The method of manufacturing a phosphor, a phosphor and a light emitting device

Phosphor of the present invention, which is a by the following formula (1) represents the phosphor cerium activated sialon crystal consisting essentially consisting of: [Formula 1] general formula: (Sr1-x, Cex) αSiβAlγOδNω (1) (wherein, x is 0 & lt; x & lt; 1, α is 0 & lt; α ≦ 3, β, γ, δ and ω is the [alpha] equal to the converted value of 2, satisfying 5 ≦ β ≦ 9,1 ≦ γ ≦ 5,0 ≦ δ ≦ 1.5,10 ≦ ω ≦ 20 number), the phosphor particles having a sphericity of 0.65 or more, by UV, violet or blue light and the yellow light emitting excitation light.