Sr2-xEuxSiO4 powders were prepared by a flux method, and then a correlation between a phase transition and luminescent properties were investigated. The β↔α' transition depended on the synthesizing conditions such as firing temperature, duration time, and europium concentration, resulting in a change of luminescence. Eu2+ ions contributed to the stabilization of the α'-form even at room temperature, which led to a decrease of the β/α' phase ratio with an increase of the Eu2+ concentration. The β-form exhibited a higher PL intensity and a blue-shift compared with the α'-form.

Keywords: Strontium silicate, Solid-state reaction, Phase transition, Luminescence.