| 摘要 |
PROBLEM TO BE SOLVED: To provide a red light-emitting phosphor having excellent water resistance and a narrow half width of an emission peak.SOLUTION: A fluoride phosphor activated with tetravalent Mn can absorb blue light and emit red light, and has a composition represented by the general formula K[MMnF], where M is at least one selected from among Ti, Zr, Hf, Si, Ge and Sn, and a satisfies 0<a<0.2. Particles 71 of the phosphor have a surface region 72 where the concentration of the tetravalent Mn is lower than that in an inner region 73. |
