Phosphor converted light emitting device
DCFirst Claim
1. A device comprising:
- a semiconductor light emitting device capable of emitting light of a first wavelength; and
a first wavelength-converting material comprising Sr—
SiON;
Eu2+, the first wavelength-converting material disposed to absorb light of the first wavelength;
wherein the first wavelength-converting material absorbs light of the first wavelength and emits light of a second wavelength longer than the first wavelength.
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Abstract
A device includes a semiconductor light emitting device and a wavelength-converting material comprising Sr—SiON:Eu2+. The Sr—SiON:Eu2+ wavelength-converting material absorbs light emitted by the light emitting device and emits light of a longer wavelength. The Sr—SiON:Eu2+ wavelength-converting material may be combined with other wavelength-converting materials to make white light. In some embodiments, the Sr—SiON:Eu2+ wavelength-converting layer is combined with a red-emitting wavelength-converting layer and a blue light emitting device to generate emission in colors, which are not achievable by only mixing primary and secondary wavelengths. In some embodiments, the Sr—SiON:Eu2+ wavelength-converting layer is combined with a red-emitting wavelength-converting layer, a blue-emitting wavelength-converting layer, and a UV light emitting device.
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Citations
23 Claims
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1. A device comprising:
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a semiconductor light emitting device capable of emitting light of a first wavelength; and
a first wavelength-converting material comprising Sr—
SiON;
Eu2+, the first wavelength-converting material disposed to absorb light of the first wavelength;
wherein the first wavelength-converting material absorbs light of the first wavelength and emits light of a second wavelength longer than the first wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
a pair of leads electrically connected to the light emitting device; and
a lens disposed over the light emitting device.
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17. The device of claim 16 wherein the first wavelength-converting material is dispersed in an encapsulant disposed between the light emitting device and the lens.
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18. The device of claim 16 wherein the light emitting device is mounted such that light is extracted from the light emitting device through a transparent substrate.
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19. A device comprising:
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a III-nitride light emitting diode;
a green emitting phosphor comprising Sr—
SiON;
Eu2+; and
a red emitting phosphor;
wherein the green emitting phosphor and the red emitting phosphor are disposed over the III-nitride light emitting diode. - View Dependent Claims (20, 21, 22, 23)
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Specification