Synthesis of Eu x Si6-z Al z O z N8-z green phosphor and its luminescent properties

Rare-earth-doped oxynitride or nitride compounds have been reported to be photoluminescent and may then serve as new phosphors because of their good thermal and chemical stabilities. In this work, Eu2+-doped beta-SiAlON phosphor with a composition of Eu (x) Si6-z Al (z) O (z) N8-z (x=0.018, z=0.23) was prepared by gas-pressured solid state reaction. The crystallinity and particle morphology of the prepared phosphor were characterized. The Stokes shift and zero-phonon line were calculated mathematically and estimated from the spectral data. The temperature dependence of photoluminescence was measured from 25 to 250A degrees C. The prepared Eu2+-doped beta-SiAlON green phosphor showed superior thermal quenching property compared to silicate (SrBaSiO4:Eu2+) green phosphor. The white light-emitting diode (LED) back-lighting unit (BLU) using the prepared beta-SiAlON:Eu2+ green phosphor exhibited higher color gamut than a commercial silicate phosphor.