WO2022167244A1 - Coating for led lighting device - Google Patents

Coating for led lighting device Download PDF

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Publication number
WO2022167244A1
WO2022167244A1 PCT/EP2022/051468 EP2022051468W WO2022167244A1 WO 2022167244 A1 WO2022167244 A1 WO 2022167244A1 EP 2022051468 W EP2022051468 W EP 2022051468W WO 2022167244 A1 WO2022167244 A1 WO 2022167244A1
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WO
WIPO (PCT)
Prior art keywords
coating
cerium
holmium oxide
led
lighting device
Prior art date
Application number
PCT/EP2022/051468
Other languages
French (fr)
Inventor
Jiming LING
Zhou ZHIJIANG
Morna SHEN
Original Assignee
Signify Holding B.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2022167244A1 publication Critical patent/WO2022167244A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
    • C03C17/008—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character comprising a mixture of materials covered by two or more of the groups C03C17/02, C03C17/06, C03C17/22 and C03C17/28
    • C03C17/009—Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C09D5/027—Dispersing agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C09D5/028—Pigments; Filters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/033—Powdery paints characterised by the additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/66—Details of globes or covers forming part of the light source
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/44—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the composition of the continuous phase
    • C03C2217/445—Organic continuous phases
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/48—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase having a specific function
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
    • C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb

Definitions

  • the present invention generally relates to a coating for a LED lighting device.
  • LEDs light emitting diodes
  • LEDs provide numerous advantages such as a longer operational life, a reduced power consumption, and an increased efficiency related to the ratio between light energy and heat energy.
  • the solutions used today may include the use of different coatings for lighting devices, wherein these coatings comprise diffusor materials (e.g. CaCOi, AI2O3 or SiOi powder) and (remote) phosphors (e.g. Y3AI5O12 or YGasOn) in order to achieve a pleasing lighting profile.
  • diffusor materials e.g. CaCOi, AI2O3 or SiOi powder
  • remote phosphors e.g. Y3AI5O12 or YGasOn
  • the material(s) of the coatings of the prior art suffer from an inadequate light efficiency and/or an insufficient aesthetic effect of the light via the coatings.
  • the material(s) of the coatings may be relatively expensive.
  • the combination of the different coating materials may lead to relatively complex coating compositions.
  • a coating for a LED lighting device comprising cerium-doped, Ce, holmium oxide, HO2O3, wherein the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%, and a binding agent mixed with the cerium-doped holmium oxide, wherein the binding agent is arranged to adhere the coating to at least a portion of the LED lighting device, and wherein the cerium-doped holmium oxide comprises 0.1 - 10 wt% cerium compared to the total cerium-doped holmium oxide, preferably 2 - 6 wt% Ce, more preferably 3 - 5 wt% Ce, most preferably 4 wt% Ce.
  • a method of coating at least a portion of a LED lighting device using a coating according to the first aspect of the present invention is provided.
  • a method of producing a coating for a light-emitting diode, LED, lighting device comprises the steps of: providing cerium-doped, Ce, holmium oxide, HO2O3, wherein the cerium-doped holmium oxide comprises 0.1 - 10 wt% cerium compared to the total cerium- doped holmium oxide, preferably 2 - 6 wt% Ce, more preferably 3 - 5 wt% Ce, most preferably 4 wt% Ce; providing a binding agent; and mixing the cerium-doped holmium oxide and the binding agent to form a mixture, so that the content of cerium-doped holmium oxide is 6 to 88 wt% in the mixture.
  • the first, second and third aspects of the present invention are based on the idea of providing a coating for a LED lighting device.
  • the coating comprises cerium- doped holmium oxide and a binding agent, wherein the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%.
  • the coating may provide high optical efficiency for a LED lighting device, and a more aesthetically appealing light effect during operation.
  • the present invention is advantageous in that the coating may diffuse light emitted by a LED lighting device, and that the optical efficiency when used with a LED lighting device may be improved.
  • optical efficiency it is here meant, but not limited to, the ratio of the total luminous flux by a light source to the total radiant flux from the same light source.
  • the luminous flux is the perceived power of the light (as perceived by a human) emitted by the light source, and the radiant flux is total power of all electromagnetic radiation emitted by the light source.
  • the optical efficiency may be up to 100%.
  • TLED lamps with the coating applied which may have 95.5% optical efficiency.
  • LED filament lamps with glass bulbs which may have up to 100% optical efficiency.
  • the present invention is further advantageous in that the coating reduces blue light, thus providing a more decorative and appealing lighting, as well as a more pleasing light.
  • blue light there are some concerns on blue light hazard to human eyes. With the reduced blue light from the LED lighting device according to present invention, such concerns might be relieved on certain level, in other words, the LED lighting device according to the present invention might be helpful for human being’s eye protection.
  • blue light it is here meant, but not limited to, the part of the visible spectrum of light with the shortest wavelengths, i.e. around 380 to 490 nm.
  • the coating may be used as a phosphor and a diffuser.
  • a phosphor and a diffuser may be used as a phosphor and a diffuser.
  • the method according to the second aspect of the present invention is more (cost-) efficient and/or convenient than the coatings according to the prior art, since the coating according to the first aspect of the present invention may act as a phosphor and as a diffuser.
  • the coating of the present invention is relatively inexpensive to produce. More specifically, the materials used in the coating has a lower, or even significantly lower, price per weight (kilogram) than coating material(s) of the prior art.
  • the coating provides efficient lighting while being relatively inexpensive to produce.
  • the coating for a LED lighting device comprises cerium-doped, Ce, holmium oxide, HO2O3.
  • the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%.
  • wt% it is here meant the weight percentage.
  • the coating further comprises a binding agent mixed with the cerium-doped holmium oxide.
  • the binding agent is arranged to adhere the coating to at least a portion of the LED lighting device.
  • adhere it is here meant, but not limited to, fastening, sticking and/or clinging to.
  • the coating may be adhered to the LED lighting device such that all, or a part, of the light emitted by the LED lighting device is transmitted by the coating.
  • the coating may be reflective and/or light transmissive for different wavelengths.
  • the coating may be translucent or transparent for a substantial part of the visible wavelength spectrum. The visible wavelength spectrum is around 380 nm to 700 nm.
  • the coating may for example be at least partially reflective for the part of the visible spectrum of light with the shortest wavelengths, i.e. around 380 to 490 nm.
  • the binding agent comprises an electrostatic powder.
  • the coating may adhere more efficiently to a LED lighting device.
  • the coating may be adhered to the LED lighting device using spraying methods.
  • the present embodiment is further advantageous in that the process of adhering the coating to a LED lighting device may be done in an efficient and cost-effective manner.
  • the binding agent is an acrylic polymer and the coating further comprises demineralized water.
  • the coating further comprises at least one of CaCCb, AI2O3 and SiCh.
  • the present embodiment is advantageous in that the diffusion of the emitted light may be more decorative and aesthetically pleasing.
  • the content of cerium- doped holmium oxide in the coating is preferably 6 to 70 wt%, more preferably 6 to 50 wt% and even more preferred 6 to 30 wt%.
  • the present embodiment is advantageous in that the optical efficiency of a lighting device using the coating may be improved. Furthermore, this is advantageous in that the production of the coating may be more cost effective, while the coating still provides a high and satisfactory optical efficiency. This is further advantageous in that the coating may reduce the intensity of the blue light in the emitted light, while providing a decorative and aesthetically pleasing emitted light, at a less expensive price.
  • the cerium-doped holmium oxide is a powder. This is advantageous in that the coating may be easier to employ. For example, the coating may be adhered more easily to a LED lighting device using spraying methods.
  • a LED lighting device may comprise at least one LED light source arranged to emit light.
  • the LED lighting device may further comprise a cover configured to at least partially enclose the at least one LED light source, wherein the cover is configured to at least partially transmit the light emitted by the at least one LED light source.
  • cover it is here meant, but not limited to, an enclosing element, such as a cap, bulb, envelope, or the like, comprising an at least partially translucent and/or transparent material.
  • the LED lighting device may further comprise a coating according to any one of the preceding embodiments of the first aspect of the present invention. The coating may be adhered partially or completely on any surface of the cover.
  • the whole inner surface of the cover may be coated with the coating.
  • the coating may be adhered on the cover such that all, or part of, the light emitted by the LED light source is transmitted by the coating, thereby allowing the coating to act as a diffuser and phosphor for the LED lighting device.
  • a luminaire may comprise a LED lighting device according to the preceding embodiment of the present invention.
  • the luminaire may be at least one of a tubular LED, a bulb-shaped LED lamp and a LED High Intensity Bulb.
  • the binding agent comprises an electrostatic powder. This is advantageous in that the produced coating may adhere more efficiently to a LED lighting device. For example, the coating may be adhered to a LED lighting device using spraying methods.
  • the present embodiment is further advantageous in that the process of adhering the produced coating to a LED lighting device may be done in an efficient and cost-effective manner.
  • the method further comprises a step of providing water, and the binding agent comprises an acrylic polymer, and wherein the step of mixing comprises mixing the cerium-doped holmium oxide, the binding agent and water.
  • the method further comprises a step of providing a compound comprising at least one of CaCCh, AI2O3 and SiC>2, and wherein the mixing comprises mixing the compound, the cerium-doped holmium oxide, the binding agent and when the binding agent comprises an acrylic polymer, water.
  • the present embodiment is advantageous in that the produced coating may have an improved diffusion of the emitted light, for example the emitted light may be more decorative and aesthetically pleasing.
  • the step of mixing is performed so that the content of cerium-doped holmium oxide is preferably 6 to 70 wt%, more preferably 6 to 50 wt% and even more preferred 6 to 30 wt% in the mixture.
  • the present embodiment is advantageous in that the produced coating may have an improved optical efficiency. Furthermore, this is advantageous in that the production of the coating may be more cost effective, while the produced coating still provides a high and satisfactory optical efficiency. This is further advantageous in that the produced coating may reduce the intensity of the blue light in the emitted light, while providing a decorative and aesthetically pleasing emitted light, at a cheaper price.
  • the cerium-doped holmium oxide is a powder This is advantageous in that the produced coating may be easier to employ. For example, the produced coating may be adhered more easily to a LED lighting device using spraying methods.
  • FIG. 1 shows a schematic view of a LED lighting device with a coating according to exemplifying embodiments of the present invention.
  • Fig. 2a shows a schematic top-view of a tubular shaped LED lighting device with a coating according to exemplifying embodiments of the present invention.
  • Fig. 2a shows a schematic side-view of a tubular shaped LED lighting device with a coating according to exemplifying embodiments of the present invention.
  • Fig. 3 shows a graph illustrating the relation between the wavelength and the optical efficiency of the emitted light of a LED lighting device using the coating according to exemplifying embodiments of the present invention.
  • Fig. 1 shows a schematic view of a LED lighting device 130 comprising a LED light source 110.
  • the LED light source 110 may be substantially any light source comprising one or more LEDs (e.g. a LED filament) and that the LED light source 110 shown in Fig. 1 is shown as an example.
  • the LED lighting device 130 further comprises a cover 120, wherein the cover 120 is arranged to at least partially enclose the LED light source 110.
  • the cover 120 is an enclosing element, such as a cap, bulb, envelope, or the like, comprising an at least partially translucent and/or transparent material.
  • the at least partially translucent and/or transparent material may be glass or plastic or a combination of the two.
  • the cover 120 is a bulb comprising glass.
  • the LED lighting device 130 further comprises a coating 100, wherein the coating comprises cerium-doped holmium oxide.
  • the coating 100 further comprises a binding agent which is used for adhering the coating to the cover 120.
  • the coating 100 is adhered on at least a part of the inside surface of the cover 120.
  • the coating 100 may be applied to the cover by spraying methods. The spraying method is even more effective if the binding agent is an electrostatic powder and the coating 100 is substantially a powder.
  • the coating 100 may be on the outside and/or the inside of the cover 120.
  • the coating 100 may be on both the inside and outside of the cover 120, concurrently.
  • the coating 100 may partially or completely cover any surface of the cover 120.
  • the thickness of the coating 100 may vary, or be homogenous, over the surface of the cover 120, on which it is adhered.
  • the materials in the coating 100 is relatively inexpensive. More specifically, the cerium-doped holmium oxide in the coating 100 has a lower, or even significantly lower, price per weight (kilogram).
  • the coating 100 provides a plurality of positive effects when used in conjunction with a LED lighting device 130.
  • the emitted light via the cover 120 and hence the coating 100, may comprise more sought-after wavelengths, namely the emitted light may comprise less blue light than if the coating 100 would not be used.
  • the coating 100 may focus on transmitting light with a wavelength above approximately 500 nm.
  • Another positive effect of the coating 100 used in Fig. 1 is that the emitted light is diffused, to at least provide a more pleasing light.
  • Fig. 1 Another positive effect of the coating 100 used in Fig. 1 is that the emitted light is diffused, to at least provide a more pleasing light.
  • the light emitted by the LED lighting device 130 i.e. the light emitted by the LED light source 100 which is transmitted via the coating 100 and cover 120, may be more decorative and aesthetically pleasing, at a less expensive price. Furthermore, in Fig. 1, the optical efficiency of the LED lighting device 130 is high when the coating 100 is adhered to the cover 120, even up to 100%.
  • Fig. 2a-2b shows schematic views of a tubular shaped LED lighting device 130 (e g. a TLED device).
  • the LED lighting device 130 comprises a LED light source 110.
  • the LED lighting device 130 further comprises a cover 120, wherein the cover 120 is arranged to at least partially enclose the LED light source 110.
  • the cover 120 has a tubular shape.
  • the LED lighting device 130 further comprises a coating 100, wherein the coating 100 is adhered on the inside of the cover 120, i.e. on the side of the cover facing the LED light source 110.
  • the optical efficiency of the LED lighting device 130, when the coating 100 is adhered to the cover 120 may be up to 95.5%.
  • Fig. 3 shows a graph illustrating the relation between the wavelength and the relative intensity of the emitted light of a LED lighting device using the coating of the present invention.
  • Fig. 3 shows, on the vertical axis, relative intensity, wherein the relative intensity may be defined as the ratio between the intensity of the light emitted by a light source and the light emitted by a black body light source as a reference.
  • Fig. 3 shows, on the horizontal axis, wavelength in nanometers.
  • the graph shows three different series corresponding to experiments made of the relative intensity at different wavelengths for a LED device using the coating according to the present invention.
  • the three series correspond to a coating with a content of holmium oxide in the coating of 15 wt%, 10 wt% and 0 wt% respectively.
  • the data for each of the three series comprise data from a plurality of experiments using a coating with the respective wt%, and shows an average of the data from those experiments.
  • the black body light output is assumed to be an even line along the 100% line on the vertical axis. Therefore, some data points may show a value higher than 100%.
  • Fig. 3 the difference in relative intensity when using a coating comprising holmium oxide, and a coating not comprising holmium oxide, may be observed when comparing the 0 wt% series and the 10/15 wt% series. Accordingly, it may be observed that the relative intensity is significantly lower in the blue portion, i.e.
  • the relative intensity when using a coating comprising holmium oxide is higher in the green to yellow portions of the spectrum, i.e. the upper end of the spectrum, which may be beneficial since the human eyes are more sensitive to the green and yellow portions of the spectrum.
  • the optical efficiency is improved when using a coating comprising holmium oxide according to the present invention.

Abstract

A coating (100) for a light-emitting diode, LED, lighting device. The coating comprises cerium-doped, Ce, holmium oxide, Ho2O3, wherein the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%. The coating further comprises a binding agent mixed with the cerium-doped holmium oxide, wherein the binding agent is arranged to adhere the coating to at least a portion of the LED lighting device.

Description

COATING FOR LED LIGHTING DEVICE
FIELD OF THE INVENTION
The present invention generally relates to a coating for a LED lighting device.
BACKGROUND OF THE INVENTION
The use of light emitting diodes (LEDs) for illumination purposes continues to attract attention. Compared to incandescent lamps, fluorescent lamps, neon tube lamps, etc., LEDs provide numerous advantages such as a longer operational life, a reduced power consumption, and an increased efficiency related to the ratio between light energy and heat energy.
Over the past years, various ways to modify the emitted light from a lighting device comprising LEDs have been explored. There is an interest in transforming the emitted light from a LED device, by using e.g. different covers, layers and/or coatings in order to achieve a desired lighting effect or profile.
The solutions used today may include the use of different coatings for lighting devices, wherein these coatings comprise diffusor materials (e.g. CaCOi, AI2O3 or SiOi powder) and (remote) phosphors (e.g. Y3AI5O12 or YGasOn) in order to achieve a pleasing lighting profile. However, the material(s) of the coatings of the prior art suffer from an inadequate light efficiency and/or an insufficient aesthetic effect of the light via the coatings. Furthermore, the material(s) of the coatings may be relatively expensive. Furthermore, the combination of the different coating materials may lead to relatively complex coating compositions.
Hence, there is a need for coatings which are able to diffuse the light from a LED lighting device in a more efficient and/or decorative manner, whilst providing non- expensive and less complex coating material(s) for this purpose.
Hence, it is an object of the present invention to provide a coating for diffusing the light emitted from a LED device, in order to provide a more pleasant and decorative lighting, as well as providing a more efficient lighting, whilst using non-expensive coating material(s), and wherein the coating is less complex than the coatings of the prior art.
SUMMARY OF THE INVENTION
Hence, it is of interest to explore the possibility of combining one or more of the numerous advantages of LED lighting devices with a coating comprising holmium oxide, for diffusing the emitted light, thus providing an improved appearance and/or a decorative aspect of the light emitted from the LED lighting device, whilst providing a cost-efficient and convenient coating.
This and other objects are achieved by providing a coating for a LED lighting device as described in the following.
According to a first aspect of the present invention, there is provided a coating for a LED lighting device, comprising cerium-doped, Ce, holmium oxide, HO2O3, wherein the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%, and a binding agent mixed with the cerium-doped holmium oxide, wherein the binding agent is arranged to adhere the coating to at least a portion of the LED lighting device, and wherein the cerium-doped holmium oxide comprises 0.1 - 10 wt% cerium compared to the total cerium-doped holmium oxide, preferably 2 - 6 wt% Ce, more preferably 3 - 5 wt% Ce, most preferably 4 wt% Ce.
According to a second aspect of the present invention, there is provided a method of coating at least a portion of a LED lighting device using a coating according to the first aspect of the present invention.
According to a third aspect of the present invention, there is provided a method of producing a coating for a light-emitting diode, LED, lighting device. The method comprises the steps of: providing cerium-doped, Ce, holmium oxide, HO2O3, wherein the cerium-doped holmium oxide comprises 0.1 - 10 wt% cerium compared to the total cerium- doped holmium oxide, preferably 2 - 6 wt% Ce, more preferably 3 - 5 wt% Ce, most preferably 4 wt% Ce; providing a binding agent; and mixing the cerium-doped holmium oxide and the binding agent to form a mixture, so that the content of cerium-doped holmium oxide is 6 to 88 wt% in the mixture.
Thus, the first, second and third aspects of the present invention are based on the idea of providing a coating for a LED lighting device. The coating comprises cerium- doped holmium oxide and a binding agent, wherein the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%. The coating may provide high optical efficiency for a LED lighting device, and a more aesthetically appealing light effect during operation.
The present invention is advantageous in that the coating may diffuse light emitted by a LED lighting device, and that the optical efficiency when used with a LED lighting device may be improved. By the term “optical efficiency” it is here meant, but not limited to, the ratio of the total luminous flux by a light source to the total radiant flux from the same light source. The luminous flux is the perceived power of the light (as perceived by a human) emitted by the light source, and the radiant flux is total power of all electromagnetic radiation emitted by the light source. For example, when the coating is applied on some LED lighting devices the optical efficiency may be up to 100%. One example is TLED lamps with the coating applied, which may have 95.5% optical efficiency. Another example are LED filament lamps with glass bulbs, which may have up to 100% optical efficiency. The present invention is further advantageous in that the coating reduces blue light, thus providing a more decorative and appealing lighting, as well as a more pleasing light. There are some concerns on blue light hazard to human eyes. With the reduced blue light from the LED lighting device according to present invention, such concerns might be relieved on certain level, in other words, the LED lighting device according to the present invention might be helpful for human being’s eye protection. By the term “blue light” it is here meant, but not limited to, the part of the visible spectrum of light with the shortest wavelengths, i.e. around 380 to 490 nm.
It will be appreciated that the coating may be used as a phosphor and a diffuser. Thus, providing the benefits of both a phosphor and a diffuser at a reduced cost, and in a less complex manner.
It will be appreciated that the method according to the second aspect of the present invention is more (cost-) efficient and/or convenient than the coatings according to the prior art, since the coating according to the first aspect of the present invention may act as a phosphor and as a diffuser.
It will be appreciated that the coating of the present invention is relatively inexpensive to produce. More specifically, the materials used in the coating has a lower, or even significantly lower, price per weight (kilogram) than coating material(s) of the prior art.
It will be further appreciated that the coating provides efficient lighting while being relatively inexpensive to produce.
The coating for a LED lighting device comprises cerium-doped, Ce, holmium oxide, HO2O3. The content of cerium-doped holmium oxide in the coating is 6 to 88 wt%. By the term “wt%” it is here meant the weight percentage. The coating further comprises a binding agent mixed with the cerium-doped holmium oxide. The binding agent is arranged to adhere the coating to at least a portion of the LED lighting device. By the term “adhere” it is here meant, but not limited to, fastening, sticking and/or clinging to. It is to be understood that the coating may be adhered to the LED lighting device such that all, or a part, of the light emitted by the LED lighting device is transmitted by the coating. Furthermore, it is to be understood that the coating may be reflective and/or light transmissive for different wavelengths. For example, the coating may be translucent or transparent for a substantial part of the visible wavelength spectrum. The visible wavelength spectrum is around 380 nm to 700 nm. Furthermore, the coating may for example be at least partially reflective for the part of the visible spectrum of light with the shortest wavelengths, i.e. around 380 to 490 nm.
According to an embodiment of the present invention, the binding agent comprises an electrostatic powder. This is advantageous in that the coating may adhere more efficiently to a LED lighting device. For example, the coating may be adhered to the LED lighting device using spraying methods. The present embodiment is further advantageous in that the process of adhering the coating to a LED lighting device may be done in an efficient and cost-effective manner.
According to an embodiment of the present invention, the binding agent is an acrylic polymer and the coating further comprises demineralized water.
According to an embodiment of the present invention, the coating further comprises at least one of CaCCb, AI2O3 and SiCh. The present embodiment is advantageous in that the diffusion of the emitted light may be more decorative and aesthetically pleasing.
According to an embodiment of the present invention, the content of cerium- doped holmium oxide in the coating is preferably 6 to 70 wt%, more preferably 6 to 50 wt% and even more preferred 6 to 30 wt%. The present embodiment is advantageous in that the optical efficiency of a lighting device using the coating may be improved. Furthermore, this is advantageous in that the production of the coating may be more cost effective, while the coating still provides a high and satisfactory optical efficiency. This is further advantageous in that the coating may reduce the intensity of the blue light in the emitted light, while providing a decorative and aesthetically pleasing emitted light, at a less expensive price.
According to an embodiment of the present invention, the cerium-doped holmium oxide is a powder. This is advantageous in that the coating may be easier to employ. For example, the coating may be adhered more easily to a LED lighting device using spraying methods.
According to an embodiment of the present invention, there is provided a LED lighting device. The LED lighting device may comprise at least one LED light source arranged to emit light. The LED lighting device may further comprise a cover configured to at least partially enclose the at least one LED light source, wherein the cover is configured to at least partially transmit the light emitted by the at least one LED light source. By the term “cover”, it is here meant, but not limited to, an enclosing element, such as a cap, bulb, envelope, or the like, comprising an at least partially translucent and/or transparent material. The LED lighting device may further comprise a coating according to any one of the preceding embodiments of the first aspect of the present invention. The coating may be adhered partially or completely on any surface of the cover. For example, the whole inner surface of the cover may be coated with the coating. In other words, the coating may be adhered on the cover such that all, or part of, the light emitted by the LED light source is transmitted by the coating, thereby allowing the coating to act as a diffuser and phosphor for the LED lighting device.
According to an embodiment of the present invention, there is provided a luminaire. The luminaire may comprise a LED lighting device according to the preceding embodiment of the present invention. The luminaire may be at least one of a tubular LED, a bulb-shaped LED lamp and a LED High Intensity Bulb. According to an embodiment of the third aspect of the present invention, the binding agent comprises an electrostatic powder. This is advantageous in that the produced coating may adhere more efficiently to a LED lighting device. For example, the coating may be adhered to a LED lighting device using spraying methods. The present embodiment is further advantageous in that the process of adhering the produced coating to a LED lighting device may be done in an efficient and cost-effective manner.
According to an embodiment of the third aspect of the present invention, the method further comprises a step of providing water, and the binding agent comprises an acrylic polymer, and wherein the step of mixing comprises mixing the cerium-doped holmium oxide, the binding agent and water.
According to an embodiment of the third aspect of the present invention, the method further comprises a step of providing a compound comprising at least one of CaCCh, AI2O3 and SiC>2, and wherein the mixing comprises mixing the compound, the cerium-doped holmium oxide, the binding agent and when the binding agent comprises an acrylic polymer, water. The present embodiment is advantageous in that the produced coating may have an improved diffusion of the emitted light, for example the emitted light may be more decorative and aesthetically pleasing.
According to an embodiment of the third aspect of the present invention, the step of mixing is performed so that the content of cerium-doped holmium oxide is preferably 6 to 70 wt%, more preferably 6 to 50 wt% and even more preferred 6 to 30 wt% in the mixture. The present embodiment is advantageous in that the produced coating may have an improved optical efficiency. Furthermore, this is advantageous in that the production of the coating may be more cost effective, while the produced coating still provides a high and satisfactory optical efficiency. This is further advantageous in that the produced coating may reduce the intensity of the blue light in the emitted light, while providing a decorative and aesthetically pleasing emitted light, at a cheaper price.
According to an embodiment of the third aspect of the present invention, the cerium-doped holmium oxide is a powder This is advantageous in that the produced coating may be easier to employ. For example, the produced coating may be adhered more easily to a LED lighting device using spraying methods.
Further objectives of, features of, and advantages with, the present invention will become apparent when studying the following detailed disclosure, the drawings and the appended claims. Those skilled in the art will realize that different features of the present invention can be combined to create embodiments other than those described in the following.
BRIEF DESCRIPTION OF THE DRAWINGS
This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention. Fig. 1 shows a schematic view of a LED lighting device with a coating according to exemplifying embodiments of the present invention.
Fig. 2a shows a schematic top-view of a tubular shaped LED lighting device with a coating according to exemplifying embodiments of the present invention.
Fig. 2a shows a schematic side-view of a tubular shaped LED lighting device with a coating according to exemplifying embodiments of the present invention.
Fig. 3 shows a graph illustrating the relation between the wavelength and the optical efficiency of the emitted light of a LED lighting device using the coating according to exemplifying embodiments of the present invention.
DETAILED DESCRIPTION
Fig. 1 shows a schematic view of a LED lighting device 130 comprising a LED light source 110. It should be noted that the LED light source 110 may be substantially any light source comprising one or more LEDs (e.g. a LED filament) and that the LED light source 110 shown in Fig. 1 is shown as an example. The LED lighting device 130 further comprises a cover 120, wherein the cover 120 is arranged to at least partially enclose the LED light source 110. The cover 120 is an enclosing element, such as a cap, bulb, envelope, or the like, comprising an at least partially translucent and/or transparent material. The at least partially translucent and/or transparent material may be glass or plastic or a combination of the two. In Fig. 1, the cover 120 is a bulb comprising glass. The LED lighting device 130 further comprises a coating 100, wherein the coating comprises cerium-doped holmium oxide. The coating 100 further comprises a binding agent which is used for adhering the coating to the cover 120. The coating 100 is adhered on at least a part of the inside surface of the cover 120. The coating 100 may be applied to the cover by spraying methods. The spraying method is even more effective if the binding agent is an electrostatic powder and the coating 100 is substantially a powder. It is to be understood that the coating 100 may be on the outside and/or the inside of the cover 120. For example, the coating 100 may be on both the inside and outside of the cover 120, concurrently. Furthermore, it is to be understood that the coating 100 may partially or completely cover any surface of the cover 120. The thickness of the coating 100 may vary, or be homogenous, over the surface of the cover 120, on which it is adhered.
It will be appreciated that the materials in the coating 100 is relatively inexpensive. More specifically, the cerium-doped holmium oxide in the coating 100 has a lower, or even significantly lower, price per weight (kilogram). The coating 100 provides a plurality of positive effects when used in conjunction with a LED lighting device 130. For example, the emitted light, via the cover 120 and hence the coating 100, may comprise more sought-after wavelengths, namely the emitted light may comprise less blue light than if the coating 100 would not be used. In other words, the coating 100 may focus on transmitting light with a wavelength above approximately 500 nm. Another positive effect of the coating 100 used in Fig. 1 is that the emitted light is diffused, to at least provide a more pleasing light. In Fig. 1, the light emitted by the LED lighting device 130, i.e. the light emitted by the LED light source 100 which is transmitted via the coating 100 and cover 120, may be more decorative and aesthetically pleasing, at a less expensive price. Furthermore, in Fig. 1, the optical efficiency of the LED lighting device 130 is high when the coating 100 is adhered to the cover 120, even up to 100%.
Fig. 2a-2b shows schematic views of a tubular shaped LED lighting device 130 (e g. a TLED device). The LED lighting device 130 comprises a LED light source 110. The LED lighting device 130 further comprises a cover 120, wherein the cover 120 is arranged to at least partially enclose the LED light source 110. In Fig. 2a-2b, the cover 120 has a tubular shape. The LED lighting device 130 further comprises a coating 100, wherein the coating 100 is adhered on the inside of the cover 120, i.e. on the side of the cover facing the LED light source 110. In Fig. 2, the optical efficiency of the LED lighting device 130, when the coating 100 is adhered to the cover 120, may be up to 95.5%.
Fig. 3 shows a graph illustrating the relation between the wavelength and the relative intensity of the emitted light of a LED lighting device using the coating of the present invention. Fig. 3 shows, on the vertical axis, relative intensity, wherein the relative intensity may be defined as the ratio between the intensity of the light emitted by a light source and the light emitted by a black body light source as a reference. Fig. 3 shows, on the horizontal axis, wavelength in nanometers. The graph shows three different series corresponding to experiments made of the relative intensity at different wavelengths for a LED device using the coating according to the present invention. The three series correspond to a coating with a content of holmium oxide in the coating of 15 wt%, 10 wt% and 0 wt% respectively. The data for each of the three series comprise data from a plurality of experiments using a coating with the respective wt%, and shows an average of the data from those experiments. The black body light output is assumed to be an even line along the 100% line on the vertical axis. Therefore, some data points may show a value higher than 100%. In Fig. 3, the difference in relative intensity when using a coating comprising holmium oxide, and a coating not comprising holmium oxide, may be observed when comparing the 0 wt% series and the 10/15 wt% series. Accordingly, it may be observed that the relative intensity is significantly lower in the blue portion, i.e. the lower end of the spectrum, when the LED lighting device is coated with a coating of the present application, compared to when the LED lighting device is coated with a coating which does not comprise any holmium oxide. Furthermore, it may be observed that the relative intensity when using a coating comprising holmium oxide is higher in the green to yellow portions of the spectrum, i.e. the upper end of the spectrum, which may be beneficial since the human eyes are more sensitive to the green and yellow portions of the spectrum. Thus, it may be clear from observing Fig. 3 and the difference in relative intensity between using a coating comprising holmium oxide, and using a coating not comprising holmium oxide, that the optical efficiency is improved when using a coating comprising holmium oxide according to the present invention.

Claims

9 CLAIMS
1. A coating (100) for a light-emitting diode, LED, lighting device, comprising: cerium-doped holmium oxide, wherein the content of cerium-doped holmium oxide in the coating is 6 to 88 wt%, and a binding agent mixed with the cerium-doped holmium oxide, wherein the binding agent is arranged to adhere the coating to at least a portion of the LED lighting device, and wherein the cerium-doped holmium oxide comprises 0.1 - 10 wt% cerium compared to the total cerium-doped holmium oxide.
2. The coating according to claim 1, wherein the binding agent comprises an electrostatic powder.
3. The coating according to claim 1, wherein the binding agent is an acrylic polymer and the coating further comprises demineralized water.
4. The coating according to any one of claims 1 to 3, wherein the coating further comprises at least one of CaCCb, AI2O3 and SiCL.
5. The coating according to any one of claims 1 to 4, wherein the content of cerium-doped holmium oxide in the coating is preferably 6 to 70 wt%, more preferably 6 to 50 wt% and even more preferred 6 to 30 wt%.
6. The coating according to any one of claims 1 to 5, wherein the cerium-doped holmium oxide is a powder.
7. A light-emitting diode, LED, lighting device (130), comprising: at least one LED light source (110) arranged to emit light, a cover (120) configured to at least partially enclose the at least one LED light source, and wherein the cover is configured to at least partially transmit the light emitted by the at least one LED light source, and a coating according to any one of claims 1 to 6, wherein the coating is arranged to at least partially coat the cover, and wherein the coating is configured to diffuse the light emitted by the at least one LED light source and transmitted by the cover.
8. A luminaire comprising a LED lighting device according to claim 7, wherein the luminaire is at least one of a tubular LED, a bulb-shaped LED lamp and a LED High Intensity Bulb.
9. A method of producing a coating for a light-emitting diode, LED, lighting device, wherein the method comprises the steps of: providing cerium-doped holmium oxide, wherein the cerium-doped holmium oxide comprises 0.1 - 10 wt% cerium compared to the total cerium-doped holmium oxide, providing a binding agent, mixing the cerium-doped holmium oxide and the binding agent to form a mixture, so that the content of cerium-doped holmium oxide is 6 to 88 wt% in the mixture.
10. The method according to claim 9, wherein the binding agent comprises an electrostatic powder.
11. The method according to claim 9, wherein the method further comprises a step of providing water, and the binding agent comprises an acrylic polymer, and wherein the step of mixing comprises mixing the cerium-doped holmium oxide, the binding agent and water.
12. The method according to claim 9 to 11, wherein the method further comprises a step of providing a compound comprising at least one of CaCCL, AI2O3 and SiCh, and wherein the mixing comprises mixing the compound, the cerium-doped holmium oxide, the binding agent and water.
13. The method according to any one of claims 9 to 12, wherein the step of mixing is performed so that the content of cerium-doped holmium oxide is preferably 6 to 70 wt%, more preferably 6 to 50 wt% and even more preferred 6 to 30 wt% in the mixture.
14. The method according to any one of claims 9 to 13, wherein the cerium-doped holmium oxide is a powder.
PCT/EP2022/051468 2021-02-05 2022-01-24 Coating for led lighting device WO2022167244A1 (en)

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JP2002208376A (en) * 2000-11-13 2002-07-26 Toshiba Lighting & Technology Corp Metal halide lamp and illumination device
WO2007130779A1 (en) * 2006-05-03 2007-11-15 3M Innovative Properties Company Led extractor composed of high index glass
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