RED EMITTING LUMINESCENT MATERIAL

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The invention relates to an improved red light emitting material of the formula M1−yA1+xSi4−xN7−x−2yOx+2y : RE whereby M is selected out of the group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected out of the group comprising Al, Ga, B or mixtures thereof, RE is selected out of the group comprising rare earth metals, Y, La, Sc or mixtures thereof and x is ≧0 and ≰1 and y is ≧0 and ≰0.2. This material is believed to crystallize in a novel structure type that comprises two individual lattice sites for rare earth metal incorporation, which leads to an improved lighting behaviour.