# US 2026/0096281 A2 · 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 2026/0096281 A2 - Document ID: US20260096281A2 - Status: Published application - Kind: A2 - Application number: 18/226,360 - Filed: 2023-07-26 - Published: 2026-04-02 - Earliest claimed: 2022-08-09 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Toshiki SASAKI; Nobuharu OHSAWA - Web page: https://patentgrep.com/patent/US20260096281A2 ## CPC - H10K 50/13: comprising stacked EL layers within one EL unit - H10K 50/19: Tandem OLEDs - H10K 50/16: Electron transporting layers - H10K 85/342: {comprising iridium} - H10K 85/371: {Metal complexes comprising a group IB metal element, e.g. comprising copper, gold or silver} - H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene} - H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom} - H10K 85/636: {comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom} - H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)} - H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons} - H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole} - H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene} - 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 ## Abstract A light-emitting device with a high resolution and high efficiency is provided. The light-emitting device includes a first EL layer, an intermediate layer, and a second EL layer between first and second electrodes. The first EL layer is provided between the first electrode and the intermediate layer, and the second EL layer is provided between the second electrode and the intermediate layer. Side surfaces of the first EL layer, the intermediate layer, and the second EL layer are substantially aligned. The first EL layer includes a layer having an electron-transport property. The intermediate layer is provided in contact with the layer having an electron-transport property. The intermediate layer includes a first organic compound and an alkali metal or a compound of an alkali metal. The layer having an electron-transport property includes a second organic compound. The second organic compound has a higher glass transition temperature than the first organic compound. ## Claims ### Claim 1 A light-emitting device comprising: a first EL layer, an intermediate layer, and a second EL layer between a first electrode and a second electrode, wherein the first EL layer is between the first electrode and the intermediate layer, wherein the second EL layer is between the second electrode and the intermediate layer, wherein a side surface of the first EL layer, a side surface of the intermediate layer, and a side surface of the second EL layer are aligned or substantially aligned, wherein the first EL layer comprises a layer having an electron-transport property, wherein the intermediate layer is in contact with the layer having an electron-transport property, wherein the intermediate layer comprises a first organic compound and one of an alkali metal and a compound of an alkali metal, wherein the layer having an electron-transport property comprises a second organic compound, and wherein a glass transition temperature of the second organic compound is higher than that of the first organic compound. ### Claim 2 A light-emitting device comprising: a first EL layer, an intermediate layer, and a second EL layer between a first electrode and a second electrode, wherein the first EL layer is between the first electrode and the intermediate layer, wherein the second EL layer is between the second electrode and the intermediate layer, wherein a side surface of the first EL layer, a side surface of the intermediate layer, and a side surface of the second EL layer are aligned or substantially aligned, wherein the second EL layer comprises a first layer and a layer having an electron-transport property, wherein the first layer is between the layer having an electron-transport property and the second electrode, wherein the first layer is in contact with the layer having an electron-transport property, wherein the first layer comprises a first organic compound and one of an alkali metal and a compound of an alkali metal, wherein the layer having an electron-transport property comprises a second organic compound, and wherein a glass transition temperature of the second organic compound is higher than that of the first organic compound. ### Claim 3 A light-emitting device comprising: a first EL layer, an intermediate layer, and a second EL layer between a first electrode and a second electrode, wherein the first EL layer is between the first electrode and the intermediate layer, wherein the second EL layer is between the second electrode and the intermediate layer, wherein a side surface of the first EL layer, a side surface of the intermediate layer, and a side surface of the second EL layer are aligned or substantially aligned, wherein the first EL layer comprises a first layer having an electron-transport property, wherein the intermediate layer is in contact with the first layer having an electron-transport property, wherein the intermediate layer comprises a first organic compound and one of an alkali metal and a compound of an alkali metal, wherein the first layer having an electron-transport property comprises a second organic compound, wherein a glass transition temperature of the second organic compound is higher than that of the first organic compound, wherein the second EL layer comprises a second layer and a third layer having an electron-transport property, wherein the second layer is between the third layer having an electron-transport property and the second electrode, wherein the second layer is in contact with the third layer having an electron-transport property, wherein the second layer comprises a third organic compound and one of an alkali metal and a compound of an alkali metal, wherein the third layer having an electron-transport property comprises a fourth organic compound, and wherein a glass transition temperature of the fourth organic compound is higher than that of the third organic compound. ### Claim 4 (depends on 3) The light-emitting device according to claim 3, wherein the glass transition temperature of the fourth organic compound is higher than that of the third organic compound by 15° C. or more. ### Claim 5 (depends on 1) The light-emitting device according to claim 1, wherein the glass transition temperature of the second organic compound is higher than that of the first organic compound by 15° C. or more. ### Claim 6 (depends on 3) The light-emitting device according to claim 3, wherein a refractive index of the fourth organic compound is higher than that of the third organic compound. ### Claim 7 (depends on 1) The light-emitting device according to claim 1, wherein a refractive index of the second organic compound is higher than that of the first organic compound. ### Claim 8 (depends on 3) The light-emitting device according to claim 3, wherein the third organic compound comprises a first heteroaromatic ring, wherein the fourth organic compound comprises a first polycyclic heteroaromatic ring, and wherein the number of rings in the first polycyclic heteroaromatic ring is larger than or equal to that of rings in the first heteroaromatic ring. ### Claim 9 (depends on 3) The light-emitting device according to claim 3, wherein the first organic compound comprises a second heteroaromatic ring, wherein the second organic compound comprises a second polycyclic heteroaromatic ring, and wherein the number of rings in the second polycyclic heteroaromatic ring is larger than or equal to that of rings in the second heteroaromatic ring. ### Claim 10 (depends on 8) The light-emitting device according to claim 8, wherein the first heteroaromatic ring comprises a phenanthroline skeleton. ### Claim 11 (depends on 9) The light-emitting device according to claim 9, wherein the second heteroaromatic ring comprises a phenanthroline skeleton. ### Claim 12 (depends on 8) The light-emitting device according to claim 8, wherein the first polycyclic heteroaromatic ring comprises two or more nitrogen atoms. ### Claim 13 (depends on 9) The light-emitting device according to claim 9, wherein the second polycyclic heteroaromatic ring comprises two or more nitrogen atoms. ### Claim 14 (depends on 3) The light-emitting device according to claim 3, wherein a LUMO level of the fourth organic compound is lower than that of the third organic compound by 0.2 eV or more. ### Claim 15 (depends on 1) The light-emitting device according to claim 1, wherein a LUMO level of the second organic compound is lower than that of the first organic compound by 0.2 eV or more. ### Claim 16 (depends on 2) The light-emitting device according to claim 2, wherein the glass transition temperature of the second organic compound is higher than that of the first organic compound by 15° C. or more. ### Claim 17 (depends on 3) The light-emitting device according to claim 3, wherein the glass transition temperature of the second organic compound is higher than that of the first organic compound by 15° C. or more. ### Claim 18 (depends on 2) The light-emitting device according to claim 2, wherein a refractive index of the second organic compound is higher than that of the first organic compound. ### Claim 19 (depends on 1) The light-emitting device according to claim 1, wherein the first organic compound comprises a first heteroaromatic ring, wherein the second organic compound comprises a first polycyclic heteroaromatic ring, and wherein the number of rings in the first polycyclic heteroaromatic ring is larger than or equal to that of rings in the first heteroaromatic ring. ### Claim 20 (depends on 2) The light-emitting device according to claim 2, wherein the first organic compound comprises a first heteroaromatic ring, wherein the second organic compound comprises a first polycyclic heteroaromatic ring, and wherein the number of rings in the first polycyclic heteroaromatic ring is larger than or equal to that of rings in the first heteroaromatic ring. ### Claim 21 (depends on 19) The light-emitting device according to claim 19, wherein the first heteroaromatic ring comprises a phenanthroline skeleton. ### Claim 22 (depends on 20) The light-emitting device according to claim 20, wherein the first heteroaromatic ring comprises a phenanthroline skeleton. ### Claim 23 (depends on 2) The light-emitting device according to claim 2, wherein a LUMO level of the second organic compound is lower than that of the first organic compound by 0.2 eV or more.