Light emitting device
First Claim
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1. A white light emitting device comprising:
- a light emitting element, a first fluorescent substance having a peak wavelength in a range from 575 nm to 630 nm, a second fluorescent substance capable of emitting a light in a range from blue to red, said second fluorescent substance being different from the first fluorescent substance.
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Abstract
To minimize the variability in the emitted light color and improve the unevenness of color tone, a light emitting device comprises a light emitting element and a fluorescent substance that is excited by the light emitting element, wherein the light emitting element has an emission spectrum in a region from ultraviolet to visible light of short wavelengths, and the fluorescent substance has an emission spectrum that includes two or more emission peaks with at least two peaks of the two or more peaks being in the relation of complementary colors of each other.
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Citations
23 Claims
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1. A white light emitting device comprising:
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a light emitting element, a first fluorescent substance having a peak wavelength in a range from 575 nm to 630 nm, a second fluorescent substance capable of emitting a light in a range from blue to red, said second fluorescent substance being different from the first fluorescent substance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fluorescent substance represented by M11-a-bEuaL1b)10 (PO4)6Q2, where M1 represents at least one kind of element selected from the group consisting of Mg, Ca, Ba, Sr and Zn, L1 represents at least one kind of element selected from the group consisting of Mn, Fe, Cr and Sn, and Q represents at least one kind of element selected from the group consisting of F, Cl, Br and I, where 0.0001≦
- a≦
0.5 and 0.0001≦
b≦
0.5, the fluorescent substance capable of being excited a light having a wavelength in a range from 340 nm to visible light of short wavelength. - View Dependent Claims (9, 10, 11, 12, 13)
- a≦
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14. A light device comprising;
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a light emitting element which emits a light having a wavelength in a range from 340 nm to visible light of short wavelength, a fluorescent substance represented by (M11-a-bEuaL1b)10(PO4)6Q2, where M1 represents at least one kind of element selected from the group consisting of Mg, Ca, Ba, Sr and Zn, L1 represents at least one kind of element selected from the group consisting of Mn, Fe, Cr and Sn, and Q represents at least one kind of element selected from the group consisting of F, Cl, Br and I, where 0.0001≦
a≦
0.5 and 0.0001≦
b≦
0.5,wherein the fluorescent substance is excited by the light outputted from the light emitting element. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification