Green emitting phosphor
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsRiichi Ogawara, Asuka Sasakura, Jun-ichi Itoh, Taizou Morinaka
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Abstract
A green emitting phosphor is provided, allowing the internal quantum efficiency to be increased. The green emitting phosphor comprises a mother crystal containing Sr, Ga and S, and a luminescent center, characterized in that, in an XRD pattern, the ratio of the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=14 to 20° over the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=21 to 27° is 0.4 or greater.
Claims6
A green emitting phosphor, comprising an alkaline earth thiogallate mother crystal comprising Sr and a luminescent center comprising Eu2+, wherein in an XRD pattern using a CuKα beam, the ratio of the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=14 to 20° over the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=21 to 27° is 0.4 or greater and wherein the ratio of the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=32 to 37° over the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=36 to 42° is 0.7 or greater.
Dependencies are inferred from the claim text.