Patent ID: 6376982
Filing Date: 2002-04-23
Classification: C09K,H01J

Abstract:
Electric discharge lamp, comprising an envelope at least part of which consists of a transparent wall whose inner surface is at least partly covered with a coating of luminescent material capable of emitting visible light due to the effect of being irradiated by ultraviolet excitation radiation, the lamp furthermore comprising means for producing such radiation, characterized in that the said luminescent material consists of least partly of a luminescent compound of formula:Ba7-x-yMxEuyF12XuYv in whichM represents at least one divalent metal chosen from calcium, magnesium, strontium and zinc; x is a number between 0 and 2; y is a number between 0.00001 and 2; X and Y each represent an element, which is identical or different, chosen from chlorine and bromine; and u and v are numbers between 0 and 2, the sum of which is equal to 2.