Claims
- 1. A light emitting phosphor material that primarily emits light in the blue region of the visible light spectrum for an alternating current thin-film electroluminescent device that includes said phosphor material sandwiched between a pair of dielectric layers suitable to substantially prevent DC current from flowing therebetween, where said phosphor material has the formula M.sup.II S:D,H,F wherein M.sup.II is taken from the group calcium, strontium, barium and magnesium, S is sulphur, D is taken from the group copper, lead, gold, silver, magnesium, antimony, bismuth and arsenic, H is taken from the group fluorine, chlorine, bromine and iodine, and F is taken from the group gallium, indium, aluminum, germanium, silicon, lanthanum, scandium and yttrium.
- 2. The light emitting phosphor of claim 1 wherein M.sup.II is strontium, D is copper, H is iodine and F is gallium.
- 3. The light emitting phosphor of claim 2 wherein the doping concentration of copper is between 0.05 and 5 mol %, the doping concentration of iodine is between 0.05 and 5 mol % and the doping concentration of gallium is between 0.5 and 10 mol %.
- 4. The light emitting phosphor of claim 1 wherein M.sup.II S is a mixture of strontium sulfide and calcium sulfide and D is copper.
- 5. The ACTFEL device of claim 4 wherein F is gallium.
- 6. The light emitting phosphor of claim 1 wherein said phosphor material emits blue light, and whose emission spectrum has a peak wavelength between 470 and 530 nm.
- 7. An alternating current thin-film electroluminescent device comprising front and rear sets of electrodes sandwiching a pair of insulators, said pair of insulators sandwiching thin film electroluminescent phosphor material therebetween suitable to substantially prevent DC current from flowing therebetween, said phosphor material primarily emitting light in the blue region of the visible light spectrum comprising a thin film layer having the formula M.sup.II S:D, H, F where M.sup.II is taken from the group calcium, strontium, barium, and magnesium, S is sulphur, D is taken from the group copper, lead, gold, silver, magnesium, antimony, bismuth, and arsenic, H is taken from the group fluorine, chlorine, bromine and iodine, and F is taken from the group gallium, indium, aluminum, germanium, silicon, lanthanum, scandium and yttrium.
- 8. The ACTFEL device of claim 7 wherein M.sup.II is strontium, D is copper, H is iodine and F is gallium.
- 9. The ACTFEL device of claim 8 wherein the dopant concentrations are: copper is between 0.05 and 5 mol %, iodine is between 0.05 and 5 mol % and gallium is between 0.5 and 10 mol %.
- 10. The ACTFEL device of claim 7 wherein M.sup.II is taken from the group strontium and calcium and H is iodine.
Parent Case Info
This is a continuation of U.S. patent application Ser. No. 08/759,293 filed Dec. 2, 1996 now U.S. Pat. No. 5,939,825.
US Referenced Citations (5)
Continuations (1)
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Number |
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759293 |
Dec 1996 |
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