| US 7,597,821 B2 | ||
| Oxynitride phosphor and a light emitting device | ||
| Ken Sakuma, Sakura (Japan); Naoki Kimura, Sakura (Japan); and Naoto Hirosaki, Tsukuba (Japan) | ||
| Assigned to Fujikura Ltd., Tokyo (Japan); and National Institute For Materials Science, Ibaraki (Japan) | ||
| Filed on Aug. 29, 2005, as Appl. No. 11/212,559. | ||
| Claims priority of application No. P2004-250468 (JP), filed on Aug. 30, 2004. | ||
| Prior Publication US 2007/0246732 A1, Oct. 25, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H01L 33/00 (2006.01) | ||
| U.S. Cl. 252—301.4F [313/503; 257/98] | 14 Claims |
| 1. An oxynitride phosphor represented by a general formula of (Ca1-zYz)x(Si, Al)12(O, N)16:Eu2+y,
wherein a main phase thereof has substantially an alpha SiAlON crystal structure; the value z is larger than 0 and smaller
than 0.15;
the value x is from 0.75 to 1.00; and
the value y is from 0.03 to 0.08.
|