Synthesis, crystal structure and photoluminescence of a new Eu-doped Sr containing sialon (Sr0.94Eu0.06)(Al0.3Si0.7)4(N0.8O0.2)6

► A new compound Eu2+-doped (Sr0.94Eu0.06)(Al0.3Si0.7)4(N0.8O0.2)6 was prepared. ► Stacking faults in the compound were clarified by electron and X-ray diffraction. ► A basic crystal structure model was obtained based on the X-ray diffraction data. ► An emission of 490 nm under 334 nm excitation at room temperature was observed.