# US 11,999,632 B2 · Quantum dot, display panel and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,632 B2 - Document ID: US11999632B2 - Status: Granted - Kind: B2 - Application number: 17/534,328 - Filed: 2021-11-23 - Published: 2022-06-23 - Granted: 2024-06-04 - Earliest claimed: 2020-12-23 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: KyungKook Jang; DaBin Kim; SeungRyong Lee - Web page: https://patentgrep.com/patent/US11999632B2 ## CPC - C01G 9/08: Sulfides - C01G 9/006: {Compounds containing zinc, with or without oxygen or hydrogen, and containing two or more other elements} - C01G 15/00: Compounds of gallium, indium or thallium - C09K 11/565: {with zinc cadmium} - C09K 11/70: containing phosphorus - C09K 11/883: {with zinc or cadmium} - G02B 5/20: Filters (polarising elements G02B5/30) - H10H 20/8512: {Wavelength conversion materials} - H10K 59/38: comprising colour filters or colour changing media [CCM] - B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - B82Y 35/00: Methods or apparatus for measurement or analysis of nanostructures - B82Y 40/00: Manufacture or treatment of nanostructures - C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer - C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values - G02B 2207/101: Nanooptics - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02F 2202/36: Micro- or nanomaterials - H10H 20/0361: {of wavelength conversion means} - H10H 20/8515: {not being in contact with the bodies} - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A quantum dot includes a core, a first shell and a second shell. The core includes a group III-V compound. The first shell includes a second semiconductor nanocrystal. The second semiconductor nanocrystal includes zinc, selenium and a dopant including tellurium. The second shell includes a third semiconductor nanocrystal. The third semiconductor nanocrystal includes a II-VI compound. ## Claims ### Claim 1 A quantum dot, comprising: a core including a group III-V compound; a first shell including a second semiconductor nanocrystal, the second semiconductor nanocrystal including: zinc, selenium, and a dopant including tellurium; and a second shell including a third semiconductor nanocrystal, the third semiconductor nanocrystal including a II-VI compound, wherein: the dopant of tellurium is positioned at an interface between the first shell and the second shell; the molar ratio of tellurium to selenium in the first shell is in a range of 5:95 to 50:50; and the molar ratio of tellurium to zinc in the first shell is in a range of 6:94 to 35:65. ### Claim 2 (depends on 1) The quantum dot according to claim 1, wherein the core comprises a first semiconductor nanocrystal including indium and phosphorus. ### Claim 3 (depends on 1) The quantum dot according to claim 1, wherein the third semiconductor nanocrystal comprises zinc and sulfur. ### Claim 4 (depends on 1) The quantum dot according to claim 1, wherein a maximum emission wavelength λmax of the quantum dot is in a range of 540 nm to 550 nm when the quantum dot is irradiated by light having a wavelength of 440 nm to 460 nm. ### Claim 5 (depends on 1) The quantum dot according to claim 1, wherein a quantum yield of the quantum dot is 86% or more and a half width of the quantum dot is 40 nm or less. ### Claim 6 A display panel, comprising: a light source configured to emit light having a wavelength of substantially 450 nm, the light having a first color; and a wavelength conversion layer positioned on a path of the light emitted from the light source, the wavelength conversion layer including a quantum dot configured to convert the light having the first color into light having a second color, and the quantum dot including: a core comprising a group III-V compound; a first shell including a second semiconductor nanocrystal, the second semiconductor nanocrystal including: zinc, selenium, and a dopant including tellurium; and a second shell including a third semiconductor nanocrystal, the third semiconductor nanocrystal including a II-VI compound, wherein: the dopant of tellurium is positioned at an interface between the first shell and the second shell; the molar ratio of tellurium to selenium in the first shell is in a range of 5:95 to 50:50; and the molar ratio of tellurium to zinc in the first shell is in a range of 6:94 to 35:65. ### Claim 7 (depends on 6) The display panel according to claim 6, wherein the first color is blue and the second color is green. ### Claim 8 (depends on 6) The display panel according to claim 6, further comprising: a color filter positioned on a path of the light having the second color. ### Claim 9 A display device, comprising a display panel and a controller configured to control the display panel, wherein the display panel comprises: a light source configured to emit light having a wavelength of substantially 450 nm, the light having a first color; and a wavelength conversion layer positioned on a path of the light emitted from the light source, the wavelength conversion layer including a quantum dot configured to convert the light having the first color into light having a second color, and the quantum dot including: a core comprising a group III-V compound; a first shell including a second semiconductor nanocrystal, the second semiconductor nanocrystal including: zinc, selenium, and a dopant including tellurium; and a second shell including a third semiconductor nanocrystal, the third semiconductor nanocrystal including a II-VI compound, wherein: the dopant of tellurium is positioned at an interface between the first shell and the second shell; the molar ratio of tellurium to selenium in the first shell is in a range of 5:95 to 50:50; and the molar ratio of tellurium to zinc in the first shell is in a range of 6:94 to 35:65.