| abstract |
The present invention provides a β-sialon phosphor with little decrease in emission intensity. A general formula: Si in 6-Z Al Z O Z N 8-Z β -sialon is a host material represented by, and a solid solution of Eu as the luminescent center, was measured laser diffraction, by scattering particles A phosphor having a diameter distribution of 10% diameter (D 10 ) in an integrated fraction of 7 to 20 μm and a powder having a 90% diameter (D 90 ) of 50 to 90 μm, and silicon nitride Holding a raw material powder obtained by mixing a powder, an aluminum nitride powder, and optionally an aluminum-containing compound and an Eu-containing compound, at a temperature of 1850 to 2050 ° C. for 9 hours or more in a nitrogen atmosphere or a non-oxidizing atmosphere. It is obtained by. [Selection figure] None |