Method of preparing a luminescent quartz glass activated by biva

Details Method of preparing a luminescent quartz glass activated by biva Method of preparing a luminescent quartz glass activated by biva

1987-10-07

1989-03-21

Bell, Mark L.

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

501 54, 501 64, 428426, 428432, C03C 306, C03C 3095, C09K 1108

Patent

active

048141054

ABSTRACT:
Method of preparing an aluminum oxide containing quartz glass activated by bivalent europium and comprising as glass matrix oxides mainly SiO.sub.2 and furthermore per mol of SiO.sub.2 up to at most 0.15 mol of at least one of the oxides, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, P.sub.2 O.sub.5, ZrO.sub.2, Scf.sub.2 O.sub.3, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Lu.sub.2 O.sub.3, the alkali metal oxides and the alkaline earth metal oxides. A mixture is made of the composite oxides or of compounds which yield these oxides. The mixture comprises europium in the form of an aluminum containing compound of bivalent europium. The mixture is melted at a high temperature in a reducing atmosphere and is then cooled. The luminescent quartz glasses obtained are used in luminescent screens of, for example, low-pressure mercury vapor discharge lamps.

REFERENCES:
patent: 3527711 (1970-09-01), Barber et al.
patent: 4336048 (1982-06-01), van der Steen et al.
patent: 4361779 (1982-11-01), van der Steen et al.
J. Electrochem. Soc., vol. 107, No. 5 (1970), pp. 708-711.

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