| US 7,573,190 B2 | ||
| Light emitting element and lighting instrument | ||
| Naoto Hirosaki, Tsukuba (Japan); Ken Sakuma, Tsukuba (Japan); Kyota Ueda, Tsukuba (Japan); and Hajime Yamamoto, Tsukuba (Japan) | ||
| Assigned to National Institute for Materials Science, Tsukuba-Shi, Ibaraki (Japan) | ||
| Appl. No. 10/588,007 PCT Filed Feb. 15, 2005, PCT No. PCT/JP2005/002675 § 371(c)(1), (2), (4) Date Aug. 17, 2006, PCT Pub. No. WO2005/078811, PCT Pub. Date Aug. 25, 2005. |
||
| Claims priority of application No. 2004-041502 (JP), filed on Feb. 18, 2004. | ||
| Prior Publication US 2007/0159091 A1, Jul. 12, 2007 | ||
| Int. Cl. H01J 1/62 (2006.01); C09K 11/66 (2006.01) | ||
| U.S. Cl. 313—503 [252/301.4 F] | 14 Claims |
| 1. A visible light emitting device, comprising at least:
a semiconductor light emitting element configured to emit bluish purple or blue light;
a support member formed with a depression for placing said semiconductor light emitting element therein, said depression constituted
as a visible wavelength light reflective surface;
terminals configured to supply electric power to said semiconductor light emitting element; and
a phosphor configured to absorb a part or the whole of light emitted from said light emitting element, and to emit fluorescence
at a wavelength different from that of the absorbed light, the phosphor including X % of a first fluorescent material configured
to emit green, yellowish green, or yellow light, and Y % of a second fluorescent material configured to emit yellowish red
or red light, at a mixing ratio meeting a condition of 0≤X<100, 0<Y≤100, and 0<X+Y≤100,
wherein said second fluorescent material comprises a CaAlSiN3 crystal phase including, dissolved therein in a solid state, one or more element(s) selected from Mn, Ce, Pr, Nd, Sm, Eu,
Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
|