FIELD: chemistry.
SUBSTANCE: invention is meant for the chemical industry and can be used to protect bond paper and valuable documents, strict accounting forms, conformity marks of articles, excise and certification marks. An infrared luminophor having formula Y2-x-yErxCeyO2S, where x=0.20-0.45; 1·10-4≤y≤5·10-3 is described.
EFFECT: obtaining an infrared luminophor based on yttrium oxysulphide activated by erbium ions and co-activated by cerium ions, which has minimal visible anti-stokes luminescence when excited with laser radiation in the 0,90-0,98 mcm range and high intensity of stokes infrared luminescence in the 1,5-1,5 mcm range.
1 cl, 1 tbl, 12 ex
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Authors
Dates
2010-05-27—Published
2008-03-07—Filed