| abstract |
A light bulb color light emitting diode lamp comprising a semiconductor blue light emitting diode element (5) having a light emission central wavelength of 400nm-480nm, and fluorescent substances (11) that absorb part of light emitted from this and emit fluorescence different in wavelength from this light. The fluorescent substances (11) is expressed by a general formula M p(Si, Al)12(O, N)16:Eu2+q, and its principle phase has an alpha-sialon structure. M is at least one of Ca, Y, Mg, Li, Sc, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr, and 0.75≤p≤1.0 and 0.02<q<0.09 are satisfied. The chromaticity of light from this diode lamp falls within the range of a light bulb color represented by a quadrangle formed by connecting four points given by, on the XYZ colorimetric system chromaticity diagram coordinates, x=0.4775, y=0.4283; x=0.4594, y=0.3971; x=0.4348, y=0.4185; x=0.4214, y=0.3887. |