Halophosphate phosphor, manufacturing method thereof, and light-emitting device

1 . A halophosphate phosphor comprising:

a halophosphate comprising

an alkaline earth metal comprising at least calcium;

europium; and

a halogen comprising at least chlorine, wherein

an elution amount of chlorine ions after the halophosphate phosphor is brought into contact with 10 times by mass of pure water at 85° C. for five hours is 7 ppm or less.

2 . The halophosphate phosphor according to claim 1 , further comprising:

a phosphate comprising europium, wherein

given 100 as a maximum diffraction intensity of the halophosphate phosphor in an X-ray diffraction spectrum, an integrated value of diffraction intensity in a 2θ range of 29° or more and 30° or less is in a range of 68 or more and 78 or less.

3 . The halophosphate phosphor according to claim 1 , wherein the halophosphate has a composition such that, given 6 as a number of moles of phosphorus, a number of moles of calcium is in a range of 5.7 or more and 10.1 or less, a number of moles of strontium is in a range of 0 or more and 2.1 or less, a number of moles of europium is in a range of 0.09 or more and 2.1 or less, and a number of moles of halogen is in a range of 1.9 or more and 2.1 or less.

4 . The halophosphate phosphor according to claim 1 , wherein the halophosphate has a composition represented by Formula (1):

where

x, y, z, and w satisfy 0≤x≤0.21, 0.009<y≤0.21, 9≤z≤11, and 1.9≤w≤2.1, and

Cl is optionally partially substituted with at least one selected from the group consisting of F and Br.

5 . A light-emitting device comprising:

a wavelength conversion member comprising the halophosphate phosphor according to claim 1 ; and

a light-emitting element having a light emission peak wavelength in a range of 400 nm or more and 460 nm or less.