Aluminate fluorescent material, light emitting device, and method for producing aluminate fluorescent material

1. An aluminate fluorescent material, comprising an aluminate composition comprising:

at least one alkaline earth metal element selected from the group consisting of Ba, Sr, and Ca;

Mn; and

optionally Eu and/or Mg,

wherein a fluorine content in the aluminate fluorescent material is in a range of 100 ppm or more and 7,000 ppm or less, and

wherein an average particle diameter of the aluminate fluorescent material, which is measured according to a Fisher Sub-Sieve Sizer method, is 8 μm or more.

2. The aluminate fluorescent material according to claim 1 , wherein the aluminate composition is represented by the following formula (I):

X 1 p Eu t Mg q Mn r Al s O p+t+q+r+1.5s   (I)

wherein X 1 represents at least one element selected from the group consisting of Ba, Sr, and Ca; and p, q, r, s, and t each satisfy 0.5≤p≤1.0, 0≤q≤0.7, 0.3≤r≤0.7, 8.5≤s≤13.0, 0≤t≤0.5, 0.5≤p+t≤1.2, and 0.3<q+r≤1.0.

3. The aluminate fluorescent material according to claim 2 , wherein in the formula (I), X 1 comprises Ba, and p satisfies 0.6≤p≤1.0.

4. The aluminate fluorescent material according to claim 2 , wherein in the formula (I), r satisfies 0.4≤r≤0.6.

5. The aluminate fluorescent material according to claim 2 , wherein in the formula (I), t satisfies 0<t≤0.5.

6. The aluminate fluorescent material according to claim 1 , wherein a 50% volume particle diameter D50, which is measured according to a laser diffraction particle size distribution measuring method, is in a range of 15 μm or more and 50 μm or less.

7. A light emitting device, comprising: a fluorescent member comprising the aluminate fluorescent material according to claim 1 ; and an excitation light source having a light emission peak wavelength in a range of 380 nm or more and 485 nm or less.