# US 8,785,964 B2 · Panel light comprising a light-emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,964 B2 - Document ID: US8785964B2 - Status: Granted - Kind: B2 - Application number: 12/435,491 - Filed: 2009-05-05 - Published: 2009-09-03 - Granted: 2014-07-22 - Earliest claimed: 2002-12-26 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Satoko Shitagaki; Satoshi Seo; Takeshi Nishi - Inventors: Satoko Shitagaki; Satoshi Seo; Takeshi Nishi - Web page: https://patentgrep.com/patent/US8785964B2 ## CPC - H05B 33/04: Sealing arrangements {, e.g. against humidity} - H05B 33/20: characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded - H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers} - H10K 59/8722: {Peripheral sealing arrangements, e.g. adhesives, sealants} - H10K 59/874: {including getter material or desiccant} - H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers} - H10K 59/875: {Arrangements for extracting light from the devices} - H10K 2102/3026: {Top emission} - H10K 2102/3031: {Two-side emission, e.g. transparent OLEDs [TOLED]} - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract In a sealing method of a top-emission organic light emitting element, in the case of using a method of filling with a sealing agent between a substrate mounted with pixels and an opposed substrate, the organic light-emitting element is degraded by ultraviolet rays when irradiation of the ultraviolet rays is performed toward the pixels in order to achieve ultraviolet curing of the sealing agent filling on the pixels. It is an object of the present invention to propose a method for avoiding this phenomenon to provide an organic light-emitting device with superior stability. In order for a sealing agent 13 filling on a pixel portion 14 to have a larger absorbance to ultraviolet rays, an ultraviolet-absorbent material is dispersed in a sealing agent to make an adjustment so that the absorbance of ultraviolet absorption wavelength of 400 nm or less becomes 1 or more. ## Claims ### Claim 1 A panel light comprising: a light-emitting device, the light-emitting device comprising: a first substrate; a transparent second substrate; and an organic light-emitting element between the first substrate and the transparent second substrate, the organic light-emitting element comprising: a first electrode over an insulating surface of the first substrate; an organic light-emitting layer over the first electrode, the organic light-emitting layer comprising an electroluminescent organic compound; and a transparent second electrode over the organic light-emitting layer; wherein a first sealing agent is provided at a periphery of the light-emitting device, wherein a second sealing agent comprising an ultraviolet curable resin and an ultraviolet absorbent is filled between the transparent second electrode and the transparent second substrate, wherein the first sealing agent is selected from a material having a higher viscosity than the second sealing agent, wherein the ultraviolet absorbent is dispersed in the ultraviolet curable resin, wherein the second sealing agent has an absorbance of 1 or more to a wavelength of ultraviolet rays irradiated for curing the ultraviolet curable resin, and wherein the first sealing agent comprises an opening. ### Claim 2 (depends on 1) The panel light according to claim 1, wherein the first sealing agent further comprises three openings. ### Claim 3 (depends on 1) The panel light according to claim 1, wherein a thickness of the transparent second electrode is in a range of 1 nm to 10 nm. ### Claim 4 (depends on 1) The panel light according to claim 1, wherein the first sealing agent comprises a filler whose diameter is a range of 6 μm to 24 μm. ### Claim 5 (depends on 1) The panel light according to claim 1, wherein the second sealing agent is located between the organic light-emitting element and the first sealing agent. ### Claim 6 A panel light comprising: a light-emitting device; the light-emitting device comprising: a first substrate, a transparent second substrate, and an organic light-emitting element of a sequential lamination of a first electrode provided in contact with an insulating surface of the first substrate, an organic light-emitting layer provided in contact with the first electrode and including an electroluminescent organic compound, and a transparent second electrode provided in contact with the organic light-emitting layer, the organic light-emitting element being provided between the first substrate and the transparent second substrate, wherein a first sealing agent is provided at a periphery of the light-emitting device, wherein a second sealing agent comprising an ultraviolet curable resin and an ultraviolet absorbent is filled between the transparent second electrode and the transparent second substrate, wherein the first sealing agent is selected from a material having a higher viscosity than the second sealing agent, wherein the ultraviolet absorbent is dispersed in the ultraviolet curable resin, wherein the second sealing agent has an absorbance of 1 or more to a wavelength of ultraviolet rays irradiated for curing the ultraviolet curable resin, wherein a thickness of the transparent second electrode is in a range of 1 nm to 10 nm, and wherein the first sealing agent comprises an opening. ### Claim 7 (depends on 6) The panel light according to claim 6, wherein the ultraviolet absorbent is moisture-adsorbent. ### Claim 8 (depends on 7) The panel light according to claim 7, wherein the ultraviolet absorbent has a material that absorbs a wavelength region of the ultraviolet rays, which is supported on a porous body. ### Claim 9 (depends on 8) The panel light according to claim 8, wherein the porous body is zeolite. ### Claim 10 (depends on 6) The panel light according to claim 6, wherein the wavelength of the ultraviolet rays is 200 nm or more and 400 nm or less. ### Claim 11 (depends on 6) The panel light according to claim 6, wherein the ultraviolet absorbent is oxygen-absorbent. ### Claim 12 (depends on 6) The panel light according to claim 6, wherein the ultraviolet absorbent is selected from the group consisting of benzotriazole-based, benzophenone-based, and salicylate-based compounds. ### Claim 13 (depends on 6) The panel light according to claim 6, wherein the second sealing agent is located between the organic light-emitting element and the first sealing agent. ### Claim 14 A panel light comprising a light-emitting device: the light-emitting device comprising: a first substrate; a transparent second substrate; and an organic light-emitting element between the first substrate and the transparent second substrate, the organic light-emitting element comprising: a first electrode over an insulating surface of the first substrate; an organic light-emitting layer over the first electrode, the organic light-emitting layer comprising an electroluminescent organic compound; and a transparent second electrode over the organic light-emitting layer; wherein a first sealing agent is provided at a periphery of the light-emitting device, wherein a second sealing agent comprising an ultraviolet curable resin and an ultraviolet absorbent is filled between the transparent second electrode and the transparent second substrate, wherein the first sealing agent is selected from a material having a higher viscosity than the second sealing agent, wherein the ultraviolet absorbent is dispersed in the ultraviolet curable resin, wherein the second sealing agent has an absorbance of 1 or more to a wavelength of ultraviolet rays irradiated for curing the ultraviolet curable resin, wherein a thickness of the transparent second electrode is in a range of 1 nm to 10 nm, and wherein the first sealing agent comprises an opening. ### Claim 15 (depends on 14) The panel light according to claim 14, wherein the ultraviolet absorbent is moisture-adsorbent. ### Claim 16 (depends on 15) The panel light according to claim 15, wherein the ultraviolet absorbent has a material that absorbs a wavelength region of the ultraviolet rays, which is supported on a porous body. ### Claim 17 (depends on 16) The panel light according to claim 16, wherein the porous body is zeolite. ### Claim 18 (depends on 14) The panel light according to claim 14, wherein the wavelength of the ultraviolet rays is 200 nm or more and 400 nm or less. ### Claim 19 (depends on 14) The panel light according to claim 14, wherein the ultraviolet absorbent is oxygen-absorbent. ### Claim 20 (depends on 14) The panel light according to claim 14, wherein the ultraviolet absorbent is selected from the group consisting of benzotriazole-based, benzophenone-based, and salicylate-based compounds. ### Claim 21 (depends on 14) The panel light according to claim 14, wherein the second sealing agent is located between the organic light-emitting element and the first sealing agent.