US 12,264,274 B2
Beta-sialon phosphor and light emitting device
Tomohiro Nomiyama, Tokyo (JP); Manabu Kobayashi, Tokyo (JP); Masaru Miyazaki, Tokyo (JP); and Tatsuya Okuzono, Tokyo (JP)
Assigned to DENKA COMPANY LIMITED, Tokyo (JP)
Appl. No. 17/636,264
Filed by DENKA COMPANY LIMITED, Tokyo (JP)
PCT Filed Aug. 14, 2020, PCT No. PCT/JP2020/030893
§ 371(c)(1), (2) Date Feb. 17, 2022,
PCT Pub. No. WO2021/033646, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 2019-150289 (JP), filed on Aug. 20, 2019.
Prior Publication US 2022/0298415 A1, Sep. 22, 2022
Int. Cl. C09K 11/77 (2006.01); C01B 21/082 (2006.01); C09K 11/61 (2006.01); H01L 33/50 (2010.01); H01L 23/00 (2006.01)
CPC C09K 11/77348 (2021.01) [C01B 21/0826 (2013.01); C09K 11/617 (2013.01); H01L 33/502 (2013.01); H01L 33/504 (2013.01); C01P 2002/54 (2013.01); C01P 2002/74 (2013.01); C01P 2004/61 (2013.01); H01L 24/48 (2013.01); H01L 2224/48175 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A europium-doped β-sialon phosphor,
wherein an atomic percentage of an aluminum element to all elements at a depth of 8 nm from a surface of the phosphor, which is obtained by X-ray photoelectron spectroscopy, is indicated by P(Al)8, an atomic percentage of an aluminum element to all elements at a depth of 80 nm from the surface of the phosphor is indicated by P(Al)80, and wherein
P(Al)8/P(Al)80 is ≤0.8,
the P(Al)8 is from 0.3 or more to 0.8 or less, and
the β-sialon phosphor is represented by general formula Si6-ZAlZOZN8-Z:Eu2+ (0<Z≤4.2).