# US 8,786,184 B2 · Organic light-emitting element and light-emitting device with the organic light-emitting element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,184 B2 - Document ID: US8786184B2 - Status: Granted - Kind: B2 - Application number: 14/090,721 - Filed: 2013-11-26 - Published: 2014-04-17 - Granted: 2014-07-22 - Earliest claimed: 2002-12-26 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Hiroko Yamazaki; Satoshi Seo - Web page: https://patentgrep.com/patent/US8786184B2 ## CPC - H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light - H10H 20/8512: {Wavelength conversion materials} - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 50/121: {for assisting energy transfer, e.g. sensitization} - H10K 50/131: {with spacer layers between the electroluminescent layers} - H10K 50/15: Hole transporting layers - H10K 50/16: Electron transporting layers - H10K 50/171: {Electron injection layers} - H10K 59/30: Devices specially adapted for multicolour light emission - H10K 59/80524: {Transparent cathodes, e.g. comprising thin metal layers} - H10K 50/18: Carrier blocking layers - H10K 85/324: {comprising aluminium, e.g. Alq3} - H10K 85/342: {comprising iridium} - H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene} - H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom} - H10K 2101/10: Triplet emission - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract The present invention provides a white organic light-emitting element high in the emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in the emission efficiency. It is preferable to use an electron transport material between a first emission region and a second emission region and more preferable to use a hole block material. ## Claims ### Claim 1 A light emitting device comprising: a light emitting element comprising: a first electrode over a substrate; an electroluminescent layer over the first electrode, the electroluminescent layer comprising a first emission region and a second emission region over the first emission region; a second electrode over the electroluminescent layer; and an insulator covering an end portion of the first electrode, wherein the second emission region is located apart from the first emission region, wherein the first emission region and the second emission region are overlapped with each other, and wherein at least one of the first emission region and the second emission region comprises a phosphorescent material. ### Claim 2 (depends on 1) The light emitting device according to claim 1, wherein the phosphorescent material is an iridium compound. ### Claim 3 (depends on 1) The light emitting device according to claim 1, wherein a distance between the first emission region and the second emission region ranges from 1 nm to 30 nm. ### Claim 4 (depends on 1) The light emitting device according to claim 1, wherein the first electrode comprises a transparent conductive film. ### Claim 5 (depends on 1) The light emitting device according to claim 1, wherein the one of the first emission region and the second emission region comprises a host material in which the phosphorescent material is dispersed. ### Claim 6 (depends on 1) The light emitting device according to claim 1, wherein the other of the first emission region and the second emission region comprises a fluorescent material. ### Claim 7 (depends on 6) The light emitting device according to claim 6, wherein the other of the first emission region and the second emission region comprises a host material in which the fluorescent material is dispersed. ### Claim 8 (depends on 6) The light emitting device according to claim 6, wherein the phosphorescent material and the fluorescent material are selected so that white emission is obtained from the light emitting element. ### Claim 9 (depends on 1) The light emitting device according to claim 1, further comprising a sealing substrate over the second electrode. ### Claim 10 (depends on 1) An electric appliance comprising the light emitting device according to claim 1. ### Claim 11 A light emitting device comprising: a light emitting element comprising: a first electrode over a substrate; an insulator covering an end portion of the first electrode, an electroluminescent layer over the first electrode and the insulator; and a second electrode over the electroluminescent layer, wherein the electroluminescent layer comprises: a first emission region over the first electrode; and a second emission region over and apart from the first emission region, and wherein at least one of the first emission region and the second emission region comprises a phosphorescent material. ### Claim 12 (depends on 11) The light emitting device according to claim 11, wherein the phosphorescent material is an iridium compound. ### Claim 13 (depends on 11) The light emitting device according to claim 11, wherein a distance between the first emission region and the second emission region ranges from 1 nm to 30 nm. ### Claim 14 (depends on 11) The light emitting device according to claim 11, wherein the first electrode comprises a transparent conductive film. ### Claim 15 (depends on 11) The light emitting device according to claim 11, wherein the one of the first emission region and the second emission region comprises a host material in which the phosphorescent material is dispersed. ### Claim 16 (depends on 11) The light emitting device according to claim 11, wherein the other of the first emission region and the second emission region comprises a fluorescent material. ### Claim 17 (depends on 16) The light emitting device according to claim 16, wherein the other of the first emission region and the second emission region comprises a host material in which the fluorescent material is dispersed. ### Claim 18 (depends on 16) The light emitting device according to claim 16, wherein the phosphorescent material and the fluorescent material are selected so that white emission is obtained from the light emitting element. ### Claim 19 (depends on 11) The light emitting device according to claim 11, further comprising a sealing substrate over the second electrode. ### Claim 20 (depends on 11) An electric appliance comprising the light emitting device according to claim 11.