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US 5,961,882 AGranted
Use of a compound based on a rare-earth phosphate as a luminophor in plasma systems
AssigneeRhone-Poulenc Chimie
InventorDenis Huguenin
Life of this patent
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Abstract
The invention relates to the use as a luminophor in plasma systems of a compound based on an yttrium, lanthanum, gadolinium or lutecium phosphate doped with at least one rare earth chosen from the group comprising terbium, praseodymium, europium and cerium.
Claims8
In a plasma system, said plasma emitting radiation at a wavelength between 10 and 200 nm, the improvement which comprises, as the luminophor thereof, a luminophor comprising:
- (i) a compound based on a phosphate of a rare-earth of the formula LnP.sub.3 O.sub.9 and LnP.sub.5 O.sub.14, Ln being selected from the group consisting of yttrium, lanthanum, gadolinium or lutecium, and
- (ii) a dopant of compound (i) being a rare-earth which is a combination of terbium, and cerium.
In a plasma system, said plasma emitting radiation at a wavelength between 10 and 200 nm, the improvement which comprises, as the luminophor thereof, a luminophor comprising:
- (i) a compound based on a phosphate of a rare-earth of the formula LnPO.sub.4, Ln being selected from the group consisting of yttrium, lanthanum, gadolinium or lutecium, and
- (ii) a dopant of compound (i) being a rare-earth which is a combination of terbium and cerium.
Dependencies are inferred from the claim text.