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US 2011/0031874 A1Published application
Light emitting apparatus
AssigneeNichia Corporation
InventorsShoji Hosokawa, Hiroto Tamaki
Life of this patent
Estimating the term…
Abstract
A red nitride phosphor of formula (I) or (II), and two green phosphors of formulas (III) and/or (IV) are included. MwAlxSiyBzN((2/3)w+x+(4/3)y+z):Eu2+ (I) M is any of Mg, Ca, Sr and Ba, and 0.5≦w≦3, x=1, 0.5≦y≦3 and 0≦z≦0.5, MpSiqN((2/3)p+(4/3)q):EU2+ (II) 1.5≦p≦2.5 and 4.5≦q≦5.5, MxMgSizOaXb:Eu2+ (III) M is any of Ca, Sr, Ba, Zn and Mn, X is any of F, Cl, Br and I, and 6.5≦x≦8.0, 3.7≦z≦4.3, a=x+1+2z−b/2 and 1.0≦b≦1.9, SicAldOfNg:Eu2+ (IV) c+d=6, 5.0≦c<6, 0<d≦1.0, 0.001<f≦1, 7≦g<8.
Claims10
A light emitting apparatus comprising:
- a light emitting device that can emit a light component, and
- three or more types of phosphors that can be excited by the light component emitted from said light emitting device to emit visible light components with wavelengths different from the wavelength of the light component emitted from said light emitting device, wherein three or more types of phosphors include
- a red luminescent type phosphor containing at least one type of nitride phosphor selected from the group consisting of phosphors of the following general formulas (I) and (II), and
- at least two types of green luminescent type phosphors selected from the group consisting of phosphors of the following general formulas (III) and (IV), wherein
- said at least two types of green luminescent type phosphors have peak wavelengths in a range of not less than 529 to not more than 535 nm, wherein
- a phosphor group is included that consists of phosphor types having an absolute specific gravity in a range of not less than 3.00 to not more than 4.30 among said three or more types of phosphors, and the difference between the absolute specific gravity of each phosphor type in said phosphor group and the mean absolute specific gravity of the phosphor types in said phosphor group falls within a range of ±16% of the mean absolute specific gravity of the phosphor types in said phosphor group, wherein the content of the phosphor types in said phosphor group is not less than 90% by weight of said three or more types of phosphors
- MwAlxSiyBzN(2/3)w+x+(4/3)y+z):Eu2+ (I)
- where M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and 0.5≦w≦3, x=1, 0.5≦y≦3 and 0≦z≦0.5,
- MpSqN((2/3)p+(4/3)q):Eu2+ (II)
- where M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and 1.5≦p≦2.5 and 4.5≦q≦5.5,
- MxMgSizOaXb:Eu2+ (III)
- where M is at least one element selected from the group consisting of Ca, Sr, Ba, Zn and Mn, X is at least one element selected from the group consisting of F, Cl, Br and I, and 6.5≦x≦8.0, 3.7≦z≦4.3, a=x+1+2z−b/2 and 1.0≦b≦1.9,
- SicAldOfNg:Eu2+ (IV)
- where c+d=6, 5.0≦c<6, 0<d≦1.0, 0.001<f≦1, 7≦g<8.
11 more elements
Dependencies are inferred from the claim text.