Electric lamp having a fluorescence-suppressed quartz-glass enve

Details Electric lamp having a fluorescence-suppressed quartz-glass enve Electric lamp having a fluorescence-suppressed quartz-glass enve

1995-05-11

1996-12-31

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Envelope composition

313112, 313580, 501 54, 501905, 428 344, H01J 1716, H01J 6130

Patent

active

055897347

ABSTRACT:
To inhibit, or at least sharply attenuate, fluorescence of a quartz-glass velope (10) surrounding a light source (11), such as a halogen incandescent lamp, a high-pressure discharge lamp, or the like, when the quartz glass is subjected to ultraviolet (UV) radiation from the light source, and has been doped with a UV radiation absorbing material, typically a cerium, or cerium-titanium doping, the quartz-glass envelope is additionally doped with praseodymium or a praseodymium compound, such as praseodymium oxide or praseodymium aluminate. The pure praseodymium in the doping is, preferably, present in quantities of between about 0.008 and 1.25%, by weight, with reference to the undoped quartz glass. Barium metaborate can also be used, preferably together with praseodymium to attenuate the fluorescence. Preferably, the praseodymium is used as a combined doping with cerium, in form of a cerium-praseodymium aluminate, added to the starting material for the quartz glass, and before the quartz glass is fused from quartz sand or pulverized quartz crystal.

REFERENCES:
patent: 1634182 (1927-06-01), Gell et al.
patent: 3527711 (1970-09-01), Barber et al.
patent: 4211758 (1980-07-01), Buhrer
patent: 4361779 (1982-11-01), Van der Steen et al.
patent: 5039631 (1991-08-01), Krashkevich et al.
patent: 5077240 (1991-12-01), Hayden et al.
patent: 5196759 (1993-03-01), Parham et al.
patent: 5464462 (1995-11-01), Langer et al.

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