Process of preparing infrared-excitable sodium rare earth fluori

Details Process of preparing infrared-excitable sodium rare earth fluori Process of preparing infrared-excitable sodium rare earth fluori

1972-05-22

1977-08-16

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

C09K 1146

Patent

active

040425274

ABSTRACT:
A hexagonal NaLnF.sub.4 :Yb.sup.3.sup.+, Er.sup.3.sup.+ (Ln represents the elements Y, La, Gd and/or Lu) has been found to be an efficient phospor emitting green light with infrared excitation, which can be prepared by firing a mixture of Na.sub.2 SiF.sub.6 and coprecipitated Ln.sub.1.sub.-y.sub.-z Yb.sub.y Er.sub.z F.sub.3. Optimum firing conditions for synthesis of NaLnF.sub.4 :Yb.sup.3.sup.+, Er.sup.3.sup.+ have been found to be such that:

REFERENCES:
patent: 3667921 (1972-06-01), Grodkiewicz et al.

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