RED EMITTING LUMINESCENT MATERIALS

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The invention relates to an improved red light emitting material of the formula M 1-y A 1+x Si 4-x N7-x-2y O x+2y : REwhereby 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 =0 and COPYRIGHT KIPO & WIPO 2010