Preparation of (Sr0.5Ba0.5)Si2N 2O2: Eu2+ phosphor and its luminescence properties

Abstract

Eu2+ ion-doped oxynitride phosphor, (Sr0.5Ba 0.5)Si2O2- N2:Eu2+, was prepared by solid-state reaction using metal alloy as precursor. Owing to the relatively high activity of the metal alloy precursor compared with the inert Si3N4, a single phase of solid solution phosphor (Sr 0.5Ba0.5)Si2O2N2:Eu 2+ was easily obtained at 1400 °C under atmospheric pressure. It showed a broad excitation band originating from the 4f7 → 4f65d transition of Eu2+ ion, extending to 520 nm, and centering at 460nm and a strong emission band peaking at 565 nm. The high emission and small thermal quenching allow this material to be used for phosphor-converted white LEDs. © 2011 The Chemical Society of Japan.