Enhanced color rendering index emitter through phosphor separation
First Claim
1. A solid state lamp, comprising:
- a light emitting diode (LED) on a surface;
a first conversion material with light from said LED passing through said first conversion material, wherein said first conversion material converts and re-emits at least some of said LED light;
a second conversion material on said surface and spaced from said first conversion material by an optical cavity, with light from said LED passing through said second conversion material, wherein said second conversion material converts and re-emits at least some of said LED light;
wherein said first conversion material comprises an excitation spectrum that overlaps with the emission spectrum of said second conversion material.
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Accused Products
Abstract
LED packages, and LED lamps and bulbs, are disclosed that are arranged to minimize the CRI and efficiency losses resulting from the overlap of conversion material emission and excitation spectrum. In different devices having conversion materials with this overlap, the present invention arranges the conversion materials to reduce the likelihood that re-emitted light from a first conversion materials will encounter the second conversion material to minimize the risk of re-absorption. In some embodiments this risk is minimized by different arrangements where there is separation between the two phosphors. In some embodiments this separation results less than 50% of re-emitted light from the one phosphor passing into the phosphor where it risks re-absorption.
562 Citations
52 Claims
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1. A solid state lamp, comprising:
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a light emitting diode (LED) on a surface; a first conversion material with light from said LED passing through said first conversion material, wherein said first conversion material converts and re-emits at least some of said LED light; a second conversion material on said surface and spaced from said first conversion material by an optical cavity, with light from said LED passing through said second conversion material, wherein said second conversion material converts and re-emits at least some of said LED light; wherein said first conversion material comprises an excitation spectrum that overlaps with the emission spectrum of said second conversion material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 31, 32, 33, 34, 35, 36, 37)
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15. A solid state lamp, comprising:
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a plurality of light emitting diodes (LEDs); a first red phosphor and a second red phosphor different than said first red phosphor, at least one of said first and second red phosphors on a first of said LEDs, with light from said first LED passing through said at least one red phosphor; and a yellow or green phosphor separated from and over said LEDs, light from said LEDs passing through said yellow or green phosphor, wherein said first and second red phosphors comprise excitation spectrums that overlap with the emission spectrum of said yellow or green phosphor. - View Dependent Claims (16, 17, 18, 19, 20, 21, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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22. A solid state lamp, comprising:
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a light emitting diode (LED) emitting a first wavelength of light; a conformal coating comprising a first phosphor on said LED, said coating absorbing some of the light emitted from said LED and re-emitting a second wavelength of light; and a second phosphor spaced from said first phosphor by an optical cavity, with light from said LED passing through said second phosphor, said second phosphor absorbing at least some of said first wavelength of light and re-emitting a third wavelength of light, wherein the emission spectrum of said second phosphor overlaps the excitation spectrum of said first phosphor, and wherein the majority of light from said second phosphor does not encounter said first phosphor. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 47, 48, 49, 50, 51, 52)
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Specification