Luminescent zeolite

Details Luminescent zeolite Luminescent zeolite

1997-02-07

1998-06-30

Bonner, Melissa

Compositions

Inorganic luminescent compositions

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

2523044R, 423713, 423DIG21, 313483, 313486, 313463, 313467, 313503, C09K 1106

Patent

active

057729174

ABSTRACT:
The invention relates to a luminescent zeolite of the Faujasite type containing Ce.sup.3+ ions. Such a zeolite can for instance be used in the luminescent screen of a low pressure mercury discharge lamp for use in photochemical processes. According to the invention the zeolite further contains cations S.sup.n+, wherein n.gtoreq.2 and the sum of the amount of Ce.sup.3+ ions and the amount of cations S.sup.n+ per unit cell of the zeolite is at least 16. The zeolite exhibits a high quantum efficiency for converting UV radiation of 254 nm into radiation having an emission maximum between 315 and 400 nm, even in case the Ce.sup.3+ ion content is relatively low.

REFERENCES:
patent: 5464467 (1995-11-01), Fitch et al.
patent: 5574332 (1996-11-01), Kynast et al.

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