| abstract |
To provide a phosphor having a broad emission spectrum in a range of blue color (in a peak wavelength range from 400nm to 500nm), having a broad flat excitation band in a near ultraviolet/ultraviolet range, and having excellent emission efficiency and emission intensity/luminance. The phosphor is given as a general composition formula expressed by MmAaBbOoNn:Z, (where element M is the element having bivalent valency, element A is the element having tervalent valency, element B is the element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is more than one kind of element acting as an activator.), satisfying 5.0 < (a + b)/m < 9.0, 0 a/m 2.0, 0 o < n, n = 2/3m + a + 4/3b - 2/3o, and has an emission spectrum with a maximum peak in the wavelength range from 400 nm to 500 nm under an excitation of the light in a wavelength range from 250 nm to 430 nm. |