Yttrium substituted barium thioaluminate phosphor materials
AssigneeiFire Technology Inc.
InventorsM. Nakua Abdul, Dan Daeweon Cheong
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Abstract
A thin film phosphor for an electroluminescent device, the phosphor being selected from the group consisting of thiasluminates, 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 a Group IIIB element as a partial substitute for a portion of aluminum, gallium or indium of the thiogallate, thioindate and thioaluminate. The phosphor provides improved luminance. An electroluminescent device consisting of the thin film phosphor on a substrate is also described.
Claims43
A thin film phosphor for an electroluminescent device, said phosphor being a barium thioaluminate containing a rare earth metal activator and also containing yttrium as a partial substitute for a portion of aluminum of said thioaluminate, and wherein said phosphor contains said rare earth metal in an amount in the range of about 1–10 atomic percent of barium and yttrium is present in an amount in the range of about 0.1–20 atomic percent of aluminum.
A phosphor material having the formula:
- A1-wDw[YxZ1-x]yS4, wherein
- A is a Group IIA or Group IIB cation;
- D is a rare earth metal;
- Z is selected from Al, Ga and In;
- 0<x<0.2;
- y=2;
- and
- 0.005<w<0.1.
A phosphor material having the formula:
- A1-wDw[MxZ1-x]yS4, wherein
- A is a Group IIA or Group IIB cation;
- D is a rare earth metal;
- M is a Group IIIB metal selected from Y, Sc, La and Ac;
- Z is selected from Al, Ga and In;
- 0<x<0.2;
- y=2;
- and
- 0.005<w<0.1.
Dependencies are inferred from the claim text.