Synthesis and photoluminescence properties of novel BASI4O6N2:EU2+ phosphor

Using Eu2O3, BaCO3, Si3N4 and SiO2 as starting materials, we succeeded in synthesizing BaSi4O6N2:Eu2+ by firing the mixture at 1100(degrees)C for 2h in a reducing atmosphere (N-2(95%)-H-2(5%)). As a result, a single phase was obtained by setting the charge composition ratio to Si/Ba=6. When the Eu(2+ )activation amount was 1%, it showed a broad emission in the range of 400-600nm under the excitation light of ultraviolet rays at 320nm. This phosphor exhibited chromaticity coordinates of (x,y)=(0.258,0.297) under irradiation with ultraviolet rays at 320nm and is thought to be a promising phosphor for ultraviolet-excited white LEDs.