Security element for a value document, having a luminescent security feature, and method for production thereof

Abstract

A security element for a value document comprises: a first concealed motif region having a first luminescence layer with at least one first excitation wavelength in the UV-A range; and a second concealed motif region having a second luminescence layer with at least one second excitation wavelength in the UV-A range that is different from the at least one first excitation wavelength.

Description

[0001] Security element for a value document with a luminescent security feature and method for its production The invention relates to a security element for a value document with a luminescent security feature comprising a first luminescent layer of a first hidden motif area and a second luminescent layer of a second hidden motif area and a method for its production. Optically variable surface patterns, which are sufficiently known in the prior art, are often used to produce security features. Security features and / or security elements with security features are often used which realize movement effects, for example by means of microreflectors. In the prior art, for example, security elements are known in which colors are generated with the aid of nanostructures with structural sizes in the sub-wavelength range.A combination of micromirrors with nanostructures located thereon can produce colorful rolling and / or 3D effects (the "rolling bar" effect using microreflectors is shown in DE 10 2010 047 250 A1 and a 3D effect is shown in DE 10 2009 056 934 A1). The micromirrors essentially generate the rolling and / or 3D effect, and the nanostructures color them or can optionally also produce multi-colored effects. To improve protection against counterfeiting, security features and / or security elements sometimes have so-called Class 2 features, which can be read using tools such as a UV lamp. A Class 2 feature is typically understood to be a security feature that can be authenticated using tools such as a UV lamp. It is an object of the present invention to provide a security element with alternative properties and effects.It is a further object of the present invention to provide a security element with alternative Class 2 features. It is a further object of the present invention to provide a security element with a high level of forgery security. Another object is to make the non-destructive removal of the security element from an object and / or a substrate more difficult or even impossible. A further object is that the effect of the security element, which can be recognized with the aid of aids, appears particularly striking and / or aesthetic to the observer. It is a further object of the present invention to provide a security element which is not perceived as an intrusive element and which makes an object to be secured thereby appear more aesthetically pleasing. Furthermore, a task is to provide a corresponding method for producing a security element.Another object is to provide a security element with Class 2 features that are safe and easy for a user to read. At least one of these objects is achieved by the respective subject matter of the independent claims. According to one aspect, a security element for a value document with a luminescent security feature comprises: a first hidden motif area having a first luminescent layer with at least one first excitation wavelength in the UV-A range; and a second hidden motif area having a second luminescent layer with at least one second excitation wavelength in the UV-A range that differs from the at least one first excitation wavelength. The security element has additional and / or alternative properties and effects with respect to the already known security elements.The security element has, in particular, an additional and / or alternative Class 2 feature with respect to the security elements already known. The security element has a high level of forgery security with respect to the security elements already known. With the aid of aids, the detectable effect of the security element appears particularly striking to the observer. Furthermore, the security element is not perceived as an intrusive element on a valuable document, a product and / or a substrate and makes the object to be secured with it appear aesthetically pleasing. The security element can comprise or represent a strip, a patch and / or a thread. The valuable document can, for example, be a banknote or a valuable document for verifying a product value. A security feature comprises the feature with which a security element is provided, by means of which verification can be carried out.The security feature of the luminescent security element is a Class 2 feature because it is not visible to the naked eye. The first hidden motif area, which has the first luminescent layer, and the second hidden motif area, which has the second luminescent layer, can together form one or more luminescent security features. The UV-A range lies in a wavelength range between approximately 315 nm and approximately 405 nm. The UV-A range includes the typical wavelengths of so-called black light. Since the excitation wavelengths are all in the UV-A range, the security element can be read safely and easily by a user. For example, a simple commercially available black light fluorescent lamp may be sufficient in some cases to read the hidden motif areas.Compared to shorter-wave UV rays, the UV-A range is comparatively harmless for the user, and harmful radiation can, if necessary, be shielded, for example, by an absorbing material such as plastic (plastic eyeglass lenses). Both excitation wavelengths are preferably in the range between 350 and 400 nm. A UV lamp with switchable excitation radiation, in particular switchable between excitation wavelengths, is preferably used to test the security element. The UV lamp switches, for example, between two or three of the following three excitation modes: with the first excitation wavelength, with the second excitation wavelength, or with both excitation wavelengths. During production of the security element, it may be possible to use the same lamp to cure an optional UV-curing adhesive as for reading the hidden luminescence regions.The first luminescent layer and / or the second luminescent layer can be excited by irradiation with light of a discrete wavelength or with light of a continuous spectrum, each in the UV-A range. Two exemplary discrete wavelengths are 395 nm and 365 nm. The first luminescent layer and / or the second luminescent layer can each have a single excitation wavelength (or excitation frequency) or multiple excitation wavelengths. A single UV lamp, which, for example, has a continuous wavelength spectrum, can therefore be (only) suitable for exciting the two different excitation wavelengths of the first and second luminescent layers. The first luminescent layer and the second luminescent layer can have not only different excitation wavelengths, but also different emission wavelengths. The emission wavelengths can be in the visible or invisible wavelength range.If the emission wavelengths are in the visible range, a multicolored, colorful image is created for the viewer. If an emission wavelength is in the invisible range (in the UV range), the information can be read by a device. In this case, it is referred to as a machine-readable security feature. Providing two or more luminescent layers therefore has the effect of making verification more secure, since at least two excitation wavelengths in the UV-A range are required or can be used selectively for readout. On the other hand, the aesthetic perception of the security feature can be increased, since light of several wavelengths or emission wavelengths is emitted, thus creating a multicolored, colorful image for the viewer upon luminescence excitation.The emission wavelengths can therefore differ such that light of different colors is emitted in at least two different hidden motif areas. Two different excitation wavelengths and / or two different emission wavelengths represent two wavelengths that differ from each other by at least 5 nm, preferably by at least 10 nm, and particularly preferably by at least 20 nm of their central and / or discrete wavelengths. The first luminescent layer and / or the second luminescent layer can be at least partially transparent, in particular in the visible wavelength range. However, at least one luminescent layer can be transparent such that light with one excitation wavelength reaches a sufficient penetration depth to cause luminescent excitation or luminescence excitation in the luminescent layer, and emission light can subsequently emerge from the luminescent layer.The term "hidden motif area" refers to an area on the security element that is not identifiable without aids, such as a UV lamp, for example, and that contains a motif, an area, and / or a pattern hidden therein, which is therefore only visible and / or identifiable and / or readable using said aid. The security element can further comprise at least one transparency area and / or a perforation area, wherein the first hidden motif area and / or the second hidden motif area is arranged in the transparency area and / or the perforation area of ​​the security element. The first luminescent layer and the second luminescent layer are thus at least partially located in the transparency area and / or the perforation area.The transparency region allows the light with the excitation wavelength to reach the luminescent layer, which may be covered with an at least partially transparent layer, from a single side or even from both sides of the security element. In addition, the transparency region allows the light with the emission wavelength to leave the respective luminescent layer on one or both sides of the security element and to exit the security element. In the transparency region, the respective luminescent layers are not covered, at least on one side, by an opaque (non-transparent) layer, such as a metal foil or a metal layer. In a sandwich structure, a bottom film can be an opaque and / or an at least partially transparent film. Various functional layers can be arranged above these, above which the first and second luminescent layers are arranged.One or more exclusively transparent layers can be arranged over the luminescent layers, or an opaque layer, such as a metal layer, can be arranged partially over at least one of the luminescent layers. In any case, the transparency region allows light to reach the respective luminescent layers from at least one side of the security element (from "above" and / or "below") in order to achieve luminescence excitation, and accordingly, the emission light can also be emitted outwardly from the respective luminescent layer on at least one side. In other words, a transparency region is a region on the security element that is transparent to luminescence excitation with UV light and luminescence emission, at least with respect to an exit surface. The luminescent layers are therefore not completely covered by an opaque layer, at least in the direction of an exit surface (towards and / or below).In a perforation region, an opaque layer, in particular a metal layer, is present but provided with perforating elements. The excitation light and / or the emission light can only pass through the perforating elements in the metal layer. Otherwise, the same assumptions apply as in a transparent region. A transparent region and / or the perforation region is a region whose shape is recognizable. In these regions, the luminescent layers are not covered by an opaque layer or are not completely covered by the perforating elements. The first luminescent layer can at least partially overlap with the second luminescent layer, specifically in an overlap region. The first luminescent layer and / or the second luminescent layer and / or a further luminescent layer will completely or partially overlap with the transparent region(s) and / or with the perforation region(s).In a sandwich structure, one of the at least two luminescent layers optionally lies at least partially over the other luminescent layer. In the overlapping area or overlapping region, light of two different emission wavelengths can therefore be emitted. Furthermore, a hidden motif area can lie over another hidden motif area, whereby the motifs of the motif areas become individually visible when they are irradiated one after the other with the respective excitation wavelength, i.e. when only the first and then the second luminescent layer is excited. If both motif areas are irradiated simultaneously with light of the respective excitation wavelengths, an overlay of the motifs of both motif areas and / or a mixed color effect of several emission wavelengths can result. The security element can further comprise at least one at least partially opaque area.The opaque region is at least partially opaque to visible and / or UV light. The opaque region can be arranged at least partially above (with its layer directly or indirectly on) the first luminescent layer and / or the second luminescent layer. The opaque region can additionally or alternatively be arranged at least partially laterally next to the first luminescent layer and / or the second luminescent layer. The opaque region can have one or more colors, wherein the colors are matched to an emission color, in particular chosen to be the same as or to contrast well with an emission color of the luminescent layer. An opaque region can comprise a lacquer layer, in particular a colored lacquer layer. For example, in the case of a filter, an opaque region can be opaque for one wavelength range and transparent for another wavelength range.Therefore, under such circumstances, an at least partially opaque area may also represent an at least partially transparent area. The first hidden motif area and / or the second hidden motif area may each be smaller in area than the respective associated first luminescent layer and / or second luminescent layer, since the motif areas can only correspond to the areas that are visible to the viewer upon luminescence excitation and the first luminescent layer and / or the second luminescent layer may be partially obscured from view by the opaque area. The opaque area may contain information, motifs and / or shapes that become visible on the security element in incident light and / or transmitted light. The opaque area may, for example, also correspond to a printed area.The opaque region and / or the perforation region can comprise a metal layer, wherein the metal layer can preferably comprise a relief structure that can represent and / or form an optically variable surface pattern. The security element with the optically variable surface pattern, the first luminescent layer and the second luminescent layer has additional and / or alternative properties and effects with respect to the already known security elements. With respect to the already known security elements, the security element has, in particular, additional and / or alternative Class 2 features. With respect to the already known security elements, the security element has a high level of protection against forgery. With the aid of aids, the discernible effects of the security element appear particularly striking and / or aesthetic to the observer.Furthermore, the security element is not perceived as an obtrusive element on a valuable document, a product, and / or a substrate, and makes the object being secured appear more aesthetically pleasing. The metal layer represents an opaque layer that is opaque, i.e., impermeable, to light, and in particular to emitted light and light that stimulates luminescence (also known as "luminescence excitation"). The optically variable surface pattern is referred to herein as an optically variable primary surface pattern because it primarily exhibits a visible effect when exposed to visible light, before a luminescent layer is stimulated. The optically variable primary surface pattern can depict, generate, and / or display a motif with optically variable properties. The motif can comprise an image of a real object, symbols, ornaments, fantasy elements, and / or other motifs.The optically variable primary surface pattern can be visible to a viewer in the opaque area(s) and / or in the perforation area(s) in reflected light. For example, daylight that is or will be irradiated from the side of the security element on which the viewer is located can serve for this purpose. The optically variable primary surface pattern can be or become visible to the viewer in particular when exposed to visible light. The optically variable primary surface pattern described herein can be formed by at least one motif layer with a relief structure, such as a microstructure, a nanostructure and / or a sub-wavelength structure. The at least one motif layer can comprise a metal layer and preferably an embossed layer, above and / or below which the metal layer is arranged. The perforation of the metal layer by means of the perforating elements can represent an element pattern.In the region of the element pattern, at least one of the two luminescent layers according to the invention can be arranged above and / or below the primary surface pattern. At least one of the at least two luminescent layers can be at least partially transparent. The term "optically variable" generally means that different impressions become visible or recognizable to the viewer depending on a viewing angle (including tilting / rotating), a side of the security feature (front / back), a reflection (top view) and / or a transmission (view through, i.e. against the light source), whereby an optically variable security feature can have a color effect, a moving motif, a floating motif and / or a running effect. The security element is particularly preferably optically variable depending on the viewing angle.The relief structure, in particular the microstructure, the nanostructure and / or the sub-wavelength structure can comprise an optically variable micro- and / or nanorelief, preferably with dimensions in and / or below the visible wavelength range, in particular holograms, micromirrors, microlenses and / or corresponding or other nanostructures. The security element can have a front and a back. The front is the side facing the viewer when they view the security element according to its actual purpose. The back is therefore the side facing away from the viewer, which can be provided, for example, with an adhesive, for example an adhesive, in order to arrange and / or fix the security element on a value document or a product.The first luminescent layer and the second luminescent layer can lie at least partially in a common plane or in a common plane region. This means that the first luminescent layer and the second luminescent layer are arranged in a sandwich structure on or below a layer at least partially in a common plane above or below. The layer above or below can also have a roughness such that the first and second luminescent layers cannot be arranged in a flat plane above or below. Therefore, it can also be a plane region in which the luminescent layers can be arranged within the framework of the roughness.The effect perceptible to the observer is that when both luminescent layers are excited by luminescence, only the first luminescent layer can be visible when viewed from above in a first surface area, and only the second luminescent layer can be visible in a second surface area. In addition, these luminescent layers can overlap in some areas, so that in a third area, an overlap area, when both luminescent layers are excited by luminescence, both luminescent layers can become visible simultaneously. If, on the other hand, only one of the two luminescent layers is excited, then accordingly only the first or only the second luminescent layer becomes visible in the overlap area. The arrangement of several luminescent layers on top of and / or next to one another can create special effects which, when excited by luminescence together, can correspond to a multi-colored image of a hidden motif.This leads to increased security during verification by the security element. Furthermore, the security element appears particularly aesthetically pleasing to the observer. It is also possible that an overlapping concealing and / or obscuring luminescent layer is arranged over the other luminescent layer(s), so that the hidden motif(s) will be difficult or impossible to detect upon luminescence excitation of all luminescent layers, since the overlapping concealing luminescent layer will "outshine" the other luminescent layers. Therefore, especially when an overlapping concealing luminescent layer is arranged, it may be necessary for verification that the wavelength range for the luminescence excitation in the UV-A range is known in order to make the predetermined hidden motif(s) visible.In this case, for example, a wavelength or a wavelength range of the luminescence excitation must be left out for the concealing luminescent layer in order to make the motif or motifs visible. This leads to further increased security during verification by the security element. In principle, two or more luminescent layers can also be arranged in different levels and / or on or under different layers of a sandwich structure, for example, to create different effects. The first concealed motif area and / or the second concealed motif area can comprise at least one element and / or grid perforated into the metal layer. An element perforated into the metal layer can also be understood as an element perforating the metal layer (in short: perforating element).In other words, in addition to the first luminescent layer and the second luminescent layer, the security element has a perforated metal layer with holes or perforations, which can have a shape and through which the first and / or the second luminescent layer becomes visible upon appropriate luminescence excitation, and therefore an emission light in the shape of the perforations is emitted. The emission light, which images the shape of the perforations, can form a hidden secondary surface pattern, which becomes secondarily visible, i.e. not upon irradiation with white light, but upon irradiation with light of a wavelength in the UV-A range. The hidden secondary surface pattern can correspond to a first and / or second motif of the respective first hidden motif area and / or the second hidden motif area. The perforated metal layer preferably has the aforementioned optically variable primary surface pattern.White light irradiated from the side of the security element facing the viewer can then be scattered, reflected and / or diffracted by the perforated metal layer with the optically variable primary surface pattern such that an optically variable motif appears that is dependent on the viewing angle. The hidden secondary surface pattern is difficult for the viewer to recognize, and preferably not at all, particularly in incident light with daylight and / or a white light source. The hidden secondary surface pattern corresponds to at least one of the luminescent layers together with the perforation of the metal layer, in particular in the perforation area and / or according to a predetermined pattern. The perforation can be created by punching out, etching away, lasering, washing or otherwise removing or de-metallizing the metal layer.The hidden secondary surface pattern can form a further motif and / or information by means of the perforating elements or the perforating structure or the perforating pattern. The perforating elements can form a substructure of the motif. The perforating elements can correspond to a grid. For example, the elements can have the shape of crosses (as sub-structural elements) and, as a whole, together depict a cross as the overarching structure or shape of the perforation area. The elements that also perforate the primary surface pattern essentially correspond to de-metallized areas of the metal layer, i.e. areas that are not covered and / or coated with the metal layer. Therefore, the metal layer of the primary surface pattern is perforated or gappy. The perforating elements can be arranged regularly or chaotically in the surface.As already mentioned, the plurality of elements perforated into the metal layer or the plurality of elements perforating the metal layer (short "perforating elements") form the substructure, whereby the perforating elements together can form a higher-level (meaningful) motif. The hidden secondary surface pattern can also be machine-readable, i.e. generate an invisible emission (e.g. UV light) upon luminescence excitation, which can be detected by a measuring device and / or a detector. The first and / or second luminescent layer can be arranged above and / or below at least part of the primary surface pattern and / or within the perforating elements or perforations or gaps. The first and / or second luminescent layer can each correspond to a phosphor layer.The areas of the security element (also known as a foil security element) with the demetallized pattern can be backed with fluorescent colors as multiple luminescent layers (at least the first and second luminescent layers). The first and / or second luminescent layer can be excited in the UV-A range and emit light in the visible wavelength range, so that the hidden secondary surface pattern becomes visible to the human eye. Additionally or alternatively, as already mentioned, the emitted light can also be in the invisible wavelength range and therefore (only) machine-readable. The hidden secondary surface pattern can therefore also comprise a machine-readable security feature that emits light that is detectable, for example, in the invisible wavelength range, in particular in the UV-A range.The primary surface pattern, however, can include an optical security feature that is detectable in the visible wavelength range. The combination of the perforating elements, which correspond to demetallized areas in the metal layer, and the luminescent layers above, below, and / or between them has the effect that the hidden secondary surface pattern, and possibly a superordinate motif formed from it, becomes visible to the observer upon luminescence excitation by UV-A radiation.In addition, the security element can also have at least partial transparency in the area of ​​the respective perforating elements, so that the hidden secondary surface pattern becomes visible not only upon respective luminescence excitation from the side of the security element facing the viewer, but also in transmitted light, i.e. when a light, which can include white light but also UV-A light, is irradiated from the side of the security element facing away from the viewer. The irradiated light passes through the layers possibly present behind the luminescent layers and metal layer, so that either at least part of the white light becomes visible on the side facing the viewer, or luminescence excitation occurs and the emission light generated in the corresponding luminescent layer becomes visible to the viewer.The UV-A radiation can therefore be radiated from the side facing the viewer onto the security element and / or from its back in order to make the hidden secondary surface pattern visible. In this case, it is advantageous or even necessary for the luminescent layers to be at least partially transparent so that at least part of the light from the back can pass through the security element, in particular the luminescent layers, to the side of the security element facing the viewer. Therefore, in this case the perforation has the effect that the hidden secondary surface pattern and possibly a higher-level motif formed from it becomes visible to the viewer in transmitted light. In other words, the hidden secondary surface pattern can be revealed under the influence of luminescence excitation by the UV-A light and, if applicable,Even in transmitted light, a hidden motif, a pattern and / or a substructure and possibly a hidden higher-level motif become visible on a metallized foil security element, which is formed from the multitude of small de-metallized areas of the hidden secondary surface pattern. The term "transmitted light" is to be understood here as meaning that an incidence of light, such as daylight, from the side of the security element facing away from the viewer (back side, "from behind") falls through the perforations of the secondary surface pattern and / or the element pattern. The element pattern can comprise a further motif and / or information which is formed by means of the perforating structure (substructure made up of perforating elements). The secondary surface pattern orThe element pattern can therefore, in the corresponding embodiments, become visible to the viewer upon transmitted light incidence and upon light incidence from a light in the UV-A range of the corresponding excitation wavelengths that can excite the luminescent materials used. The security element can generally have a sandwich structure. In this embodiment, the sandwich structure can - without specifying the order of the layering - have the metal layer perforated with the elements of the hidden secondary surface pattern, with the relief structure of the optically variable primary surface pattern, and the two luminescent layers. In other words, the security element can have a sandwich structure that has a perforated metal layer and at least two luminescent layers arranged next to and / or one above the other in the region of the holes in the metal layer.In general, a sandwich structure of a security element described herein can be created and / or arranged on a carrier, wherein the carrier can be removed from the sandwich structure. In addition to the aforementioned mandatory and optional layers of the sandwich structure, there may also be some other functional layers which are described somewhat later in the description as possible embodiments. At least one of the at least two luminescent layers (the first and / or the second luminescent layer) can be arranged directly above and / or below the perforated metal layer and in this case span the plurality of elements perforating the metal layer, such that the luminescent layer can be irradiated through the perforating elements, i.e. through the holes, and emission radiation orcan emit luminescent radiation through them, in such a way that the viewer can see a motif in transmitted light and / or luminescence excitation, which motif results from and / or is composed of the elements of the hidden secondary surface pattern that perforate the metal layer, but is not recognizable in incident light with visible light. In order to achieve transparency while simultaneously protecting and / or supporting the layers, at least one semi-transparent layer that has a transparency of at least 25% can be arranged at least in the region of the first and / or second hidden motif area and in particular in the region of the hidden secondary surface pattern (preferably in the region of the plurality of perforating elements). At least one semi-transparent layer can therefore be arranged above and / or below the first and / or second hidden motif area and / or the primary surface pattern essentially over the entire surface.The semi-transparent layer can also have a filtering effect so that certain wavelengths cannot pass through the layer. The semi-transparent layer can additionally or alternatively correspond to a protective layer and / or a supporting carrier layer. The security element can be attached to a value document using the adhesive material or an adhesive layer in such a way that the adhesive material contacts a surface of the value document and / or a substrate. If the adhesive material is a radiation-curable material - for example, it comprises a UV-curing polymer - it can be cured after being applied to the value document by irradiation with a suitable wavelength. If the adhesive layer is irradiated through the perforating elements, the adhesive layer only hardens in certain places (islands). This creates adhesion islands in the adhesive layer.The adhesion islands form better adhesion to the target substrate than the surrounding uncured sections of the adhesive layer. The formation of island layers of adhesive material is particularly suitable for combating counterfeiting of valuable documents, since removal of the security element cannot be carried out non-destructively. The multiple point-like fixation of the security element on a valuable document can reliably lead to the valuable document and / or the security element tearing when attempted to be removed. Thus, the security element cannot be transferred from one valuable document to another object non-destructively. The adhesive material or the adhesive layer is preferably at least partially transparent, in such a way that it allows light to pass through to excite the luminescence of the luminescent layer and thus emitted light from the luminescent layer.transmitted and does not disturb or even hinder the function and effects of the security element according to the invention. The at least one element perforated into the metal layer can have at least one of the following shapes: a geometric shape, in particular triangular, rectangular, diamond-like, circular shape, preferably an annular or fully circular, in particular a dot-like shape, an alphanumeric character, a symbol, an ornament, a line and a grid. In general, the perforating elements can have individual shapes and, in their entirety and arrangement, can in turn form a higher-order shape or structure. In other words, the plurality of elements perforating (the metal layer) can have a substructure, whereby the elements together can form a higher-order motif. For example, as already mentioned, small cross-shaped elements can form a higher-order cross.The shapes of the elements can preferably be recognizable as such by the observer and have a corresponding dimension. For example, there can be uniform shapes, such as only circular shapes. However, there can also be different shapes, such as circular and rectangular. The perforating elements can have a size - such as length and / or width - of 10-500 μm and preferably of 50-250 μm. Preferably, the length (or a maximum size in one direction) and width (or a minimum size in one direction) of the perforating elements are in the (or the preferred) range. Alternatively, only the width is in the (or the preferred) range. The circular shapes can, for example, each have a diameter of 10-500 μm and preferably of 50-250 μm. The dimensions of the perforating elements can be uniform or non-uniform.With this dimension of the perforating elements, their shapes can still be visible or recognizable in transmitted light and / or luminescence excitation. The light reflected and / or scattered in incident light from the metal layer of the primary surface pattern does not outshine the light emitted by the luminescence layers due to luminescence excitation and / or the transmitted light that passes through the perforating elements so strongly, so that the viewer recognizes the shapes of the perforating elements by the light passing through. The perforating elements can have a lateral spacing from one another of 10 - 500 μm, preferably 50 - 250 μm. The spacing of the perforating elements is preferably greater than their size. The lateral spacing or side spacing between two perforating elements can in particular be a spacing between two mutually facing contour edges of two perforating elements.Here, the lateral distances are selected such that they correspond to the shortest distance between two mutually facing contour edges of two perforating elements. Alternatively, the lateral distances can also be the distances between the center points and / or geometric centroids or centers. The distances are preferably selected such that they can be perceived as individual perforating elements and their shape is still essentially recognizable. In the region of the perforating elements, the area ratio of the perforating elements (perforation area to perforated area) can preferably be between 10% and 60%, preferably between 20% and 49%, particularly preferably between 20% and 42%.The first luminescent layer and / or the second luminescent layer can comprise a fluorescent layer and / or a phosphorescent layer, wherein the fluorescent layer is configured to fluoresce and the phosphorescent layer is configured to phosphoresce. Luminescence can be understood as a collective term for luminous phenomena that exhibit essentially no thermal radiation. If the light emits luminescent radiation immediately after the luminescence excitation of the phosphor, i.e. within a time span of a few microseconds after the luminescence excitation of the phosphor medium, this is typically fluorescence. However, if the light is emitted with a longer delay after the luminescence excitation, wherein the delay is in the range of seconds or more, this is phosphorescence. In particular, luminescence excitation by UV-A light is described herein.In addition to the required luminescence of the two luminescent layers in the UV-A range, these or additional luminescent layers can also exhibit the following types of luminescence in other excitation ranges: photoluminescence outside the UV-A range, X-ray luminescence, sonoluminescence, radioluminescence, chemiluminescence, bioluminescence, triboluminescence, electroluminescence, and luminescence of technical phosphors, such as those in fluorescent lamps. A UV lamp for luminescence excitation of the luminescent layers with UV-A light is simple and straightforward to operate, and the security element can be verified quickly and easily. Photoluminescence typically occurs during and / or after illumination or luminescence excitation with UV-A light, whereby the wavelength of the emitted radiation is typically greater than that of the exciting radiation, since energy is lost through the (electronic) excitation or luminescence excitation.The optically variable surface pattern can comprise an embossed layer, above and / or below which the metal layer can be arranged. An embossed layer can comprise a polymer, for example a resin and / or a lacquer, into which a relief is incorporated and / or introduced. The relief is predetermined and its structure corresponds to the optically variable primary surface pattern. It can have a relief structure, such as a sub-wavelength structure, a nano- and / or microstructure, which, particularly after coating with a metal layer, produces an optically variable and viewing angle-dependent effect, such as an optically variable color impression and / or another optically variable effect, such as a walking effect, a 3D and / or floating effect, a hologram, a movement effect or the like.The metal layer can correspond to a thin metal foil and / or a vapor-deposited, sputtered and / or electrochemically applied metal layer. The metal layer can therefore serve as a mirror coating. A suitable reflector metal such as aluminum can serve as the metal. The metal layer can be arranged directly or indirectly with an intermediate layer on, below and / or above the embossed layer. An arrangement of a layer above or below another layer can generally be understood as an indirect or direct arrangement or layering. The perforating elements can also perforate the embossed layer and / or other layers, although this is not absolutely necessary and is purely optional.The aforementioned at least one at least partially opaque region can comprise an opaque edge region that at least partially surrounds the first hidden motif region and / or the second hidden motif region, and / or the security element can comprise an at least partially transparent edge region that at least partially surrounds the first hidden motif region and / or the second hidden motif region. The opaque region is a region that is substantially impermeable to visible light. The first hidden motif region and / or the second hidden motif region, and in particular the metal layer with the primary surface pattern and the hidden secondary surface pattern located therein, can therefore be embedded in the opaque (edge) region, which can, for example, appear particularly aesthetic. The opaque region can have a uniform color or multiple colors that appear particularly aesthetic.The opaque region can also comprise a coating that comprises and / or covers other elements, such as an adhesive layer and / or an electronic element. The opaque region can comprise an opaque layer or be formed by an opaque layer, wherein the opaque layer can serve as a substrate and / or support layer, in particular for the perforated metal layer. Otherwise, the opaque region can be formed from an opaque layer. In any case, the opaque region can be formed from an opaque layer that supports and / or stabilizes the first hidden motif area and / or the second hidden motif area and in particular the metal layer from the sides and / or from the underside. This can thus prevent, for example, the metal layer from accidentally tearing at its sides.The security element may additionally or alternatively comprise an at least partially transparent (i.e., at least partially non-opaque) region surrounding the first hidden motif area and / or the second hidden motif area and, in particular, the metal layer. An at least partially transparent region that at least partially surrounds the first hidden motif area and / or the second hidden motif area and possibly the metal layer, preferably the perforated metal layer, can create the impression for the viewer that only the central element, namely the security element according to the invention without additional visible edge regions, is arranged on the value document.This eliminates potentially distracting visible areas surrounding the central element, i.e., at least the first hidden motif area and / or the second hidden motif area, while at the same time providing sufficient contact surface to fix the security element to the value document and / or substrate. Therefore, this security element can be perceived as particularly aesthetic and not as a distracting element on a value document. The security element can, for example, be a patch, in particular an L-patch or a T-patch, a strip, in particular an L-LEAD or a T-LEAD, or a thread. Particularly in the case where the security element corresponds to a patch, a central area with optically variable features (such as color shift), including the opaque metal layers, can be embedded in a transparent and / or opaque edge area.It is particularly advantageous to provide a strip and / or a patch or even a thread for security purposes with the luminescent security feature according to the invention, the Class 2 feature, in order to thereby increase its security against counterfeiting. In general, a security element can therefore be an element that is to be applied and / or incorporated onto and / or into a substrate. For example, the security element can be applied to a substrate as a strip (e.g. from end-to-end on a banknote) or as a “patch” (locally limited on a banknote). Likewise, a security element can be incorporated into a substrate as a thread, for example in a paper machine. Patches, threads or strips can also be incorporated into the substrate by arranging them between partial layers of the target substrate. In general, security elements can be present with or without their own carrier.The carrier can be a plastic carrier and / or a film, such as a PET film. The carrier of the security element can therefore be transferred to a target substrate, such as a valuable document. Likewise, the security element (or a plurality of security elements) can be arranged on a transfer carrier. The security element is detached from the transfer carrier during transfer to the target substrate. The substrate of the valuable document can comprise one or more paper layers or one or more plastic layers, or a combination of paper and plastic layers. A LEAD corresponds to a strip and can extend across the length and / or width of a valuable document, for example a banknote. A patch, on the other hand, is locally limited and can therefore be smaller in its dimensions (length and / or width) than the valuable document itself.An L-patch or L-strip corresponds to a patch or strip that has been applied and / or inserted and has its own carrier. Such an L-patch or L-strip is applied and / or inserted onto / into a value document together with the carrier. In this notation, L stands for application, which is sometimes also referred to as “lamination.” A T-patch or T-strip corresponds to a patch or strip that has been applied and / or inserted and has been removed from a transfer carrier and applied and / or inserted onto / into a target substrate and / or value document. A T-patch can either have no carrier of its own or can optionally have its own carrier. In general, a security feature of a security element can, for example, be a feature that is printed on a substrate or is present in a substrate.A security feature can comprise features that serve to secure a banknote, such as printed IR / UV dyes and / or luminescent layers and / or fibers. According to one aspect, a method for producing a security element for a value document with a luminescent security feature comprises the steps of: arranging a first luminescent layer with at least a first excitation wavelength in the UV-A range to create a first hidden motif area; and arranging a second luminescent layer with at least a second excitation wavelength in the UV-A range to create a second hidden motif area, wherein the at least one second excitation wavelength differs from the at least one first excitation wavelength, wherein the emission wavelengths preferably also differ, so that different colors are emitted.The method for producing the security element has all the advantages and effects of the security element in the corresponding embodiment. The first luminescent layer and / or the second luminescent layer are preferably printed. One or both of the luminescent layers can be vapor-deposited. The first and second luminescent layers can be arranged in a transparent region and / or perforated region. The method can further comprise arranging a metal layer which comprises a relief structure corresponding to an optically variable surface pattern and / or is opaque in some regions and / or is provided with perforating elements, so that one or more opaque regions and / or one or more perforated regions are created. Fig.1a is a schematic representation of a security element according to an embodiment with luminescence excitation by means of a first excitation wavelength in the UV-A range, wherein the first hidden motif area becomes visible; Fig. 1b is a schematic representation of the security element according to the embodiment of Fig. 1a with luminescence excitation by means of a second excitation wavelength in the UV-A range, wherein the second hidden motif area becomes visible; Fig. 1c is a schematic representation of the security element according to the embodiment of Figs. 1a and 1b with luminescence excitation by means of the first excitation wavelength in the UV-A range and the different second excitation wavelength in the UV-A range, wherein the first and second hidden motif areas become visible; Fig. 1d is a schematic representation of a section along the section line through the security element according to the embodiment of Figs. 1a-1c;2a is a schematic representation of a security element in reflected light according to one embodiment; Fig. 2b is a schematic representation of the security element of Fig. 1a in transmitted light; Fig. 2c is a schematic representation of the security element of Fig. 1a in the case of luminescence excitation; Fig. 2d is a section from the schematic representation of the security element of Fig. 2c and schematically shows part of the plurality of perforating elements of the secondary surface pattern; Fig. 2e is a section from the representation of Fig. 2d according to a possible embodiment; Fig. 2f is a section from the representation of Fig. 2d according to an embodiment alternative to Fig. 2e; Fig. 2g is a schematic representation of perforating elements shown in Fig. 1e; Fig. 2h is a schematic representation of a security element in the case of transmitted light and / or luminescence excitation according to a further embodiment; Fig.3a is a schematic representation of a layering of a security element as a T-LEAD according to an embodiment; Fig. 3b is a schematic representation of a layering of a security element as an L-LEAD according to an embodiment; Fig. 4 is a schematic representation of a layering of a security element as a patch according to an embodiment; Fig. 5a is a schematic representation of a layering of a security element as an L-patch according to an embodiment; Fig. 5b is a schematic representation of a layering of a security element as a T-patch according to an embodiment; and Fig. 6 is a schematic representation of a method for producing a security element according to an embodiment. In the following, unless stated otherwise, the same reference numerals are used for identical and equivalently acting elements and / or features. A redundant description of recurring features and, if applicable,Redundant use of recurring reference numerals is partially avoided. The various embodiments and features of the figures described below are expressly combinable and should not be understood as complete versions. Fig. 1a is a schematic representation of a security element 1 according to an embodiment with luminescence excitation by means of light of a first excitation wavelength in the UV-A range, wherein the first hidden motif region 3a becomes visible because the light of the first excitation wavelength excites the first luminescent layer 7a and this emits light of a first emission wavelength. The first luminescent layer 7a with a first excitation wavelength and a first emission wavelength is in a plane on a carrier, for example a carrier layer 201 or carrier film, in the form of the letters "PL".The plane of the carrier, as well as the plane within which the first luminescent layer is arranged, is indicated by the xy plane spanned (parallel thereto). The said planes can be arranged essentially parallel to one another. The second excitation wavelength in the UV-A range is omitted during the luminescence excitation of the first luminescent layer 7a in this specific case. Fig. 1b is a schematic representation of the security element 1 of Fig. 1a during luminescence excitation by means of light of a second excitation wavelength in the UV-A range, wherein the second hidden motif region 3b becomes visible due to the fact that the light of the second excitation wavelength excites the second luminescent layer 7b and this emits light of a second emission wavelength. The first excitation wavelength in the UV-A range is omitted during the luminescence excitation of the second luminescent layer 7b in this specific case.The second luminescent layer 7b with a second excitation wavelength and a second emission wavelength is applied over a large area of ​​the carrier in or parallel to the xy plane, so that the entire carrier is covered. Since the first and second excitation wavelengths differ from one another, with targeted luminescence excitation of only the first luminescent layer 7a, only the first hidden motif area 3a can be made visible, and with targeted luminescence excitation of only the second luminescent layer 7b, only the second hidden motif area 3b can be made visible. Fig. 1c is a schematic representation of the security element 1 of Fig. 1a with luminescence excitation by means of the light of the first excitation wavelength in the UV-A range and the light of the different second excitation wavelength in the UV-A range, whereby the first and second hidden motif areas become visible.The first and second hidden motif areas are each visible at the same time, therefore the representation of the security element 1 in Fig. 1c corresponds to an overlay of the representations of the security element 1 in Figs. 1a and 1b. Fig. 1d is a schematic representation of a section along the section line W - V through the security element 1 according to the embodiment of Figs. 1a-1c. The representations in Figs. 1a-1c show a plan view of the security element 1 with the corresponding hidden security feature in the xy plane. Fig. 1d schematically shows the layering of the first luminescent layer 7a and the second luminescent layer 7b on the carrier layer 201 along the section line W - V, specifically in the yz plane, which runs perpendicular to the xy plane. Therefore, a sandwich structure is shown. The representation shows a carrier layer 201 of the security element 1, on which the first luminescent layer 7a is arranged directly.The second luminescent layer 7b is arranged directly on the first luminescent layer 7a. The second luminescent layer 7b does not outshine the first luminescent layer 7a when excited by luminescence using the first and second excitation wavelengths, so that the first and second hidden motif areas 3a and 3b become visible. It may be possible for the superposition of the two luminescent layers 7a and 7b to produce a mixed color effect in the area of ​​the first hidden motif area 3a. The schematic representation in Fig. 1d can be understood as a simplified representation, since further functional layers or plies may be present in the sandwich structure. In particular, further layers not initially shown here may be arranged between the carrier layer 201 and the luminescent layers 7a, 7b.Furthermore, the luminescent layers 7a, 7b can also be arranged one above the other in a reverse order than that shown here, i.e., the second luminescent layer 7b can be arranged on the carrier layer 201 and beneath the first luminescent layer 7a. Additionally or alternatively, the second luminescent layer 7b can lie at least partially in the same plane as the first luminescent layer 7a, specifically parallel to the indicated xy plane. As a rule, the security element 1 is larger than the hidden motif areas 3a, 3b (together), or the security element 1 comprises at least one further area outside the motif areas 3a, 3b. The entire surface of the security element 1 parallel to the xy plane (or the motif areas 3a, 3b) corresponds to a transparency area 10, since there are no layers that cover the luminescent layers 7a, 7b on the side facing the viewer.The carrier layer 201 can also be at least partially transparent, so that the rear side, i.e. the side facing away from the viewer, is also completely transparent and the two hidden motif areas 3a, 3b can be made visible from the rear side. A partially perforated metal layer 14 can be arranged above the luminescent layers 7a, 7b. In one (or more) perforation areas, the metal layer comprises elements 6 perforated into the metal layer 14, as will be explained in more detail below with reference to further embodiments. Fig. 2a is a schematic representation of a security element 1 in incident light according to a further embodiment. Fig. 2b is a schematic representation of the security element 1 of Fig. 2a in transmitted light and Fig. 2c is a schematic representation of the security element 1 of Fig. 2a with luminescence excitation (also "excitation") with the required first and / or second excitation wavelength.The security element 1 of this embodiment has the outer contour 1a of a star and can be used for authenticating and securing a valuable document and / or a valuable object. The security element 1 comprises an optically variable primary surface pattern 2, shown in Fig. 2a, which forms the shape of a star 2a that appears three-dimensional to the observer. In incident light, i.e. when visible light, for example white light, falls onto the security element 1 from the side of the observer, the star 2a emerging three-dimensionally from the surface appears as a motif of the primary surface pattern 2, as shown in Fig. 2a. The star 2a generated by the optically variable primary surface pattern 2 and appearing to emerge from the surface is indicated by the dashed line.The primary surface pattern 2 creates this three-dimensional motif 2a because it has a relief structure with an overlying metal layer that can create this motif. The relief structure corresponds to a micro- and / or nanostructure comprising a plurality of mirror elements (such as micromirrors) and / or lens elements (such as microlenses) that can create a viewing angle-dependent effect and thus such a 3D effect. The metal layer does not fill the entire star shape of the security element 1, but forms a smaller star within the outer contour 1a of a star of the security element 1. The metal layer 14 or the region of the primary surface pattern 2 is surrounded by a transparent (edge) region 8, which here forms the region between the outer contour 1a and the smaller star-shaped contour of the metal layer 14. The transparent region 8 can form a substantially transparent surface.The transparent (edge) region 8 completely surrounds the primary surface pattern 2 (as the inner region). Particularly in embodiments as strips (optionally also for a patch), the primary surface pattern 2 is surrounded by exactly two lateral, transparent edge regions. In the transparent region 8, the security element can, for example, comprise the carrier layer and / or an embossing lacquer layer and / or a transparent protective layer and / or an adhesive layer. These layers can equally be present in the (region of the) primary surface pattern 2, where the metal layer is preferably located on the embossing lacquer layer and / or beneath the protective layer. The transparent region 8 can also partially comprise the first and / or the second luminescent layer as a transparent luminescent layer. For example, this can prevent the metal layer from accidentally tearing and / or fraying at its sides.In the area of ​​the primary surface pattern 2, the metal layer is perforated in some areas. The primary surface pattern 2 therefore comprises an opaque area 4 and one (or more) perforation area(s) 5. These areas of the primary surface pattern are not visible in reflected light and are therefore not shown in Fig. 2a. The observer sees the motif of the primary surface pattern 2 in the opaque area 4 and in the perforation area 5. The transparent area 8 is preferably barely visible to the user in reflected light, i.e., in particular, not visible outside of a glancing angle. The embodiment shown is only shown as an example in the shape of a star, and any other shape is conceivable. The indicated three-dimensional effect of the optically variable primary surface pattern 2 is also only shown as an example, and the security element can instead or additionally have other effects, such as color effects, running, floating, or movement effects.In reflected light alone, as shown in Fig. 2a, the hidden secondary surface pattern 3 cannot be recognized or perceived. Only in a situation (in transmitted light) as shown in Fig. 2b will a perforation region 5 be visible. Only in a situation (luminescence excitation) as shown in Fig. 2c will the hidden secondary surface pattern 3 be visible or recognizable to the observer. Fig. 2b shows the security element 1 when viewed in transmitted light. The metal layer comprises an opaque region 4 and a perforation region 5 in which a plurality of perforating elements 6 are present. The elements 6 perforating the metal layer are thus illuminated "from behind" or from the side of the security element 1 facing away from the observer. The perforating circular elements 6, regularly spaced from one another and with a uniform radius, form a substructure 15.It is apparent to the observer that the majority of the perforating elements 6 together have the overarching shape 5a of a cross. The overarching shape 5a of the perforation area 5 with perforating elements 6 can also be referred to as a transmitted light motif of the security element. In the area of ​​the primary surface pattern 2 there are one (or more) perforated areas 5 and at least one non-perforated or opaque area 4. The perforated area 5 is preferably surrounded by a non-perforated or opaque area 4. In the present case, the primary surface pattern 2 is in turn surrounded by the transparent area 8. The transparent area 8 is not visible in transmitted light (and preferably also in reflected light). The substructure 15 is preferably not visible to the observer with the naked eye (without aids) in transmitted light.The hidden secondary surface pattern 3 not only has the plurality of elements 6 perforating the metal layer, but also the at least one first luminescent layer 7a and the at least one second luminescent layer 7b, for example as shown similarly in Fig. 1d or in the subsequent figures. The luminescent layers 7a, 7b can be at least partially transparent in order to be able to transmit light from the back. In the example shown, the luminescent layers 7a, 7b are arranged in the perforation region 5 of the perforating elements 6. The at least two luminescent layers 7a, 7b can be arranged above, below and / or in at least part of the perforating elements 6. In Fig.2c, for example, a UV-A light comprising the mutually different excitation wavelengths (the first and the second excitation wavelengths) is radiated onto the security element 1 to excite the luminescence of the luminescent material of both luminescent layers 7a, 7b. The luminescence excitation (with one or both excitation wavelengths) can be radiated in transmitted light ("from behind", side of the security element 1 facing away from the viewer) and / or in reflected light ("from the front", side of the security element 1 facing the viewer). Since the emission wavelengths of the luminescent layers 7a, 7b can also differ, the hidden secondary surface pattern 3, which can comprise the first and the second hidden motif area 3a, 3b, can appear multicolored, in particular when the luminescent layers 7a, 7b are arranged at least partially next to one another under the perforating elements 6.The luminescent layer 7a can, for example, be present in the perforation area 5, and the luminescent layer 7b can be present over the entire surface (or both in the perforation area 5 and in the edge area 8). Accordingly, as indicated in Fig. 2c, the emission of both luminescent layers—i.e., the hidden motif area 3a and the motif (partial) area 3b—appears in the perforation area 5, and the emission of the second luminescent layer 7b or its motif partial area 3b appears in the transparent area 8. Upon luminescence excitation with only the first / second excitation wavelength, only the first / second motif partial area 3a / 3b appears. If the emissions of the two luminescent layers can be distinguished by color for the observer, the security element is particularly easy to verify. Not shown in Fig. 2c, but other regional arrangements of the two luminescent layers 7a and 7b or further luminescent layers are conceivable.The luminescent layers could be arranged overlapping and / or adjacent to one another. For example, Fig. 1 could be viewed as a section of the motif areas 3a, 3b visible within the perforation area 5. For the observer, the substructure preferably remains invisible to the naked eye upon luminescence excitation. They see the luminescence of the luminescent layers in the perforated area 5a (and in the transparent area 8) and can recognize the shape of the perforated area and / or, if applicable, the underlying sub-areas of the luminescent layers. Fig. 2d is a section from the schematic representation of the security element 1 in Fig. 2c (or 2b) and schematically shows part of the plurality of perforating elements 6 of the secondary surface pattern 3.It can be seen that the perforating elements 6 form a substructure 15 in which the perforating elements 6 are circular, of uniform size, and uniformly spaced from one another. Fig. 2e and Fig. 2f are alternative sections from the illustration in Fig. 2d according to two possible embodiments. According to Fig. 2e, the perforating elements 6 can be circular and have a full-surface or point-shaped design. Light can therefore be transmitted and emitted within the entire region of the circular perforating elements 6. Alternatively, the perforating elements 6 in Fig. 2e can be circular and annular. Light can therefore only be transmitted and emitted within the annular region of the perforating elements 6. A further advantageous effect of the perforating elements 6 will now be briefly described with reference to Fig. 2e and Fig. 2f.The security element can comprise an adhesive layer and / or be attached to a target substrate by means of an adhesive layer. The adhesive layer is preferably a (UV) radiation-curable adhesive layer. If the radiation-curable adhesive layer is then irradiated through the perforating elements 6 (with appropriate UV light), the adhesive layer hardens only in places, namely in the region of the perforating elements 6. At the time of irradiation or transfer to a target substrate, an adhesive layer that is only cured in places (or in islands) is then created. Fig. 2e and Fig. 2f show a simplified illustration of the position of the adhesion islands 9 in the otherwise uncured adhesive layer; these islands correspond in size and position to the perforating elements 6 in the (overlying) metal layer 14.This is an optional possibility to prevent the security element 1 from being non-destructively removed from the target substrate and transferred to a different substrate and / or object than the original value document to which it is connected via the adhesive islands 9. If the security element 1 is pulled off the value document to which it is better connected in places (by means of the adhesive islands 9), the security element 1 or the target substrate tears. All perforating elements 6 shown herein can optionally produce such cured adhesive islands 9 from adhesive or another adhesive material, without the corresponding sections of the following or previous description explicitly mentioning this. Fig. 2g is a schematic representation of perforating point-shaped elements 6 shown in Fig. 2e. A first perforating element 6a has a distance d a from a second perforating element 6b.The second perforating element 6b has a distance db from a third perforating element 6c. The distances da and db between two nearest adjacent perforating elements 6a, 6b, 6c are identical to one another here. The distances da and db correspond to the shortest distances between the respective outer contours of two perforating elements 6a, 6b, 6c. The size, i.e. the radius r, of the perforating elements 6a, 6b, 6c is also uniform here. The shapes of the perforating elements 6 shown are only examples. Other, non-homogeneous shapes with non-uniform spacing and non-uniform size can also be used. Fig. 2h shows an alternative to the previous perforating elements 6. Fig. 2h is therefore a schematic representation of a security element 1 upon luminescence excitation by means of the UV-A light of the first and second excitation wavelengths (and / or in transmitted light) according to another embodiment.Each perforating element 6 has the shape of a cross. The substructure 15 formed by the arrangement of the cross-shaped perforating elements 6, in turn, results in a cross as the higher-level shape 5a. The viewer can recognize the higher-level shape 5a and the shape of the perforating elements 6. In the example in Figure 2h, the individual perforating elements 6 could each be backed with different luminescent layers 7a, 7b, 7c, for example alternately or in a (multi-color) pattern. Perforating elements 6 can be designed (in terms of their size) in such a way that the viewer can only recognize the shape of the perforating elements 6 with aids such as a magnifying glass or camera (Fig. 2c) or can already recognize it without aids, with the naked eye (Fig. 2h). Analogously, the substructure 15 can only be recognized with aids such as a magnifying glass or camera, or can already be recognized without aids, with the naked eye.Alternatively, for example, small microscopic symbols such as an "A" could also result in a macroscopic symbol such as an "A". For example, small microscopic symbols such as an "A" could also result in a microscopic symbol such as a "B". Furthermore, different symbols such as "§&A+T&#..." could also result in or form a macroscopic number such as "100". Various possible layerings of the security element 1 for different embodiments are shown below. The layerings always each have at least one first and at least one second luminescent layer 7a, 7b. The at least one first and at least one second luminescent layer 7a, 7b correspond to two types of luminescent layers 7a, 7b, which partially overlap with one another. According to the invention, the two luminescent layers 7a, 7a have different excitation and / or emission wavelengths.In all of the following embodiments, the already described embodiments, in particular the areas, including motif areas, perforation area(s), opaque area(s) and / or edge area, can be present, even if they are not addressed again or shown figuratively. Fig. 3a is a schematic representation of a layer 200a of a security element 1 as a transfer strip (T-LEAD) on a transfer carrier 300 according to one embodiment. The layer 200a lies on the transfer carrier 300 in the form of a carrier film. A release layer 202 (and / or adhesion layer) is first applied to the transfer carrier 300, which on the one hand connects the other layers to the transfer carrier 300, but if necessary - namely during the transfer of the security element to a target substrate - allows them to be removed from the transfer carrier 300. The transfer carrier 300 can therefore be removed from the remaining layers.The transfer carrier 300 can therefore be considered not to belong to the security element 1. The release layer 202 borders an embossed layer 4b with a relief structure 4a and, underneath, a metal layer 14. The embossed layer 4b with a relief structure 4a and a metal layer 14 essentially forms the optically variable primary surface pattern 2. During production, the relief structure 4a can be incorporated into the embossed layer 4b. The metal layer 14 can then be applied and / or arranged for mirroring. The metal layer 14 has perforations in the form of the perforating elements 6. These perforations can be created after the application of the metal layer 14 according to the various methods described herein. The at least two luminescent layers 7a, 7b can be applied to the perforated metal layer 14, directly or indirectly with an intermediate layer. In the embodiment of Fig.3a shows three exemplary luminescent layers 7a, 7b, which may in particular be fluorescent layers, in regions. A first luminescent layer 7a (luminescent layer 7a of the first type, indicated on the far left) with the first excitation wavelength and the first emission wavelength is not overlaid by the second luminescent layer 7b (luminescent layer 7b of the second type, indicated on the far right) with a second excitation wavelength and emission wavelength, and another centrally indicated first luminescent layer 7a or luminescent layer 7a of the first type is overlaid by the second luminescent layer 7b with a second excitation and emission wavelength (right). The two luminescent layers 7a, 7b can generally lie next to one another essentially in one plane or can be at least partially layered one above the other.In this way, the secondary surface pattern can, on the one hand, require multiple excitation wavelengths for complete detection, but can also emit different wavelengths or colors, which appears particularly aesthetically pleasing and effective and gives the security element 1 a higher verification quality. The luminescent layers 7a, 7b are covered by a primer and / or protective layer 203 to prevent them from detaching from the metal layer. An HSL layer as an adhesive layer 204 (HSL: heat seal lacquer) is arranged over the primer and / or protective layer 203. The security element, i.e. in particular the layers 4b, 14, 7a, 7b, and 203, can be attached to a target substrate with the aid of the adhesive layer 204. The metal layer 14 can be understood as a layer that is opaque (impermeable) to the luminescent excitation light and emission light.However, the luminescent layers 7a, 7b, the HSL layer 204, and the primer and / or protective layer 203 are at least partially transparent to the luminescence excitation light and the emission light, so that a viewer from this side can recognize the achieved effect, namely the hidden secondary surface pattern 3 upon luminescence excitation. The hidden secondary surface pattern 3 may also be recognizable from the opposite side upon luminescence excitation, particularly if the transfer carrier 300 has been removed. The release layer 202 may be transparent to the emitted light. It may remain at least partially or completely on the substrate after the transfer of the security element (detachment from the transfer carrier 300). Fig. 3b, for example, shows that a carrier layer can remain at least partially or completely on the substrate and / or be at least partially or completely transferred to the target substrate.Position A2 indicates an alternative or additional position, specifically between release layer 202 and embossing layer 4b, in particular embossing lacquer layer, on which the one or more additional or alternative luminescent layers can be arranged. Fig. 3b is a schematic representation of a layering 200b of a security element 1 as a stripe transferable to the target substrate (L-LEAD) according to one embodiment. Layering 200b differs primarily from that of Fig. 3a in that carrier layer 201 is part of security element 1. Optionally, an uppermost ink-accepting layer 205 is also present. Position B2 indicates a further alternative or additional position, specifically between ink-accepting layer 205 and substrate 201, in particular PET layer, on which the one or more additional or alternative luminescent layers can be arranged. Fig.4 is a schematic representation of a security element 1 as a patch on a transfer carrier 300 according to one embodiment. In particular, a plurality of patches (not shown) are present on the transfer carrier 300. In contrast to the layers 200a and 200b, the layering of the security element comprises several, here four, HSL sublayers 204. The HSL sublayers later jointly form an adhesive layer to the target substrate. Furthermore, the layering comprises an optional carrier layer 211 and several optional protective or primer layers 213. In this and all other embodiments, the transfer carrier 300 can comprise two carrier layers 301, which are bonded to one another via an adhesive layer 302. The transfer carrier 300 comprises the uppermost carrier layer 301, which serves as a support film, and a carrier layer 301 located directly below it, which is separated from the support film by a laminating adhesive layer as an adhesive layer 302.As is known, the layer structure of the security element on such a transfer carrier can be particularly well divided / separated into regions (for example by punching or lasering the layer structure) without causing the transfer carrier 300 to tear. The three uppermost layers 301 and 302 can be peeled off or removed from the security element 1. In the layering of the security element, the luminescent layers 7a, 7b of the two different types (i.e., the different excitation wavelengths) are arranged next to one another. The carrier layer 211 of the security element is arranged between the protective layer 203 and the lowermost HSL sub-layer 204. Fig. 5a is a schematic representation of a layering 400a of a security element 1 as a patch that can be transferred to a target substrate, according to one embodiment.The layering 400a comprises, in the following order: an uppermost PET layer 201, a lacquer layer 401, a further PET layer 201, a further lacquer layer 401, a further PET layer 201, a primer layer 203, an embossing lacquer layer 4b, a perforated metal layer 14, the luminescent layers 7a, 7b of the two different types lying above and next to one another, a protective layer 203, and an HSL layer 204. Positions A4 and B4 indicate alternative or additional positions at which the or further or alternative luminescent layers can be arranged, namely A4: between the release layer 202 and the further lacquer layer 401, and B4: between the uppermost primer layer 203 and the embossing lacquer layer 4b. Fig. 5b is a schematic representation of a layering 400b of a security element 1 as a T-patch on a transfer carrier 300 according to an embodiment.The layering 400b comprises, in the following order: an uppermost PET layer 301, a first release layer 402 and a second release layer 403, an embossing lacquer layer 4b, a perforated metal layer 14, the luminescent layers 7a, 7b of the two different types lying above and next to one another, a primer layer 203, and an HSL layer 204. Position C4 indicates an alternative or additional position at which further or alternative luminescent layers can be arranged, namely C4: between the second release layer 403 and the embossing lacquer layer 4b. The described layers 200a, 200b, 400a, 400b are schematically equipped with the indicated UV-A active luminescent layers (also UV-A layers). There may also be more UV-active, and especially UV-A active, layers in the layering, for example, three, four, five, six, or more. The UV layers can be arranged side by side or on top of each other.The use of such layerings in threads is also possible. However, this use is rather limited due to the usually small surface area of ​​the threads. Threads are introduced into a paper substrate - preferably in a paper machine. All embodiments are suitable in principle for being introduced between partial layers of a target substrate. In such embodiments, for example, a second adhesive layer can be used, which is arranged on the other side of the security element in order to achieve good adhesion of the security element in the target substrate. The layers with the same reference numerals and / or designations of the described layers 200a, 200b, 400a, 400b or the previous figures can have similar or identical properties, such as transparency or partial transparency, therefore redundant information is not reproduced in detail for each embodiment. Fig.6 is a schematic representation of a method 100 for producing a security element 1 according to one embodiment. The method 100 for producing the security element 1 for a value document with a luminescent security feature comprises the steps: arranging 101 a first luminescent layer 7a with at least one first excitation wavelength in the UV-A range in order to generate a first hidden motif area 3a; and arranging 102 a second luminescent layer 7b with at least one second excitation wavelength in the UV-A range in order to generate a second hidden motif area 3b, wherein the at least one second excitation wavelength differs from the at least one first excitation wavelength. The emission wavelengths can also differ, so that different colors are emitted.The arrangement 101 of the first luminescent layer 7a and the second luminescent layer 7b can take place in a transparency region 10 or a perforation region 5. In this case, the method 100 can comprise further steps, such as the arrangement 103 of at least one metal layer. The metal layer is opaque in some regions or provided with perforating elements. This creates the one or more opaque regions and the one or more perforation regions. The metal layer is preferably first applied over the entire surface and subsequently provided with the perforating elements. Alternatively or additionally, the metal layer can be provided with a relief structure corresponding to an optically variable surface pattern. Further layers of the security element can be applied in further steps. Depending on their position in the multilayer structure, the further steps can take place before, after, or between the aforementioned steps 101-103.In a manner known per se, the layers are applied in particular starting from the transfer carrier 300, a production carrier or starting from a carrier layer 211 of the security element.

[0002] List of reference symbols Security element a Outer contour of a star (optically variable) primary surface pattern a Motif (star) with 3D effect created by the optically variable primary surface pattern (hidden) secondary surface pattern a First hidden motif area b Second hidden motif area Opaque area a Relief structure b Embossed layer Perforation area a Superior shape (e.g. cross),which is formed by the perforating elements or their substructure (An element perforating the metal layer) or elements perforated into the metal layer a A first (perforating) element b A second (perforating) element c A third (perforating) element a First luminescent layer with a first excitation and / or emission wavelength b Second luminescent layer with a second excitation and / or emission wavelength Transparent edge region Adhesive islands 0 Transparency region 4 Metal layer 5 Substructure 00 Method for producing a security element 01 Arranging a first luminescent layer with at least a first excitation wavelength in the UV-A range in order to create a first hidden motif area 02 Arranging a second luminescent layer with at least a second excitation wavelength in the UV-A range,to create a second hidden motif area 03 Arranging at least one metal layer 200a Layering of a security strip on transfer carrier 200b Layering of a security strip 201 Carrier layer, in particular PET carrier film 202 Release layer and / or adhesion layer 203 Primer or protective layer 204 Adhesive layer 205 Ink acceptance layer 211 Carrier layer 213 Protective layer 300 Transfer carrier for security element 301 Film layer,in particular PET carrier and / or support film 302 Laminating adhesive 211 Carrier layer of the security element 213 Primer layer or protective layers 400a Layering of a security element as an L-patch 400b Layering of a security element as a T-patch on transfer carrier 401 Lacquer layer 402 Release layer 1 403 Release layer 2 A Position in layering for alternative or additional luminescent layer B Further position in layering for alternative or additional luminescent layer C Further position in layering for alternative or additional luminescent layer da First distance: Side distance between first and second perforating element db Second distance: Side distance between second and third perforating element r Radius of a circular element WV Cutting line,

Claims

Patent claims 1. A security element (1) for a value document, comprising: a first hidden motif area (3a) having a first luminescent layer (7a) with at least one first excitation wavelength in the UV-A range; and a second hidden motif area (3b) having a second luminescent layer (7b) with at least one second excitation wavelength in the UV-A range that differs from the at least one first excitation wavelength.

2. A security element (1) according to claim 1, further comprising at least one transparency area (8, 10), wherein the first hidden motif area (3a) and / or the second hidden motif area (3b) is arranged in the transparency area (8, 10) of the security element.

3. A security element (1) according to claim 1 or 2, wherein the first luminescent layer (7a) and the second luminescent layer (7b) at least partially overlap with one another. 4.Security element (1) according to one of the preceding claims, further comprising at least one at least partially opaque region (4) and / or at least one (or more) perforation region(s) (5).

5. Security element (1) according to claim 4, wherein the opaque region (4) and / or the perforation region (5) comprises a metal layer (14), and wherein the metal layer (14) preferably comprises a relief structure (4a) representing an optically variable surface pattern (2).

6. Security element (1) according to one of the preceding claims, wherein the first luminescent layer (7a) and the second luminescent layer (7b) lie at least partially in a common plane or in a common plane region. 7.Security element (1) according to one of claims 5 or 6, wherein the metal layer in the perforation region (5) comprises at least one element (6) perforating the metal layer, preferably a plurality of elements (6) perforating the metal layer (14) and / or a grid of perforating elements (6); and / or. wherein the first hidden motif area (3a) and / or the second hidden motif area (3b) overlap with the perforation area (5).

8. The security element (1) according to one of the preceding claims, wherein the security element further comprises a radiation-activatable adhesive layer (204), wherein an adhesion island (9) can be generated in the adhesive layer (204) preferably by irradiating the adhesive layer (204) through the element (6) perforating the metal layer (14).

9. The security element (1) according to claim 7 or 8, wherein the at least one element (6) perforated into the metal layer (14) has at least one of the following shapes: a geometric shape, in particular triangular, rectangular, diamond-like, circular shape, preferably an annular or full-surface circular shape, an alphanumeric character, a symbol, an ornament, a line, and a grid.Security element (1) according to one of the preceding claims, wherein the first luminescent layer (7a) and / or the second luminescent layer (7b) comprises a fluorescent layer and / or a phosphorescent layer, wherein the fluorescent layer is configured to fluoresce and the phosphorescent layer is configured to phosphoresce; and / or wherein the luminescence of the first and second luminescent layers is different, in particular different in the emission spectrum, which preferably gives rise to different first and second color impressions.

11. Security element (1) according to one of claims 5-10, wherein the optically variable surface pattern (2) comprises an embossed layer (4b) above and / or below which the metal layer (14) is arranged. 12.Security element (1) according to one of claims 4-11, wherein the at least one at least partially opaque region (4) at least partially surrounds the first hidden motif region (3a) and / or the second hidden motif region (3b) and / or the perforation region (5); and / or the opaque region (4) and / or the perforation region (5) form an inner region of the security element (1) which is surrounded by exactly one, circumferential, transparent edge region (8) or by exactly two, laterally delimiting, transparent edge regions (8).

13. Security element (1) according to one of the preceding claims, wherein the security element is a patch, in particular a lamination or transfer. Patch, a strip, in particular a laminating or transfer strip, or a thread; and / or; both excitation wavelengths are in the UV-A range between 315 and 405 nm, preferably between 350 and 400 nm.

14. A method (100) for producing a security element (1) for a value document with a luminescent security feature, comprising the steps of: arranging (101) a first luminescent layer (7a) with at least a first excitation wavelength in the UV-A range to create a first hidden motif area (3a); and arranging (102) a second luminescent layer (7b) with at least a second excitation wavelength in the UV-A range to create a second hidden motif area (3b), wherein the at least one second excitation wavelength differs from the at least one first excitation wavelength.Method according to claim 14, wherein the arrangement of the first and the second luminescent layer (7a, 7b) takes place in a transparency region (8, 10) and / or a perforation region (5) and wherein the method preferably further comprises: arranging (103) a metal layer (14) which - comprises a relief structure (4a) which corresponds to an optically variable surface pattern (2), and / or - is opaque in some regions and / or is provided with perforating elements, so that one or more opaque regions (4) and / or one or more perforation regions (5) are created.

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