# US 2017/0288154 A1 · Light-emitting element, light-emitting device, electronic device, and lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288154 A1 - Document ID: US20170288154A1 - Status: Published application - Kind: A1 - Application number: 15/471,017 - Filed: 2017-03-28 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Satoshi SEO; Hideko INOUE; Miki KURIHARA; Yui YAMADA; Tatsuyoshi TAKAHASHI; Hiromitsu KIDO - Web page: https://patentgrep.com/patent/US20170288154A1 ## CPC - H10K 85/342: {comprising iridium} - C07F 15/0033: {Iridium compounds} - C07F 15/004: {without a metal-carbon linkage} - C09K 11/06: containing organic luminescent materials - H10K 50/11: characterised by the electroluminescent [EL] layers - C09K 2211/1007: Non-condensed systems - C09K 2211/1044: containing two nitrogen atoms as heteroatoms - C09K 2211/1059: containing three nitrogen atoms as heteroatoms - C09K 2211/185: of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd - H10K 2101/10: Triplet emission - H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values - H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A novel organometallic complex with high reliability is provided. A light-emitting element includes an EL layer between a pair of electrodes. The EL layer includes at least a light-emitting layer. The light-emitting layer contains an organometallic complex. The organometallic complex includes a first ligand and a second ligand which are coordinated to a central metal. The HOMO is distributed over the first ligand, and the LUMO is distributed over the second ligand. The first ligand and the second ligand are cyclometalated ligands. ## Claims ### Claim 1 A light-emitting element comprising an EL layer between a pair of electrodes, wherein the EL layer includes at least a light-emitting layer, wherein the light-emitting layer includes an organometallic complex, wherein the organometallic complex includes a first ligand and a second ligand coordinated to a central metal, wherein the first ligand has a HOMO and the second ligand has a LUMO, and wherein the first ligand and the second ligand are cyclometalated ligands. ### Claim 2 (depends on 1) The light-emitting element according to claim 1, wherein a first heteroaromatic ring coordinated to the central metal and included in the first ligand is different from a second heteroaromatic ring coordinated to the central metal and included in the second ligand. ### Claim 3 (depends on 2) The light-emitting element according to claim 2, wherein the first heteroaromatic ring includes a first monocyclic ring containing a nitrogen atom coordinated to the central metal, wherein the second heteroaromatic ring includes a second monocyclic ring containing a nitrogen atom coordinated to the central metal, and wherein the first monocyclic ring is different from the second monocyclic ring. ### Claim 4 (depends on 3) The light-emitting element according to claim 3, wherein the number of members in each of the first monocyclic ring and the second monocyclic ring is 5 or 6. ### Claim 5 (depends on 3) The light-emitting element according to claim 3, wherein the number of the nitrogen atom in the first monocyclic ring is 1 and the number of the nitrogen atom in the second monocyclic ring is 2 or 3. ### Claim 6 (depends on 3) The light-emitting element according to claim 3, wherein the first monocyclic ring is a pyridine ring, and wherein the second monocyclic ring is a pyrimidine ring or a triazine ring. ### Claim 7 (depends on 3) The light-emitting element according to claim 3, wherein the first heteroaromatic ring is a pyridine ring, and wherein the second heteroaromatic ring is a pyrimidine ring or a triazine ring. ### Claim 8 (depends on 1) The light-emitting element according to claim 1, wherein the central metal is iridium. ### Claim 9 (depends on 1) A light-emitting device comprising a transistor or a substrate, and the light-emitting element according to claim 1. ### Claim 10 (depends on 9) An electronic device comprising a microphone, a camera, an operation button, an external connection portion or a speaker, and the light-emitting device according to claim 9. ### Claim 11 (depends on 9) An electronic device comprising a housing or a touch sensor, and the light-emitting device according to claim 9. ### Claim 12 (depends on 1) A lighting device comprising a transistor or a substrate, and the light-emitting element according to claim 1. ### Claim 13 A light-emitting element comprising an EL layer between a pair of electrodes, wherein the EL layer includes at least a light-emitting layer, wherein the light-emitting layer includes an organometallic complex, wherein the organometallic complex includes a first ligand and a second ligand coordinated to a central metal, wherein a HOMO is distributed over the first ligand and a LUMO is distributed over the second ligand, and wherein the first ligand and the second ligand are cyclometalated ligands. ### Claim 14 (depends on 13) The light-emitting element according to claim 13, wherein a first heteroaromatic ring coordinated to the central metal and included in the first ligand is different from a second heteroaromatic ring coordinated to the central metal and included in the second ligand. ### Claim 15 (depends on 14) The light-emitting element according to claim 14, wherein the first heteroaromatic ring includes a first monocyclic ring containing a nitrogen atom coordinated to the central metal, wherein the second heteroaromatic ring includes a second monocyclic ring containing a nitrogen atom coordinated to the central metal, and wherein the first monocyclic ring is different from the second monocyclic ring. ### Claim 16 (depends on 15) The light-emitting element according to claim 15, wherein the number of members in each of the first monocyclic ring and the second monocyclic ring is 5 or 6. ### Claim 17 (depends on 15) The light-emitting element according to claim 15, wherein the number of the nitrogen atom in the first monocyclic ring is 1 and the number of the nitrogen atom in the second monocyclic ring is 2 or 3. ### Claim 18 (depends on 15) The light-emitting element according to claim 15, wherein the first monocyclic ring is a pyridine ring, and wherein the second monocyclic ring is a pyrimidine ring or a triazine ring. ### Claim 19 (depends on 15) The light-emitting element according to claim 15, wherein the first heteroaromatic ring is a pyridine ring, and wherein the second heteroaromatic ring is a pyrimidine ring or a triazine ring. ### Claim 20 (depends on 13) The light-emitting element according to claim 13, wherein the central metal is iridium. ### Claim 21 (depends on 13) A light-emitting device comprising a transistor or a substrate, and the light-emitting element according to claim 13. ### Claim 22 (depends on 21) An electronic device comprising a microphone, a camera, an operation button, an external connection portion or a speaker, and the light-emitting device according to claim 21. ### Claim 23 (depends on 21) An electronic device comprising a housing or a touch sensor, and the light-emitting device according to claim 21. ### Claim 24 (depends on 13) A lighting device comprising a transistor or a substrate, and the light-emitting element according to claim 13. ### Claim 25 An organometallic complex having a structure represented by General Formula (G1): where R1 to R15 separately represent hydrogen, a halogen group, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 12 carbon atoms. ### Claim 26 An organometallic complex having a structure represented by General Formula (G2): where n is 1 or 2, and R1 to R15 separately represent hydrogen, a halogen group, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 12 carbon atoms.