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Title:
OPTICAL STORAGE PHOSPHOR, METHOD FOR CHECKING AN AUTHENTICITY FEATURE, DEVICE FOR CARRYING OUT A METHOD, AUTHENTICITY FEATURE AND VALUE DOCUMENT
Document Type and Number:
WIPO Patent Application WO/2019/057329
Kind Code:
A8
Abstract:
The invention relates to an optical storage phosphor, to a method for checking an authenticity feature, to a device for carrying out a method, to an authenticity feature and to a value document. In particular, an inorganic optical storage phosphor is specified, having a garnet structure and the following composition: (GdxLny) (GamAlnAk) O12±d : Cep Qq Rr Tt, wherein: Ln comprises at least one of the following elements: La, Lu, Y; A comprises at least one of the following elements: Ge, Sc, Si; Q comprises at least one of the following elements: Ag, Cr, Hf, Mo, Nb, Sn, Ta, Ti, W, Zr; R comprises at least one of the following elements: Bi, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb; T comprises at least one of the following elements: B, F, Li, Mg, K, Na; 1.0 ≤ x ≤ 3.2 and 0 ≤ y ≤1.65; 0.5 ≤ m ≤ 5.2, 0≤ n ≤ 4.7 and 0 ≤ k ≤ 0.5, and 4.8 ≤ m+n+k ≤ 5.2; 0 ≤ p ≤ 0.1, and p = 0 only for Q=Zr; 0 ≤ q ≤ 0.05; 0 ≤ r ≤ 0.05; 0 ≤ t ≤ 0.1; 0 ≤ d ≤ 0.5; p+q > 0.002; q+r > 0.002; and 2.8 ≤ x+y+p+r ≤ 3.2.

Inventors:
STARK MARTIN (DE)
Application Number:
PCT/EP2018/000440
Publication Date:
April 09, 2020
Filing Date:
September 20, 2018
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Assignee:
GIESECKE DEVRIENT CURRENCY TECH GMBH (DE)
International Classes:
C09K11/80; B42D25/00; G07D7/00
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