Method of producing a luminescent alkaline earth metal fluorohal

Details Method of producing a luminescent alkaline earth metal fluorohal Method of producing a luminescent alkaline earth metal fluorohal

1978-04-03

1979-06-12

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

041579810

ABSTRACT:
Method of preparing a luminescent alkaline earth metal fluorohalide activated by Eu.sup.2+ defined by the formula Me.sub.1-p Eu.sub.p FX (Me=Ba, Sr; X=Cl, Br, I; 0.001.ltoreq.p.ltoreq.0.20). MeF.sub.2 is suspended in water after which 1 mole of MeX.sub.2 per mole of MeF.sub.2 is dissolved in the suspension. The suspension, which may already contain europium, is evaporated to dryness at 50.degree. C. to 250.degree. C. The obtained product is mixed with the additional required amount of europium in the form of a europium halide and then is subjected to at least one temperature treatment at 600.degree. C. to 1000.degree. C. in a weakly reducing atmosphere. The obtained reaction product is subjected, possibly after being ground, to a final heating at 600.degree. C. to 850.degree. C. in an inert or weakly reducing atmosphere.

REFERENCES:
patent: 3988252 (1976-10-01), Ferretti
patent: 4075495 (1978-02-01), Stevels et al.

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