EP3847038B1 - Élément de sécurité - Google Patents

Élément de sécurité Download PDF

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Publication number
EP3847038B1
EP3847038B1 EP19769381.5A EP19769381A EP3847038B1 EP 3847038 B1 EP3847038 B1 EP 3847038B1 EP 19769381 A EP19769381 A EP 19769381A EP 3847038 B1 EP3847038 B1 EP 3847038B1
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EP
European Patent Office
Prior art keywords
luminescent substance
layer
security element
value document
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19769381.5A
Other languages
German (de)
English (en)
Other versions
EP3847038A1 (fr
Inventor
Wolfgang Deckenbach
Thomas Giering
Stephan Steinlein
Johann Kecht
Thomas Happ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
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Publication of EP3847038A1 publication Critical patent/EP3847038A1/fr
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Publication of EP3847038B1 publication Critical patent/EP3847038B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/205—Matching spectral properties

Definitions

  • the present invention relates to a security transfer element (claimed), a document of value (claimed) with a security element layered composite, a method (claimed) for checking a document of value, a checking unit (not claimed), a value-document processing device (not claimed) and a system (not claimed). Checking unit and/or value document processing device and security transfer element and/or value document.
  • Documents of value are understood to mean objects in sheet form which represent, for example, a monetary value or an authorization and should therefore not be able to be produced by unauthorized persons at will. They therefore have features that are not easy to produce, and in particular not easy to copy, the presence of which is an indication of authenticity, i.e. production by an authorized body, or integrity. These features are often referred to as security elements. Important examples of such documents of value are chip cards, coupons, vouchers, checks and, in particular, banknotes, shares, tokens of value, identity cards, credit cards and passports, as well as labels, seals, packaging or other items for identification or value protection.
  • the security elements enable the authenticity of the document of value to be checked and also serve as protection against or identification of an unauthorized copy.
  • the security elements can be provided both individually and in the form of transfer tapes.
  • the transfer tapes have a large number of security elements designed as a security transfer element.
  • These security transfer elements include the security elements, which as a rule have a multilayer structure and are each referred to as a security element layered composite.
  • the security elements are prepared to form the security transfer element on a transfer layer, with the order of the layers of the respective Security element layer composite is reversed to the order in which it should later be on the object to be protected. When the security transfer element is transferred to the object to be protected, the transfer layer is usually removed, for example peeled off.
  • the security element layer composite On the side of the security transfer element opposite the transfer layer, the security element layer composite has an adhesive layer, for example a hot-seal adhesive, which is activated or, for example, melts upon transfer (application) of the security element layer composite to the document of value and glues the respective security element layer composite to the document of value.
  • the transfer tape with the hot-seal adhesive layer is placed on the document of value and pressed on, for example, by means of a heatable transfer stamp or a transfer roller and transferred to the object in the outline shape of the heated transfer stamp.
  • Transfer elements, transfer belts and the transfer of transfer elements to target substrates are, for example, in EP 0 420 261 B1 and WO 2005/108108 A2 describe.
  • the security transfer elements can be embossed and transferred from the transfer band according to a shape with the aid of the transfer stamp, for example. Instead of being shaped by the transfer stamp during the transfer process, individual security transfer elements can already be prefabricated on the transfer belt in the desired outline shape.
  • the document EP 1 880 864 B1 discloses a security transfer element.
  • the security transfer element has a carrier film.
  • An adhesive layer is arranged on both sides of the carrier film, with at least one adhesive layer being structured, so that the security transfer element conveys an optically variable impression to an observer when the viewing angle changes.
  • at least one of the adhesive layers includes a luminescent feature substance. A test of luminescence behavior of the security transfer element can be used to check the authenticity.
  • the DE 10 2008 049631 A1 discloses the preamble of claim 1 or claim 9 and describes a card with an embedded security feature.
  • the security transfer elements known from the prior art are suitable for using their luminescence behavior for authenticity testing.
  • the test result of the luminescence behavior depends on the document of value, for example on its imprint, substrate or soiling to which the security transfer element is applied.
  • the object is solved by a security transfer element, a document of value, a verification method according to the independent claims.
  • a security transfer element comprises a security element layered composite and a carrier film.
  • the carrier film is detachably connected to the security element layer composite.
  • the security element layered composite has a functional layer.
  • the functional layer has an optically variable effect that unfolds for an observer of the security element layer composite after the transfer to a document of value. This means that when viewed in incident light on a top side of the functional layer, a variable optical impression arises for a viewer depending on the viewing or illumination angle, for example a changed color impression, a moving pattern or a changed depth effect.
  • the security element layered composite comprises an adhesive layer.
  • the layered composite security element has an upper side which faces the viewer after the layered security element composite has been transferred to a value-document substrate.
  • the adhesive layer is arranged on the side of the functional layer that is opposite the upper side, namely on the underside of the security element layered composite.
  • the security element layered composite has at least one luminescent substance.
  • the luminescent substance is arranged in the adhesive layer and/or in a luminescent substance layer in the security element layer composite.
  • the luminescent substance layer is arranged on the side of the functional layer opposite the upper side, preferably between the adhesive layer and the functional layer.
  • the luminescent substance has a primary emission radiation in a wavelength range between 700 nm and 2100 nm.
  • the luminescent substance can be excited by excitation radiation in a wavelength range between 400 nm and 2100 nm, preferably between 700 nm and 2100 nm.
  • the functional layer is opaque with respect to the emission radiation of the luminescent substance.
  • opaque means that the transmittance is at most 50%, preferably at most 30%, particularly preferably at most 10%.
  • the functional layer is therefore designed in such a way that it prevents the radiation emitted by the luminescent substance in a wavelength range from 700 nm to 2100 nm to such an extent that it does not pass through the functional layer or only to a significantly small extent and is recognizable on the upper side of the security element layer composite is.
  • the functional layer can thus be designed to be absorbent or dampening and/or preferably reflective for the emission region of the luminescent substance. If the functional layer is designed to be damping, then a degree of damping of at least 50%, preferably 70%, particularly preferably more than 90%, is provided. In the case of a reflective functional layer, the degree of reflection is preferably more than 50%, particularly preferably more than 80%.
  • the excitation of the luminescent substance preferably takes place from the underside of the security element layered composite.
  • the at least one luminescent substance emits emission radiation. This runs through the security element layer composite up to the functional layer and preferably does not or hardly penetrates through the functional layer.
  • the emission radiation of the luminescent substance is not or only barely detectable on the upper side of the security element layered composite. the emission radiation can, however, be recognized from the underside of the security element layer composite, since the emission radiation of the luminescent substance can penetrate to the outside here.
  • the preferably wavelength-selective opacity of the functional layer can be provided by a partial layer of the functional layer.
  • the luminescent substance is particularly preferably arranged in the security element layer composite in such a way that it is arranged below the layer which provides the opacity of the functional layer, ie the luminescent substance is covered by opaque regions of the functional layer.
  • the security element layered composite is preferably detectable over its entire surface area using the luminescent substance. If the luminescent substance is arranged over the entire surface (in reflected light) of the security element layered composite, its completeness can be checked. With the methods of the prior art, the area of a document of value occupied by a layered security element composite is generally left out when checking, since checking is not or hardly possible due to the optical variability and/or metalized area. If the document of value is counterfeited, the security transfer element could only be partially removed. With the removal, the forger would also remove at least part of the luminescent substance from the document of value.
  • the security element layer composite is checked for completeness using, for example, an evaluation of the intensity distribution of the emission radiation of the luminescent substance on the checked surface of the value document, one would recognize that from the genuine value document only a partial area of the surface of the security element layer composite of the value document is provided with the luminescent substance.
  • the counterfeit document of value can also be identified using an area evaluation with regard to the intensity values of the emission radiation of the luminescent substance.
  • the luminescent substance cannot or can hardly be detected from the upper side of the security element layered composite. Rather, in particular, detection from the underside of the security element layered composite and thus from the value document substrate is possible.
  • the security element layer composite would not normally be recognized by counterfeiters as being machine-readable or as luminescent, since detection typically takes place from the top, but not from the bottom.
  • the layer of the security element layered composite is structured in such a way that when the security element layered composite is detached from a value-document substrate, only part of the luminescent substance is removed and another part remains on the value-document substrate. This can result from the material properties of the material surrounding the luminescent substance, for example a luminescent substance layer or adhesive layer, and/or this material is present in a specific geometric shape in the security element layer composite.
  • the forgery can also be detected with two-sided measurement for emission radiation of the luminescent substance in that the emission radiation would suddenly be detectable from above.
  • the emission radiation of the luminescent substance can comprise electromagnetic radiation with several emission bands, i.e. over a large range of wavelengths.
  • the concept of primary emission radiation therefore only relates to a specific wavelength range in which the intensity maximum lies and is the largest continuous wavelength range in which the total intensity does not fall below 90% of the maximum.
  • the luminescent substance of the security element layer composite can be excited by excitation radiation in a wavelength range between 400 nm and 2100 nm.
  • the structure and the safety regulations for this are simple and manageable, so that a simple check of the security element layered composite is possible.
  • the carrier film can be a plastic film made from PP, PET, PA, PC, PVC, PTFE or POM, for example.
  • the carrier film can also comprise a metal foil, for example Al, Cu or stainless steel foils.
  • the luminescent substance is arranged in a luminescent substance layer, one configuration can provide that the luminescent substance layer is in the form of a plastic layer. As a result, luminescent organic or organometallic dyes can be well dispersed and at the same time protected from chemical attack.
  • the luminescent substance is designed in such a way that its excitability to luminescence is in the visible spectral range, particularly preferably in the wavelength range between 400 nm and 700 nm Value document substrate and a higher susceptibility to disruptive factors such as dirt, but the range of substances that can be used has been expanded, for example pigments, dyes and complexes that can be excited with visible radiation. However, the losses can be more than compensated for in part by using the generally stronger excitation sources available for this spectral range.
  • the luminescent substance is designed in such a way that it can be excited in the infrared range, particularly preferably in the wavelength range between 700 nm and 2100 nm.
  • both the excitability and the emission are im infrared range.
  • the scattering losses that typically occur when the security element layer composite is applied to a value-document substrate that includes paper are minimized.
  • the scattering of the excitation radiation in a value document substrate, which includes paper decreases as the wavelength range increases.
  • absorptions occurring by z. B. pollution for electromagnetic radiation in the infrared range are often more permeable than in the visible range.
  • the security element layer composite is preferably designed in such a way that the luminescent substance can preferably be exposed to excitation radiation from the underside of the security element layer composite. That is to say, the layers which are arranged opposite one another from the luminescent substance on the upper side of the security element layered composite are transparent to the excitation radiation to such an extent that the excitation radiation can excite the luminescent substance to luminescence.
  • the excitation of the luminescent substance can take place from the upper side of the security element layered composite.
  • at least one layer and/or the material, which is arranged on the side of the luminescent substance which is directed towards the top side of the security element layer composite is designed in such a way that the excitation radiation can penetrate from the top side of the security element layer composite to the luminescent substance and can excite it to luminescence .
  • the at least one layer and/or the material can be designed such that it conducts electromagnetic radiation, namely the excitation radiation, only in the direction of the luminescent substance, but does not conduct electromagnetic radiation, namely the emission radiation, to the surface of the security element layer composite.
  • the layered security element composite can be designed in such a way that excitation radiation is blocked from the top side of the layered security element composite or from the bottom side of the layered security element composite.
  • the primary emission radiation of the luminescent substance is in a wavelength range between 900 nm and 2100 nm.
  • the luminescence of the security element layer composite cannot be perceived by the human eye, which means greater security is achieved.
  • the security transfer element is applied to a document of value substrate, the document of value substrate preferably containing paper, the emission radiation experiences fewer scattering losses due to the dependence of the scattering coefficient of the document of value substrate on the wavelength, so that the emission radiation of the luminescent substance can penetrate the document of value substrate with less loss.
  • the primary emission radiation of the luminescent substance is in a wavelength range between 900 nm and 1300 nm. Detectors of a simple design are already available for detecting emission radiation in this wavelength range, so that no complex detectors have to be used. A compromise is thus achieved between simple detectability and scattering losses.
  • luminescent substances are in a wavelength range of the primary emission radiation between 900 nm and 1300 nm doped inorganic pigments with the dopants neodymium or ytterbium or doped with certain transition metals and organometallic complexes with neodymium or ytterbium and / or organic dyes such.
  • cyanine dyes such as IR-1061 and / or indolium dyes such as IR-1048.
  • a combination of neodymium and ytterbium can also be provided.
  • the primary emission radiation of the luminescent substance is in a wavelength range between 1300 nm and 1600 nm.
  • the detectors can still be constructed relatively simply.
  • a broad absorption band can be present due to a superimposition of different O-H stretch vibrations, as a result of which the emission radiation of the luminescent substance is damped.
  • Inorganic pigments doped with erbium, organometallic complexes with erbium and/or certain organic dyes come into consideration as possible luminescent substances, for example.
  • the primary emission radiation of the luminescent substance is in the range between 1600 nm and 1850 nm.
  • the detector (sensor) and the detection method are more complex.
  • other materials are preferred to use, viz thulium-doped inorganic pigments and/or organometallic complexes with thulium
  • the primary emission radiation of the luminescent substance is in a wavelength range between 1850 nm and 2100 nm.
  • the security element layer composite in combination with a value document substrate that includes paper, compared to luminescent substances with primary emission below 1850 nm, but the detector shines and the detection method is time-consuming and complex.
  • the intensity of the luminescent substance also varies with the moisture content of the substrate, making detection even more complex.
  • Examples of luminescent substances that have a primary emission radiation in a wavelength range between 1850 nm and 2100 nm are holmium-doped inorganic pigments and/or organometallic complexes with holmium.
  • dopants mentioned here can be provided which, in combination with the rare earth ion, enable an energy transfer to the rare earth ion, for example erbium.
  • the dopants such as neodymium, ytterbium, erbium, thulium and/or holmium can be present in combination with one another and/or in combination with the other dopants mentioned, in order to set and/or omit energy transfer and its respective decay time.
  • the luminescent substance is a phosphorescent luminescent substance.
  • an increased number of codings is possible, namely in the differentiation of the security element layer composites used with different build-up or decay times.
  • the luminescent substance has a decay time of less than 5000 ⁇ s, particularly preferably less than 2000 ⁇ s, particularly preferably less than 1000 ⁇ s. This allows a more precise measurement of the respective decay time even at high transport speeds of the security element layered assembly during testing. This is e.g. This is the case, for example, with high-speed banknote sensors, where banknotes typically move through the machine at up to 12 meters per second.
  • the luminescent substance preferably has a decay time of more than 50 ⁇ s, particularly preferably of more than 80 ⁇ s, particularly preferably of more than 100 ⁇ s. With shorter decay times, it becomes increasingly difficult to distinguish background fluorescence, e.g. from organic contaminants.
  • the luminescent substance has no additional anti-Stokes emission, or one that can hardly be detected, ie less than 5% of the relative intensity. It can thus be prevented that the security element layer composite can be made visible in the human-visible wavelength range by irradiation using, for example, lasers or other devices for detecting upconversion.
  • the security element layered composite has a further luminescent substance.
  • the further luminescent substance is designed in such a way that it can be excited in a first wavelength range and has an emission in a second wavelength range which corresponds to the wavelength range for exciting the luminescent substance, the emission radiation of the further luminescent substance corresponding to the wavelength range for exciting the luminescent substance and this for luminescence stimulates.
  • the additional luminescent substance thus serves as an intermediate stage for exciting the luminescent substance.
  • the further luminescent substance preferably has a high Stokes shift or a high anti-Stokes shift.
  • the luminescent substance and further luminescent substance can be arranged in a common layer and/or in different layers of the security element layer composite.
  • the luminescent substance can be an organic or organometallic luminescent substance, for example fluorescent organic molecules or phosphorescent organometallic complexes. This makes it particularly easy to incorporate into polymers and into thin layers, since z. B. the substances in it can be molecularly distributed and thus no problems arise due to excessive pigment grain sizes.
  • organometallic complexes are organometallic complexes. These generally show narrower, more specific emission bands and a large Stokes shift. This facilitates excitation and detection. In particular, the separation of the emission radiation from the excitation radiation and from interference signals is facilitated.
  • the organometallic complexes are preferably rare earth complexes, particularly preferably rare earth complexes of the rare earths neodymium, ytterbium, erbium, thulium, holmium or combinations of these two or more rare earths.
  • the luminescent substance has a low Stokes shift in relation to wavelength ranges of excitability and emission.
  • the luminescent substance is an inorganic luminescent substance.
  • these are doped inorganic matrices (host lattice).
  • the dopants can be the rare earths neodymium, ytterbium, erbium, thulium, holmium or the transition metals vanadium, chromium, manganese, iron.
  • other dopants may also be present, e.g. B. to set the decay time of the luminescent and / or to use energy transfer between the rare earth ion and / or the transition metal and the other dopant.
  • the security element layer composite can comprise further luminescent substances in addition to the luminescent substance, in particular according to one of the luminescent substances described here.
  • the at least one luminescent substance of the security element layered composite is an inorganic luminescent substance.
  • the simultaneous detection of the luminescent substances is facilitated, since their behavior can be better matched to one another, in particular in their phosphorescence decay time and/or emission width.
  • the at least one luminescent substance can have a particle size (D99) of less than 15 ⁇ m.
  • the particle size (D99) is preferably less than 8 ⁇ m, particularly preferably less than 5 ⁇ m.
  • a grain size of 5 ⁇ m or less is also advantageous, since otherwise the layers above or below the adhesive layer can be impaired by the protruding luminescent substance.
  • the indication of grain size D99 means that 99% of the particles used in the layer, for example in the adhesive layer and/or in the luminescent substance layer, have a maximum grain size, for example 5 ⁇ m.
  • the concentration of the luminescent substance is preferably less than 5 percent by weight of the material in which it is contained, particularly preferably less than 1 percent by weight. If, for example, the luminescent substance is introduced into the adhesive of an adhesive layer and/or into the adhesive layer, then particularly preferably less than 1 percent by weight of the adhesive consists of the luminescent substance. This can be achieved by using a particularly efficient luminescent substance. This ensures that the function of the material in the security element layer composite, here e.g. the adhesive effect of the adhesive, is not adversely affected by the luminescent substance.
  • the luminescent substance has a coating and/or a functionalization in order to improve its incorporation.
  • a coating and/or a functionalization in order to improve its incorporation.
  • an inorganic luminescent substance with a organic shell or an organic surface functionalization are provided in order to enable or improve a dispersion of the luminescent substance in a polymer layer or the adhesive layer.
  • the luminescent substance has a similar, preferably the same, refractive index as the material surrounding it, for example a polymer layer and/or the adhesive layer.
  • the refractive indices preferably differ from one another by less than 30%, particularly preferably by less than 10%. This ensures that the introduction of the luminescent substance does not lead to optical effects such as turbidity, etc., which could impair the functionality of the security element layered composite.
  • the luminescent substances can be coated with the refractive index n 1 ⁇ n 0 n 2 be provided with a defined thickness.
  • the coating thickness must be designed in such a way that the light beams reflected by the luminescent substance and the coating destructively overlap in the spectral range of the highest eye sensitivity (approx. 555 nm) with a phase difference of ⁇ .
  • the refractive index of the adhesive layer can be adjusted by opacifying materials or dopings in such a way that its refractive index is increased. For example, clouding of the layer of adhesive, the layer of luminescent substance and/or that surrounding the luminescent substance Matrix and/or layer with corresponding materials such as TiO 2 or other oxides are increased and preferably the scattering is reduced.
  • the functional layer has reflective properties.
  • the functional layer can be formed with a reflective surface, preferably on the side of the functional layer which is opposite the upper side, or have a coating on the upper side of the functional layer.
  • the reflective property relates in particular to electromagnetic radiation in a wavelength range of the excitability and/or the emission radiation of the luminescent substance of the security element layered composite.
  • the luminescent substance is arranged underneath, i.e. on the side of the functional layer which is opposite the upper side.
  • the reflection of the reflective surface causes an increase in intensity of the excitation radiation from the bottom of the luminescent, since z. B.
  • the scattered excitation radiation can hit the luminescent substance several times, and thus an increase in intensity of the emission radiation of the luminescent substance on the underside of the security element layer composite.
  • the reflective property of the functional layer causes the emission radiation of the luminescent substance to be reflected toward the top, so that emission of the luminescent substance in areas in which the functional layer has reflective properties is prevented or reduced on the top side of the security element layer composite.
  • the reflection of the emission radiation of the luminescent substance brings about an increase in intensity toward the underside of the security element layered assembly.
  • the functional layer can have the reflective property over the entire planar surface of the functional layer (apart from end faces). Furthermore, it is also possible for only one flat side of the functional layer include reflective properties. In addition, the reflective property can also extend only in regions over a (partial) area of the functional layer, and can be designed, for example, as a pattern.
  • the functional layer can have a reflective coating, a reflective imprint and/or a reflective partial layer.
  • the functional layer can be designed as a reflective metal layer and/or have a reflective metal coating.
  • the metal layer and/or the metal coating is/are preferably arranged on the side of the functional layer which is opposite the observer and thus the upper side of the security element layered composite.
  • the metal layer and/or metal coating is an aluminum and/or chromium-based layer or coating.
  • the functional layer that develops the optically variable effect can be designed as a reflective embossed structure, in particular a diffractive structure and/or a reflective microstructure, and/or transparent layers with a high refractive index, thin-layer elements with a color shift effect, in particular with a reflective layer and a semi-transparent layer and one in between arranged dielectric layer, layers made of liquid-crystalline material, in particular made of cholesteric liquid-crystalline material, printed layers based on effect pigment compositions with a viewing angle-dependent effect or with different colors and/or a multilayer structure, for example two semitransparent layers and a dielectric layer arranged between the two semitransparent layers .
  • the functional layer of the security element layered composite has an embossing lacquer, for example for forming an embossing structure, on.
  • the embossing lacquer of the security element layered composite can already have an embossing structure.
  • the luminescent substance can be formed in the embossing lacquer, with the embossing lacquer on the upper side of the security element layered composite preferably being embodied as reflecting and/or absorbing for the emission radiation of the first luminescent substance.
  • the security element layer composite can have a scattering layer with light-scattering properties.
  • the intensity of the excitation radiation, which the luminescent substance experiences, is increased with the help of the scattering layer.
  • the scattering layer can be designed as a foil with embedded reflective interference particles.
  • the scattering layer can be designed, for example, as a polymer layer with embedded cellulose fibers and/or with high-index inorganic scattering bodies, for example TiO 2 and/or ZrO 2 .
  • the scattering layer is arranged adjacent to the layer in which the luminescent substance is arranged, for example an adhesive layer or a luminescent substance layer.
  • the luminescent substance is arranged in the scattering layer and/or the scattering layer is part of the functional layer.
  • the scattering layer can be arranged between the adhesive layer and the luminescence substance layer.
  • plastic layers can be used to adjust the thickness of the security element layer composite, to adjust distances between different layers of the security element layer composite, and/or to influence other properties of the security element layer composite, such as e.g. B. the opacity, the color and / or the deformability of the security element layered composite.
  • the security element layer composite can comprise an embossing varnish, a protective varnish, a primer, a printed layer and/or further security elements or a combination of the features mentioned here.
  • the luminescent substance is located in an adhesion promoter layer or in a primer of the security element layer composite. In a further preferred embodiment, the luminescent substance is located in the adhesive layer.
  • the introduction of the luminescent substance into the security element layered composite is particularly simple and significantly less error-prone. For example, the incorporation and homogeneous dispersion of an inorganic luminescent substance in an adhesive (eg by stirring) is easier than in a plastic layer, since the production process could be impeded when the luminescent substance is introduced into the polymer melt of a blown film extrusion.
  • the at least one luminescent substance or different, possibly complementary luminescent substances for example the further luminescent substance and/or luminescent substances introduced to detect individual layers, in particular with regard to its layers
  • a special evaluation of the detected radiation with regard to the spectral range can be used, for example, to detect the structure or the layer sequence of the security element layered composite.
  • the scattering behavior and/or luminescence behavior of a value document substrate for example a paper layer, on which the security element layer composite is applied, can also be included.
  • the luminescent substance can be arranged at least only in regions in the functional layer and/or adhesive layer, for example in the form of a pattern.
  • the pattern can be a code, in particular a barcode and/or a 2D code, for example a QR code or a data matrix code. It is thus possible, in addition to the proof of authenticity based on the emission radiation of the luminescent substance, to also obtain data and/or a further proof of authenticity with regard to the evaluation of the data and/or the pattern from the emission radiation.
  • the opacity of the security element layer composite can extend beyond the pattern of the luminescent substance or the area formed by the luminescent substance and thus completely cover the luminescent substance.
  • the opacity of the security element layer composite covers the pattern of the luminescent substance or the area formed by the luminescent substance only in certain areas and at least a partial area of the security element layer composite is designed in such a way that emission radiation of the luminescent substance emerges from the top side of the security element layer composite.
  • the opacity of the security element layer composite can extend in a pattern in the security element layer composite such that it forms a common pattern, in particular a coding, with the distribution of the luminescent substance, in particular the pattern of the luminescent substance or the area formed by the luminescent substance.
  • the opaque surface area of the security element layered composite can be designed as above as an optically variable effect and can include, for example, a hologram and/or an embossed pattern and/or be designed as a line, in particular a line grid, as a surface pattern and/or as a metallized surface with demetallization and cover the arrangement of the luminescent substance in incident light on the upper side at least in an overlapping area. Accordingly, it can be provided that the security element layered composite in Incident light has at least one area on the upper side in which the security element layer composite is not opaque to the emission radiation of the luminescent substance.
  • the security element layer composite is designed such that the security element layer composite has areas in incident light on the upper side of the security element layer composite from which the emission radiation of the luminescent substance cannot escape or can hardly be detected, and has regions from which the emission radiation of the luminescent substance can escape.
  • the security element layered composite has a pull-off protection.
  • the luminescent substance is arranged in a layer of the security element layer composite which is suitable for remaining wholly or partially on the value document when the security element layer composite is pulled off or detached from the document of value.
  • This can be, for example, a specially prepared adhesive layer between the security element layered composite and the value document substrate.
  • the document of value still contains the layer with the luminescent substance of the security element layered composite, but no longer the layer with the optically variable effect, preferably no longer the reflecting or absorbing layer, so that the intensity of the detectable emission radiation on the side on which the entire security element layered composite originally was attached is now higher and appears even faint on the opposite side. Improper removal (forgery) of the security element layered composite can thus be detected.
  • a document of value comprises a flat value document substrate and a security element layered composite, which is arranged on an upper side of the flat value document substrate.
  • the security element layered composite has a functional layer which, when viewed in incident light, develops an optically variable effect on a top side of the functional layer for a viewer, with the top side then facing the viewer.
  • the security element layered composite comprises an adhesive layer.
  • the security element layered composite has an upper side, which faces the viewer, and an underside, which faces the value document substrate and is opposite the upper side.
  • the security element layered composite also has at least one first luminescent substance.
  • the first luminescent substance can be arranged in the adhesive layer and/or in a first luminescent substance layer, which is preferably arranged on the side of the functional layer in the security element layer composite opposite the upper side of the security element layer composite.
  • the adhesive layer is arranged on the side of the security element layer composite and the functional layer that is opposite the upper side of the security element layer composite.
  • the security element layer composite is arranged on an upper side of the value document substrate in such a way that the functional layer developing the optically variable effect is aligned in such a way that the optically variable effect can be seen in incident light on an upper side of the value document and the security element layer composite in incident light on an underside of the value document, at least in regions, is preferably completely covered.
  • More than 10% of the area of the security element layer composite is preferably covered by the value document substrate when viewed from the underside of the value document. This enables a mechanically secure anchoring of the security element layered composite and an attractive design and a high protection against counterfeiting due to different optical impressions of the security element from the top and bottom of the document of value.
  • the security element layered composite and the value-document substrate can overlap completely or only partially, for example in a window area of the value-document substrate.
  • the first luminescent substance has a primary emission radiation in a wavelength range between 700 nm and 2100 nm. Furthermore, the first luminescent substance can be excited by excitation radiation in a wavelength range between 400 nm and 2100 nm, preferably between 700 nm and 2100 nm.
  • the functional layer is opaque with respect to the emission radiation of the first luminescent substance. The structure and the security provisions for this are simple and clear, so that a simple check of the security element layer composite and the document of value is possible.
  • the opacity of the functional layer can be provided by a partial layer of the functional layer.
  • the first luminescent substance is arranged in the security element layer composite in such a way that it is arranged below the layer which provides the opacity of the functional layer, i. This means that the luminescent substance is arranged at least on the side of the opaque layer which is opposite the upper side of the security element layered composite.
  • the functional layer is therefore designed in such a way that it prevents the radiation emitted by the first luminescent substance in a wavelength range from 700 nm to 2100 nm to such an extent that it does not or only to a significantly small extent pass through the functional layer and thus to the upper side of the Security element layer composite is not or hardly detectable.
  • the functional layer can thus be used for the emission area of the first luminescent substance can be designed to be absorbent or damping, preferably reflective. If the functional layer is designed to be damping, then a degree of damping of at least 50%, preferably at least 70%, particularly preferably at least 100%, is provided.
  • the degree of reflection is preferably more than 50%, particularly preferably more than 80%.
  • the intensity of the emission radiation of the first luminescent substance contained in the security element layer composite is therefore higher on the side of the value document which does not carry the security element layer composite than on the side of the value document which carries the security element layer composite, preferably by at least 50% higher, particularly preferably by at least 70%. more preferably by at least 100%.
  • the excitation of the first luminescent substance preferably takes place from the underside of the security element layered composite, in particular from the underside of the document of value or the document of value substrate.
  • the first luminescent substance emits emission radiation. This runs through the security element layer composite up to the functional layer and preferably does not or hardly penetrates through the functional layer.
  • the emission radiation of the first luminescent substance is not or only barely detectable on the upper side of the security element layered composite. In contrast, the emission radiation can penetrate to the underside of the security element layered composite and thus also into the value document substrate.
  • the value-document substrate is preferably designed in such a way that the emission radiation of the first luminescent substance essentially, i.e. taking into account any scattering losses that may be present, a high proportion of the emission radiation, in particular a proportion sufficient for detection, penetrates the value-document substrate, as a result of which the emission radiation of the first luminescent substance can be determined.
  • the surface area of the document of value occupied by the security element layered composite, but at least the surface area occupied by the first luminescent substance, can thus be recognized. If the document of value is counterfeited, the security element layer composite could only be partially removed. With the removal, the counterfeiter could also remove at least part of the first luminescent substance from the authentic document of value. When examining the document of value with regard to the completeness of the layered security element composite, one would recognize from the two-dimensional intensity distribution of the emission radiation of the first luminescent substance that of the genuine document of value only a portion of the surface of the layered security element composite that would normally be present is covered by the layered security element composite.
  • the first luminescent substances cannot or can hardly be detected from the upper side of the security element layered composite. Rather, in particular, detection from the underside of the security element layered composite and thus from the value document substrate is possible.
  • the security element layered composite would usually not be considered machine-readable or luminescent by counterfeiters detected, since detection typically takes place from the top, but not from the bottom.
  • a forger could remove the security element layer composite from the value document in such a way that at least part of the functional layer, which relates to the optically variable effect, is removed, with at least part of the first luminescent substances remaining on the value document substrate.
  • a surface check of the intensity curve in reflected light on the top of the document of value with regard to emission of the first luminescent substances could be used, with emission radiation of the remaining first luminescent substance being partially recognizable on the top of the document of value in the area that typically has the security element layer composite were.
  • none or a small but essentially homogeneously distributed emission radiation of the first luminescent substance would be recognizable.
  • the security element layer composite used in the document of value can be provided by a security transfer element, as described above.
  • the value document substrate on which the security element layer composite is arranged can consist of paper, plastic or a composite of paper and plastic. This is preferably the case Document of value, however, is banknote paper/cotton paper or a composite material containing such paper.
  • the value document substrate is typically 50-100 ⁇ m thick and, for example in the case of a bank note, consists of paper, typically mainly of cellulose fibers, inorganic fillers such as titanium dioxide and organic additives such as CMC (carboxymethyl cellulose).
  • the fillers produce a high degree of scattering of the value document substrate and thus an attractive white color impression.
  • they enable good excitation of the first and/or second luminescent substance, since a high capture cross-section of the luminescent centers of the first and/or second luminescent substance is ensured.
  • the value-document substrate can comprise at least one plastic film (for example polymer banknotes), but preferably a composite of at least two plastic films.
  • Value document substrates with a plastic film can have a higher transparency, as a result of which easier excitation of the first luminescent substances is possible.
  • the value document substrate can also have a more complex structure, and e.g. B. in the case of a composite material that includes at least one plastic film or a plastic core surrounded by at least two layers of paper, or contain at least one layer of paper surrounded by at least two plastic films (so-called hybrid banknotes).
  • the value-document substrate thus forms the main body of the value-document and, due to its thickness and its scattering and absorption properties, is a relevant factor for the attenuation of the excitation radiation and emission radiation of the luminescent substances used within the scope of the invention, in particular the first luminescent substance, which in each case has to traverse the value-document substrate.
  • At least the average intensity of the emission radiation of the first luminescent substance of the security element layer composite on the underside of the value document is significantly higher than on the upper side of the value document, in each case in the surface area of the security element layer composite, with preferably no or negligible emission radiation of the first luminescent substance on the Top of the value document can be seen.
  • the functional layer and/or layers above the first luminescent substance are designed for the emitted radiation of the first luminescent substance in such a way that they prevent it from penetrating. An attenuation of at least 50% is considered significant.
  • the functional layer can thus be designed to be absorbent or damping, preferably reflective, for the emission region of the luminescent substance.
  • An attenuating embodiment of the functional layer offers the advantage that the attenuation in the infrared emission range of the luminescent substance can be generated independently of the visual impression, so that there is great freedom in the design of the visual impression of the security element layer composite.
  • a reflective design can itself act as an attractive design feature, and is a necessary part of some optically variable elements such as a hologram.
  • the functional layer is designed to be damping, then a degree of damping of at least 50%, preferably at least 70%, particularly preferably at least 100%, is provided.
  • the degree of reflection is preferably more than 50%, particularly preferably more than 80%. It is thus possible to reliably check the value document and/or the security element layered assembly for forgery and/or for snippet forgery, ie that an area of a genuine value document has been removed and possibly replaced by a fake area.
  • the value document substrate has at least one second luminescent substance.
  • the at least one second luminescent substance can be arranged in the value document substrate, for example in a paper substrate layer and/or in a polymer layer.
  • the second luminescent substance is added to the paper pulp in a paper machine, for example for the production of the paper substrate layer.
  • the value-document substrate comprises a polymer layer
  • the second luminescent substance can be admixed in an extruder.
  • the value document substrate can also comprise a combination of paper substrate and polymer layer.
  • the second luminescent substance can be formed in a printed layer on the value-document substrate.
  • the second luminescent substance can be incorporated in a printing ink.
  • the security element layer composite is removed from the value document substrate by detachment with solvents and is applied to a forged value document substrate in order to make it appear authentic (for example on an altered document or a bank note with a higher denomination).
  • the at least first luminescent substance in the security element layer composite and the at least second luminescent substance in and/or on the value document substrate are preferably matched to one another.
  • the first and possibly second luminescent substance are designed in such a way that they can be excited by excitation radiation in the visible spectral range, which is particularly preferred in the wavelength range between 400 nm and 700 nm.
  • excitation radiation for excitation through a value document substrate, which includes paper
  • higher scattering losses occur in the value document substrate and a higher susceptibility to disruptive factors such as dirt
  • the range of substances that can be used is expanded, for example pigments, dyes and complexes excitable with visible radiation.
  • the losses can be more than compensated for in part by using the generally stronger excitation sources available for this spectral range.
  • the first and second luminescent substance can be excited in the same wavelength range, for example in the visible and/or infrared wavelength range. This enables both luminescent substances to be tested with a space- and energy-saving sensor that only provides excitation light of one wavelength.
  • the first and/or possibly second luminescent substance of the document of value is designed in such a way that it can be excited by excitation radiation in the infrared range, particularly preferably in the wavelength range between 700 nm and 2100 nm.
  • both the excitation radiation and the emission are in the infrared range.
  • the primary emission radiation is from the first and/or possibly second luminescent substance of the document of value in a wavelength range between 900 nm and 2100 nm.
  • the luminescence of the security element layer composite cannot be perceived by the human eye, which means that greater security is achieved.
  • the security element layer composite on the value document substrate which preferably contains paper, experiences fewer scattering losses due to the dependence of the scattering coefficient of the value document substrate on the wavelength, so that the emission radiation of the first and/or possibly second luminescent substance can penetrate the value document substrate with less loss.
  • the primary emission radiation of the first and/or optionally luminescent substance is in a wavelength range between 900 nm and 1300 nm.
  • Simply constructed detectors are already available for detecting emission radiation in this wavelength range, so that no complex detectors have to be used. A compromise is thus achieved between simple detectability and scattering losses.
  • the first and second luminescent substance with a wavelength range of the primary emission radiation between 900 nm and 1300 nm doped inorganic pigments with the dopants neodymium or ytterbium or doped with certain transition metals and organometallic complexes with neodymium or ytterbium and / or organic dyes such.
  • cyanine dyes such as IR-1061 and / or indolium dyes such as IR-1048.
  • a combination of neodymium and ytterbium can also be provided.
  • a combination of neodymium and ytterbium can also be provided
  • the primary emission radiation of the first and/or possibly second luminescent substance is in a wavelength range between 1300 nm and 1600 nm.
  • the detectors can still be relatively be easy to set up.
  • Inorganic pigments doped with erbium, organometallic complexes with erbium and/or certain organic dyes come into consideration as the first and/or optionally second luminescent substance.
  • the primary emission radiation of the first and/or optionally second luminescent substance is in the range between 1600 nm and 1850 nm.
  • the scattering losses in the value-document substrate, which includes paper are again reduced , given.
  • both the detector and the detection method are more complex.
  • the primary emission radiation of the first and/or second luminescent substance is in a wavelength range between 1850 nm and 2100 nm Emission below 1850 nm is very low, but the detector and the detection method would be more complex and complex.
  • a further disadvantage is that in this wavelength range there are vibrational overtones of the water, so that the intensity of the first and/or possibly second luminescent substance also varies with the moisture content of the substrate, making detection even more complex.
  • the first and/or optionally second luminescent substance which has a primary emission radiation in a wavelength range between 1850 nm and 2100 nm are, for example, holmium-doped inorganic pigments and/or organometallic complexes with holmium.
  • dopants mentioned here can be provided which, in combination with the rare earth ion, enable an energy transfer to the rare earth ion, for example erbium.
  • the dopants such as neodymium, ytterbium, erbium, thulium and/or holmium can be present in combination with one another and/or in combination with the other dopants mentioned, in order to set and/or omit energy transfer and its respective decay time.
  • the first and second luminescent substance overlap at least partially in a wavelength range of their emission radiation; in particular, the emission wavelength range of the second luminescent substance can match that of the first luminescent substance.
  • the first luminescent substance of the security element layer composite can no longer be examined, or only with difficulty, independently of the second luminescent substance of the value document substrate, which is preferably present over the entire surface.
  • the wavelength ranges of the emission of the first and second luminescent substance complement one another and/or overlap in some areas.
  • the supplementary spectrum can also be used as security evidence, in particular whether the first and second luminescent substances are present in the detected surface area.
  • the complementary and optionally overlapping spectrum can be determined using the amount and type of first and second luminescent substances used.
  • the first and second luminescent substances luminesce in different spectral ranges. This achieves a higher number of separable codings. Furthermore, a separate evaluation of the emissions is easier.
  • the first and/or second luminescent substance is phosphorescent.
  • the decay time of the respective emission can also be determined. This provides increased security, since a counterfeiter would have to imitate the behavior over time.
  • an increased number of codings is possible, namely in the differentiation of the security element layer composites with different attack or decay times.
  • the first and/or second luminescent substance has a decay time of less than 5000 ⁇ s, particularly preferably less than 2000 ⁇ s, particularly preferably less than 1000 ⁇ s. This allows a more precise measurement of the respective decay time even at high transport speeds of the document of value. This is e.g. B. in high-speed sensors This is the case for banknotes, where banknotes typically move through the machine at up to 12 meters per second.
  • the first and/or second luminescent substance preferably has a decay time of more than 50 ⁇ s, particularly preferably of more than 80 ⁇ s, particularly preferably of more than 100 ⁇ s. With shorter decay times, it becomes increasingly difficult to distinguish background fluorescence, e.g. from organic contaminants.
  • first and second luminescent substances emit in a similar wavelength range, ie both substances emit together in one of the spectral ranges mentioned here, such as 1300 nm - 1600 nm, 1600 nm - 1850 nm and 1850 nm - 2100 nm Wavelength ranges is achieved in each case that the first and second luminescent substance emit in the same spectral range.
  • security can be increased since it becomes more difficult, particularly in the long-wave ranges, to use the first and second luminescent substances independently of one another to detect.
  • the detector design is simplified, especially in the short-wave ranges, since only a limited range has to be checked.
  • the first and second luminescent substances are selected in such a way that they emit in different spectral ranges. As a result, more codes can be generated. Furthermore, the separate evaluation of the emissions is technically simpler.
  • the first and the second luminescent substance have a common excitation.
  • the first and second luminescer are excited via the same rare earth ion, but emit via different rare earth ions.
  • the first luminescent substance contains neodymium and the second luminescent substance contains neodymium and ytterbium at the same time.
  • the first luminescent substance is excited in the neodymium and emits via the neodymium.
  • the second luminescent substance is excited in the neodymium and emits after an energy transfer via the ytterbium.
  • both substances can be excited by a common wavelength, which simplifies the process.
  • security is increased due to more complex luminescent substances.
  • the first and second luminescent substance are matched to one another in such a way that the wavelength range of the emission radiation and/or wave range for exciting the second luminescent substance essentially corresponds to the wavelength range of the emission radiation and/or the wave range for exciting the first luminescent substance of the security element layer composite.
  • the first luminescent substance can have a luminescent behavior that is complementary to that of the second luminescent substance. This means that the luminescence of the first luminescent substance differs in terms of its excitation, its emission and/or its decay. As a result, the two luminescent substances can be detected separately from one another and used for authenticity testing.
  • the first and/or possibly second luminescent substance has no additional anti-Stokes emission, or only one that is hardly detectable, i.e. less than 5% of the relative intensity. It can thus be prevented that the document of value can be made visible in the wavelength range visible to humans by irradiation using, for example, lasers or other devices for detecting upconversion.
  • the first and/or optionally second luminescent substance can be organic or organometallic luminescent substances, for example fluorescent organic molecules or phosphorescent organometallic complexes. This makes it particularly easy to incorporate into polymers and thin layers, since z. B. the substances in it can be molecularly distributed and thus no problems arise due to excessive pigment grain sizes.
  • the first and/or optionally the second luminescent substance is an organometallic complex.
  • organometallic complexes are preferably rare earth complexes, especially preferably rare earth complexes of the rare earths neodymium, ytterbium, erbium, thulium, holmium.
  • the first and/or optionally second luminescent substance is an inorganic luminescent substance.
  • these are doped inorganic matrices (host lattice).
  • the dopants can be the rare earths neodymium, ytterbium, erbium, thulium, holmium or the transition metals vanadium, chromium, manganese, iron.
  • other dopants may also be present, e.g. B. to set the decay time of the first and / or optionally second luminescent substance or to use energy transfer.
  • the first and/or optionally second luminescent substance is an inorganic luminescent substance. This facilitates the simultaneous detection of the luminescent substances, since their behavior can be better matched to one another, in particular in terms of their phosphorescence decay time and/or emission width.
  • the first luminescent substance of the security element layer composite and/or the second luminescent substance of the value document substrate can comprise at least two of the luminescent substances described here.
  • the first luminescent substance is an organic or organometallic luminescent substance and the second luminescent substance is an inorganic luminescent substance, or vice versa.
  • inorganic luminescent substances are suitable better for full-surface introduction into the value document substrate, in particular into a paper layer of cellulose-based value documents.
  • the first and second luminescent substance can have a grain size (D99) of less than 15 ⁇ m.
  • the particle size (D99) is preferably less than 8 ⁇ m, particularly preferably less than 5 ⁇ m.
  • the smaller grain size makes it easier to introduce the first and/or possibly second luminescent substance into the security element layer composite or into the value-document substrate without disruption.
  • a grain size of 5 ⁇ m or less is also advantageous, since otherwise the layers above or below the adhesive layer can be impaired by the protruding luminescent substance.
  • the indication of the particle size distribution D99 means that 99% of the particles used in the layer, for example in the adhesive layer and/or in the luminescent substance layer, have a maximum particle size, for example 5 ⁇ m.
  • the concentration of the first and/or optionally second luminescent substance is preferably less than 5 percent by weight of the material in which it is contained, particularly preferably less than 1 percent by weight. If, for example, the first and/or optionally second luminescent substance is introduced into the adhesive of an adhesive layer and/or in the adhesive layer or in the document of value substrate, it is particularly preferred that less than 1 percent by weight of the surrounding material, for example the adhesive, consists of the first or optionally second luminescent substance. This can be achieved by using particularly efficient luminescent substances. This ensures that the function of the material in the security element layer composite, here for example the adhesive effect of the adhesive, is not adversely affected by the first luminescent substance.
  • the security element layer composite is formed in such a way that, in particular in the adhesive layer, poorly adhering surface areas formed with luminescent substances are combined with strongly adhering areas formed without luminescent substances and in particular form a pattern in order, for example, to achieve a targeted detachment behavior of the security element layer composite from the value document substrate to describe and/or to enable a targeted separation of the security element layer composite when the luminescent substances are arranged in an intermediate layer of the security element layer composite, for example in the luminescent substance layer.
  • the first luminescent substance has a coating and/or a functionalization in order to improve its incorporation.
  • an inorganic luminescent substance can be provided with an organic shell or an organic surface functionalization in order to enable or improve its dispersion in a polymer layer or the adhesive layer.
  • the first and/or optionally the second luminescent substance have a similar, preferably the same, refractive index as the material surrounding it, for example a polymer layer and/or the adhesive layer.
  • the refractive indices preferably differ from one another by less than 30%, particularly preferably by less than 10%. This ensures that the introduction of the first and/or possibly second luminescent substance does not lead to optical effects such as turbidity, etc., which would impair the functionality of the document of value, particularly in the area of the security element layered composite.
  • the first and/or optionally second luminescent substance can be coated with the refractive index n 1 ⁇ n 0 n 2 be provided with a defined thickness.
  • the coating thickness must be designed in such a way that the light beams reflected on the first and/or possibly second luminescent substance and on the coating are destructively superimposed in the spectral range of the highest eye sensitivity (approx. 555 nm) with a phase difference of ⁇ .
  • the functional layer of the security element layered composite has reflective properties.
  • the functional layer can be formed with a reflective surface, preferably on the side of the functional layer which is opposite the upper side.
  • the reflective property relates in particular to electromagnetic radiation in a wavelength range of the emission radiation of the first luminescent substance of the security element layered assembly.
  • the first luminescent substance is arranged below, ie on the side of the functional layer that is opposite the top.
  • the reflection of the reflective surface causes an increase in intensity of the excitation radiation from the bottom to the first luminescent substance, since z. B. scattered excitation radiation can hit the first luminescent substance several times, and an increase in intensity of the emission radiation of the first luminescent substance cause on the underside of the security element layered composite.
  • the reflective property of the functional layer causes the emission radiation of the first luminescent substance to be absorbed towards the top, so that the emission of the first luminescent substance is prevented or reduced in areas in which the functional layer has reflective properties.
  • the functional layer of the security element layer composite can have the reflective property over its entire planar surface (apart from end faces). Furthermore, only one flat side of the functional layer can have reflective properties. A full-area implementation of the reflective property enables the optically variable effect to be easily recognized over the entire surface of the security element layered composite. In addition, the reflective property can also extend over a surface of the functional layer only in certain areas and can be designed, for example, as a pattern.
  • the functional layer can have a reflective coating, a reflective imprint and/or a reflective partial layer. For example, the functional layer can be designed as a reflective metal layer and/or have a reflective metal coating. This is an attractive design element and robust against environmental influences.
  • the metal layer and/or the metal coating is/are preferably arranged on the side of the functional layer which is opposite the observer and thus the upper side of the security element layered composite.
  • the metal layer is protected against abrasion and can have a height profile, for example in order to form a reflective embossed structure.
  • the metal layer and/or metal coating is an aluminum and/or chromium-based layer or coating.
  • the functional layer of the security element layer composite that develops the optically variable effect can be designed as a reflective embossed structure, in particular a diffractive structure and/or a reflective microstructure, and/or transparent, high-index layers, thin-layer elements with a color shift effect, in particular with a reflective layer and a semitransparent layer, as well as a dielectric layer arranged in between, layers made of liquid-crystalline material, in particular made of cholesteric liquid-crystalline material, printed layers based on effect pigment compositions with a viewing angle-dependent effect or with different colors and/or a multilayer structure, for example two semitransparent layers and a dielectric layer arranged between the two semitransparent layers , exhibit.
  • the functional layer can have a hologram, micromirror and/or optically variable color.
  • the functional layer of the security element layered composite has an embossing lacquer, for example for forming an embossing structure.
  • the embossing lacquer of the security element layered composite can already have an embossing structure.
  • the at least one first luminescent substance can be arranged in the embossing lacquer, with the embossing lacquer on the upper side of the security element layered composite preferably being designed to reflect and/or absorb the emission radiation of the first luminescent substance.
  • plastic layers can be used in order to adjust the thickness of the security element layered composite, to adjust distances between different layers of the security element layered composite, and/or other properties of the security element layered composite influence, such as B. the opacity, the color and / or the deformability of the security element layered composite.
  • plastic layers can comprise an embossing varnish, a protective varnish, a primer, a printed layer and/or further security elements or a combination of the features mentioned here.
  • the security element layer composite can have a scattering layer with light-scattering properties.
  • the intensity of the excitation radiation, which the first luminescent substance experiences, is increased with the aid of the scattering layer.
  • the scattering layer can be designed as a foil with embedded reflective interference particles.
  • the scattering layer can be designed, for example, as a polymer layer with embedded cellulose fibers and/or with high-index inorganic scattering bodies, for example TiO 2 and/or ZrO 2 .
  • the scattering layer is arranged adjacent to the layer in which the first luminescent substance is arranged, for example an adhesive layer or a luminescent substance layer.
  • the first luminescent substance is arranged in the scattering layer and/or the scattering layer is part of the functional layer.
  • the value-document substrate can likewise comprise at least one scattering layer, which is structured and acts similarly to the scattering layer of the security element layered composite, but with regard to the first and possibly second luminescent substance.
  • this plastic layer can be designed as a scattering layer.
  • it preferably contains cellulose fibers and/or fillers, preferably titanium dioxide or carboxymethyl cellulose. This enables a good excitation of the first and/or second luminescent substance, since a high capture cross-section of the luminescent centers of the first and/or second luminescent substance is ensured.
  • a print layer and/or a print acceptance layer of the value document substrate can assume the function of a scattering layer.
  • the document of value can have printing, for example in the form of a printed layer.
  • the printing of the document of value e.g. B. by offset or steel intaglio printing, produces on both sides of the value document substrate a continuous or only locally present (e.g. halftone printing, line screen, barcode, ...) layer of printing inks or pigmented printing varnishes, which is also referred to as the printing ink layer.
  • It typically contains organic or inorganic pigments or organic dyes which absorb strongly in the visible wavelength range and/or in the infrared wavelength range. Although it is very thin relative to the value document substrate, depending on the position of its absorption bands, it can bring about a significant attenuation of the excitation radiation or emission radiation of the first and/or possibly second luminescent substance.
  • the value-document can be constructed in a significantly more complex manner and e.g. B. have a sizing, a protective lacquer layer or other functional layers, or have other security elements such. B. mottled fibers or a watermark.
  • the printing layer, in particular the positioning of the printing pigments and/or the printing lines, and the security element layer composite are adapted to one another.
  • no printing pigments and/or printing ink are arranged in the areas of the document of value in which the security element layered composite is arranged.
  • the printing pigments and/or printing ink at least partially overlap with the security element layered composite.
  • Printing pigments and/or printing ink and/or printing lines are usually provided with dyes in the visual spectrum.
  • printing pigments and/or printing inks which have absorption bands in the infrared range can also be used.
  • absorption in the infrared range can have a positive effect, in particular in the NIR (near infrared) wavelength range.
  • the absorption of the printing pigments and/or the printing ink can be reduced, for example, by halftone printing or similar techniques, whereby not an entire area is printed with printing pigments and/or printing ink, but only a part between the halftone lines or halftone dots remains unprinted.
  • the proportion of unprinted area directly below the security element layered composite on both sides of the value document substrate is preferably more than 30%, particularly preferably more than 50%, further preferably more than 70%. This achieves a compromise between printing and the security element's usability.
  • the absorption spectrum of the printed layer and the emission spectrum of the first luminescent substance are matched to one another. This means that directly below the security element layer composite on both sides of the value document substrate only printed layers are selected whose absorption bands do not correspond to the excitation radiation or the emission radiation match or interact only to a small extent.
  • the excitation and emission radiation of the first luminescent substance are selected in such a way that they each fall into an absorption gap in the printed layer.
  • the printed layer preferably absorbs less than 10% of its maximum absorption in the region of the excitation radiation of the first luminescent substance, particularly preferably less than 5%.
  • the printed layer preferably absorbs less than 10% of its maximum absorption in the region of the emission radiation of the first luminescent substance, particularly preferably less than 5%.
  • the positions of the first and second luminescent substances are matched to one another.
  • the first and second luminescent substances can be arranged in such a way that they do not overlap or overlap in a certain pattern.
  • denomination-specific overlapping areas and/or patterns can be generated.
  • the first and/or second luminescent substance is/are located in an adhesion promoter layer or in the primer of the security element layer composite or the value document substrate. In a further preferred embodiment, the first luminescent substance is located in the adhesive layer.
  • the introduction of the at least one first luminescent substance into the security element layered composite is particularly simple and significantly less error-prone. For example, the introduction and homogeneous dispersion of an inorganic luminescent substance in an adhesive (for example by stirring) is easier than in a plastic layer.
  • the production process could be introduced into the polymer melt of a blown film extrusion be hindered.
  • it can also be verified for quality assurance purposes that the security element layered composite is correctly applied to the value document substrate. This can be done, for example, on an application machine, during final processing and/or during a final inspection.
  • the first luminescent substance can only be arranged in certain areas in the functional layer and/or in the adhesive layer, for example in the form of a pattern.
  • the pattern can be a code, in particular a barcode and/or a 2D code, for example a QR code or a data matrix code. It is thus possible, in addition to the proof of authenticity based on the emission radiation of the first luminescent substance, to also obtain data and/or a further proof of authenticity with regard to the evaluation of the data and/or the pattern from the emission radiation.
  • the first and second luminescent substance can complement one another to form a pattern, so that data can only be obtained or the authenticity of the document of value can be established when the first and second luminescent substance, in particular their coherent patterns, are correlated.
  • the code can contain information about the luminescent substance and/or its properties.
  • the security element layered composite has a pull-off protection.
  • the first luminescent substance is arranged in a layer of the security element layer composite which is suitable for remaining wholly or partially on the value document when the security element layer composite is pulled off or detached from the document of value.
  • This can be, for example, a specially prepared adhesive layer between the security element layered composite and the value document substrate.
  • the document of value still contains the layer with the first luminescent substance of the security element layered composite, but no longer the optically variable effect, preferably no longer the reflecting or absorbing layer, so that the intensity of the detectable emission radiation on the side on which the entire security element layered composite was originally attached was, is now higher, and appears only weaker on the opposite side. It is thus possible to detect that the security element has been pulled off.
  • the value document substrate has a Kubelka-Munk scattering coefficient with a value between 10 and 80 1 mm in a wavelength range from 400 nm to 2100 nm. It was surprisingly found that such valuable document substrates have particularly high transmission properties for emission radiation in a wavelength range from 400 nm to 2100 nm. Furthermore, sufficient transmission of the excitation radiation through the value document substrate is ensured, so that the first luminescent substance receives sufficient excitation. In addition, sufficient transmission of the emission radiation of the security element layer composite through the value document substrate is ensured in order to detect it on the underside of the value document.
  • high scattering of the value-document substrate enables good excitation of the first and/or second luminescent substance, since a high capture cross-section of the luminescent centers of the first and/or second luminescent substance is ensured.
  • the Kubelka-Munk scattering coefficient of 80 1 mm in a wavelength range from 400 nm to 2100 nm an adequate balancing act is created between sufficient transmission and high scattering.
  • the surface area of the document of value comprises the area of the security element layered composite and preferably a surrounding area of the security element layered composite which has an area of at least 100% of the area of the security element layered composite. This ensures that the maximum luminescence intensity can be detected by the security element layered composite.
  • the detected emission, in particular the detected build-up and/or the detected decay behavior, over the surface area is preferably two-dimensional Pattern results, and the pattern corresponds to the type of security element layered composite. This results in increased security against forgery, since the pattern in the luminescence behavior can be related to the visual impression of the security element layered composite.
  • At least two surface areas are selected for detecting the emission, in particular the spectral, decay and/or decay behavior.
  • at least two surface areas can also be exposed to excitation radiation.
  • the respective surface areas can differ in location and size both for detection and for application.
  • any second luminescent substance present is detected at the same time as the first luminescent substance.
  • a plausibility check is preferably carried out using the intensity of the emission radiation of the first and second luminescent substance. This means that if the intensity of the first luminescent substance is reduced compared to the expected value, for example due to the bank note being heavily soiled, the luminescent intensity of the second luminescent substance could also be reduced. Such effects can be taken into account by simultaneously measuring the first and second luminescent substance.
  • the emission radiation is not only detected on the side of the value document that does not bear the security element layered composite, but on both sides of the value document. This results in a more reliable authenticity check.
  • the emission radiation detected on the respective pages of the document of value can be compared with one another.
  • the steps for checking the two sides of the document of value can, if necessary with the same checking unit, take place one after the other, or take place simultaneously, e.g. B. by using an additional detection device on the opposite side of the document of value.
  • the security element layer composite can comprise at least one further luminescent substance, preferably several luminescent substances, in addition to the first luminescent substance, and/or the value document substrate can comprise at least one further luminescent substance, preferably several luminescent substances, in addition to the second luminescent substance.
  • additional luminescent substances of the value document substrate and/or of the security element layer composite can Substances and/or combinations of the luminescent substances described here and/or the same composition as the first or second luminescent substance.
  • the first and possibly second luminescent substance and/or additional luminescent substance can each be designed such that at least one of the luminescent substances excites another of the luminescent substances with its emission radiation, with their excitation wavelength ranges preferably differing at least in certain areas. Thus, the existence of several luminescent substances can be detected with only one excitation radiation.
  • the first and optionally second luminescent substance and/or additional luminescent substance are preferably arranged in different layers and/or at a defined distance from one another in the document of value.
  • the luminescent substances can comprise a combination of at least two of the dopings mentioned here with, for example, rare earth ion and further dopings, the excitation preferably taking place in one doping and the emission taking place in another doping due to an energy transfer.
  • the at least one first and at least one second luminescent substance are preferably in the form of particles.
  • a further aspect relates to a checking unit (referred to in the example as a sensor) for checking the documents of value for authenticity, denomination and/or fitness.
  • the test unit has an excitation device for emitting the excitation radiation for the luminescent substances, and a detection device for detecting the emission radiation of the luminescent substances and an evaluation device for checking the authenticity of the respective value document on the basis of the detected emission radiation.
  • the test unit is designed to carry out a method as described above.
  • a further aspect relates to a non-claimed value document processing device.
  • the value-document processing device comprises an interface for feeding value documents, e.g.
  • the checking unit or value-document processing device is designed to check the value document, the value document being designed as explained above.
  • the verification unit and the document of value, in particular its security element or the security element layer composite are matched to one another in such a way that excitation radiation from the excitation device can excite (first) luminescent substances in the security element layer composite and the detection device is designed to detect emission radiation from the first luminescent substances.
  • the wavelength ranges of the excitation radiation and/or emission radiation can be adapted to the system of value document and test unit or value document processing device, since other luminescent substances can be used depending on the type of value document.
  • the positions of the excitation device and the detection device on the checking unit can be adapted to the types of documents of value that are to be checked with the checking unit.
  • This method enables a particularly high degree of security against forgery, since the luminescent substance is also checked in those areas in which its emission does not emerge at the top of the document of value.
  • damaged documents of value and/or counterfeit documents of value can be determined on the basis of disturbances in the intensity values and/or their areal distribution on the top and/or bottom.
  • the presence of the security features, in particular the areas relating to the optically variable effect, is possible.
  • the security element can be an imprint, for example made of an ink with optically variable pigments, a thread, a stripe, a patch, one or more coatings and/or another security element that has an optically variable effect as already may include described.
  • the method can be expanded to include the steps already explained for the previous method according to the invention, for example checking two sides of the value document and evaluating them.
  • the method is carried out by a checking unit or value-document processing device.
  • the Figures 1a and 1b 12 each show schematically an embodiment of a security transfer element according to the invention.
  • a security transfer element 20 is shown in the form of a security strip.
  • the security transfer element 20 comprises a carrier film 21 made of PET, for example.
  • a security element layer composite 200 is detachably arranged on the carrier film 21 .
  • the security element layered composite 200 comprises a functional layer 210 and an adhesive layer 220.
  • the functional layer 210 has an embossing lacquer 211 with an embossing structure 212, the side of the embossing lacquer 211 which is not provided with the embossing structure 212 facing the carrier film 21.
  • the embossing lacquer 211 is coated on the side of the embossing structure 212 with a metallization 213, for example an aluminum layer.
  • the metallization 213 adapts to the shape of the embossing varnish 211 and thus to the embossing structure 212 .
  • the adhesive layer 220 is also arranged on the metallization 213 .
  • the adhesive layer 220 includes a plurality of first luminescent substances.
  • the security transfer element 20 also has a carrier film 21 which is detachably connected to a security element layered composite 200 .
  • the security element layered composite 200 comprises an embossing lacquer 211 with an embossing structure 212, a metallization 213 which is arranged on the side of the embossing lacquer 211 which is opposite the carrier film 21, and a luminescent substance layer 214 in which the first luminescent substances are arranged.
  • An adhesive layer 220 is arranged on the luminescent substance layer 214 .
  • the security transfer element 20 of Figures 1a and 1b can be placed on a value document substrate (cf. Fig. 2 ad ) are applied. That's what it's gonna be Security transfer element 20 placed on the value document substrate and connected by activating the adhesive layer 220 with the value document substrate.
  • the carrier film 21 which is detachably connected to the security element layered composite 200 is then removed. Only the layered security element composite 200 remains on the value document substrate.
  • the layered security element composite 200 is then arranged on the document of value in such a way that a viewer can perceive the embossed structure 212 in incident light on the layered security element composite 200 (top side) in such a way that he can perceive an optically variable effect when changing the viewing angle can.
  • the metallization 213 serves as a reflector.
  • the first luminescent substances of the luminescent substance layer 214 or the adhesive layer 220 are excited, their emission radiation is reflected by the metallization 213 in a direction which is not directed towards the top side of the document of value, but towards the substrate. Emission radiation from the first luminescent substances can only be detected from the underside of the document of value.
  • embossing varnish 211, the metallization 213 and/or the luminescence substance layer 214 do not have to extend over the entire security transfer element 20. Rather, it is also conceivable that each of the layers is applied only in certain areas. In the examples of Figures 1a and 1b the functional layer 200 has a recess.
  • a value document 30 has a value document substrate 300 .
  • the value-document substrate 300 comprises a value-document substrate layer 320, which is printed with a printing layer 330, which is a printing ink layer 330 in the present example.
  • a layered composite security element 200 is arranged on top of the document-of-value substrate 300, namely on the ink layer 330.
  • the layered security-element composite 200 is thus separated from the document-of-value substrate 300 by the ink layer 330.
  • the side of the value document substrate 300 on which the security element layered composite 200 faces an observer is the top side of the value document 30.
  • the security element layered composite 200 is formed, for example, as shown in FIGS. 1a or 1b.
  • the security element layered composite 200 comprises a functional layer and first luminescent substances.
  • the functional layer is designed in such a way that emission radiation from the first luminescent substances does not exit at the top of the document of value 30 . Rather, the emission radiation of excited first luminescent substances penetrates through the printing ink layer 330 and the value-document substrate layer 320 and emerges from the underside of the value document 30 .
  • an excitation radiation In order to detect the luminescent substances of the security element layer composite 200, ie the first luminescent substances, an excitation radiation must first traverse the value document substrate 300. The emission radiation of the excited first luminescent substances must then likewise traverse the value-document substrate 300 in the opposite direction. As a result, the luminescence can be significantly weakened, inter alia, by scattering in the value-document substrate 300 and absorption by the printing ink layer 330 .
  • a document of value 30 according to the invention is shown.
  • the value document Figure 2b differs from the value document 30 of Figure 2a in that the ink layer 330 is not merely applied to the value document substrate layer 320.
  • the printing ink layer 330 is not part of the value document substrate 300.
  • the security element layered composite 200 is arranged directly on the value document substrate 300. After the arrangement of the security element layer 200 on the value document substrate 300, the printing layer 330 is applied to the value document substrate 300 and the security element layer composite 200 and thus also covers the security element layer composite 200, but not the connecting surface between security element layer composite 200 and value document substrate 300.
  • a color layer and/or lacquer layer and/or foil can be arranged.
  • the excitation radiation from the first luminescent substances in the security element layer composite 200 therefore only has to penetrate the value-document substrate 300 in order to excite the first luminescent substances, and not the printing layer 330. Furthermore, emission radiation from the first luminescent substances only has to penetrate the value-document substrate 300 in order to be detected by a detector on the underside of the value document 30 to be detected, and not the print layer 330.
  • the security element layered composite 200 can, as in FIGS Figures 1a and 1b shown, be executed. However, an emission radiation from the first luminescent substances does not penetrate the security element layered composite 200 in such a way that the emission radiation emerges from the upper side of the document of value 30 and can be detected.
  • the Figure 2c shows a value document that is similar to the value document Figure 2b is.
  • the printing layer 330 on the upper side of the value document substrate 300 in the area of the security element layered composite 200 has a gap.
  • a printed layer 330 is also arranged on the underside of the value-document substrate 300, which partially overlaps with the security-element layered composite 200 in transmitted light. Emission radiation and excitation radiation of the first luminescent substances must therefore penetrate the printed layer 330 and the value-document substrate layer 320 in some areas.
  • the printed layer 330 can accordingly weaken the excitation and emission of the first luminescent substances.
  • the Figure 2d shows a document of value similar to that from Figure 2c is.
  • the value-document substrate 300 is thinned out, so that after the security element layered composite 200 has been applied, the maximum thickness of the value-document 30 does not increase too much.
  • the thinning can essentially correspond to the thickness of the security element layered composite 200 .
  • the area of the underside of the document of value which overlaps with the security element layered composite 200 in transmitted light was not printed.
  • the excitation and emission radiation of the first luminescent substances only has to traverse the thin value document substrate 300 and no printed layer 330, so that the highest luminescence intensity can be achieved in this case.
  • the first luminescent substance is located, preferably in one or more polymer layers below a reflective layer. Due to the strong absorption or reflection of the reflecting layer, on the one hand, the security element layer composite can be read out 200 from the top of the value document 30 prevented. On the other hand, an increase in intensity of the first luminescent substances can be generated by the reflection of the excitation and emission radiation on its underside, since z. B. scattered excitation radiation can hit the first luminescent substances several times.
  • the Figures 3a and 3b show schematic representations of a test method of a document of value according to the invention.
  • the examination of a value document 30 is shown, which comprises a security element layered composite 200 arranged on a value document substrate 300 .
  • the security element layered composite 200 has an embossing lacquer layer 211 on which a reflective metallization 213 is applied.
  • a luminescent substance layer 214 with first luminescent substances 240 is arranged under the embossing lacquer layer 211 .
  • the value-document substrate 300 comprises a value-document substrate layer 320 on which a printing layer 330 is applied on both sides.
  • the detection of the luminescence of the security element layer composite 200 or of the first luminescent substances 240 contained in the security element layer composite 200 does not take place from the upper side of the document of value 30, but from its underside.
  • An excitation radiation 410 from a sensor 50 passes through the printed layer 330, the value document substrate layer 320, another printed layer 330, a part of the security element layer composite 200 and reaches the luminescent substance layer 214, which contains the first luminescent substances 240 and excites them. Furthermore, the excitation radiation 410 passes another part of the security element layered assembly 200, reaches the metallization 213 and is reflected back there (or scattered), so that the excitation radiation 410 cannot penetrate the security element layered composite 200 and exit at the top.
  • the emission radiation 430 of the first luminescent substances 240 is generally emitted in an undirected manner in all spatial directions.
  • the luminescence substances 240 excited to luminescence therefore send back part of the emission radiation 430 directly (it therefore passes the same path as the excitation radiation 410).
  • a significantly larger part only reaches the sensor 50 after several scattering or reflection processes.
  • another part of the emission radiation 430 reaches the metallization 214 and is reflected (or scattered) on it and can thus also contribute to the detected emission radiation 430, which is present on the side of the value document 30 that does not bear the security element layer composite 200, here on the lower printing layer 330. exit.
  • the emission radiation 430 reaches sensor 50, which detects it.
  • the Figure 3b shows the same value document 30 as in FIG Figure 3a , but here the measurement is carried out from the other side of the document of value 30.
  • the excitation radiation 410 cannot penetrate the metallization 214, so the luminescent substances 240 are not excited and do not emit any emission radiation.
  • the excitation radiation 410 passes through the metallization 214, e.g. because this is not completely reflective, and the luminescent substances 240 are thus partially excited.
  • the resulting emission radiation would have to penetrate the metallization 214 again, so that it is once again greatly weakened.
  • the emission radiation detectable by the sensor 50 would therefore be very low.

Claims (16)

  1. Elément de transfert de sécurité (20) pour un document de valeur (30), comprenant un composite de couches d'élément de sécurité (200) et un film support (21) joint de manière détachable au composite de couches d'élément de sécurité (200), cependant que le composite de couches d'élément de sécurité
    - comporte une couche fonctionnelle (210) qui, après le transfert sur un document de valeur (30), déploie pour un observateur un effet optiquement variable ;
    - comporte une couche de colle (220) ;
    - comporte une face de dessus qui, après un transfert du composite de couches d'élément de sécurité (200) sur un substrat pour document de valeur (300), est tournée vers l'observateur, cependant que la couche de colle (220) est agencée sur la face de la couche fonctionnelle (210) opposée à la face de dessus ; et
    - comporte au moins une substance luminescente, cependant que la substance luminescente est agencée dans la couche de colle (220) et/ou dans une couche de substance luminescente (214), cependant que la couche de colle (220) et/ou la couche de substance luminescente (214) est agencée dans le composite de couches d'élément de sécurité (200) sur la face de la couche fonctionnelle (210) opposée à la face de dessus ; cependant que
    la couche fonctionnelle est réalisée sous forme opaque pour un rayonnement primaire d'émission (430) de la substance luminescente,
    caractérisé en ce que
    la substance luminescente a le rayonnement primaire d'émission dans la plage de longueur d'ondes comprise entre 700 nm et 2100 nm et est excitable par un rayonnement d'excitation (410) de la plage de longueur d'ondes comprise entre 400 nm et 2100 nm, en particulier entre 700 nm et 2100 nm, cependant que le rayonnement d'émission (430) de la substance luminescente du composite de couches d'élément de sécurité (200) se situe dans une plage de longueur d'ondes comprise entre 900 nm et 1300 nm, et/ou entre 1300 nm et 1600 nm, et/ou entre 1600 nm et 1850 nm, et/ou entre 1850 nm et 2100 nm.
  2. Elément de transfert de sécurité (20) selon la revendication précédente, caractérisé en ce que la substance luminescente du composite de couches d'élément de sécurité (200) ne présente aucune émission supplémentaire anti-Stokes visuellement reconnaissable par un être humain.
  3. Elément de transfert de sécurité (20) selon une des revendications précédentes, caractérisé en ce que la substance luminescente du composite de couches d'élément de sécurité (200) comprend des colorants organiques, des complexes organométalliques avec en particulier erbium, thulium, holmium, néodyme ou ytterbium, et/ou des pigments inorganiques dopés avec les dopants erbium, thulium, holmium, néodyme ou ytterbium ou dopés avec des métaux de transition, particulièrement de préférence chrome, manganèse et/ou fer.
  4. Elément de transfert de sécurité (20) selon une des revendications précédentes, caractérisé en ce que la au moins une substance luminescente présente une taille de grain (D99) inférieure à 15 µm, de préférence inférieure à 8 µm, et en outre de préférence inférieure à 5 µm.
  5. Elément de transfert de sécurité (20) selon une des revendications précédentes, caractérisé en ce que la couche fonctionnelle (210) est réalisée sous forme absorbante et/ou réfléchissante.
  6. Elément de transfert de sécurité (20) selon une des revendications précédentes, caractérisé en ce que la couche fonctionnelle (210) comprend au moins par zones , de préférence à pleine surface, une couche métallique et/ou un revêtement métallique, cependant que, de préférence, la couche métallique et/ou le revêtement métallique est réalisé(e) sur la face de la couche fonctionnelle (210) tournée à l'opposé de l'observateur., ou est réalisée sur la face de la couche fonctionnelle (210) tournée vers l'observateur.
  7. Elément de transfert de sécurité (20) selon une des revendications précédentes, caractérisé en ce que la couche fonctionnelle (210) déployant l'effet optiquement variable comprend une structure gaufrée réfléchissante (212), en particulier une structure diffractive et/ou une microstructure réfléchissante, et/ou comporte des couches transparentes à indice de réfraction élevé, des éléments en couche mince à effet de basculement des couleurs, en particulier avec une couche réfléchissante et une couche semi-transparente ainsi qu'une couche diélectrique agencée entre ces dernières, des couches en matériau cristaux liquides, en particulier en matériau cristaux liquides cholestérique, des couches imprimées sur la base de compositions de pigments à effets ayant un effet dépendant de l'angle d'observation ou ayant différentes couleurs, et/ou présente un empilement de couches, à savoir deux couches semi-transparentes et une couche diélectrique agencée entre les deux couches semi-transparentes.
  8. Elément de transfert de sécurité (20) selon une des revendications précédentes, caractérisé en ce que le composite de couches d'élément de sécurité (200) comporte une couche de diffusion ayant des propriétés de diffusion de lumière, cependant que, de préférence, la couche de diffusion est agencée de manière adjacente à la substance luminescente et/ou de manière adjacente à la couche de substance luminescente (214) ; et/ou fait partie de la couche fonctionnelle (210).
  9. Document de valeur (30) comprenant un substrat plan pour document de valeur (300) et un composite de couches d'élément de sécurité (200), cependant que le composite de couches d'élément de sécurité (200)
    o comporte une couche fonctionnelle qui, lors d'une observation en lumière incidente, déploie sur une face de dessus de la couche fonctionnelle (210) pour un observateur un effet optiquement variable ;
    o comporte une couche de colle (220) ;
    o comporte une face de dessus qui, après un transfert du composite de couches d'élément de sécurité (200) sur le substrat pour document de valeur, est tournée vers l'observateur, cependant que la couche de colle est agencée sur la face de la couche fonctionnelle (210) opposée à la face de dessus ; et
    o comporte au moins une première substance luminescente (240), cependant que la première substance luminescente (240) est agencée dans la couche de colle (220) et/ou dans une couche de substance luminescente (214) agencée dans le composite de couches d'élément de sécurité (200) sur la face de la couche fonctionnelle (210) opposée à la face de dessus ; et
    - le composite de couches d'élément de sécurité (200) est agencé de telle façon sur une face de dessus du substrat pour document de valeur (300) que la couche fonctionnelle (210) déployant l'effet optiquement variable est orientée de telle façon que l'effet optiquement variable est reconnaissable en lumière incidente sur une face de dessus du document de valeur (30), et le composite de couches d'élément de sécurité (200), en lumière incidente sur une face de dessous du document de valeur (30) opposée à la face de dessus du document de valeur, est au moins recouvert par zones par le substrat pour document de valeur (300) ; cependant que
    la couche fonctionnelle (210) est réalisée sous forme opaque pour un rayonnement primaire d'émission (430) de la substance luminescente,
    caractérisé en ce que
    la au moins une première substance luminescente (240) a le rayonnement primaire d'émission (430) dans la plage de longueur d'ondes comprise entre 700 nm et 2100 nm et est excitable par un rayonnement d'excitation (410) de la plage de longueur d'ondes comprise entre 400 nm et 2100 nm, en particulier entre 700 nm et 2100 nm, cependant que le rayonnement d'émission (430) de la première substance luminescente (240) du composite de couches d'élément de sécurité (200) se situe dans une plage de longueur d'ondes comprise entre 900 nm et 1300 nm, et/ou entre 1300 nm et 1600 nm, et/ou entre 1600 nm et 1850 nm, et/ou entre 1850 nm et 2100 nm.
  10. Document de valeur (30) selon la revendication 9, caractérisé en ce que l'intensité du rayonnement d'émission (430) de la au moins une première substance luminescente (240) du composite de couches d'élément de sécurité (200) est nettement plus élevée à la face de dessous qu'à la face de dessus du document de valeur (30), cependant que, de préférence, nul rayonnement d'émission (430) de la première substance luminescente (240) ne s'échappe à la face de dessus.
  11. Document de valeur (30) selon la revendication 9 ou 10, caractérisé en ce que le substrat pour document de valeur (300) comprend au moins une pellicule d'une couche de substrat de papier, cependant que la couche de substrat de papier comprend des fibres de cellulose et/ou des matières de remplissage, cependant que les matières de remplissage sont de préférence dioxyde de titane, auxiliaires organiques, de préférence carboxyméthylcellulose, et/ou comprend au moins une couche de matière synthétique, de préférence une couche polymère avec de préférence fibres de cellulose et/ou matières de remplissage, de préférence dioxyde de titane ou carboxyméthylcellulose, et/ou le substrat pour document de valeur (300) présente un coefficient de diffusion Kubelka-Munk d'une valeur comprise entre 10 et 80 1 mm
    Figure imgb0006
     dans une plage de longueur d'ondes comprise entre 400 nm et 2100 nm.
  12. Document de valeur (30) selon une des revendications de 9 à 11, caractérisé en ce que le substrat pour document de valeur (300) comprend au moins une deuxième substance luminescente, cependant que la plage de longueur d'ondes d'émission du rayonnement d'émission (430) et/ou la plage de longueur d'ondes d'excitation de la deuxième substance luminescente correspond essentiellement à la plage de longueur d'ondes du rayonnement d'émission (430) et/ou de l'excitation de la première substance luminescente du composite de couches d'élément de sécurité (200), cependant que la première substance luminescente du composite de couches d'élément de sécurité (200) et la deuxième substance luminescente du substrat pour document de valeur (300) présentent en particulier un comportement luminescent complémentaire l'une envers l'autre.
  13. Document de valeur (30) selon une des revendications de 9 à 12, caractérisé en ce que la première substance luminescente présente un indice de réfraction qui est adapté à l'indice de réfraction du matériau entourant la première substance luminescente, cependant que, de préférence, l'indice de réfraction de la première substance luminescente (240) est égal à l'indice de réfraction du matériau entourant la première substance luminescente (240).
  14. Procédé de vérification d'un document de valeur (30) selon une des revendications de 9 à 13, comprenant les étapes suivantes :
    - exposition du document de valeur (30) à un rayonnement d'excitation (410) en lumière incidente à la face de dessous du document de valeur (30),
    cependant que le rayonnement d'excitation comprend la plage de longueur d'ondes d'excitation de la première substance luminescente (240) du composite de couches d'élément de sécurité (200) ;
    - détection d'une émission, en particulier d'un comportement de croissance et/ou de décroissance du rayonnement d'émission (430), de la première substance luminescente (240) du composite de couches d'élément de sécurité (200) à la face de dessous du document de valeur (30) sur au moins une zone de surface du document de valeur (30) ; et
    - détermination de l'authenticité du composite de couches d'élément de sécurité (200) à partir de l'émission détectée, en particulier à partir du comportement de croissance et/ou de décroissance du rayonnement d'émission (430) détecté.
  15. Procédé selon la revendication 14, caractérisé en ce que la zone de surface du document de valeur (30) comprend la zone du composite de couches d'élément de sécurité (200) et de préférence une zone environnante, du composite de couches d'élément de sécurité (200), ayant une surface d'au moins 100 % la surface du composite de couches d'élément de sécurité (200).
  16. Procédé selon la revendication 14 ou 15, caractérisé par les étapes suivantes :
    - exposition du document de valeur (30) à un rayonnement d'excitation (410) en lumière incidente à la face de dessus du document de valeur (30),
    cependant que le rayonnement d'excitation (410) comprend la plage de longueur d'ondes d'excitation de la première substance luminescente du composite de couches d'élément de sécurité (200) ;
    - détection d'une émission, en particulier d'un comportement de croissance et/ou de décroissance du rayonnement d'émission (430), de la première substance luminescente du composite de couches d'élément de sécurité (200) à la face de dessus du document de valeur (30) sur au moins une zone de surface du document de valeur (30) ; et
    - comparaison de l'émission détectée à la face de dessus du document de valeur (30) avec l'émission détectée à la face de dessous du document de valeur (30), pour la vérification de l'authenticité du document de valeur (30).
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DE102020007088A1 (de) 2020-11-19 2022-05-19 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement eines Sicherheitsdokuments mit Motivelement auf Markierungsschicht und Verfahren zum Erzeugen eines Sicherheitselements
DE102020131382A1 (de) 2020-11-26 2022-06-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Methode zur Kennzeichnung von Produkten mit optischem Sicherheitsmerkmal mit zeitlicher Dimension
DE102021003697A1 (de) 2021-07-16 2023-01-19 Giesecke+Devrient Currency Technology Gmbh Banknote mit einem Banknotensubstrat und einem Sicherheitselement, sowie Verfahren zum Prüfen einer Banknote

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