Phosphors and white light emitting devices including same

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A phosphor represented by Formula 1 : [in-line-formulae](A1−(a+b)EuaLnb)1−x(B1−cMnc)2Al(6+b−2x)Si(9−b+2x)O30  Formula 1[/in-line-formulae] wherein A includes at least one element selected from the group consisting of Ca, Sr and Ba, Ln includes at least one metal selected from the group consisting of a trivalent rare earth metal, B includes at least one element selected from the group consisting of Mg, Zn, Ge and Co, a is greater than 0 and equal to or less than about 0.5, b is greater than 0 and equal to or less than about 0.25, c is greater than 0 and less than about 0.8, and x is 0 to about 0.2. Also a white light emitting device including the phosphor.