Patent ID: 11898079
Assignee: DENKA COMPANY LIMITED
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 1:
2. 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.