 2+ with various particle shapes, such as spherical or platelike, and particle sizes ranging from 2 to 18 μm.