| 1. A phosphor emitting a light when a monochromatic excitation light in a range from 250 nm to 550 nm is irradiated thereon,
wherein a luminescence intensity at an excitation wavelength where an intensity of a spectrum of emitting the light by absorbing
the excitation light becomes maximum is defined as PH, a luminescence intensity at an excitation wavelength where the luminescence intensity becomes minimum is defined as PL, and PH/PL≤2, and the phosphor is represented by a composition formula MmAaBbOoNn:Z (note that the element M is one or more kind of
divalent elements, the element A is one or more kind of trivalent elements, the element B is one or more kind of tetravalent
elements, O is oxygen, N is nitrogen, and the element Z is an activator, satisfying o>O, n=2/3m+a+4/3b−2/3o).
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