公开(公告)号：US20220298415A1

公开(公告)日：2022-09-22

申请号：US17636264

申请日：2020-08-14

Applicant: DENKA COMPANY LIMITED

Inventor： Tomohiro NOMIYAMA ,  Manabu KOBAYASHI ,  Masaru MIYAZAKI ,  Tatsuya OKUZONO

IPC: C09K11/77 ,  C01B21/082 ,  C09K11/61 ,  H01L33/50

Abstract: A europium-doped β-sialon phosphor, in which, when the ratio of an aluminum element at a depth of 8 nm from the surface of the phosphor, which is obtained by X-ray photoelectron spectroscopy, is indicated by P8 [at %], and the ratio of an aluminum element at a depth of 80 nm from the surface of the phosphor is indicated by P80 [at %], P8/P80≤0.9 is satisfied. A light emitting device containing this β-sialon phosphor.

公开(公告)号：US20220356396A1

公开(公告)日：2022-11-10

申请号：US17636169

申请日：2020-08-14

Applicant: DENKA COMPANY LIMITED

Inventor： Tomohiro NOMIYAMA ,  Manabu KOBAYASHI ,  Masaru MIYAZAKI ,  Tatsuya OKUZONO

IPC: C09K11/77 ,  H01L33/50 ,  C09K11/57 ,  H01L51/50

Abstract: A europium-doped β-sialon phosphor particle. When the element concentration of a Si atom on the surface portion of the particle that is obtained by analyzing a cross section of the phosphor particle by the energy dispersive X-ray analysis method is indicated by Ps [at %], and the element concentration of a Si atom near the center of the particle that is obtained by an analysis by the same method is indicated by Pc [at %], the Pc-Ps value is 3 at % or more.

公开(公告)号：US20220010205A1

公开(公告)日：2022-01-13

申请号：US17294721

申请日：2019-11-07

Applicant: DENKA COMPANY LIMITED

Inventor： Manabu KOBAYASHI ,  Keita KOBAYASHI ,  Tomohiro NOMIYAMA ,  Shintaro WATANABE

IPC: C09K11/77 ,  H01L33/50

Abstract: A β-sialon phosphor that is a solid solution of europium, in which D50 is 7.0 μm or more and 20.0 μm or less and (D50−D10)/D50 is 0.60 or less, where D50 is a 50% area diameter of primary particles of the β-sialon phosphor, and D10 is a 10% area diameter of the primary particles of the β-sialon phosphor. Primary particles are defined as single-crystal particles distinguished for each crystal orientation by identifying the crystal orientation of individual particles of the β-sialon phosphor by an electron backscatter diffraction image method. D50 and D10 are obtained by image analysis of the cross-sectional area of the primary particles.

公开(公告)号：US20220204842A1

公开(公告)日：2022-06-30

申请号：US17605079

申请日：2020-04-15

Applicant: DENKA COMPANY LIMITED

Inventor： Manabu KOBAYASHI ,  Tomohiro NOMIYAMA

IPC: C09K11/77 ,  H01L33/26 ,  H01L33/50 ,  C01F17/30 ,  C09K11/61

Abstract: A phosphor powder contains an EU-activated β-type sialon phosphor particles. When a median diameter in the phosphor powder having not been subjected to an ultrasonic homogenizer treatment is set as D1 and a median diameter in the phosphor powder having been subjected to an ultrasonic homogenizer treatment is set as D2, 1.05≤D1/D2≤1.70. A dispersion liquid in which 30 mg of the phosphor powder is uniformly dispersed in 100 ml of a 0.2% concentration of a sodium hexametaphosphate aqueous solution is added to a columnar container of which a bottom surface has an inner diameter of 5.5 cm. Then, the dispersion liquid is irradiated with ultrasonic waves for 3 minutes at a frequency of 19.5 kHz, and an output of 150 W, in a state where a cylindrical tip, which has an outer diameter of 20 mm, of an ultrasonic homogenizer is immersed in the dispersion liquid in ≥1.0 cm.

公开(公告)号：US20210032535A1

公开(公告)日：2021-02-04

申请号：US16981819

申请日：2019-03-19

Applicant: DENKA COMPANY LIMITED

Inventor： Yusuke TAKEDA ,  Tomohiro NOMIYAMA ,  Manabu KOBAYASHI ,  Shintaro WATANABE

IPC: C09K11/64 ,  C09K11/08 ,  H01L33/50 ,  G02F1/13357

Abstract: A β-sialon phosphor represented by general formula: Si6−zAlzOzN8−z (0