LED LAMP WITH COLOR-MIXING CAVITY
First Claim
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1. A white-light-emitting device comprising:
- a plurality of ultraviolet or blue light-emitting diodes (LEDs) having at least one emission surface;
a conversion coating spaced away from but enveloping the at least one emission surface to define a first mixing cavity therearound, the conversion coating converting a color of at least a portion of the light emitted by the plurality of LEDs to a different color;
at least one secondary LED, emitting light of a color different from ultraviolet and blue, spaced away from the first mixing cavity; and
a diffuser spaced away from but enveloping the conversion coating and the secondary LED to define therearound a second mixing cavity that is unfilled, wherein mixing of the converted light and the light from the at least one secondary LED produces white light that is emitted through the diffuser.
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Abstract
A device for emitting white light includes, in certain embodiments, an ultraviolet and/or a blue LED having an emission surface, a conversion coating spaced away from but enveloping the emission surface to form a first mixing cavity, at least one secondary LED emitting a color different from ultraviolet and blue and spaced away from the conversion coating, and a diffuser spaced away from but enveloping the conversion coating and the secondary LED to define a second mixing cavity that is unfilled.
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Citations
12 Claims
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1. A white-light-emitting device comprising:
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a plurality of ultraviolet or blue light-emitting diodes (LEDs) having at least one emission surface; a conversion coating spaced away from but enveloping the at least one emission surface to define a first mixing cavity therearound, the conversion coating converting a color of at least a portion of the light emitted by the plurality of LEDs to a different color; at least one secondary LED, emitting light of a color different from ultraviolet and blue, spaced away from the first mixing cavity; and a diffuser spaced away from but enveloping the conversion coating and the secondary LED to define therearound a second mixing cavity that is unfilled, wherein mixing of the converted light and the light from the at least one secondary LED produces white light that is emitted through the diffuser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A white-light-emitting device comprising:
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A plurality of ultraviolet or blue light-emitting diodes (LEDs) having at least one emission surface; a housing filled with a conversion material and enveloping the at least one emission surface; a reflective coating surrounding the conversion coating; at least one secondary LED, emitting light of a color different from ultraviolet and blue, spaced away from the conversion coating; and a diffuser spaced away from but enveloping the conversion coating and the secondary LED to define therearound a second mixing cavity that is unfilled, wherein mixing of the converted light and the light from the at least one secondary LED produces white light that is emitted through the diffuser.
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11. A method for producing white light using LEDs, the method comprising:
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(i) generating blue or UV light; (ii) converting the blue or UV light to light having a longer wavelength; (iii) generating light having a wavelength different from that of the blue, UV, and converted light; and (iv) mixing the light of steps (i), (ii), and (iii) in an unfilled spatial void to generate white light.
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12. The method of claim 12, wherein the light of step (i) is generated in a first cavity and light of step (iii) is generated in a second cavity distinct from the first cavity, and further comprising reflecting, from the first cavity, at least a portion of the light generated in step (iii).
Specification