The phosphor and a light emitting device

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A phosphor includes a composition represented by the formula : (M 2 x , M 3 y , M 4 z ) m M 1 O 3 X (2/n) , wherein M 1 is Si and may include at least one element selected Ge, Ti, Zr, and Sn; M 2 is Ca and may include at least one element selected Mg, Ba, and Zn; M 3 is Sr and may include at least one element selected from the group consisting of Mg, Ba, and. Zn; X is at least one kind of halogen element; M 4 is Eu 2+ and may includes at least one element rare-earth elements and Mn, wherein m is in a range of 6/6 ‰¤ m ‰¤ 8/6; n is in a range of 5 ‰¤ n ‰¤ 7; and x, y, and z satisfies x + y + z = 1, where 0 < x < 1, 0 < y < 1, and 0.01 ‰¤ z ‰¤ 0.3.