FLUORESCENT BODY AND LIGHT-EMITTING DEVICE USING SAME

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This fluorescent body comprises a host material having boron, nitrogen and oxygen as principal components thereof, and to which a rare-earth element is added, wherein the composition formula thereof is B(l)O(m)N(n) : Z. Herein, B represents boron, O represents oxygen, N represents nitrogen, and Z represents the rare-earth element. In addition, l, m and n represent respective element contents.