Tri-color, white light LED lamps
First Claim
1. A device comprising:
- a light emitting diode, for emitting a pattern of light; and
a composition comprising a mixture of a first phosphor and a second phosphor, each phosphor comprising a host sulfide material and a rare earth dopant, the composition being positioned in the light pattern.
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Accused Products
Abstract
The present invention relates to a tri-color lamp for generating white light. In particular, the invention relates to a phosphor mixture comprising two phosphors having host sulfide materials that can absorb radiation emitted by a light emitting diode, particularly a blue LED. This arrangement provides a mixing of three light sources—light emitted from the two phosphors and unabsorbed light emitted from the LED. The phosphors can contain the same dopant, such as a rare earth ion, to allow matching of the phosphors in relation to the LED emitted radiation. Power fractions of each of the light sources can be varied to achieve good color rendering. The present invention also relates to an alternative to a green LED comprising a single green phosphor that absorbs radiation from a blue LED. A resulting device provides green light of high absorption efficiency and high luminous equivalent values.
365 Citations
32 Claims
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1. A device comprising:
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a light emitting diode, for emitting a pattern of light; and
a composition comprising a mixture of a first phosphor and a second phosphor, each phosphor comprising a host sulfide material and a rare earth dopant, the composition being positioned in the light pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A light emitting device comprising:
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a light emitting semiconductor device emitting a first light; and
a mixture capable of converting said first light into composite light, said mixture comprising a first phosphor capable of converting said first light from said light emitting semiconductor device into a second light having a second peak in a second spectral range, and a second phosphor capable of converting said first light from the light emitting semiconductor device into a third light having a third peak in a red spectral range; and
means for directing said composite light comprising said first light, said second light, and said third light in a predetermined direction. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification