Luminescent materials

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Embodiments of the invention are directed to a luminescent ceramic including a first phase and a second phase. The first phase is R3−x−y−z+w2A1.5x+y−w2MzSi6−w1−w2Alw1−w2N11−y−w1Oy+w1. R is selected from the group comprising trivalent La, Gd, Tb, Y, Lu; A is selected from the group comprising bivalent Ca, Mg, Sr, Ba, and Eu; and M is selected from the group comprising trivalent Ce, Pr and Sm. The second phase may be or comprise, for example, RE3ASi5N9O2 and RESi3N5, wherein RE is at least one rare-earth element selected from the group consisting of La, Gd, Lu, Y, Ce and Sc and wherein A is at least one metal element selected from the group consisting of Ba, Sr, Ca, Mg, Zn and Eu.