WO2019201877A1 - Critère de sécurité à base de substance fluorescente vérifiable par ordiphone et système de vérification - Google Patents

Critère de sécurité à base de substance fluorescente vérifiable par ordiphone et système de vérification Download PDF

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Publication number
WO2019201877A1
WO2019201877A1 PCT/EP2019/059709 EP2019059709W WO2019201877A1 WO 2019201877 A1 WO2019201877 A1 WO 2019201877A1 EP 2019059709 W EP2019059709 W EP 2019059709W WO 2019201877 A1 WO2019201877 A1 WO 2019201877A1
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WO
WIPO (PCT)
Prior art keywords
phosphor
security feature
smartphone
emission
security
Prior art date
Application number
PCT/EP2019/059709
Other languages
German (de)
English (en)
Inventor
Detlef Starick
Manfred Paeschke
Lazar KULIKOVSKY
Thomas JÜSTEL
Beata MALYSA
Viktor Anselm
Guido HAUßMANN
Original Assignee
Bundesdruckerei Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bundesdruckerei Gmbh filed Critical Bundesdruckerei Gmbh
Priority to ES19722000T priority Critical patent/ES2940565T3/es
Priority to EP19722000.7A priority patent/EP3781408B1/fr
Priority to CN201980025993.9A priority patent/CN112203863B/zh
Priority to PL19722000.7T priority patent/PL3781408T3/pl
Publication of WO2019201877A1 publication Critical patent/WO2019201877A1/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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • 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
    • B42D25/387—Special inks absorbing or reflecting ultraviolet 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
    • G07D7/06—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 feature with a phosphor that can be verified with the aid of a commercially available smartphone.
  • the invention also relates to an arrangement for verifying a security document with such a security feature.
  • Presence can be detected by the excitable with simple handsets (UV or IR radiation sources) and usually taking place in the visible spectral emission of the phosphors. In addition, they serve the copy protection.
  • luminescent security features equipped with particularly high counterfeit security are also used as machine-readable level 3 features. The authenticity verification of such features is usually associated with a high technical complexity.
  • the photochromic security feature shows a change in color and / or a change in shape under the effect of a flashlight excitation. It is further described that the security feature is based on a retinal protein.
  • an identification feature with at least two identification elements arranged in a defined limited area for the identification of an object is known. After irradiating the surface with visible light, a first identification element consisting of ink or ink is visually visible and a second identification element is not visually visible.
  • a light generating device for example, an LED flash unit
  • an image recording device for example, a digital camera of a mobile communication device
  • WO 2013/034603 A1 describes a method for verifi cation of a security document with a security feature in the form of a fluorescent printing element.
  • the method provides that the pressure element by means of a light source is excited and it emits an electro-magnetic radiation as a result of this excitation, which can be detected in a further step by means of a sensor. By comparing with given data, the collected data is evaluated. The verification result is given in a further step depending on the result of the comparison.
  • the method should be performed with a smartphone, wherein the flash module of the smartphone as excitation source and the photo sensor of the camera of the smart phone come as a detection unit for use.
  • phosphors for the pigment-like fluorescent printing element inorganic phosphors are called, namely nitride phosphors; Europium-doped alkaline earth orthosilicate and alkaline earth oxyorthosilicate phosphors; Cerium-doped rare earth-metal-gallium-garnet phosphors; red light emitting (Ca, Sr) S: Eu 2+ ; and green emitting SrGa 2 S 4 : Eu 2+ .
  • the proposed phosphors are extremely fast decaying so-called LED conversion phosphors.
  • a second problem results from the fact that the designated in the art for use as security features phosphors usually have just as short decay times in the ns to ys range, as applicable for the reasons mentioned for the flash LED are. If flashed by a smartphone, the emissions from the security feature are either completely superimposed by the flash, or they have already faded before being captured.
  • the invention is to provide an arrangement for verifying such a security feature.
  • the object is achieved by a verifiable with a smartphone, fluorescent-based safety feature according to the appended claim 1 and by an arrangement for verification of such a security feature according to the attached independent claim 11th
  • a general solution to the mentioned object, which the invention implements, consists first of all in the fact that a security feature is equipped with a specific phosphor which avoids the problems described above.
  • This phosphor must be configured so that it is on the one hand with a light source of a smartphone or a similar mobile computing device, ie in particular a flash LED of a smartphone, excitable. At the same time, the phosphor must be one
  • the invention provides a reliably evaluable security feature which allows exclusive luminescence properties such as the spectral emission and
  • the invention provides a Level-3 feature or at least one Level-2 + functionality feature, as disclosed in U.S. Patent Nos. 4,666,866 and 5,200,264
  • Security and value documents can be used for authenticity verification. Such features are invisible to the human eye as a rule, for example, even after excitation with UV or IR light sources.
  • Expense for example, with the help of high speed sorting machines to be tested.
  • the present invention makes it possible for the first time to verify the authenticity of such exclusive features with the aid of commercially available smartphones.
  • the security feature according to the invention can be applied to or in a value or security document and comprises a phosphor which can be excited to luminescence with an electromagnetic radiation of predetermined wavelength, as can be generated by a lighting unit of a smartphone, whereupon the phosphor is one of the Camera device of a smartphone emitted detectable radiation.
  • the emission of the phosphor has a decay time in the ms range.
  • the cooldowns in the range between 1 to 100 ms, more preferably in the range between 5 to 50 ms, more preferably selected between 10 and 30 ms.
  • the decay process basically characterizes the time-dependent decrease in the intensity of the radiation emitted by a luminous substance.
  • the decay curve can often use a simple exponential equation of the form
  • luminescent substances have a mono-exponential decay. Rather, multi ⁇ exponential resulting from the superposition under Kunststoffaji relaxation processes, if appropriate (for example, bi- or triexponential) decay curves.
  • Such phosphors are characterized by a high absorption strength at 450 nm, a high luminescence intensity and efficient energy transfer between the ⁇ Ce 3+ and Mn 2+ ions.
  • the phosphor having the formula:
  • Ce 3+ ions are preferably incorporated onto Ca 2+ and the Mn 2+ ions are preferably incorporated on Sc 3+ lattice positions.
  • the phosphor by the following
  • Camera modules of standard smartphones can be detected.
  • the emission spectra of the phosphors according to the invention consist of three bands each, the direct luminescence of the Ce 3+ activator ions (band with an X max of about 505 nm), as well as on the Ce 3+ - Mn 2+ energy transfer enabled emissions of the different lattice sites
  • Mn 2+ coactivators can be assigned.
  • the maxima of the latter emission bands are approximately at 570 nm (Mn 2+ on Ca 2+ space) and at around 700 nm (Mn 2+ on Sc 3+ space).
  • the relative intensities of the different emission bands can be determined by the concentrations of the activator and coactivator ions as well as by the respective concentration levels. Ratios are varied and adjusted. In addition, the individual emissions have different spectral decay times. While the decay time of the Ce 3+ emission allowed by quantum mechanics is in the nanosecond range, cooldowns in the two Mn 2+ emission bands resulting from quantum-mechanically forbidden optical transitions are reduced
  • Characteristic overlays have no mono-exponential decay curves. Characteristic are bi- or triexponential decay curves.
  • Ca3Sc2Si30i2 Ce 3+ , Mn 2+ phosphors included.
  • these phosphors for use in luminescent security features whose presence and authenticity can be verified with the help of standard smartphones recommend.
  • the named luminaires Substances in the ultraviolet spectral range are practically non-excitable and, secondly, the body color of the corresponding luminescent pigments is such that it easily adapts to the color designs of the security and value documents to be protected (banknotes, identity cards, passports, driver's licenses, etc.).
  • the table contains information on the measured maxima of the respective emission bands and on the decay times.
  • the phosphors listed are essentially Ce 3+ - and Mn 2+ - codoped silicate garnets or
  • Germanate garnets to activate with Mn 2+ ions and, if appropriate, additionally with certain rare earth ions (Ce 3+ , Eu 2+ , Dy 3+ ) co-activated complex silicate or phosphatic
  • Phosphor mixtures are used, the individual, preferably exclusive components have different and sensory distinguishable cooldowns. Also in this case results in an increase in the security against forgery of the security features of the invention.
  • the phosphor has a cooldown in a one-digit or two-digit ms range, so that the
  • Emission of the phosphor with an image capture unit, in particular with a camera of a smartphone can be detected.
  • Currently known smartphone cameras have a frame rate in the range of 240 fps (frames per second) up to 960 fps. Higher frame rates are conceivable especially in future devices, which is the use of the invention described here but does not conflict.
  • the smartphone camera records a first image after about 4.2 ms or, in exceptional cases, after 1 ms.
  • the frame rate of the image sensor used determines a lower limit for the
  • the security feature in terms of the realization of a particularly high level of security is not to be recognized by the human eye
  • an upper limit is given by the physiology of human vision.
  • the decay time of the luminescent substance in this case should be less than 1 s, since a luminescent of the phosphor, which lasts longer than 1 s from the human normal observer can be perceived.
  • the phosphor is a Ce 3+ or Mn 2+ co-doped silicate garnet phosphor.
  • the stationary luminescence of the phosphor has excitation with the light of white emitting LED, preferably at a maximum wavelength of 450 nm, a broadband emission spectrum with multiple emission maxima in the visible spectral range. These maxima are around
  • the spectral decay times of the different emission bands are in the order listed in the ns, in the single-digit or in the two-digit ms range.
  • the decay time of the phosphor of the security feature is in the range of 1 ms to 50 ms.
  • a phosphor of the security feature is preferably in the range of 1 ms to 50 ms.
  • the phosphor is configured so that it can be excited in the visible spectral range, in particular in the blue spectral range, so that the flash light source of the smart phone can deliver this excitation radiation. Furthermore, the phosphor is configured to be visible
  • the phosphor is configured so that its
  • the white light of a lighting unit of a smartphone is generated by an LED which consists of an LED semiconductor chip emitting, for example, at approximately 450 nm and one or more LED conversion phosphors placed above the LED semiconductor chip. These conversion luminescent substances are able to convert the emission of the blue LED proportionally into longer-wavelength visible luminescence radiation (broadband emissions in the green, yellow and red spectral range) with an emission maximum of, for example, about 560 nm.
  • the white light of the LED which is available as a lighting unit for conventional smartphones, results from the additive color mixing of the individual described
  • Luminescence components wherein the blue spectral component has the much higher intensity.
  • usable phosphor must preferably be configured so that it has a high efficiency of the spectral excitability, in particular in the range between 420 nm to 470 nm.
  • the maximum of the spectral excitability of the phosphor is about 450 nm.
  • the smartphone camera is available as image capture unit.
  • the image capture unit is equipped with a CMOS sensor and an IR filter. She has one
  • Spectral sensitivity which covers the entire visible spectral range to about 750 nm.
  • the mobile terminal used according to the invention for the verification of the security feature is preferably a conventional smartphone. It is understood by those skilled in the art that the same functionality can also be integrated into a tablet or a similar multifunctional data processing device, for which it must be equipped with a camera with image capture unit and / or lighting unit and a data processing unit. Such devices having the same effect should also be included in the invention.
  • the data processing unit is preferably a processor, in particular a microprocessor.
  • the phosphor in the security feature is so
  • the phosphor pigments are preferably applied as a defined pattern on a support.
  • the pattern may be arranged as a shape, for example a triangle or a star.
  • the security feature pattern formed by the phosphor itself may contain data and be arranged as a code, such as a QR code.
  • the luminescent pigments are printed as a security feature, for example on a security document. The printing or application can with
  • the phosphor can be applied to the security document by coating methods or lamination methods or introduced into the security document.
  • the particle size distribution of the luminescent pigments is preferably adapted to the respective printing and application method.
  • the security feature in particular the phosphor, preferably has a high processing stability.
  • the phosphor has a high thermal and mechanical stability.
  • the phosphor preferably has a high aging resistance to environmental influences. Stability and aging resistance are required to ensure secure verifiability of the security feature throughout the lifecycle of the security document.
  • Luminescence characteristics of the phosphor can be excited by means of a smartphone flash light and its emission can be detected by the smartphone camera, resulting in a simple, fast and user-friendly verification of the security feature.
  • An authenticity check and / or integrity check can be carried out. It has proven to be advantageous to select for the provision of the security feature a special phosphor with cooldowns in the ms range, the luminescence signals are still safe to measure even after completion of the excitation process.
  • the verification advantageously does not exclusively refer to the proof of the presence of the security feature; it also includes the emissions as authenticity criteria
  • Another advantage of the security feature is that it can not be visually perceived by humans.
  • the arrangement according to the invention comprises a security feature according to the invention in one of the previously described
  • the arrangement comprises a smartphone, which comprises a lighting unit, an image acquisition unit and a data processing unit.
  • an advantageous approach to be able to reliably measure the decaying luminescence of the phosphors after completion of the excitation processes is to use as a detection method, a combination of single flash and serial or video recordings, the duration of the series or Video recordings of the
  • the recording time is based on the cooldown of the
  • the emission intensity of the phosphor should be zero as it was before flashlamp excitation. Then, this frame can be used as a reference for calculating the image differences (Bi-R; B 2 -R;... B n -R).
  • the analysis of the image differences, the contrast adjustment to be made and the consideration and inclusion of further image analysis methods can be regarded as an essential prerequisite for detecting, with the help of the smartphone, not only the presence of a selected inventive phosphor, but at the same time as well to verify the spectral emission and the exclusive decay characteristic.
  • the device and the security document are chosen to be less than the shaft adjustment range of the smartphone; for the exception and verification of the diffuse luminescence signals no sharp images are needed.
  • the smartphone must be configured with an app in such a way that at least the following steps are carried out for the verification of the security feature:
  • the security feature is excited by means of the illumination unit of the smartphone, preferably by triggering a single flash of the LED flash module for luminescence, so that the security feature emits an electromagnetic radiation in the visible spectral range.
  • the decaying luminescence signals of the phosphor of the security feature according to the invention which occur after termination of the excitation, are detected parallel to the individual lightning excitation by means of the image acquisition unit, that is to say with the aid of the camera module of the smartphone.
  • the luminescence characteristics in the captured images are evaluated by means of the data processing unit and with reference data
  • FIG. 1 shows a schematic representation of an embodiment of a security feature according to the invention on a security document in the form of a banknote
  • Fig. 2 is a schematic representation of components of an inventive arrangement for verification of
  • Fig. 3 is a schematic representation of the arrival and Abkling behavior of a phosphor of the security feature in flash excitation
  • Fig. 6 is an emission spectrum of excited at 450 nm
  • Fig. 8 shows a color shift over the entire visible
  • FIG. 9 shows emission spectra of the stationary photoluminescence of the phosphors excited at 450 nm in accordance with FIG. 9
  • the security feature 01 shows a security feature 01 according to the invention, which symbolizes on a value document, namely one shown security document 02 is applied in the form of a banknote.
  • the security feature is the authenticity proof of the security document 02.
  • the security feature 01 here has a star shape. It is positioned below a visible feature 03, in this case the face value of the banknote.
  • the security feature 01 consists of a means of the illumination unit of a smartphone before preferably in the blue spectral range in the ms range
  • Fig. 2 shows a schematic representation of an arrangement for verifying the security feature 01, wherein the safety feature by means of a lighting unit 04 of an image pickup unit 06 of a mobile terminal, namely a smartphone 07, is excited to luminescence by the
  • Lighting unit 04 excitation light, in particular white LED flash 08 produced with a spectral maximum of about 450 nm.
  • the flash 08 has an intensity I A.
  • the phosphor of the security feature 01 emits a stationary electromagnetic radiation in the visible spectral range, which decays in the ms range after the end of the excitation.
  • the decaying emission I E of the phosphor is detected by a camera 09 of the image acquisition unit 06 of the smart phone 07 by triggering a serial or video recording.
  • the camera 09 operating as a detector detects an ambient radiation Io of the daylight or room light impinging on the security feature 01 and the banknote 02 and reflected there.
  • the influence of the ambient radiation Io can be kept low in the inventive method, that a distance d between the security feature 01 and the smartphone 07 is kept low. Due to the small distance d, which is preferably below the focal point Area of the image pickup unit 06 is located, the smartphone 07 shields the ambient radiation Io largely from. For the reliable verification of the diffuse luminescence signals of the security feature namely no sharp Jardinauf are needed.
  • Fig. 3 shows a schematic representation of the arrival
  • the diagram shows an emission curve 11 of the luminescence-stimulated security feature 01 along a time axis t. Furthermore, a flashlamp excitation curve 12 is plotted along the time axis.
  • the LED flash excitation curve 12 steeply rises, holds its level for a short time, and then drops to zero in the ns to ys range.
  • the emission curve 11 increases almost simultaneously with the flash light excitation curve 12. The emission of the phosphor 11 sounds after completion of the
  • Flash excitation 12 much slower than the exciting radiation of preferably with white emitting LED
  • the decay time of the phosphor is according to the invention in the ms- range.
  • FIG. 2 Below the time axis, individual images 13 of the security feature 01 captured by the detector 09 of the smartphone 07 (FIG. 2) are shown in FIG.
  • the image recordings 13 show the decaying emission intensity of the security feature 01 on the basis of the decreasing with time Hellig speed of the example used star pattern.
  • a reference image 14b After substantially complete decay of the emission of the luminous Stoffes can be detected as the last image of the recorded image sequence, a reference image 14b.
  • an additional reference image 14a start image can also be recorded before the activation of the excitation radiation (triggering of the flash).
  • a starting image 14a may already be available as an additional reference image prior to triggering the series or video recordings which are decisive for the detection of the decaying luminescence signals of the security feature
  • FIG. 4 shows in a simplified form the basic sequence of the verification of the security feature 01 using the arrangement shown in FIG. 3.
  • Positioning step 41 the secure document to be verified is positioned so that it can be reliably detected by the image capture unit of the smartphone.
  • the start image 14a of the security feature is generated even before the triggering of the flashlight excitation of the smartphone.
  • a detection step 43 with the aid of the image recording unit
  • the recorded image series and the reference images are compared by means of the data processing unit.
  • other methods of image processing such as for example the contrast adjustment and the histogram analysis the different color channels used in order in this way both the spectral emission and the exclusive decay characteristics of the invention
  • the used phosphor to verify By comparing the calculated parameters with the authenticity parameters of the security feature preferably stored in the data memory of the smartphone, the authenticity of the checked security document can be confirmed in a release step 45.
  • verification of the security feature on the security document can provide authenticity and security
  • Fig. 5 shows an excitation spectrum 121 of the 700 nm emission band of a phosphor according to embodiment 1.
  • this phosphor are 0.2822 g CaCCb, 0.5335 g SC2 (C2O4) 3 ⁇ 10, 723H 2 0, 0.1803 g SiC > 2, 0.0052 g Ce0 2 , and 0.0358 g MnC 2 04 -2H 2 0 completely homogenized by mortars with the addition of acetone. After evaporation of the solvent, the dry powder mixture is transferred to a corundum crucible.
  • the sample is first precalcined in a box furnace at 500 ° C for 2 h in an air atmosphere and then annealed in a furnace at 1400 ° C for 4 h in 5% H 2 /95% N 2 atmosphere. The resulting product is then sieved. This
  • Phosphorus has the formula (Ca 2, 82Ceo, 03Mn 0 , 15) (Se, 95 Mn 0, 05) S13O12.
  • the excitation spectrum makes it clear that the exemplary inventive phosphor has a maximum spectral excitability in the range from 440 to 450 nm.
  • FIG. 6 shows a corresponding emission spectrum 111 of the phosphor according to exemplary embodiment 1 at 450 nm excitation. It turns out that the above about the phosphor Z composition and the selected preparation conditions specifically
  • these bands can be the direct luminescence of the Ce 3+ activator ions (Ce 3+ on Ca 2+ site), as well as the emission of the Mn 2 positioned on the different lattice sites via the Ce 3+ - Mn 2+ energy transfer +
  • Fig. 7 shows the spectral decay curves of the individual
  • the curve 1311 is the decay curve for the
  • curve 1312 is the decay curve for the
  • curve 1313 is the decay curve for the 700 nm emission. It can be clearly seen that the spectral decay curves for the individual emissions
  • Figure 8 illustrates the color shift resulting when the evanescent luminescence is visible throughout
  • FIG. 8 initially shows a schematic representation of a CIE standard color block 15 of the CIE standard valence system.
  • the CIE standard system was 1931 defines a relationship between human color perception and the physical causes of the color stimulus, and typically captures the entirety of all perceptible colors, with color perception being that of a defined normal observer. Any color or any emission spectrum of a self-illuminator is governed by a single xy coordinate in the CIE standard
  • Phosphor according to embodiment 1 The described special decay behavior contributes to a high degree Exclusivity of Ca3Sc2Si30i2 invention: Ce 3+, Mn 2+ - with phosphor.
  • FIG. 9 shows the emission spectra 1123, 113 of the stationary photoluminescence of the phosphors excited at 450 nm according to embodiments 2 and 3.
  • the liquid is evaporated until the remaining gel ignites and a black foam is formed.
  • This foam is first dried at 150 ° C in a drying oven, then finely ground and transferred to a porcelain crucible. In a first heating step, the mixture is calcined for the purpose of decomposition of remaining organic constituents for 2 h at 1000 ° C in the air atmosphere of a chamber furnace. Subsequently, this is now a white body color
  • the resulting phosphor has the composition (Ca2, 89 sCeo, 03Mn 0 , 075) (Se, 9 75 Mh 0, 025) SZ3O12.
  • the curve 112 in FIG. 9 shows the emission spectrum of this phosphor.
  • the curve 132 denotes the decay curve for this preferably in the green
  • Si 3 0i 2 are 0.2747 g CaCCg, 0.1227 g Sc 2 C> 3, 0.1803 g Si0 2, 0.0130 g of Ce (NO3) 3 ⁇ 6H 2 0, 0.0537 g MnC 2 0 4 -2H 2 0 and 1.8170 g of tris (hydroxymethyl) aminomethane with Stir and heat in a mixture of 10 ml of nitric acid and 100 ml of water. The liquid is then evaporated until the resulting gel ignites. The resulting black foam is dried at 150 ° C in a drying oven, then finely mortared and transferred to a porcelain crucible. After a first
  • Decay curve is the curve 133 of FIG. 10 can be seen.
  • the two exemplary embodiments and the associated figures once again clearly show that the Ca3Sc 2 Si30i 2 : Ce 3+ , Mn 2+ phosphors are a particularly suitable class of phosphors for the formation of a security feature according to the invention.
  • Omposition by varying the fluorescent Z and the preparation conditions can be numerous exclusive phosphor compositions with different decay and distinguishable

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Abstract

L'invention concerne un critère de sécurité (01) vérifiable par ordiphone pourvu d'une substance fluorescente, dont la luminescence peut être provoquée par un rayonnement électromagnétique visible produit par un ordiphone et qui montre après la fin de l'excitation, pendant une durée de décroissance comprise entre 1 ms et 100 ms, une émission, laquelle peut être détectée au moyen d'une unité de détection d'images de l'ordiphone. L'invention concerne en outre un système de vérification d'un document de sécurité (02), lequel comprend un tel critère de sécurité (01).
PCT/EP2019/059709 2018-04-17 2019-04-15 Critère de sécurité à base de substance fluorescente vérifiable par ordiphone et système de vérification WO2019201877A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES19722000T ES2940565T3 (es) 2018-04-17 2019-04-15 Característica de seguridad basada en sustancias luminiscentes, verificable por teléfono inteligente y disposición para la verificación
EP19722000.7A EP3781408B1 (fr) 2018-04-17 2019-04-15 Critère de sécurité à base de substance fluorescente vérifiable par ordiphone et système de vérification
CN201980025993.9A CN112203863B (zh) 2018-04-17 2019-04-15 能经智能电话验证的、基于发光材质的安全特征和用于验证的设施
PL19722000.7T PL3781408T3 (pl) 2018-04-17 2019-04-15 Dająca się weryfikować za pomocą smartfona, oparta na luminoforze cecha zabezpieczająca i układ do weryfikacji

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018109141.9 2018-04-17
DE102018109141.9A DE102018109141A1 (de) 2018-04-17 2018-04-17 Smartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur VerifizierungSmartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur Verifizierung

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WO2019201877A1 true WO2019201877A1 (fr) 2019-10-24

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DE102018109141A1 (de) 2019-10-17
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