Shock synthesis of Sr2Si5N8:Eu2+ phosphor

Abstract A new approach to synthesise the red-emitting nitridosilicate phosphor Sr 2 Si 5 N 8 : Eu 2 + using shock waves is described. The solid state reaction of a mixture of Si 3 N 4 , Sr 3 N 2 and EuN was induced using a detonation-driven shock wave apparatus. The obtained products consist of Sr 2 Si 5 N 8 : Eu 2 + with a purity of 80–89%, containing 7–9% of SrSi 7 N 10 and 4–11% α − Si 3 N 4 , according to Rietveld analyses. Crystallites with sizes of 240–310 nm are formed, yielding particles of 2–3 μm grain size. The luminescence properties are similar to conventionally produced Sr 2 Si 5 N 8 : Eu 2 + phosphors.