| 摘要 |
To provide a phosphor having an emission spectrum with a broad peak in a range from green color to yellow color, having a broad and flat excitation band capable of using lights of broad range from near ultraviolet/ultraviolet to blue lights as excitation lights, and having excellent emission efficiency and luminance. The problem is solved by providing the phosphor expressed by a general composition formula MmAaBbOoNn:Z (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of elements acting as the activator.), satisfying 4.0 < (a + b)/m < 7.0, a/m = 0.5, b/a > 2.5, n > o, n = 2/3m + a + 4/3b - 2/3o, and having an emission spectrum with a peak wavelength of 500nm to 650nm when excited by light in a wavelength range from 300nm to 500nm. |
