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US 8,262,935 B2Granted
Phosphor and light emitting device
AssigneeKoito Manufacturing Co., Ltd.
InventorsHisayoshi Daicho, Takeshi Iwasaki, Kiminori Enomoto, Yu Shinomiya, Shinobu Aoyagi
Life of this patent
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Abstract
A phosphor includes a composition represented by the formula: (M2x, M3y, M4z)mM1O3X(2/n), wherein M1 is Si and may include at least one element selected Ge, Ti, Zr, and Sn; M2 is Ca and may include at least one element selected Mg, Ba, and Zn; M3 is Sr and may include at least one element selected from the group consisting of Mg, Ba, and Zn; X is at least one kind of halogen element; M4 is Eu2+ and may includes at least one element rare-earth elements and Mn, wherein m is in a range of 6/6≦m≦8/6; n is in a range of 5≦n≦7; and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01≦z≦0.3.
Claims6
A phosphor comprising a composition represented by the formula:
- (M2x,M3y,M4z)mM1O3X(2/n),
- wherein M1 is Si and optionally includes at least one element selected from the group consisting of Ge, Ti, Zr, and Sn;
- wherein M2 is Ca and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein M3 is Sr and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein X is at least one kind of halogen element;
- wherein M4 is Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn;
- wherein m is in a range of 6/6≦m≦8/6;
- n is in a range of 5≦n≦7;
- and x, y, and z satisfies x+y+z=1, where 0<x<1,0<y<1, and 0.01≦z≦0.3;
- and
- wherein the ionic radii of principal elements of M2, M3, and M4 satisfy M2<M3≅M4, and x, y, and z satisfies 0.50<x/(y+z)<0.8.
8 more elements
A phosphor comprising a composition represented by the formula:
- (M2,M3y,M4z)mM1O3X(2/n),
- wherein M1 is Si and optionally includes at least one element selected from the group consisting of Ge, Ti, Zr, and Sn;
- wherein M2 is Ca and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein M3 is Sr and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein X is at least one kind of halogen element;
- wherein M4 is Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn;
- wherein m is in a range of 6/6≦m≦8/6;
- n is in a range of 5≦n≦7;
- and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01≦z≦0.3;
- and
- wherein a principal halogen element of X is Cl, and a ratio XBr of Br in the halogen element X satisfies 0.1<XBr<0.3.
8 more elements
A light emitting device comprising:
- a light emitting element that emits ultraviolet light or short-wavelength visible light;
- a first phosphor that is excited by the ultraviolet light or short-wavelength visible light to emit first visible light;
- and
- a second phosphor that is excited by the ultraviolet light or short-wavelength visible light to emit second visible light, wherein the colors of the first visible light and the second visible light complement each other, and white light is obtained by adding and mixing the colors of the first visible light and the second visible light,
- wherein the first phosphor comprises a composition represented by the formula:
- (M2x,M3y, M4z)mM1O3X(2/n),
- wherein M1 is Si and optionally includes at least one element selected from the group consisting of Ge, Ti, Zr, and Sn;
- wherein M2 is Ca and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein M3 is Sr and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn, provided that M3 essentially includes Sr;
- wherein X is at least one kind of halogen element;
- wherein M4 is Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn,
- wherein m is in a range of 6/6≦m≦8/6;
- n is in a range of 5≦n≦7;
- and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01≦z≦0.3, and
- wherein the ionic radii of principal elements of M2, M3, and M4 satisfy M2<M3≅M4, and x, y, and z satisfies 0.50<x/(y+z)<0.8.
12 more elements
A phosphor comprising a composition represented by the formula:
- (M2x,M3y,M4z)mM1O3X(2/n),
- wherein M1 is Si and optionally includes at least one element selected from the group consisting of Ge, Ti, Zr, and Sn;
- wherein M2 is at least one element selected from the group of Ca and Sr and optionally includes at least one kind of element selected from the group consisting of Ca Mg, Ba, Sr and Zn;
- wherein M3 is Sr and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein X is at least one kind of halogen element;
- wherein M4 is Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn,
- wherein m is in a range of 6/6≦m≦8/6;
- n is in a range of 5≦n≦7;
- and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01≦z≦0.3 and
- wherein the ionic radii of principal elements of M2, M3, and M4 satisfy M2<M3≅M4, and x, y, and z satisfies 0.50<x/(y+z)<0.8.
7 more elements
A light emitting device comprising:
- a light emitting element that emits ultraviolet light or short-wavelength visible light;
- a first phosphor that is excited by the ultraviolet light or short-wavelength visible light to emit first visible light;
- and
- a second phosphor that is excited by the ultraviolet light or short-wavelength visible light to emit second visible light, wherein the colors of the first visible light and the second visible light complement each other, and white light is obtained by adding and mixing the colors of the first visible light and the second visible light,
- wherein the first phosphor comprises a composition represented by the formula:
- (M2x,M3y,M4z)mM1O3X(2/n)
- wherein M1 is Si and optionally includes at least one element selected from the group consisting of Ge, Ti, Zr, and Sn;
- wherein M2 is Ca and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein M3 is Sr and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn, provided that M3 essentially includes Sr;
- wherein X is at least one kind of halogen element;
- wherein M4 is Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn,
- wherein m is in a range of 6/6≦m≦8/6;
- n is in a range of 5≦n≦7;
- and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01≦z≦0.3, and
- wherein a principal halogen element of X is Cl, and a ratio XBr of Br in the halogen element X satisfies 0.1<XBr<0.3.
12 more elements
A phosphor comprising a composition represented by the formula:
- (M2x,M3y,M4z)mM1O3X(2/n),
- wherein M1 is Si and optionally includes at least one element selected from the group consisting of Ge, Ti, Zr, and Sn;
- wherein M2 is at least one element selected from the group of Ca and Sr and optionally includes at least one kind of element selected from the group consisting of Ca Mg, Ba, Sr and Zn;
- wherein M3 is Sr and optionally includes at least one kind of element selected from the group consisting of Mg, Ba, and Zn;
- wherein X is at least one kind of halogen element;
- wherein M4 is Eu2+ and optionally includes at least one element selected from the group consisting of rare-earth elements and Mn,
- wherein m is in a range of 6/6≦m≦8/6;
- n is in a range of 5≦n≦7;
- and x, y, and z satisfies x+y+z=1, where 0<x<1, 0<y<1, and 0.01≦z≦0.3, and
- wherein a principal halogen element of X is Cl, and a ratio XBr of Br in the halogen element X satisfies 0.1<XBr<0.3.
7 more elements
Dependencies are inferred from the claim text.