| abstract |
The present invention provides a phosphor having improved luminance over a conventional β-type sialon phosphor. In the present invention, a phosphor having improved luminance of the phosphor is provided by containing Al, O (oxygen), and Eu in a specific concentration in the β-sialon phosphor after production. That is, a β-sialon phosphor containing Si, Al, O, N and Eu, wherein the Al concentration in the phosphor is 0.80 mass% or more and 2.25 mass% or less, and the O concentration is 0.36 mass% or more and 1.15 mass% or less, and Eu is The phosphor is 0.40 mass% or more and 0.80 mass% or less, and the ratio (Al / O) of Al concentration with respect to O concentration is 2.0 or more and 3.0 or less, The fluorescent substance is provided. |