Luminescent Properties of Ca-α-SiAlON:Eu[sup 2+] Phosphors Synthesized by Gas-Pressured Sintering

Rare-earth-doped oxynitride or nitride compounds have been reported to be photoluminescent and may then serve as new phosphors with good thermal and chemical stabilities. In this work, based yellow and orange oxynitride phosphors with compositions of and were prepared using the gas-pressured sintering method. The crystallinity and particle morphology of the prepared phosphors were characterized. The temperature dependence of photoluminescence properties was investigated from 25 to . The Stokes shift and zero-phonon line was calculated mathematically and estimated from the spectral data. The prepared phosphors showed superior thermal quenching properties compared to commercially used phosphors. In addition, the activation energies for thermal quenching of the prepared phosphors were determined by Arrhenius fitting.