Phosphor particle, composite, light-emitting device, and method for producing phosphor particle

An α-sialon phosphor particle containing Eu,

• wherein at least one minute recess is formed on a surface of the α-sialon phosphor particle;
• wherein in one cross-section that crosses the minute recess, a depth is equal to or more than 5 nm and equal to or less than 500 nm, and
• wherein the α-sialon phosphor particle is formed of an α-sialon phosphor containing an Eu element, represented by General Formula:
• (M1x, M2y, Euz) (Si12−(m+nAlm+n)(OnN16−n) (provided that M1 is a monovalent Li element and M2 is a divalent Ca element), and in the general formula, x=0, 0<y<2.0, 0<z≤0.5, 0<x+y, 0.3≤x+y+z≤2.0, 0<m≤4.0, and 0<n≤3.0 are satisfied.