# US 11,898,079 B2 · Phosphor powder, composite, and 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 11,898,079 B2 - Document ID: US11898079B2 - Status: Granted - Kind: B2 - Application number: 17/598,520 - Filed: 2020-03-24 - Published: 2022-05-12 - Granted: 2024-02-13 - Earliest claimed: 2019-03-29 - Assignees: Denka Company Limited - Applicants: Denka Company Limited - Inventors: Tomohiro Nomiyama; Yusuke Takeda; Tatsuya Okuzono; Masaru Miyazaki; Shintaro Watanabe - Web page: https://patentgrep.com/patent/US11898079B2 ## CPC - C09K 11/7734: {Aluminates} - C09K 11/77348: {Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides} - C01F 17/34: Aluminates, e.g. YAlO3 or Y3-xGdxAl5O12 - C09K 11/0883: {Arsenides; Nitrides; Phosphides} - H10H 20/8512: {Wavelength conversion materials} - C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values - H10W 74/00: Encapsulations, e.g. protective coatings - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; 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 cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00}) - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A phosphor powder composed of α-sialon phosphor particles containing Eu. The phosphor powder has an ammonium ion concentration CA of the phosphor powder of equal to or more than 15 ppm and equal to or less than 100 ppm, which is determined from the following extracted ion analysis. (Extracted Ion Analysis A) 0.5 g of a phosphor powder is added to 25 ml of distilled water in a polytetrafluoroethylene (PTFE)-made container with a lid and held at 60° C. for 24 hours, and then a total mass MA of ammonium ions included in an aqueous solution obtained by removing a solid content from the solution by filtration is determined using ion chromatography. Then, CA is determined by dividing MA by the mass of the phosphor powder. ## Claims ### Claim 1 A phosphor powder composed of α-sialon phosphor particles containing Eu, wherein an ammonium ion concentration CA of the phosphor powder, determined from the following extracted ion analysis A, is equal to or more than 15 ppm and equal to or less than 100 ppm, (Extracted Ion Analysis A) 0.5 g of a phosphor powder is added to 25 ml of distilled water in a polytetrafluoroethylene (PTFE)-made container with a lid and held at 60° C. for 24 hours, a total mass MA of ammonium ions included in an aqueous solution obtained by removing a solid content from the solution by filtration is then determined using ion chromatography, and then, CA is determined by dividing MA by a mass of the phosphor powder. ### Claim 2 (depends on 1) The phosphor powder according to claim 1, wherein an ammonium ion concentration CB of the phosphor powder, determined from the following extracted ion analysis B, is equal to or more than 50 ppm and equal to or less than 250 ppm, (Extracted Ion Analysis B) 0.5 g of a phosphor powder is added to 25 ml of distilled water in a polytetrafluoroethylene (PTFE)-made container with a lid and held at 80° C. for 24 hours, a total mass MB of ammonium ions included in an aqueous solution obtained by removing a solid content from the solution by filtration is then determined using ion chromatography, and then, CB is determined by dividing MB by a mass of the phosphor powder. ### Claim 3 (depends on 1) The phosphor powder according to claim 1, wherein an ammonium ion concentration CC of the phosphor powder, determined from the following extracted ion analysis C, is equal to or more than 250 ppm and equal to or less than 650 ppm, (Extracted Ion Analysis C) 0.5 g of a phosphor powder is added to 25 ml of distilled water in a polytetrafluoroethylene (PTFE)-made container with a lid and held at 100° C. for 24 hours, a total mass MC of ammonium ions included in an aqueous solution obtained by removing a solid content from the solution by filtration is then determined using ion chromatography, and then, CC is determined by dividing MC by a mass of the phosphor powder. ### Claim 4 (depends on 1) The phosphor powder according to-claim 1, wherein the α-sialon phosphor particles are composed of an α-sialon phosphor containing an Eu element, represented by General Formula: (M1x, M2y, Euz)(Si12-(m+n)Alm+n)(OnN16-n) (provided that M1 is a monovalent Li element and M2 is a divalent Ca element), and in the general formula, 0≤x<2.0, 0≤y<2.0, 0≤z≤0.5, 0