Luminescent screen and low-pressure mercury vapour discharge...

Details Luminescent screen and low-pressure mercury vapour discharge... Luminescent screen and low-pressure mercury vapour discharge...

H - Electricity

01

J

313/81

H01J 61/44 (2006.01) C09K 11/77 (2006.01)

Patent

CA 1169466

PHN. 9879 14 ABSTRACT: Luminescent screen comprising a lumincescent material activated by lead or by lead and terbium and/or manganese, the luminescent material having the hexagonal apatite crystal structure and a composition which is defined by the general formula MeaLnb(AO4)6X2, wherein Me represents at least one of the elements Ca, Sr, Ba, Mg and Zn, wherein Ln represents at least one of the elements Y and La, and (AO4) at least one anion from the group (PO4)3-, (SiO4)4- and (BO4)5-, and wherein X represents at least one element of the group of oxygen, the halogens and vacanoies, and wherein a ? o, b ? o and 9 < a+b < 10. The material further comprises Gd, which at least paartly replaces the Ln. The luminescent screen is particularly suitable for use in low-pressure mercury vapour discharge lamps.

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