Synthesis and photoluminescence properties of novel BASI4O6N2:EU2+ phosphor

Using Eu₂O₃, BaCO₃, Si₃N₄ and SiO₂ as starting materials, we succeeded in synthesizing BaSi₄O₆N₂:Eu${}^{2+}$ by firing the mixture at 1100^∘C for 2$$h in a reducing atmosphere (N₂(95%)–H₂(5%)). As a result, a single phase was obtained by setting the charge composition ratio to Si/$\mathrm{\text{Ba}}=6$. When the Eu${}^{2+}$ activation amount was 1%, it showed a broad emission in the range of 400–600$$nm under the excitation light of ultraviolet rays at 320$$nm. This phosphor exhibited chromaticity coordinates of $(x,y)=(0.258,0.297)$ under irradiation with ultraviolet rays at 320$$nm and is thought to be a promising phosphor for ultraviolet-excited white LEDs.