Synthesis and Luminescence Properties of Amber Emitting La Sr[Si N O ] : Eu and Syntheses of the Substitutional Variants RE AE [Si N O ] : Eu with RE=La, Ce; AE=Ca, Sr, Ba; 0≤x≤2.

The oxonitridosilicate La Sr[Si N O ] : Eu and its substitutional variants RE AE [Si N O ] : Eu with RE=La, Ce; AE=Ca, Sr, Ba and 0≤x≤2 were synthesized starting from REN, SrN/Ca N /Ba N, SiO , amorphous Si N and Eu O as doping agent at 1600 °C in a radiofrequency furnace. The crystal structure of La Sr[Si N O ] was solved and refined based on single-crystal X-ray diffraction data. La Sr[Si N O ] crystallizes in the orthorhombic space group Pmn2 (no. 31). The crystal structures of the isotypic compounds RE AE [Si N O ] were confirmed by Rietveld refinements based on powder X-ray diffraction data using the single-crystal data of La Sr[Si N O ] as starting point. Crystal structure elucidation reveals a 3D network of vertex sharing SiN and SiN (N O ) (0≤x≤2) tetrahedra. When excited with UV to blue light, La Sr[Si N O ] : Eu shows amber luminescence with λ =612 nm and fwhm=84 nm/2194 cm , which makes it interesting for application in amber phosphor-converted light emitting diodes.