# US 11,441,757 B2 · Light conversion devices and lighting devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,757 B2 - Document ID: US11441757B2 - Status: Granted - Kind: B2 - Application number: 16/989,663 - Filed: 2020-08-10 - Published: 2021-02-25 - Granted: 2022-09-13 - Earliest claimed: 2019-08-09 - Assignees: Schott AG - Applicants: Schott AG - Inventors: Frank Gindele; Edgar Pawlowski; Christian Rakobrandt; Christoph Stangl; Thorsten Damm - Web page: https://patentgrep.com/patent/US11441757B2 ## CPC - F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) - C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances - F21V 7/30: the coatings comprising photoluminescent substances - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, 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 (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract Light conversion devices and lighting devices having such conversion devices are provided. The conversion device includes a light conversion element having a front side and a coating arrangement. The front side is configured to be illuminated with primary light and to emit secondary light having another wavelength or a wavelength range. The coating arrangement is on the front side and has at least one coating layer. ## Claims ### Claim 1 A light conversion device, comprising: a light conversion element having a front side; and a coating arrangement on the front side, the coating arrangement having at least one coating layer, wherein the light conversion element is configured, on the front side, to be illuminated with primary light and, on the front side, to emit secondary light having another wavelength or a wavelength range from the primary light, wherein the light conversion device has a differing degree of reflectance depending on a direction of an incident beam of the primary light or an emitted beam of the secondary light, and wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light in a range from 60 degrees to a normal line at a wavelength of 440 nm to 460 nm is at most half as large as the degree of reflectance in the wavelength range between 500 to 700 nm. ### Claim 2 (depends on 1) The light conversion device of claim 1, wherein the differing degree of reflectance is a function of a wavelength of the primary or secondary light. ### Claim 3 (depends on 1) The light conversion device of claim 1, wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light of 60 degrees to a normal line deviates on average by at least a factor of two from a degree of reflectance for the angle of incidence of 30 degrees or less to the normal line. ### Claim 4 (depends on 1) The light conversion device of claim 1, wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light of 30 degrees or less to a normal line at a wavelength of 450 nm is at least twice as large as the degree of reflectance in the wavelength range between 500 to 700 nm. ### Claim 5 (depends on 1) The light conversion device of claim 1, wherein the front side is configured convert the primary light that is blue to the secondary light that is white. ### Claim 6 (depends on 1) The light conversion device of claim 1, wherein the at least one coating layer comprises a material selected from a group consisting of SiO2, TiO2, Al2O3, and any combinations thereof. ### Claim 7 (depends on 1) The light conversion device of claim 1, wherein the at least one coating layer comprises a plurality of coating layers. ### Claim 8 (depends on 7) The light conversion device of claim 7, wherein the plurality of coating layers comprises layers of different materials and one layer comprising a material selected from a group consisting of SiO2, TiO2, Al2O3, and any combinations thereof. ### Claim 9 (depends on 1) The light conversion device of claim 1, wherein the at least one coating layer has a thickness of at least 10 nm and at most 120 nm, and wherein the coating arrangement has a total thickness of at least 80 nm and at most 500 nm. ### Claim 10 (depends on 1) The light conversion device of claim 1, wherein the at least one coating layer completely covers the front side. ### Claim 11 (depends on 1) The light conversion device of claim 1, further comprising a base body having a cooling element, wherein the base body is on a back side of the light conversion element. ### Claim 12 A lighting device, comprising: a light conversion device having a light conversion element and a coating arrangement on a front side of the light conversion element; and a light emitting unit configured to emit primary light on front side of the light conversion element, wherein the light conversion element is configured to emit secondary light from the wavelength having another wavelength or a wavelength range from the primary light, wherein the coating arrangement has at least one coating layer, wherein the light conversion device has a differing degree of reflectance depending on a direction of an incident beam of the primary light or an emitted beam of the secondary light, and wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light in a range from 60 degrees to a normal line at a wavelength of 440 nm to 460 nm is at most half as large as the degree of reflectance in the wavelength range between 500 to 700 nm. ### Claim 13 (depends on 12) The lighting device of claim 12, further comprising an optics downstream of the light conversion element that captures and emits the secondary light. ### Claim 14 (depends on 12) The lighting device of claim 12, wherein the light emitting unit comprises a device selected from a group consisting of a laser light source that emits the primary light, a light guide that emits the primary light, a fiber optic light guide that emits the primary light, a lens that emits the primary light, and any combinations thereof. ### Claim 15 (depends on 12) The lighting device of claim 12, wherein the light emitting unit emits the primary light along an optical axis that, in relation to an axis of a normal line to the light conversion element and/or in relation to an optical axis of the secondary light, has an angle of greater than 30 degrees with a scattering range around the optical axis of ±5 degrees. ### Claim 16 (depends on 12) The lighting device of claim 12, wherein the light emitting unit emits the primary light as a bundled primary light with a wavelength between 440 nm to 460 nm and the light conversion element emits the secondary light with a wavelength range in a visible light region. ### Claim 17 (depends on 12) The lighting device of claim 12, wherein the secondary light, in in a hot operating state of the lighting device, lies in an ECE range. ### Claim 18 A method for producing a light conversion device, comprising: providing a base body on a back side of a light conversion element; and coating a front side of the light conversion element with at least one coating layer in such a manner that light of a specific wavelength, irradiated along an optical axis onto the front side of the light conversion device has a first degree of reflectance and in such a manner that light of another wavelength or of a wavelength range irradiated along the optical axis onto the front side has a second degree of reflectance, wherein the light conversion device has a differing degree of reflectance depending on a direction of an incident beam of the primary light or an emitted beam of the secondary light, and wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light in a range from 60 degrees to a normal line at a wavelength of 440 nm to 460 nm is at most half as large as the degree of reflectance in the wavelength range between 500 to 700 nm.