Yttrium substituted barium thioaluminate phosphor materials
AssigneeiFire Technology Inc.
InventorsDan Daeweon Cheong, Abdul M. Nakua
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Abstract
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 a Group IIIB element as a partial substitute for a portion of aluminum, gallium or indium of said thiogallate, thioindate and thioaluminate. The phosphor provides improved luminance. An electroluminescent device comprising the thin film phosphor on a substrate is also described.
Claims41
A thin film phosphor for an electroluminescent device, said 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, said 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 said thiogallate, thioindate and thioaluminate.
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.