Phosphor

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A phosphor is provided. The phosphor includes a composition represented by the formula : M1O2.aM2O.bM3X2 : M4, where M1 is at least one element selected from the group consisting of Si, Ge, Ti, Zr, and Sn; M2 is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn; M3 is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn; X is at least one halogen element; M4 is at least one element essentially including Eu2+ selected from the group consisting of rare-earth elements and Mn; a is in the range of 0.1≰a≰1.3; and b is in the range of 0.1≰b≰0.25.