# US 12,010,861 B2 · Light-emitting element, light-emitting device, display device, lighting device, and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,861 B2 - Document ID: US12010861B2 - Status: Granted - Kind: B2 - Application number: 16/593,215 - Filed: 2019-10-04 - Published: 2020-01-30 - Granted: 2024-06-11 - Earliest claimed: 2013-05-17 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Satoko Shitagaki; Takahiro Ishisone; Satoshi Seo; Takeyoshi Watabe - Web page: https://patentgrep.com/patent/US12010861B2 ## CPC - H10K 50/121: {for assisting energy transfer, e.g. sensitization} - H10K 50/14: Carrier transporting layers - H10K 50/16: Electron transporting layers - H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene} - H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)} - H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole} - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract Provided is a light-emitting element which has an anode, a light-emitting layer over the anode, an electron-transport layer over and in contact with the light-emitting layer, an electron-injection layer over and in contact with the electron-transport layer, and a cathode over and in contact with the electron-injection layer. The light-emitting layer has an electron-transport property, and the electron-transport layer includes an anthracene derivative. The light-emitting layer further includes a phosphorescent substance. This device structure allows the formation of a highly efficient blue-emissive light-emitting element even though the phosphorescent substance has higher triplet energy than the anthracene derivative which directly contacts with the light-emitting layer. ## Claims ### Claim 1 A light-emitting device comprising: an anode; a light-emitting layer over the anode, the light-emitting layer comprising a first substance and a phosphorescent substance; an electron-transport layer over and in contact with the light-emitting layer, the electron-transport layer comprising a first organic compound; a first layer over and in contact with the electron-transport layer, the first layer comprising a second organic compound; and a cathode over the first layer, wherein the first organic compound has an anthracene skeleton, wherein at least two phenyl groups are bonded to the anthracene skeleton in the first organic compound, wherein the second organic compound comprises a phenanthroline skeleton, wherein the first organic compound has lower triplet excitation energy than the phosphorescent substance, and wherein the first organic compound has a deeper LUMO level than the second organic compound. ### Claim 2 (depends on 1) The light-emitting device according to claim 1, wherein the first organic compound has lower triplet excitation energy than the first substance. ### Claim 3 (depends on 1) The light-emitting device according to claim 1, wherein the first substance is a π-electron deficient heteroaromatic compound. ### Claim 4 (depends on 3) The light-emitting device according to claim 3, wherein the π-electron deficient heteroaromatic compound has one of a polyazole skeleton, a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a pyrimidine skeleton, a pyrazine skeleton and a pyridine skeleton. ### Claim 5 (depends on 1) The light-emitting device according to claim 1, wherein the light-emitting layer further comprising a second substance, and wherein the first substance has a bicarbazole skeleton. ### Claim 6 (depends on 5) The light-emitting device according to claim 5, wherein the second substance is a heterocyclic aromatic compound. ### Claim 7 (depends on 1) The light-emitting device according to claim 1, further comprising a second layer over the first layer, wherein the second layer comprises a substance comprising a fluorine atom. ### Claim 8 (depends on 1) The light-emitting device according to claim 1, wherein the first organic compound further has a carbazole skeleton or a dibenzo[c,g]carbazole skeleton. ### Claim 9 (depends on 1) The light-emitting device according to claim 1, wherein the anthracene skeleton is included in a 9,10-diphenylanthracene unit, and wherein the 9,10-diphenylanthracene unit bonds to one of a carbazole skeleton and a dibenzo[c,g]carbazole skeleton. ### Claim 10 (depends on 1) The light-emitting device according to claim 1, wherein the phosphorescent substance is capable of emitting phosphorescence with a peak in a rage from 420 nm to 530 nm. ### Claim 11 (depends on 1) An electronic device comprising the light-emitting device according to claim 1. ### Claim 12 (depends on 1) The light-emitting device according to claim 1, wherein the anthracene skeleton in the first organic compound is included in a 9,10-diphenylanthracene unit. ### Claim 13 (depends on 1) The light-emitting device according to claim 1, wherein the electron-transport layer is a layer of the first organic compound. ### Claim 14 A light-emitting device comprising: an anode; a light-emitting layer over the anode, the light-emitting layer comprising a first substance, a second substance and a phosphorescent substance; an electron-transport layer over and in contact with the light-emitting layer, the electron-transport layer comprising a first organic compound; a first layer over and in contact with the electron-transport layer, the first layer comprising a second organic compound; and a cathode over the first layer, wherein the second substance is a heteroaromatic compound, wherein the first organic compound has an anthracene skeleton, wherein at least two phenyl groups are bonded to the anthracene skeleton in the first organic compound, wherein the second organic compound comprises a phenanthroline skeleton, wherein the first organic compound has lower triplet excitation energy than the phosphorescent substance, and wherein the first organic compound has a deeper LUMO level than the second organic compound. ### Claim 15 (depends on 14) The light-emitting device according to claim 14, wherein the first organic compound has lower triplet excitation energy than the first substance and the second substance. ### Claim 16 (depends on 14) The light-emitting device according to claim 14, wherein the heteroaromatic compound has one of a polyazole skeleton, a quinoxaline skeleton, a dibenzoquinoxaline skeleton, a pyrimidine skeleton, a pyrazine skeleton and a pyridine skeleton. ### Claim 17 (depends on 14) The light-emitting device according to claim 14, wherein the first substance has a bicarbazole skeleton. ### Claim 18 (depends on 14) The light-emitting device according to claim 14, further comprising a second layer over the first layer, wherein the second layer comprises a substance comprising a fluorine atom. ### Claim 19 (depends on 14) The light-emitting device according to claim 14, wherein the first organic compound further has a carbazole skeleton or a dibenzo[c,g] carbazole skeleton. ### Claim 20 (depends on 14) The light-emitting device according to claim 14, wherein the anthracene skeleton is included in a 9,10-diphenylanthracene unit, and wherein the 9,10-diphenylanthracene unit bonds to one of a carbazole skeleton and a dibenzo[c,g]carbazole skeleton. ### Claim 21 (depends on 14) The light-emitting device according to claim 14, wherein the phosphorescent substance is capable of emitting phosphorescence with a peak in a rage from 420 nm to 530 nm. ### Claim 22 (depends on 14) An electronic device comprising the light-emitting device according to claim 14. ### Claim 23 (depends on 14) The light-emitting device according to claim 14, wherein the anthracene skeleton in the first organic compound is included in a 9,10-diphenylanthracene unit. ### Claim 24 (depends on 14) The light-emitting device according to claim 14, wherein the electron-transport layer is a layer of the first organic compound.