Method of producing a luminescent alkaline earth metal...

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

C - Chemistry, Metallurgy

09

K

31/128

C09K 11/04 (2006.01) C09K 11/77 (2006.01)

Patent

CA 1059747

ABSTRACT: Method of preparing a luminescent alkaline earth metal fluoroilalide activated by Eu2+ defined by the formula Me1-pEupFX (Me = Ba, Sr; X = Cl, Br, I; 0.001 ? p ? 0.20). MeF2 is suspended in water after which 1 mole of MeX2 per mole of MeF2 is dissolved in the suspension. The suspension, which may already contain europium, is evaporated to dryness at 50°C to 250°C. The obtained product is mixed with the additional re- quired amount of europium in the form of a europium halide and then is subjected to at least one temperature treatment at 600°C to 1000°C in a weakly reducing atmos- phere. The obtained reaction product is subjected, pos- sibly after being ground, to a final heating at 600°C to 850°C in an inert or weakly reducing atmosphere. - 15 -

236769

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