| abstract |
A phosphor formed from a europium-activated sialon crystal having a basic composition represented by general formula (1): Sr 1-x , Eu x ) α Si β Al γ O δ N ω . (In the formula, x is 0<x<1, α is 0<α≤4, and β, γ, δ and ω are numbers such that the converted numerical values when α is 3 satisfy 9<β≤15, 1≤γ≤5, 0.5≤δ≤3, and 10≤ω≤30.) This phosphor has a particle sphericity of 0.65 or more, and emits green light when excited with ultraviolet light, violet light, or blue light. |