# US 12,114,518 B2 · Electroluminescent device, manufacturing method thereof, and display device comprising the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,114,518 B2 - Document ID: US12114518B2 - Status: Granted - Kind: B2 - Application number: 17/511,706 - Filed: 2021-10-27 - Published: 2022-02-17 - Granted: 2024-10-08 - Earliest claimed: 2018-03-14 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sung Woo Kim; Chan Su Kim; Tae Ho Kim; Kun Su Park; Eun Joo Jang; Jin A Kim; Tae Hyung Kim; Jeong Hee Lee - Web page: https://patentgrep.com/patent/US12114518B2 ## CPC - H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 50/15: Hole transporting layers - H10K 50/16: Electron transporting layers - H10K 85/649: {Aromatic compounds comprising a hetero atom} - H10K 30/10: comprising heterojunctions between organic semiconductors and inorganic semiconductors - H10K 71/12: using liquid deposition, e.g. spin coating - Y02E 10/549: Organic PV cells - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract An electroluminescent device, a method of manufacturing the same, and a display device including the same. The electroluminescent device includes a first electrode and a second electrode facing each other; an emission layer disposed between the first electrode and the second electrode, the emission layer including light emitting particles; an electron transport layer disposed between the first electrode and the emission layer; and a hole transport layer disposed between the second electrode and the emission layer, wherein the electron transport layer includes inorganic oxide particles and a metal-organic compound, the metal-organic compound or a thermal decomposition product of the metal-organic compound being soluble a non-polar solvent. ## Claims ### Claim 1 An electroluminescent device, comprising a first electrode and a second electrode facing each other; an emission layer disposed between the first electrode and the second electrode, the emission layer comprising light emitting particles; an electron transport layer disposed between the first electrode and the emission layer; and a hole transport layer disposed between the second electrode and the emission layer, wherein the electron transport layer comprises inorganic oxide particles and a metal-organic compound or a thermal decomposition product of the metal-organic compound, and wherein the metal-organic compound comprises an oleate compound. ### Claim 2 (depends on 1) The electroluminescent device of claim 1, wherein the metal-organic compound comprises Zn, Ti, Sn, W, Ta, Mg, Ga, Na, Cu, Ag, or a combination thereof. ### Claim 3 (depends on 1) The electroluminescent device of claim 1, wherein the inorganic oxide particles comprise zinc, titanium, zirconium, tin, tungsten, tantalum, magnesium, gallium, sodium, copper, silver, or a combination thereof. ### Claim 4 (depends on 1) The electroluminescent device of claim 1, wherein the inorganic oxide particles are dispersible in a polar solvent. ### Claim 5 (depends on 1) The electroluminescent device of claim 1, wherein a surface of the electron transport layer facing the emission layer comprises a first portion in which the inorganic oxide particles are disposed and a second portion in which the metal-organic compound or the thermal decomposition product of the metal-organic compound is between neighboring inorganic oxide particles. ### Claim 6 (depends on 1) The electroluminescent device of claim 1, wherein the electron transport layer comprises a first layer comprising the inorganic oxide particles and a second layer comprising the metal-organic compound or the thermal decomposition product of the metal-organic compound. ### Claim 7 (depends on 6) The electroluminescent device of claim 6, wherein the second layer is disposed between the first layer and the emission layer. ### Claim 8 (depends on 6) The electroluminescent device of claim 6, wherein the first layer comprises a cluster layer comprising the inorganic oxide particles, and wherein a surface of the first layer facing the second layer comprises the metal-organic compound or the thermal decomposition product of the metal-organic compound. ### Claim 9 (depends on 6) The electroluminescent device of claim 6, wherein the first layer comprises an organic matrix filled in between neighboring inorganic oxide particles and the organic matrix comprises an organic material that is different from the metal-organic compound or the thermal decomposition product of the metal-organic compound. ### Claim 10 (depends on 6) The electroluminescent device of claim 6, wherein an average thickness of the second layer is less than an average thickness of the first layer. ### Claim 11 (depends on 1) The electroluminescent device of claim 1, wherein the inorganic oxide particles comprise metal oxide particles, and a metal in the metal oxide particles and a metal in the metal-organic compound are the same. ### Claim 12 (depends on 1) The electroluminescent device of claim 1, wherein an average thickness of the electron transport layer is about 20 nanometers to about 60 nanometers. ### Claim 13 (depends on 1) The electroluminescent device of claim 1, wherein the light emitting particles comprise quantum dots. ### Claim 14 (depends on 1) The electroluminescent device of claim 1, wherein the light emitting particles have a core-shell structure. ### Claim 15 (depends on 1) The electroluminescent device of claim 1, wherein the light emitting particles comprise a Group II-VI compound that does not comprise Cd, a Group III-V compound, a Group IV-VI compound, a Group IV element or compound, a Group I-III-VI compound, a Group I-II-IV-VI compound that does not comprise Cd, or a combination thereof. ### Claim 16 (depends on 1) The electroluminescent device of claim 1, wherein a hydrophobic organic ligand is attached to a surface of the light emitting particles. ### Claim 17 (depends on 1) A display device comprising the electroluminescent device of claim 1. ### Claim 18 A method of forming an electroluminescent device, the method comprising disposing a first electrode and a second electrode facing each other; disposing an emission layer between the first electrode and the second electrode, the emission layer comprising light emitting particles; disposing an electron transport layer between the first electrode and the emission layer, the electron transport layer comprising inorganic oxide particles, and a metal-organic compound or a thermal decomposition product of the metal-organic compound; and disposing a hole transport layer between the second electrode and the emission layer, wherein the metal-organic compound comprises an oleate compound. ### Claim 19 An electroluminescent device, comprising a first electrode and a second electrode facing each other; an emission layer disposed between the first electrode and the second electrode, the emission layer comprising light emitting particles; an electron transport layer disposed between the first electrode and the emission layer; and a hole transport layer disposed between the second electrode and the emission layer, wherein the electron transport layer comprises inorganic oxide particles and a thermal decomposition product of a metal-organic compound, and wherein the metal-organic compound comprises an oleate compound, an amine compound, or a combination thereof.