B-sialon phosphor and light emitting device

Abstract

A β-sialon phosphor that is a solid solution of europium, in which D50 is 7.0 μm or more and 20.0 μm or less and (D50−D10)/D50 is 0.60 or less, where D50 is a 50% area diameter of primary particles of the β-sialon phosphor, and D10 is a 10% area diameter of the primary particles of the β-sialon phosphor. Primary particles are defined as single-crystal particles distinguished for each crystal orientation by identifying the crystal orientation of individual particles of the β-sialon phosphor by an electron backscatter diffraction image method. D50 and D10 are obtained by image analysis of the cross-sectional area of the primary particles.

Dependencies are inferred from the claim text.