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AssigneeIfire IP Corporation
InventorsJames Alexander Robert Stiles, John Wesley Moore, Vincent Joseph Alfred Pugliese, Hiroki Hamada, Isao Yoshida
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A thin film phosphor for an electroluminescent device, the phosphor being selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor being activated by a rare earth metal and containing oxygen as a partial substitute for a portion of the sulphur in the crystal lattice of the thiogallate, thioindate or thioaluminate. The phosphor is a single phase homogeneous compound and provides improved luminance stability. An electroluminescent device comprising the thin film phosphor is also described and methods of making the phosphor of the invention.
A thin film phosphor for an electroluminescent device, said phosphor being a thioaluminate having at least one cation selected from elements of Group IIA and IIB of the Periodic Table of Elements, said phosphor being activated by a rare earth metal and containing oxygen as a partial substitute for the sulphur in said thioaluminate, wherein said phosphor is substantially a homogeneous single phase, wherein said rare earth metal is europium, and wherein said phosphor contains europium in an amount in the range of about 2-7 atomic percent of barium and oxygen is substituted in the crystal lattice structure of said compound providing a ratio of oxygen to sulphur in the range of about 0.4 to 1.6.
A phosphor material having the formula:
Dependencies are inferred from the claim text.