Security document with luminescent transition metal doping

• US 8,663,820 B2
• Filed: 03/05/2002
• Issued: 03/04/2014
• Est. Priority Date: 03/08/2001
• Status: Active Grant

• Current Assignee: Giesecke & Devrient (Giesecke & Devrient GmbH)
• Original Assignee: Giesecke & Devrient GmbH
• Inventors: Giering, Thomas, Stahr, Fritz, Hoppe, Rainer
• Primary Examiner(s): Tarazano, D. Lawrence
• Assistant Examiner(s): DICUS, TAMRA
• Application Number:
  US10/471,060
• Publication Number:
  US 20040105962A1
• Time in Patent Office: 4,382 Days
• Field of Search: 252/301.4 R, 252/301.36, 252/301.16, 252/301.4 S, 252/646, 252/301.17, 252/301.18, 252/301.21, 252/301.33, 428/690, 428/211.1, 428/67, 283/92, 283/901, 106/453, 106/451, 106/439, 106/436, 106/428, 106/733, 106/769, 106/31.14, 250/458.1, 250/301.6, 250/301.4 R, 250/301.4 H, 250/301.4 P, 250/301.4 F, 250/301.6 R, 250/601.6 P
• US Class Current: 428/690
• CPC Class Codes: B41M 3/144 using fluorescent, luminescent or iridescent effects
• CPC Class Codes: B42D 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/387 absorbing or reflecting ultraviolet light
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation
• CPC Class Codes: Y10T 428/22 Nonparticulate element embedded or inlaid in substrate and visible
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24934 including paper layer

Abstract

The invention relates to a printed document of value having at least one authenticity feature in the form of a luminescent substance based on doped host lattices. The host lattice has a strong crystal field and is doped with at least one chromophore with the electron configuration (3d)².

Claims

1. A document of value having at least one authenticity feature in the form of a luminescent substance including a host lattice doped with at least one transition metal ion having an electron configuration of 3d², said transition metal ion being a luminescence emitter.

2. A document of value according to claim 1, wherein the host lattice has a strong crystal field.

3. A document of value according to claim 1, wherein the transition metal ion is titanium in oxidation state 2 or vanadium in oxidation state 3 or chromium in oxidation state 4 or manganese in oxidation state 5 or iron in oxidation state 6.

4. A document of value according to claim 1, wherein the document of value consists of paper or plastic.

5. A document of value according to claim 1, wherein the authenticity feature is incorporated into the volume of the document of value or present in a layer applied to the document of value.

6. A document of value according to claim 1, wherein the luminescent substance is provided on the document of value as an invisible, at least partial coating.

7. A document of value according to claim 1, wherein the luminescent substance is admixed to a printing ink.

8. A document of value according to claim 1, wherein the coating has the form of one or more stripes.

9. A document of value according to claim 1, wherein the host lattice is additionally codoped with at least one representative from the group of rare earth metal cations.

10. A document of value according to claim 9, wherein the rare earth metal cation is selected from neodymium (Nd), holmium (Ho), erbium (Er), thulium (Tm) and ytterbium (Yb).

11. A document of value according to claim 1, wherein the host lattice is selected from the class of apatites, spodiosites, palmierites, forsterites, brushites, dahllites, ellestadites, francolites, monetites, morinites, whitlockites, wilkeites, voelckerites, pyromorphites, garnets, perovskites, silicates, titanates, vanadates, phosphates.

12. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Ba_aCa_bSr_cPb_dCd_e(P_fV_gAs_hSi_jS_kCr_lO₄)₃F_mCl_nBr_p(OH)_q]_x,

where

a+b+c+d+e=5;

f+g+h+j+k+l=1;

m+n+p+q=1;

x=1 or 2; and

a, b, c, d, e each range from 0 to 5; and

f, g, h, j, k, l, m, n, p, q from 0 to 1.

13. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Mg_aBa_bCa_cSr_dPb_eCd_f][P_gV_hAs_jSi_kS_lCr_m]O₄[F_nCl_pBr_q(OH)_r],

where

a+b+c+d+e+f=2;

g+h+j+k+l+m=1;

n+p+q+r=1; and

a, b, c, d, e, f each range from 0 to 2; and

g, h, j, k, l, m, n, p, q, r from 0 to 1.

14. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Mg_aBa_bCa_cSr_dPb_eCd_f][Si_gTi_hGe_j]O₄,

where

a+b+c+d+e+f=2;

g+h+j=1; and

a, b, c, d, e, f each range from 0 to 2, and

g, h, j from 0 to 1.

15. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Li_aNa_bK_cRb_d][P_eAs_fV_g]O₄,

where

a+b+c+d=3;

e+f+g=1; and

a, b, c, d each range from 0 to 3, and

e, f, g from 0 to 1.

16. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Y_aLa_b][Si_cTi_d]O₅,

where

a+b=2;

c+d=1; and

a, b each range from 0 to 2, and

c, d from 0 to 1.

17. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Ba_aCa_bSr_cPb_dCd_e](P_fV_gAs_hSi_jS_kCr_lO₄)₂,

where

a+b+c+d+e=3;

f+g+h+j+k+l=1; and

a, b, c, d, e each range from 0 to 3, and

f, g, h, j, k, l from 0 to 1.

18. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Ba_aCa_bSr_cPb_dCd_e](P_fV_gAs_hSi_jS_kCr_lO₄)₃Cl,

where

a+b+c+d+e=5;

f+g+h+j+1=1; and

a, b, c, d, e each range from 0 to 5, and

f, g, h, j, k, l from 0 to 1.

19. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Na_aK_bRb_cCs_d][S_eSe_fCr_gMo_h]O₄,

where

a+b+c+d=2;

e+f+g+h=1; and

a, b, c, d each range from 0 to 2, and

e, f, g, h from 0 to 1.

20. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Mg_aCa_bSr_cBa_d][S_eSe_fCr_gMo_hW_i]O₄,

where

a+b+c+d=1; and

e+f+g+h+i=1, and

a, b, c, d each range from 0 to 1, and

e, f, g, h, i from 0 to 1.

21. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Sc_aY_bLa_cCe_dPr_eNd_fPm_gSm_hEu_jGd_kTb_lDy_mHo_nEr_pTm_qYb_rLn_s][Al_uFe_vCr_x]O₃,

where

a+b+c+d+e+f+g+h+j+k+l+m+n+p+q+r+s=1;

u+v+x=1; and

a, b, c, d, e, f, g, h, j, k, l, m, n, p, q, r, s, u, v, x each range from 0 to 1.

22. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Y_aGd_bSc_cLa_dLn_e][Al_fFe_gCr_h]O₁₂

where

a+b+c+d+e=3;

f+g+h=5; and

a, b, c, d, e each range from 0 to 3, and

f, g, h from 0 to 5.

23. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

[Mg_aCa_bSr_cBa_d][Al_eCr_fFe_gGa_h]O₄,

where

a+b+c+d=1;

e+f+g+h=2; and

a, b, c, d each range from 0 to 1, and

e, f, g, h from 0 to 2

or a compound with the formula

[Mg_aCa_bSr_cBa_d][Al_eCr_fFe_gGa_h]O₇,

where a+b+c+d=1;

e+f+g+h=4; and

a, b, c, d each range from 0 to 1, and

e, f, g, h from 0 to 4.

24. A document of value according to claim 1, wherein the host lattice is a compound with the formula

Y₂[Si_aTi_bZr_c]O₇ or MgCa₂[Si_aTi_bZr_c]O₇,

where

a+b+c=2, and

a, b and c each range from 0 to 2.

25. A document of value according to claim 1, wherein the host lattice is a compound with the formula

[Ba_aCa_bSr_c][Si_dTi_cZr_f]O₅,

where

a+b+c=3;

d+e+f=1; and

a, b, c each range from 0 to 3 and

d, e, f from 0 to 1.

26. A document of value according to claim 1, wherein the host lattice is a compound with the formula

[Y_aLa_bZr_c][P_dSi_e]O₄,

where

a+b+c=1;

d+e=1, and

a, b, c each range from 0 to 1,

d, e from 0 to 1.

27. A document of value according to claim 1, wherein the host lattice is a compound with the formula:

K[Ti_2aZr_2b](PO₄)₃,

where

a+b=1, and

a, b each range from 0 to 1.

28. A document of value according to claim 1, wherein the transition metal ions are present in the host lattice in a tetraoxo configuration.

29. A document of value according to claim 1, wherein the luminescent substance is present as pigment particles.

30. A security element having a carrier material and at least one luminescent substance including a host lattice doped with at least one transition metal ion having an electron configuration of 3d², said transition metal ion being a luminescence emitter.

31. A security element according to claim 30, wherein the host lattice has a strong crystal field.

32. A security element according to claim 30, wherein the security element has the form of a stripe or band.

33. A security element according to claim 30, wherein the carrier material is formed as a security thread, planchet or mottling fiber.

34. A security element according to claim 30, characterized in that the security element is formed as a label.

35. A security element according to claim 30, characterized in that the at least one luminescent substance is embedded in the carrier material or applied to the carrier material.