Solid state lighting devices including light mixtures
DCFirst Claim
1. A solid state lighting apparatus comprising:
- a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED, wherein a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity,wherein the first LED includes a first LED chip that emits light in the blue or green portions of the visible spectrum and includes a phosphor that emits red light in response to light emitted by the first LED chip, and the second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram,wherein the second LED includes a second LED chip that emits light in the blue portion of the visible spectrum and includes a second phosphor that is configured to emit yellow light in response to the light emitted by the second LED chip, andwherein the first LED emits light that is a combination of the blue or green portions of the visible spectrum from the first LED chip and the red light emitted by the phosphor.
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Abstract
A solid state lighting apparatus includes a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED. Chromaticities of the first and second LEDs are selected so that a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity. The first LED may include a first LED chip that emits light in the blue portion of the visible spectrum and a phosphor that emits red light in response to blue light emitted by the first LED chip. The second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram, and in particular may have a yellow green, greenish yellow or green hue.
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Citations
28 Claims
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1. A solid state lighting apparatus comprising:
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a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED, wherein a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity, wherein the first LED includes a first LED chip that emits light in the blue or green portions of the visible spectrum and includes a phosphor that emits red light in response to light emitted by the first LED chip, and the second LED emits light having a color point that is above the planckian locus of a 1931 CIE Chromaticity diagram, wherein the second LED includes a second LED chip that emits light in the blue portion of the visible spectrum and includes a second phosphor that is configured to emit yellow light in response to the light emitted by the second LED chip, and wherein the first LED emits light that is a combination of the blue or green portions of the visible spectrum from the first LED chip and the red light emitted by the phosphor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A solid state lighting apparatus comprising:
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a plurality of light emitting diodes (LEDs), wherein chromaticities of the LEDs are selected so that a combined light generated by a mixture of light emitted of the LEDs has about a target chromaticity, wherein the plurality of LEDs comprises a first LED including a first LED chip that emits light in the blue portion of the visible spectrum and a first phosphor that emits red light in response to blue light emitted by the first LED chip, and a second LED including a second LED chip that emits light in the blue portion of the visible spectrum and that includes a second phosphor that emits yellow light in response to light emitted by the second LED chip wherein a combined light emitted by the second LED chip and the second phosphor falls outside a 10-step Macadam ellipse about a point on the planckian locus on a 1931 CIE Chromaticity diagram. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. An illumination module, comprising:
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a plurality of light emitting diodes (LEDs) including a metameric pair of LEDs, wherein chromaticities of the LEDs of the metameric pair are selected so that a combined light generated by a mixture of light from each of the LEDs of the metameric pair comprises light having about a target chromaticity, the metameric pair comprising a first LED including a first LED chip that emits light in the blue portion of the visible spectrum and a phosphor that emits red light in response to blue light emitted by the first LED chip, and a second LED that emits non-white light that in the absence of other light appears green, yellowish-green or yellow-green, wherein the second LED comprises a second LED chip that emits blue light and a phosphor that emits yellow light in response to the blue light emitted by the second LED chip.
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24. A solid state lighting apparatus comprising:
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a plurality of light emitting diodes (LEDs) including at least a first LED and a second LED; wherein a combined light generated by a mixture of light from the pair of LEDs has about a target chromaticity; wherein the first LED includes a first LED chip that emits light in the blue or green portions of the visible spectrum and includes a phosphor that emits red light in response to light emitted by the first LED chip, wherein the first LED emits light that is a combination of the blue or green portions of the visible spectrum from the first LED chip and the red light emitted by the phosphor, wherein the combined light of the first LED chip and the phosphor has a first color point, wherein the second LED emits light having a second color point; and wherein a line segment on a 1931 CIE Chromaticity diagram between the first color point and the second color point crosses the planckian locus between about 2500 Kelvin and 4500 Kelvin. - View Dependent Claims (25, 26, 27, 28)
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Specification