| abstract |
The present invention provides an oxynitride phosphor having a higher external quantum efficiency than an oxynitride phosphor having a peak wavelength of 580 to 605 nm. The oxynitride phosphor powder of the present invention is represented by the following composition formula, and comprises an oxynitride phosphor of α-type lanthanum oxynitride and aluminum nitride, and has a composition formula of Cax1Eux2Si12-(y+z)Al ( y+z)OzN16-z (wherein, x1, x2, y, z are 0<x1≦2.50, 0.01≦x2≦0.20, 0<y≦2.3 and 1.5≦z≦3.5; or, x1, x2 , y, z are 0<x1≦2.70, 0.05≦x2≦0.20, 2.3≦y≦5.5, and 1≦z≦2.5). Further, the present invention provides a method for producing the above oxynitride phosphor. |