OXONITRIDE PHOSPHOR AND LUMINESCENT DEVICE USING THE OXONITRIDE PHOSPHOR

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An oxynitride phosphor represented by a general formula of L X M Y O Z N ((2/3)X+(4/3)Y-(2/3)Z) : R (L is Ba. M is Si. O is an oxygen element. N is a nitrogen element. R is Eu. 0.5 < X < 1.5, 1.5 < Y < 2.5, and 1.5 < Z < 2.5), the oxynitride phosphor having a crystal structure of the orthorhombic system, wherein the at least part of said L is substituted by said R in a molar ratio of (a mix amount of said L and said R) : (the amount of said R) = 1 : 0.01 to 1 : 0.05.