Red luminescence and ferromagnetism in europium oxynitridosilicates with a β-K2SO4 structure

Abstract

The new compounds LaSrSiO₃N and LaBaSiO₃N activated with Eu²⁺ are orange-red light-emitting luminescent materials under excitation in the UV-blue range. They represent the first examples of stoichiometric alkaline earth oxynitridosilicates with a β-K₂SO₄ structure. The isostructural compound LaEuSiO₃N is ferromagnetic with a Curie temperature of 3 K and also shows red luminescence (λ_max = 705 nm) under excitation at 405 nm.