US20080029720A1 - LED lighting arrangement including light emitting phosphor - Google Patents
LED lighting arrangement including light emitting phosphor Download PDFInfo
- Publication number
- US20080029720A1 US20080029720A1 US11/640,533 US64053306A US2008029720A1 US 20080029720 A1 US20080029720 A1 US 20080029720A1 US 64053306 A US64053306 A US 64053306A US 2008029720 A1 US2008029720 A1 US 2008029720A1
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- US
- United States
- Prior art keywords
- phosphor
- optical component
- lighting arrangement
- group
- providing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/0883—Arsenides; Nitrides; Phosphides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
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- C09K11/7734—Aluminates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- C09K11/77342—Silicates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
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- C09K11/7741—Sulfates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
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- C09K11/7774—Aluminates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/12—Combinations of only three kinds of elements
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- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
- F21V3/12—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings the coatings comprising photoluminescent substances
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- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/041—Ball lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/10—Refractors for light sources comprising photoluminescent material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
-
- H—ELECTRICITY
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- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
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- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0041—Processes relating to semiconductor body packages relating to wavelength conversion elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- This invention relates to solid-state lighting applications which comprise light emitting diodes (LEDs) which include a light emitting phosphor, photoluminescent material, to generate light of a desired color, that is in a different part of the wavelength spectrum from the LEDs.
- LEDs light emitting diodes
- the invention concerns LED-based lighting arrangements which generate light in the visible part of the spectrum and in particular, although not exclusively white light.
- the invention provides an optical component for such a lighting arrangement and methods of fabricating a lighting arrangement and an optical component.
- the invention provides a phosphor material for coating an optical component or as a part of optical designs in lighting arrangements.
- light is defined as electromagnetic radiation in a wavelength range 300 nm (Ultraviolet) to 1000 nm (Infrared).
- the invention concerns lighting arrangements which emit light in the visible part of the spectrum that is 380 to 750 nm.
- White light emitting diodes are known in the art and are a relatively recent innovation. It was not until LEDs emitting in the blue/ultraviolet of the electromagnetic spectrum were developed that it became practical to develop white light sources based on LEDs.
- white light generating LEDs (“white LEDs”) include a phosphor, that is a photoluminescent material, which absorbs a portion of the radiation emitted by the LED and re-emits radiation of a different color (wavelength). For example the LED emits blue light in the visible part of the spectrum and the phosphor re-emits yellow light. Alternatively the phosphor can emit a combination of green and red light, green and yellow or yellow and red light.
- a known yellow phosphor is a YAG-based phosphor having a main emission wavelength peak that varies in wavelength range from 530 to 590 nm depending on the composition of the phosphors. Further examples of phosphors are described in our co-pending patent application U.S.
- the photoluminescent materials have a formula A 2 SiO 4 :Eu 2+ D where A is a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.
- A is a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn and Cd
- D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.
- Such phosphors emit light of intensities that are greater than either known YAG compounds or silicate-based phosphors.
- FIG. 1 a high brightness white LED 2 is shown.
- the LED 2 comprises an LED chip 4 which is mounted within a plastic or metal reflection cup 6 and the LED chip is then encapsulated within an encapsulating material, typically an epoxy resin 8 .
- the encapsulation material includes the phosphor material for providing color conversion.
- the inner surface of the cup 6 is silvered to reflect stray light towards a lens 10 which is mounted on the surface of the encapsulating epoxy resin 8 .
- the inventor has appreciated that such an arrangement has limitations and the present invention arose in an endeavor to mitigate, at least in part, these limitations.
- the high temperature at the output of the LED combined with its close proximity the phosphor material can give rise to a light characteristic which is temperature dependent and in some cases thermal degradation of the phosphor material can occur.
- the uniformity of color of light emitted by such LEDs can be difficult to maintain with the phosphor distributed within the epoxy resin since light passing through different path lengths will encounter and be absorbed by differing amounts of phosphor.
- the fabrication of such LEDs is time consuming due to the encapsulation and subsequent placement of the lens.
- a lighting arrangement comprising: a radiation source configured to emit radiation having a first wavelength range; a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and an optical component through which at least said first wavelength range radiation passes, characterized in that the phosphor is provided on a surface of the optical component.
- the phosphor is provided as a substantially uniform thickness layer on said surface of the optical component. Such an arrangement ensures a more uniform color of emitted light.
- the optical component can have a number of forms and typically comprises a lens for focusing the radiation to increase the intensity of the emitted light.
- the optical component can be for directing the radiation thus acting as a waveguide or as a window through which the radiation passes.
- the phosphor can be provided on inner or outer surfaces of the optical component and this will determine whether said second wavelength range radiation also passes through the optical component.
- the optical component has a substantially planar surface and the phosphor is provided on said substantially planar surface.
- An advantage of applying the phosphor to the planar surface is that it is easier to produce a uniform thickness layer.
- the optical component can have a convex or concave surface and the phosphor is provided on said convex or concave surfaces.
- the optical component has a substantially hemispherical surface and the phosphor is provided on said hemispherical surface.
- the optical component comprises a substantially hemispherical shell and the phosphor is provided on the inner hemispherical surface.
- the phosphor can be provided on at least a part of the outer hemispherical surface.
- the optical component comprises a substantially spherical shell and the phosphor is provided on at least a part of the inner or outer spherical surfaces.
- Such a form finds particular application as a light source for replacing incandescent light sources.
- the optical component comprises a hollow cylinder and the phosphor is provided on at least a part of the inner or outer surfaces.
- the optical component is made of a plastics material such as a polycarbonate and silicone or a glass such as a silica-based glass.
- the optical component comprises a material which is at least substantially transparent to said first wavelength range radiation and where the phosphor is provided on an inner surface of the component the material is further substantially transparent to the second wavelength range radiation.
- the phosphor comprises a powder which is incorporated within an epoxy resin, a silicone material or a polymer material to form a mixture and the phosphor mixture is then applied to the optical component to form a layer of phosphor on the optical component surface.
- the phosphor mixture advantageously further incorporates a light diffusing material such as titanium oxide, silica, alumina, etc. Such a light diffusing material has as low an absorption of light as possible.
- the phosphor advantageously comprises a phosphor which emits luminescent light when illuminated by radiation in wavelength range from 300 nm to 550 nm.
- a YAG-based phosphor which comprises a photoluminescent material having a formula (YA) 3 (AlB) 5 (OC) 12 :Ce 3+ where A is a trivalent metal selected from the group comprising Gd, Tb, La, Sm or divalent metal ions such as Sr, Ca, Ba, Mg, Zn and Cd, B comprising Si, B, P, and Ga and C is a dopant selected from the group comprising F, Cl, Br, I, P, S and N.
- the phosphor comprises a photoluminescent material having a formula A 2 SiO 4 :Eu 2+ D where A is a divalent metal selected from the group comprising Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group comprising F, Cl, Br, I, P, S and N.
- an orange-red silicate-based phosphor having a formula (SrM1) 3 Si(OD) 5 :Eu where M1 is selected from the group comprising Ba, Ca, Mg, Zn . . . and where D is selected from the group comprising F, Cl, S, and N.
- SrM1 is selected from the group comprising Ba, Ca, Mg, Zn . . .
- D is selected from the group comprising F, Cl, S, and N.
- Such a phosphor is advantageously used for emitting light in a wavelength range from green to yellow (580 to 630 nm).
- the phosphor comprises a red silicon nitride based phosphor having a formula (SrM1)Si 5 N 8 where M1 is selected from the group comprising Sr, Ca, Mg, and Zn.
- the phosphor comprises a red sulfate based phosphor having a formula of (SrM1)S where M1 is selected from the group comprising Ca, Ba, and Mg.
- the phosphor can comprise a green sulfate based phosphor having a formula of (SrM1)(GaM2) 2 S 4 :Eu where M1 is selected from the group comprising Ca, Ba, and Mg, and M2 is selected from the group comprising Al and In.
- the radiation source comprises a light emitting diode, advantageously a Gallium Nitride based LED.
- the radiation source is operable to emit radiation having a wavelength range of 300 to 500 nm.
- the phosphor composition is configured to emit radiation having a wavelength ranging from 450 to 700 nm.
- an optical component for a lighting arrangement of a type comprising a radiation source configured to emit radiation having a first wavelength range; a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and said optical component configured such that at least said first wavelength range radiation passes through the optical component, and characterized in that said phosphor is provided on a surface of said optical component.
- Such an optical component provides the advantages of reducing the manufacturing steps and hence cost and emits a more uniform color light. Moreover such an optical component can be used to provide direct color conversion in an LED arrangement.
- the phosphor is advantageously provided as a substantially uniform thickness layer on said surface of the optical component.
- the optical component preferably has a substantially planar surface and the phosphor is provided on said substantially planar surface.
- the optical component has a convex or concave surface and the phosphor is provided on said convex or concave surfaces by for example spraying or printing related coating methods.
- the optical component has a substantially hemispherical surface and the phosphor is provided on said hemispherical surface.
- the optical component can comprise a substantially hemispherical shell and the phosphor is provided on the inner hemispherical surface.
- Such an arrangement provides environmental protection of the phosphor.
- the phosphor is provided on the outer hemispherical surface.
- the optical component comprises a substantially spherical shell and the phosphor is provided on at least a part of the inner or outer spherical surfaces.
- the optical component comprises a hollow cylinder and the phosphor is provided on at least a part of the inner or outer surfaces.
- the phosphor comprises a powder which is incorporated within an epoxy resin, a silicone material or a polymer material to form a mixture and then the phosphor mixture is applied to the optical component to form a layer of phosphor on the optical component surface.
- the phosphor mixture advantageously further comprises a light diffusing material.
- the optical component is fabricated from a plastics material or a glass.
- the phosphor advantageously comprises a photoluminescent material having a formula A 2 SiO 4 :Eu 2+ D where A is a divalent metal selected from the group comprising Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group comprising F, Cl, Br, I, P, S and N.
- a method of fabricating a lighting arrangement comprising: providing a radiation source configured to emit radiation having a first wavelength range and an optical component through which said radiation passes; and providing on a surface of the optical component a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range.
- the method further comprises providing the phosphor as a substantially uniform thickness layer on said surface of the optical component.
- the optical component can have a substantially planar surface, convex or concave surfaces and the method comprises providing the phosphor on said substantially planar surface, convex or concave surfaces.
- the optical component has a substantially hemispherical surface and the method comprises providing the phosphor on said hemispherical surface.
- the optical component comprises a substantially hemispherical shell and the method comprises providing the phosphor on the inner or outer hemispherical surfaces.
- the optical component can comprise a substantially spherical shell and the method comprises providing the phosphor on at least a part of the inner or outer spherical surfaces.
- the optical component comprises a hollow cylinder and the method comprises providing the phosphor on at least a part of the inner or outer surfaces.
- the optical component is preferably fabricated from a plastics material or glass.
- an optical component for a lighting arrangement of a type comprising a radiation source configured to emit radiation having a first wavelength range; a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and said optical component being configured such that at least said first wavelength range radiation passes through the optical component the method comprising providing said phosphor on a surface of the optical component.
- the method advantageously comprises providing the phosphor as a substantially uniform thickness layer.
- the method preferably comprises providing the phosphor on said substantially planar surface.
- the method can comprise providing the phosphor on said convex or concave surfaces.
- the optical component has a substantially hemispherical surface and the method comprises providing the phosphor on said hemispherical surface.
- the method comprises providing the phosphor on the inner or outer hemispherical surfaces.
- the optical component comprises a substantially spherical shell the method comprises providing the phosphor on at least a part of the inner or outer spherical surfaces.
- the optical component can comprise a hollow cylinder and the method comprises providing the phosphor on at least a part of the inner or outer surfaces.
- the phosphor comprises a powder and the method comprises incorporating the phosphor within an epoxy resin or silicone material or polymer material to form a mixture and then applying the phosphor mixture to the optical component to form a layer of phosphor on the optical component surface.
- the mixture can be applied by painting the mixture onto the surface of the optical component, spraying or other known deposition techniques.
- the optical component is then advantageously spun or tape casting to distribute the mixture uniformly over the surface to thereby ensure a uniform thickness of phosphor forms.
- the method further comprises incorporating a light diffusing material, for example titanium oxide, silica, alumina in the phosphor mixture.
- a light diffusing material for example titanium oxide, silica, alumina
- the light diffusing material can be provided as a separate layer.
- the phosphor comprises a photoluminescent material having a formula A 2 SiO 4 :Eu 2+ D where A is a divalent metal selected from the group comprising Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group comprising F, Cl, Br, I, P, S and N.
- the method further comprises fabricating the optical component from a plastics material or glass.
- a plurality of optical components in the form of an array said array of optical components having a common planar surface, and said phosphor is deposited on the planar surface.
- the phosphor is provided as a substantially uniform thickness layer on said planar surface of the array of optical components.
- a phosphor material for coating an optical component of an LED comprising a phosphor powder incorporated within an epoxy resin, a silicone material or a polymer material.
- the phosphor material further incorporates a light diffusing material.
- an optical component for a lighting arrangement of a type comprising a radiation source configured to emit radiation having a first wavelength range; a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and said optical component being configured such that at least said first wavelength range radiation passes through the optical component, and characterized in that said phosphor is incorporated in said optical component.
- FIG. 1 is a schematic representation of a known white LED as already described
- FIGS. 2 to 7 are schematic representations of LED lighting arrangements in accordance with the invention.
- FIG. 8 is a schematic representation of a method of fabricating an optical component for an LED lighting arrangement in accordance with the invention.
- the LED lighting arrangement 20 is for generating light of a selected color for example white light.
- the lighting arrangement comprises a LED chip 22 , preferably a Gallium Nitride chip, which is operable to produce light, radiation, preferably of wavelength in a range 300 to 500 nm.
- the LED chip 22 is mounted inside a stainless steel enclosure or reflection cup 24 which has metallic silver deposited on its inner surface to reflect light towards the output of the lighting arrangement.
- a convex lens 26 is provided to focus light output from the arrangement.
- the lens 26 is substantially hemispherical in form.
- the lens 26 can be made of a plastics material such as polycarbonates or glass such as silica based glass or any material substantially transparent to the wavelengths of light generated by the LED chip 22 .
- the lens 26 has a planar, substantially flat, surface 28 onto which there is provided a layer of phosphor 30 before the lens is mounted to the enclosure 22 .
- the phosphor 30 preferably comprises a photoluminescent material having a formula A 2 SiO 4 :Eu 2+ D where A is a divalent metal selected from the group comprising Sr (Strontium), Ca (Calcium), Ba (Barium), Mg (Magnesium), Zn (Zinc) and Cd (Cadmium) and D is a dopant selected from the group comprising F (Fluorine), Cl (Chlorine), Br (Bromine), I (Iodine), P (Phosphorous), S (Sulfur) and N (Nitrogen) as disclosed in our co-pending patent application U.S.
- the phosphor which is in the form of a powder is mixed with an adhesive material such as epoxy or a silicone resin, or a transparent polymer material and the mixture is then applied to the surface of the lens to provide the phosphor layer 30 .
- the mixture can be applied by painting, dropping or spraying or other deposition techniques which will be readily apparent to those skilled in the art.
- the phosphor mixture preferably further includes a light diffusing material such as titanium oxide, silica or alumina to ensure a more uniform light output.
- the color of light emitted from the lighting arrangement can be controlled by appropriate selection of the phosphor composition as well as the thickness of the phosphor layer which will determine the proportion of output light originating from the phosphor.
- the phosphor layer is preferably of uniform thickness and has a typical thickness in a range 20 to 500 ⁇ m.
- An advantage of the lighting arrangement of the invention is that no phosphor need be incorporated within the encapsulation materials in the LED package. Moreover the color of the light output by the arrangement can be readily changed by providing a different lens having an appropriate phosphor layer. This enables large scale production of a common laser package. Moreover such a lens provides direct color conversion in an LED lighting arrangement.
- FIG. 3 there is shown an LED lighting arrangement in accordance with a further embodiment in which the phosphor 30 is provided as a layer on the outer convex surface 32 of the lens 26 .
- the lens 26 is dome shaped in form.
- FIG. 4 shows an LED lighting arrangement in accordance with a further embodiment in which the lens 26 comprises a substantially hemispherical shell and the phosphor 30 is provided on the inner surface 34 of the lens 26 .
- An advantage of providing the phosphor on the inner surface is that the lens 26 then provides environmental protection for the LED and phosphor.
- the phosphor can be applied as a layer of the outer surface of the lens 26 (not shown).
- FIG. 5 illustrates an LED arrangement in which the lens 26 , optical component, comprises a substantially spherical shell and the phosphor 30 is deposited as a layer on at least a part of the inner 36 or outer spherical 38 surfaces and the LED chip 22 is mounted within the spherical shell.
- the chip are oriented such that they each emit light in differing directions. Such a form is preferred as a light source for replacing existing incandescent light sources (light bulbs).
- the optical component 26 comprises a hollow cylindrical form and the phosphor is applied to the inner 40 or outer 42 curved surfaces.
- the laser chip preferably comprises a linear array of laser chips that are arranged along the axis of the cylinder.
- the lens 26 can comprise a solid cylinder (not shown).
- FIG. 7 shows an LED arrangement in which the optical component comprise a solid substantially spherical lens 26 and the phosphor is provided on at least a part of the spherical surface 44 .
- the phosphor is applied to only a portion of the surface, which surface is then mounted within the volume defined by the enclosure. By mounting the lens 26 in this way this provides environmental protection of the phosphor 30 .
- FIG. 8 there is shown a preferred method of fabricating lenses in accordance with the invention.
- An array of lenses 46 is provided in which the lenses have a common planar surface 48 onto which the phosphor 30 is provided.
- the lenses 36 are substantially hemispherical in form. After the phosphor has been deposited the lenses can be separated and mounted to the LED assemblies. Such a method is found to be particularly advantageous for mass production of the optical components.
- the present invention is not restricted to the specific embodiments described and that modifications can be made which are within the scope of the invention.
- the phosphor can be deposited onto other optical components such as for example a window through which light passes though is not necessarily focused or directed or a waveguide which guides, directs, light.
- the optical component can have many forms which will be readily apparent to those skilled in the art.
- the phosphor and LED chip can be selected depending on the intended application to provide light of a desired color. It is also envisaged to provide two or more phosphor materials to achieve the desired color, spectral content, of emitted light.
- the different phosphors can be provided by mixing the powdered material and incorporating them within a single layer or alternatively by providing multiple layers of different phosphors.
- Examples of preferred phosphors are:
- green sulfate based phosphors having a general formula (SrM1)(GaM2) 2 S 4 :Eu where M1 is selected from the group comprising Ca, Ba, and Mg, and where M2 is selected from the group comprising Al and In.
- the invention further provides a novel optical component and method of fabrication thereof.
- the phosphor within material comprising the optical component.
- the phosphor can be provided as a layer on the encapsulating material.
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Priority Applications (20)
Application Number | Priority Date | Filing Date | Title |
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US11/640,533 US20080029720A1 (en) | 2006-08-03 | 2006-12-15 | LED lighting arrangement including light emitting phosphor |
JP2009522877A JP2009545888A (ja) | 2006-08-03 | 2007-08-02 | 光放出蛍光体を包含するled照明配置 |
PCT/US2007/017299 WO2008019041A2 (en) | 2006-08-03 | 2007-08-02 | Led lighting arrangement including light emitting phosphor |
CN2010105254928A CN102062359A (zh) | 2006-08-03 | 2007-08-02 | 包含发光磷光体的发光二极管照明布置 |
EP07811039A EP2055147A4 (en) | 2006-08-03 | 2007-08-02 | LED LIGHTING DEVICE COMPRISING A LUMINESCENT PHOSPHOR |
KR1020097004371A KR20090040360A (ko) | 2006-08-03 | 2007-08-02 | 발광인광체를 포함하는 led 조명장치 |
TW102100038A TW201316543A (zh) | 2006-08-03 | 2007-08-03 | 含發光磷光體之發光二極體(led)照明配置 |
TW096128666A TWI392112B (zh) | 2006-08-03 | 2007-08-03 | 含發光磷光體之發光二極體(led)照明配置 |
US12/624,839 US8067884B2 (en) | 2006-08-03 | 2009-11-24 | LED lighting arrangement including a substantially spherical optical component having a surface partially coated with a light emitting phosphor |
US12/624,900 US20100067217A1 (en) | 2006-08-03 | 2009-11-24 | Led lighting arrangement including light emitting phosphor |
US13/087,615 US20110187262A1 (en) | 2006-08-03 | 2011-04-15 | Led lighting arrangement including light emitting phosphor |
US13/436,329 US20120187823A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,471 US20120187822A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,507 US20120182715A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor and method of manufacture |
US13/441,714 US9045688B2 (en) | 2006-08-03 | 2012-04-06 | LED lighting arrangement including light emitting phosphor |
US13/931,669 US20130293098A1 (en) | 2006-08-03 | 2013-06-28 | Solid-state linear lighting arrangements including light emitting phosphor |
JP2013154964A JP2013254972A (ja) | 2006-08-03 | 2013-07-25 | 光放出蛍光体を包含するled照明装置 |
US14/157,501 US20140306599A1 (en) | 2006-08-03 | 2014-01-16 | Solid-state linear lighting arrangements including light emitting phosphor |
US14/727,814 US9595644B2 (en) | 2006-08-03 | 2015-06-01 | LED lighting arrangement including light emitting phosphor |
US15/653,071 US10274166B2 (en) | 2006-08-03 | 2017-07-18 | Solid-state linear lighting arrangements including light emitting phosphor |
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US83560106P | 2006-08-03 | 2006-08-03 | |
US11/640,533 US20080029720A1 (en) | 2006-08-03 | 2006-12-15 | LED lighting arrangement including light emitting phosphor |
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US12/624,839 Continuation US8067884B2 (en) | 2006-08-03 | 2009-11-24 | LED lighting arrangement including a substantially spherical optical component having a surface partially coated with a light emitting phosphor |
US12/624,900 Continuation US20100067217A1 (en) | 2006-08-03 | 2009-11-24 | Led lighting arrangement including light emitting phosphor |
US13/087,615 Division US20110187262A1 (en) | 2006-08-03 | 2011-04-15 | Led lighting arrangement including light emitting phosphor |
US13/436,471 Continuation US20120187822A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,507 Continuation US20120182715A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor and method of manufacture |
US13/436,329 Continuation US20120187823A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/441,714 Continuation US9045688B2 (en) | 2006-08-03 | 2012-04-06 | LED lighting arrangement including light emitting phosphor |
US13/931,669 Continuation-In-Part US20130293098A1 (en) | 2006-08-03 | 2013-06-28 | Solid-state linear lighting arrangements including light emitting phosphor |
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US12/624,839 Expired - Fee Related US8067884B2 (en) | 2006-08-03 | 2009-11-24 | LED lighting arrangement including a substantially spherical optical component having a surface partially coated with a light emitting phosphor |
US12/624,900 Abandoned US20100067217A1 (en) | 2006-08-03 | 2009-11-24 | Led lighting arrangement including light emitting phosphor |
US13/087,615 Abandoned US20110187262A1 (en) | 2006-08-03 | 2011-04-15 | Led lighting arrangement including light emitting phosphor |
US13/436,471 Abandoned US20120187822A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,329 Abandoned US20120187823A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,507 Abandoned US20120182715A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor and method of manufacture |
US13/441,714 Active US9045688B2 (en) | 2006-08-03 | 2012-04-06 | LED lighting arrangement including light emitting phosphor |
US14/727,814 Active 2027-03-11 US9595644B2 (en) | 2006-08-03 | 2015-06-01 | LED lighting arrangement including light emitting phosphor |
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Application Number | Title | Priority Date | Filing Date |
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US12/624,839 Expired - Fee Related US8067884B2 (en) | 2006-08-03 | 2009-11-24 | LED lighting arrangement including a substantially spherical optical component having a surface partially coated with a light emitting phosphor |
US12/624,900 Abandoned US20100067217A1 (en) | 2006-08-03 | 2009-11-24 | Led lighting arrangement including light emitting phosphor |
US13/087,615 Abandoned US20110187262A1 (en) | 2006-08-03 | 2011-04-15 | Led lighting arrangement including light emitting phosphor |
US13/436,471 Abandoned US20120187822A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,329 Abandoned US20120187823A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor |
US13/436,507 Abandoned US20120182715A1 (en) | 2006-08-03 | 2012-03-30 | Led lighting arrangement including light emitting phosphor and method of manufacture |
US13/441,714 Active US9045688B2 (en) | 2006-08-03 | 2012-04-06 | LED lighting arrangement including light emitting phosphor |
US14/727,814 Active 2027-03-11 US9595644B2 (en) | 2006-08-03 | 2015-06-01 | LED lighting arrangement including light emitting phosphor |
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EP (1) | EP2055147A4 (zh) |
JP (2) | JP2009545888A (zh) |
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TW200814377A (en) | 2008-03-16 |
US8067884B2 (en) | 2011-11-29 |
WO2008019041A2 (en) | 2008-02-14 |
US20120187822A1 (en) | 2012-07-26 |
US20100067217A1 (en) | 2010-03-18 |
US9045688B2 (en) | 2015-06-02 |
WO2008019041A3 (en) | 2008-10-30 |
KR20090040360A (ko) | 2009-04-23 |
US20160141461A1 (en) | 2016-05-19 |
US9595644B2 (en) | 2017-03-14 |
EP2055147A2 (en) | 2009-05-06 |
JP2013254972A (ja) | 2013-12-19 |
JP2009545888A (ja) | 2009-12-24 |
TWI392112B (zh) | 2013-04-01 |
US20120182715A1 (en) | 2012-07-19 |
EP2055147A4 (en) | 2011-05-18 |
US20100067216A1 (en) | 2010-03-18 |
TW201316543A (zh) | 2013-04-16 |
CN102062359A (zh) | 2011-05-18 |
US20120187441A1 (en) | 2012-07-26 |
US20110187262A1 (en) | 2011-08-04 |
US20120187823A1 (en) | 2012-07-26 |
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