Ba_0.79Al_10.9O_17.14:Eu^2＋新蛍光体材料の合成と発光特性

抄録

We attempted to use the Ba_0.79Al_10.9O_17.14 as a host material for a new phosphor. Doping of Eu^2＋ was achieved by annealing the Eu₂O₃-containing materials under 97％ Ar - 3％ H₂ reductive atmosphere. The phosphors of （Ba_1-xEu_x)_0.79Al_10.9O_17.14 were synthesized with the x-values ranging from 0.05 to 0.16 to determine the Eu^2＋ ion concentration for highest photoluminescence （PL） intensity. The phosphors emitted the blight blue-green-color, in which the broad emission spectrum was observed in the wave range of 450～550 nm when excited by ultraviolet light at around 329 nm. One of the phosphors with x=0.1 showed the highest PL intensity. TEM images of the specimens with x-values of 0 and 0.12 were observed and the composition of each grain was measured by EDS. The results showed that the hexagonal structure has an antiphase-domain boundaries along the ［100］ direction and the PL intensity is closely related to crystal structure.