| abstract |
Provided is a phosphor made of Eu-activated β-sialon capable of realizing high luminance of a light emitting device such as a white LED using blue to ultraviolet light as a light source. A phosphor represented by a general formula: Si 6-z Al z O z N 8-z and mainly composed of β-sialon containing Eu, g = 25 ° C. in measurement by electron spin resonance spectrum A phosphor having a spin density corresponding to 2.00 ± 0.02 absorption of 2.0 × 10 17 / g or less. In the phosphor described above, the β-sialon has a lattice constant a of 0.7608 to 0.7620 nm, a lattice constant c of 0.2908 to 0.2920 nm, and an Eu content of 0.1 to 3 mass. % Is preferred. |