White light source and white light source system including the same
First Claim
Patent Images
1. A white light source comprising a blue light emitting LED having a light emission peak of 421 to 490 nm and a phosphor excited by the blue light emitting LED thereby to emit a white light,wherein the phosphor comprises four or more types of phosphors having different peak wavelengths, and at least one of the phosphor is a blue-green phosphor having a peak wavelength of 480 to 500 nm, and the white light source satisfies a relational equation of
−
- 0.2≦
[(P(λ
)×
V(λ
))/(P(λ
max1)×
V(λ
max1))−
(B(λ
)×
V(λ
))/(B(λ
max2)×
V(λ
max2))]≦
+0.2.
assuming that;
a light emission spectrum of the white light source is P(λ
);
a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ
);
a spectrum of a spectral luminous efficiency is V(λ
);
a wavelength at which P(λ
)×
V(λ
) becomes largest is λ
max1; and
a wavelength at which B(λ
)×
V(λ
) becomes largest is λ
max2.
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Abstract
The present invention provides a white light source comprising a blue light emitting LED having a light emission peak of 421 to 490 nm and satisfying a relational equation of
−0.2≦[(P(λ)×V(λ))/(P(λmax1)×V(λmax1))−(B(λ)×V(λ))/(B(λmax2)×V(λmax2))]≦+0.2,
- assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ)×V(λ) becomes largest is λmax1; and a wavelength at which B(λ)×V(λ) becomes largest is λmax2. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.
-
Citations
10 Claims
-
1. A white light source comprising a blue light emitting LED having a light emission peak of 421 to 490 nm and a phosphor excited by the blue light emitting LED thereby to emit a white light,
wherein the phosphor comprises four or more types of phosphors having different peak wavelengths, and at least one of the phosphor is a blue-green phosphor having a peak wavelength of 480 to 500 nm, and the white light source satisfies a relational equation of
−- 0.2≦
[(P(λ
)×
V(λ
))/(P(λ
max1)×
V(λ
max1))−
(B(λ
)×
V(λ
))/(B(λ
max2)×
V(λ
max2))]≦
+0.2.
assuming that;
a light emission spectrum of the white light source is P(λ
);
a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ
);
a spectrum of a spectral luminous efficiency is V(λ
);
a wavelength at which P(λ
)×
V(λ
) becomes largest is λ
max1; and
a wavelength at which B(λ
)×
V(λ
) becomes largest is λ
max2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- 0.2≦
Specification
-
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Current AssigneeSeoul Semiconductor Co., Ltd.
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
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InventorsYamakawa, Masahiko, Shirakawa, Yasuhiro
-
Primary Examiner(s)Guharay, Karabi
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Assistant Examiner(s)Snyder, Zachary J
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Application NumberUS14/110,830Publication NumberTime in Patent Office1,517 DaysField of SearchUS Class Current1/1CPC Class CodesF21K 9/23 Retrofit light sources for ...F21Y 2113/13 comprising an assembly of p...F21Y 2113/17 forming a single encapsulat...F21Y 2115/10 Light-emitting diodes [LED]H01L 25/0753 the devices being arranged ...H01L 2924/00 Indexing scheme for arrange...H01L 2924/0002 Not covered by any one of g...H01L 33/504 Elements with two or more w...H05B 45/00 Circuit arrangements for op...H05B 45/20 Controlling the colour of t...
