Light emitting device and phosphor

A light-emitting device comprising:

• a semiconductor light-emitting element that emits ultraviolet light or visible light;
• and
• a phosphor that absorbs ultraviolet light or visible light emitted from the semiconductor light-emitting element and emits light in the infrared region,
• wherein an emission peak wavelength in the infrared region of the phosphor emitting in the infrared region is from 780 to 1,050 nm, and the half width of an emission peak waveform is more than 50 nm, and
• wherein the phosphor that emits light in the infrared region is represented by the following Formula (1)
• (M11-bM2b)(M31-dM4d)12O19 (1),
• where
• M1 represents one or more metal elements selected from alkaline earth metal elements other than Mg;
• M2 represents one or more metal elements selected from rare earth metal elements other than Se;
• M3 represents two or more metal elements comprising at least Ga and Al, and comprising one or more metal elements selected from Mg, Zn, B, In, Sc, Si, Ge, Ti, Sn, Zr, and Hf;
• M4 represents one or more metal elements selected from Cr, Mn, Fe, Ni, and Cu;
• O represents oxygen;
• and
• 0≤b≤1 and 0<d≤0.5.