| US 7,488,432 B2 | ||
| Fluorescent material and light-emitting device | ||
| Yoshinori Murazaki, Anan (Japan); Shinpei Kinoshita, Anan (Japan); Masatoshi Kameshima, Anan (Japan); Suguru Takashima, Anan (Japan); and Hiroto Tamaki, Anan (Japan) | ||
| Assigned to Nichia Corporation, Anan-shi (Japan) | ||
| Filed on Oct. 27, 2004, as Appl. No. 10/973,835. | ||
| Claims priority of application No. 2003-367159 (JP), filed on Oct. 28, 2003; and application No. 2004-124889 (JP), filed on Apr. 21, 2004. | ||
| Prior Publication US 2005/0212397 A1, Sep. 29, 2005 | ||
| Int. Cl. H01L 33/00 (2006.01); C09K 11/08 (2006.01) | ||
| U.S. Cl. 252—301.4R [252/301.6 S; 252/301.4 S; 252/301.4 F; 252/301.6 F] | 13 Claims |
| 1. A fluorescent material comprising a first phosphor that at least partially converts energy emitted by an excitation source,
which emits ultraviolet having a wavelength of about 365 nm, to a first emission spectrum that is different from the energy,
and a second phosphor that at least partially converts the first emission spectrum to a second emission spectrum that is different
from the first emission spectrum,
the first phosphor being a light-storing phosphor,
wherein the second phosphor is at least one type selected from the group consisting of
(YzGd1−z)3Al5O12:Ce, wherein z is a number that satisfies 0<z≤1, and
(A1−aSma)3A′5O12:Ce, wherein A is at least one type selected from the group consisting of Y, Lu, Sc, La, Gd, Pr and Tb, A′ is at least one
type selected from the group consisting of Al, Ga and In, and a is a number that satisfies 0≤a<1, and
a peak wavelength of the emission spectrum of the first phosphor and a peak wavelength of the emission spectrum of the second
phosphor have a relation of complementary colors so that when the light created due to the peak wavelength of the first phosphor
and the light created due to the peak wavelength of the second phosphor are mixed, the resulting light is in the white region.
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