| abstract |
The phosphor is obtained from europium-activated sialon crystals having a basic composition represented by the following formula (1), ≪ Formula 1 > (Sr 1- x , Eu x ) α Si β Al γ O δ N ω (Wherein x is 0 <x <1, α is 0 <α ≦ 4, and β, γ, δ and ω are converted to values when α is 3, 9 ≦ β ≦ 15, 1 ≦ γ ≦ 5 , 0.5 ≤ δ ≤ 3 and 10 ≤ ω ≤ 25) The sialon crystals may contain 0.1 mass% to at least one non-Eu rare earth element selected from Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. It includes in proportion of 10 mass%. The phosphor emits green light when excited by ultraviolet light, violet light or blue light. |