Light emitting device with phosphor wavelength conversion
First Claim
1. A light emitting device comprising:
- an excitation source operable to generate excitation light of a first wavelength range; and
at least one phosphor material configured to absorb at least a part of the excitation light and to emit light of a second wavelength range,wherein at least the light emitting surface of the excitation source is coated with an encapsulating material which is substantially transmissive to light of the first and second wavelength ranges, andwherein the encapsulating material incorporates a thermally conducting material distributed throughout its volume, and wherein the thermally conducting material is selected from the group consisting of a carbon, and graphite.
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Accused Products
Abstract
A light emitting device comprises: an excitation source (LED) operable to generate excitation light of a first wavelength range and a phosphor (photo-luminescent) material configured to absorb at least a part of the excitation radiation and to emit light of a second wavelength range. Light emitted by the device comprises the combined light of the first and second wavelength ranges. The device is characterized by at least the light emitting surface of the excitation source being coated (encapsulated) with an encapsulating material which is transparent to light of the first and second wavelength ranges and which incorporates particles of a thermally conducting material (thermal conductivity ≧100 Wm−1K−1, e.g. silver, aluminum or carbon nano-particles) distributed throughout its volume. The phosphor material can be provided on a surface of the encapsulating material, incorporated in the encapsulating material and/or applied to the surface of, or incorporated, in an optical component such as a lens.
85 Citations
19 Claims
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1. A light emitting device comprising:
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an excitation source operable to generate excitation light of a first wavelength range; and at least one phosphor material configured to absorb at least a part of the excitation light and to emit light of a second wavelength range, wherein at least the light emitting surface of the excitation source is coated with an encapsulating material which is substantially transmissive to light of the first and second wavelength ranges, and wherein the encapsulating material incorporates a thermally conducting material distributed throughout its volume, and wherein the thermally conducting material is selected from the group consisting of a carbon, and graphite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19)
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16. A light emitting device comprising:
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a light emitting diode operable to generate excitation light of a first wavelength range; and at least one phosphor material configured to absorb at least a part of the excitation light and to emit light of a second wavelength range, wherein at least the light emitting surface of the light emitting diode is coated with an encapsulating material which is substantially transmissive to light of the first and second wavelength ranges, and wherein the encapsulating material incorporates a thermally conducting material distributed throughout its volume, and wherein the thermally conducting material is selected from the group consisting of a carbon, and graphite.
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Specification