Phosphor, light-emitting device, illumination device and image display device

1. A phosphor comprising a crystalline phase having a composition expressed by Formula [1] below, a crystal system of the phosphor being a hexagonal crystal system,

M m A a Al b Si c N 40   [1]

(in Formula [1]

M denoted an activating element,

A denotes one or more types of elements selected from the group consisting of alkaline earth metal elements, and

m, a, b and c denote values that satisfy expressions below independent from each other

0< m≤ 0.2

1.2≤ a≤ 5.6

2.4≤ b≤ 11.2

18.8≤ c≤ 27.6).

2. A phosphor comprising a crystalline phase including elements M, A, Al, Si and N, a space group of the phosphor being P-6

(where M denotes an activating element, and

A denotes one or more types of elements selected from the group consisting of alkaline earth metal elements).

3. The phosphor according to claim 1 , wherein A includes Ca and/or Sr.

4. The phosphor according to claim 1 , wherein M includes Eu.

5. The phosphor according to claim 1 , wherein the phosphor has an emission peak wavelength in a range of 560 nm or more and 620 nm or less when irradiated with an excitation light having a wavelength of 350 nm or more and 450 nm or less.

6. A light-emitting device, comprising a first illuminant, and a second illuminant that emits visible light when irradiated with light from the first illuminant,

wherein the second illuminant includes the phosphor according to claim 1 .

7. An illumination device comprising the light-emitting device according to claim 6 as a light source.

8. An image display device comprising the light-emitting device according to claim 6 as a light source.