Photoluminescence and LED application of β-SiAlON:Eu2+ green phosphor

We successfully prepared β-SiAlON:Eu2+ phosphors with composition of EuxSi6−zAlzOyN8−y (y = z − 2x, x = 0.018, z = 0.23) by gas-pressured synthesis for application to LED. The crystal phase, microstructure, PL emission and thermal quenching properties were investigated in detail. The β-SiAlON:Eu2+ phosphors absorbed broad UV–vis spectral region, and showed a single intense broadband emission near 538 nm. The Stokes shift and zero-phonon line were calculated mathematically, and also estimated from the spectral data. The β-SiAlON:Eu2+ green phosphor showed superior thermal quenching properties compared to commercial silicate (SrBaSiO4:Eu2+) green phosphor. The white light-emitting diode (LED) using the prepared β-SiAlON:Eu2+ green phosphor exhibited high color gamut, and good optical stability in high working temperature.