Denka Company Limited

Mitsuru Kawagoe

Takashi Kawasaki

Hiroaki Toyoshima

A phosphor in which at least some of an element M in a phosphor host crystal represented by M(L, A)Xis substituted with Eu as an activation material. M represents one or more (including at least Sr) of Mg, Ca, Sr, Ba, and Zn, L represents one or more of Li, Na, and K, A represents one or more of Al, Ga, B, In, Sc, Y, La, and Si, X represents one or more (except that X represents only N) of O, N, F, and Cl, α, β, γ, and δ satisfy 8.70≤α+β+γ+δ≤9.30, 0.00<α≤1.30, 3.70≤β≤4.30, 3.70≤γ≤4.30, and 0.00<δ≤1.30. In a fluorescence spectrum obtained by irradiation with light having a wavelength of 260 nm, when a fluorescence intensity at a wavelength of 569 nm is represented by Iand a fluorescence intensity at a wavelength of 617 nm is represented by I, I/Iis 0.01 or more and 0.4 or less.

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Tokyo, Japan

Mitsuru Kawagoe