Phosphors for warm white emitters
First Claim
1. A method for fabricating light-emitting devices, the method comprising:
- obtaining a plurality of light-emitting diode (LED) chips fabricated to emit blue light;
preparing a phosphor-containing material comprising a matrix material having dispersed therein a mixture of a red phosphor and a green phosphor, wherein the phosphor-containing material has about 60-80 units of red phosphor and 390-430 units of green phosphor; and
disposing different thicknesses of the phosphor-containing material on different ones of the LED chips, wherein the LED chips having different thicknesses of the phosphor-containing material emit light characterized by different points along the Planckian locus in a CIE chromaticity diagram;
combining two or more of the LED chips covered with different thicknesses of the phosphor-containing material to form an LED emitter, which emits light characterized by a point along the Planckian locus in the CIE chromaticity diagram.
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Accused Products
Abstract
A method for fabricating light-emitting devices includes obtaining a plurality of light-emitting diode (LED) chips fabricated to emit blue light and preparing a phosphor-containing material comprising a matrix material having dispersed therein a mixture of a red phosphor and a green phosphor in a fixed ratio to each other. The method also includes disposing different thicknesses of the phosphor-containing material on different ones of the LED chips. The fixed ratio is chosen such that LED chips having different thicknesses of the phosphor-containing material emit light characterized by different points along the Planckian locus in a CIE chromaticity diagram.
89 Citations
17 Claims
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1. A method for fabricating light-emitting devices, the method comprising:
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obtaining a plurality of light-emitting diode (LED) chips fabricated to emit blue light; preparing a phosphor-containing material comprising a matrix material having dispersed therein a mixture of a red phosphor and a green phosphor, wherein the phosphor-containing material has about 60-80 units of red phosphor and 390-430 units of green phosphor; and disposing different thicknesses of the phosphor-containing material on different ones of the LED chips, wherein the LED chips having different thicknesses of the phosphor-containing material emit light characterized by different points along the Planckian locus in a CIE chromaticity diagram; combining two or more of the LED chips covered with different thicknesses of the phosphor-containing material to form an LED emitter, which emits light characterized by a point along the Planckian locus in the CIE chromaticity diagram. - View Dependent Claims (2, 3, 4, 5, 7, 8)
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6. A method for fabricating light-emitting devices, the method comprising:
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obtaining a plurality of light-emitting diode (LED) chips fabricated to emit blue light; preparing a phosphor-containing material comprising a matrix material having dispersed therein a mixture of a red phosphor and a green phosphor, wherein the phosphor-containing material has about 60-80 units of red phosphor and 390-430 units of green phosphor, wherein LED chips having different thicknesses of the phosphor-containing material emit light characterized by an ellipse having a long axis substantially parallel to the Planckian locus in a CIE chromaticity diagram; and disposing different thicknesses of the phosphor-containing material on different ones of the LED chips, and combining two or more of the LED chips covered with different thicknesses of the phosphor-containing material to form an LED emitter.
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9. An LED (light-emitting-diode) emitter, comprising:
a plurality of light-emitting-diode (LED) chips configured to emit blue light, wherein different ones of the LED chips have different thicknesses of a phosphor-containing material formed thereon, the phosphor-containing material comprising a matrix material having dispersed therein a mixture of a red phosphor and a green phosphor, wherein the phosphor-containing material has about 60-80 units of red phosphor and 390-430 units of green phosphor, wherein a distribution of light emitted from the plurality of LED chips having different thicknesses of the phosphor-containing material is characterized by an ellipse having a long axis substantially parallel to the Planckian locus in a CIE chromaticity diagram. - View Dependent Claims (10, 11, 12)
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13. An LED (light-emitting-diode) emitter, comprising:
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a first light-emitting device including a wavelength-conversion material having a first thickness overlying a first light-emitting-diode (LED) chip configured to emit light of a first color; and a second light-emitting device including the wavelength-conversion material having a second thickness overlying a second light-emitting-diode (LED) chip configured to emit light of the first color, the second thickness being different from the first thickness; wherein the wavelength-conversion material comprises a matrix material having dispersed therein a mixture of a first phosphor and a second phosphor, wherein the phosphor-containing material has about 60-80 units of red phosphor and 390-430 units of green phosphor; and wherein the first light-emitting device and the first light-emitting device emit light characterized by different points along the Planckian locus in a CIE chromaticity diagram. - View Dependent Claims (14, 15, 16, 17)
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Specification