CN101398950A - Method for appraising document of value - Google Patents
Method for appraising document of value Download PDFInfo
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- CN101398950A CN101398950A CNA2007101547006A CN200710154700A CN101398950A CN 101398950 A CN101398950 A CN 101398950A CN A2007101547006 A CNA2007101547006 A CN A2007101547006A CN 200710154700 A CN200710154700 A CN 200710154700A CN 101398950 A CN101398950 A CN 101398950A
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Images
Landscapes
- Credit Cards Or The Like (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
The invention relates to the anti-fake technical field of default free securities such as paper currencies, certificates, magnetic cards and the like, and discloses a method for identifying the truth and false of a valuable security. The method comprises the following steps: an AC electric field or electron source the energy and frequency of which are higher than a threshold value is used for irradiating a mark zone of a valuable security; emission of narrowband-like laser of at least a wavelength is detected from the valuable security along with response of the AC electric field or the electron source to the irradiation to prove that the valuable security is true. The invention simultaneously discloses a valuable security which comprises a carrier which forms a plane substrate and at least a security structure which is printed or embedded in the surface of the carrier; the security structure at least comprises a resonant cavity which is composed of an electroluminescent pigment and a feedback element; the resonant cavity can respond to the irradiation of the AC electric field or the electron source the energy and the frequency of which are higher than the threshold value to produce the emission of the narrowband-like laser of the at least one wavelength. By the method, the true and false identification of the valuable security is achieved by the electroluminescent pigment.
Description
Technical Field
The invention relates to the anti-counterfeiting technical field of security documents such as bank notes, certificates, magnetic cards and the like, in particular to a method for identifying the authenticity of the security documents and the security documents with anti-counterfeiting characteristics.
Background
In the electroluminescent laser described in patent US4081763, the feedback mechanism is a fabry-perot resonator, and when the insulating layer is ZnS: mn, the device can be stimulated to emit when the voltage is higher than 60V at audio frequency. However, the use of this method for banknotes, securities and paper is limited. Because the preparation performance is excellent and stable, the medium reflecting film suitable for circulation needs a vacuum chamber, the manufacturing cost is expensive, and the manufacture is relatively troublesome.
An optically based method and apparatus for ticket authentication is described in patent CN 1163848. Wherein illumination of at least a portion of a document with a laser above a threshold energy density is described, and detection of a narrow band like laser emission of at least one wavelength from the document is described. However, above a certain threshold energy, a generally inexpensive pulsed laser can only reach the threshold energy required for excitation when irradiating a relatively small area. Thus, the spatially encoded narrow band spectrum cannot be efficiently detected. In addition, as described in document j.opt.soc.am.b.vol.21, 214(2004), in order to reduce the threshold required for narrow-band emission, it is necessary to increase the quality factor of the microcavity, which would likely result in the microcavity being a photon forbidden band for the wavelength of the excitation light source, so that the excitation light fails to excite the luminescence center. Moreover, because the optical pump is influenced by light scattering, energy is easily scattered to the periphery by particles and cannot be sufficiently absorbed by the luminescent pigment, so that the difficulty of realizing narrow-band emission is increased. These factors are all relatively difficult to overcome by optical pumping.
The application of electroluminescent technology to the field of forgery prevention, in particular to securities, is described in patent CN1105654, entitled "value and security products with luminescent elements", which is applied to documents of value, such as: banknotes, checks, and other negotiable instruments, and the like. The method utilizes a relatively common electroluminescent technology that is a broad spectrum emission, unlike the narrow band similar laser emission of the present invention.
With the need of machine-reading banknotes, in particular banknotes of different denominations, are coded for the purpose of sorting and counting. One problem that arises in the conventional use of electroluminescence is the saturation behavior of the light output, which affects the signal-to-noise ratio of the detected signal, making it easy to make a false decision when applying this way to achieve coding.
In response to the above problems, the output behavior has both non-saturating and substantially non-saturating behavior by providing a certain feedback mechanism before electroluminescence is emitted from the value document to achieve narrow band emission of the laser-like light. And the width of the spectral line has great influence on the accuracy and the number of codes, so the narrow-band spectrum of the laser-like light can be more accurately coded and detected.
The electric field is not influenced by material scattering, so that the luminescent pigment can be easily excited, and compared with light excitation, the excitation light is difficult to act on the luminescent pigment due to scattering, the electric field excitation is not influenced by light scattering, is not influenced by local photon forbidden bands, and can directly act on the luminescent pigment, so that the method is more flexible and is less limited. Moreover, the electric field excitation method can simultaneously excite a large area, thereby detecting the code at one time.
Disclosure of Invention
Technical problem to be solved
In view of the above, an object of the present invention is to provide a method for authenticating valuable documents, so as to implement the authentication of valuable documents by using electroluminescence, and make the authentication of valuable documents simpler, more accurate and easier to implement.
Another object of the present invention is to provide a security document with an anti-counterfeit feature, so as to realize the authenticity identification of the security document by using electroluminescence, and the authenticity identification of the security document is simpler, more accurate and easier to realize.
(II) technical scheme
To achieve the above object, the present invention provides a method for authenticating a valuable document, the method comprising:
irradiating a marking area of the valuable document with an alternating electric field or an electron source having an energy and a frequency higher than a threshold value;
with response to irradiation of an alternating-current electric field or an electron source, emission of a narrow-band laser-like light of at least one wavelength is detected from the valuable paper, and the valuable paper is proved to be genuine.
In the above solution, the step of illuminating the indicia area of the value document comprises: illuminating at least one security structure comprised in the marking area of the value document with an alternating electric field or electron source having an energy and a frequency above a threshold value, the security structure comprising at least one resonant cavity formed by an electroluminescent pigment and a feedback element.
In the scheme, the electroluminescent pigment is laid on a carrier of the valuable paper in a coded form and comprises an electric field excited luminescent pigment and an electron source excited luminescent pigment;
the feedback element is a scattering particle, an optical multilayer film, a metal film, and a particle formed of the optical multilayer film or the metal film.
In the above scheme, the particle size of the electroluminescent pigment is 1 nm to 30 microns, preferably 1 nm to 100 nm, the electric field excited luminescent pigment comprises one or any combination of doped II-IV group compounds ZnS, ZnSe, SrS, CaS or CdS, and the electron source excited luminescent pigment comprises rare earth doped oxide Nd: Al2O3Or Yb: Y2O3One or any combination thereof;
the scattering particles comprise an oxide SiO2、Al2O3、TiO2Or BaIiO3Or particles of metal Ag, Au or Cu, wherein the oxide particles are SiO2、Al2O3、TiO2Or BaIiO3Has a particle size of 10 nm to 10 μm, preferably 50 nm to 1 μm, and the metal particles Ag, Au or Cu have a particle size of 1 nm to 5 μm, preferably 1 nm to 100 nm;
the optical multilayer film is an optical multilayer film with high refractive index and low refractive index which are alternately changed;
the metal film is a metal Au, Ag, Cu and Al film or an alloy film.
In the above scheme, the dopant in the doped II-IV compound ZnS, ZnSe, SrS, CaS or CdS includes one or any combination of Cu, Au and Mn as an activator, and includes halide ions or trivalent cations as an activator.
In the above scheme, the electroluminescent pigment is further coated with a layer of transparent material for allowing the electroluminescent light to effectively enter the electroluminescent pigment without being reflected and scattered.
In the above scheme, the transparent material layer covering the electroluminescent pigment is prepared by chemical vapor deposition CVD or physical chemical vapor deposition PCVD, the optical path of the transparent material layer is half of the narrow-band wavelength, and the refractive index of the transparent material layer is the square root of the product of the refractive index of the electroluminescent pigment and the refractive index of the surrounding ink.
In the scheme, the securities are banknotes, certificates, magnetic cards or security securities for preventing counterfeiting, and the carrier is composed of paper, plastic and a composite plastic layer;
the narrow-band laser-like emission is spatially distributed in a coded form;
the electroluminescent pigment and the feedback element which form the resonant cavity are mixed in the same printing ink and are printed in the same printing ink layer on the surface of the carrier by screen printing, engraving or intaglio printing, offset printing or relief offset printing; or
The electroluminescent pigment and the feedback element which form the resonant cavity are mixed in different printing inks and are alternately printed in different printing ink layers on the surface of the carrier by adopting screen printing, engraving or intaglio printing, offset printing or letterpress offset printing.
To achieve another object, the present invention provides a value document comprising:
a carrier constituting a planar substrate, and
at least one security structure printed or embedded on the surface of said support, the security structure comprising at least one resonant cavity formed by an electroluminescent pigment and a feedback element, the resonant cavity being capable of generating a narrow band laser-like emission of at least one wavelength in response to irradiation by an alternating electric field or electron source having an energy and frequency above a threshold value.
In the scheme, the electroluminescent pigment is laid on a carrier of the valuable paper in a coded form and comprises an electric field excited luminescent pigment and an electron source excited luminescent pigment;
the feedback element is a scattering particle, an optical multilayer film, a metal film, and a particle formed of the optical multilayer film or the metal film.
In the above scheme, the particle size of the electroluminescent pigment is 1 nm to 30 microns, preferably 1 nm to 100 nm, the electric field excited luminescent pigment comprises one or any combination of doped II-IV group compounds ZnS, ZnSe, SrS, CaS or CdS, and the electron source excited luminescent pigment comprises rare earth doped oxide Nd: Al2O3Or Yb: Y2O3One or any combination thereof;
the scattering particles comprise an oxide Al2O3、TiO2Or BaIiO3Or particles of a metal Ag, Au or Cu, wherein the oxide particles Al2O3、TiO2Or BaIiO3Has a particle size of 10 nm to 10 μm, preferably 50 nm to 1 μm, and the metal particles Ag, Au or Cu have a particle size of 1 nm to 5 μm, preferably 1 nm to 100 nm;
the optical multilayer film is an optical multilayer film with high refractive index and low refractive index which are alternately changed;
the metal film is a metal Au, Ag, Cu and Al film or an alloy film.
In the above scheme, the dopant in the doped II-IV compound ZnS, ZnSe, SrS, CaS or CdS includes one or any combination of Cu, Au and Mn as an activator, and includes halide ions or trivalent cations as an activator.
In the above scheme, the electroluminescent pigment is further coated with a layer of transparent material for allowing the electroluminescent light to effectively enter the electroluminescent pigment without being reflected and scattered.
In the above scheme, the transparent material layer covering the electroluminescent pigment is prepared by chemical vapor deposition CVD or physical chemical vapor deposition PCVD, the optical path of the transparent material layer is half of the narrow-band wavelength, and the refractive index of the transparent material layer is the square root of the product of the refractive index of the electroluminescent pigment and the refractive index of the surrounding ink.
In the scheme, the securities are banknotes, certificates, magnetic cards or security securities for preventing counterfeiting, and the carrier is composed of paper, plastic and a composite plastic layer;
the narrow-band laser-like emission is spatially distributed in a coded form;
the electroluminescent pigment and the feedback element which form the resonant cavity are mixed in the same printing ink and are printed in the same printing ink layer on the surface of the carrier by screen printing, engraving or intaglio printing, offset printing or relief offset printing; or
The electroluminescent pigment and the feedback element which form the resonant cavity are mixed in different printing inks and are alternately printed in different printing ink layers on the surface of the carrier by adopting screen printing, engraving or intaglio printing, offset printing or letterpress offset printing.
(III) advantageous effects
According to the technical scheme, the invention has the following beneficial effects:
1. by using the invention, at least one safety structure is printed or embedded on the surface of the carrier of the valuable documents, the safety structure at least comprises a resonant cavity formed by electroluminescent pigment and a feedback element, the resonant cavity can respond to the irradiation of an alternating current electric field or an electron source with energy and frequency higher than a threshold value, and the emission of narrow-band similar laser with at least one wavelength is generated, so that the authenticity of the valuable documents is identified by using electroluminescence, and the authenticity of the valuable documents is identified more simply, accurately and easily.
2. The invention provides an improved method for verifying valuable documents based on electroluminescence and valuable documents with anti-counterfeiting characteristics, which can realize that an alternating current electric field or an electron source with energy and frequency higher than a certain threshold value is used for deenergizing a mark area, and the emission of narrow-band laser-like light with at least one wavelength of code distribution is detected from the valuable documents at one time along with the response to the electric field, and the code distribution is obtained without scanning a carrier point by point or line by line.
3. The electric field is not influenced by material scattering, so that the luminescent pigment can be easily excited, and compared with light excitation, the light scattering causes that excitation light is difficult to act on the luminescent pigment, and the electric field excitation is not influenced by the light scattering, is not influenced by local photon forbidden bands and can directly act on the luminescent pigment, so that the luminescent pigment is more flexible and is less limited.
Drawings
FIG. 1 is a flow chart of a method for authenticating documents of value provided by the present invention;
FIG. 2 is a top plan view of a document of value having a security feature provided in accordance with the present invention; the valuable paper comprises a mark area, and when an alternating current electric field or an electron source with energy and frequency higher than a certain threshold value excites the mark area of the valuable paper, the mark area can emit narrow-band laser-like emission with one or more characteristic wavelengths of code distribution;
FIG. 3 is an enlarged top view of a bar code within the marking area of FIG. 1;
FIG. 4 is an enlarged cross-sectional view of a bar code within the indicia area of FIG. 3;
FIG. 5 is an enlarged cross-sectional view of a bar code corresponding to the indicia area of another embodiment of the value document shown in FIG. 2;
FIG. 6 is a plot of the electroluminescence spectrum excited in the indicated region at different voltages/frequencies; curve 8 represents the electroluminescence spectrum with a voltage (frequency) below the threshold value, and curve 9 represents the electroluminescence spectrum with a voltage (frequency) above the threshold value; wherein,
1 securities
2 support
3 safety structure of bar mode code
A bar code in the 4 bar code
5 electroluminescent pigments
6 feedback element
Marking layer comprising electroluminescent pigments and feedback elements
Electroluminescent spectra with 8 volts below threshold
9 electroluminescent laser narrow-band spectrum with voltage higher than threshold
10 marking layer containing electroluminescent pigment according to another embodiment
11 marking layer with feedback element according to another embodiment
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The core content of the invention is as follows: a valuable document having an anti-counterfeit feature is provided, a mark area of the valuable document is irradiated with an alternating current electric field or an electron source having energy and frequency higher than a threshold value, and emission of a narrow band laser-like light of at least one wavelength is detected from the valuable document in response to the irradiation of the alternating current electric field or the electron source, and the valuable document is declared to be genuine.
The invention is based on the following idea: according to the electroluminescent laser described in US4081763, the structure requires a fabry-perot resonator, and the actual fabrication of such a resonator is not very easy, especially not adapted to the requirements of printing anti-counterfeiting. Narrow-band laser emission is achieved by adding scattering media to form a resonant cavity as described in patent CN 1163848. Thus, in the case of electroluminescence, if a resonator formed of a scattering medium is used instead of the fabry-perot resonator, the emission of electroluminescent narrow-band laser-like light can also be achieved. In this way, complex optical films with alternating refractive indexes do not need to be prepared, and only scattering particles for providing feedback need to be added into the electroluminescent pigment, so that the realization process is much simpler and meets the requirement of printing anti-counterfeiting.
To achieve the conditions for narrow band electroluminescent-like laser emission, it is necessary to combine the appropriate choice of electroluminescent pigments with the feedback element to form localized microcavities, i.e. resonant cavities. The electroluminescent pigments are present microscopically in the form of particles, which may also be referred to as electroluminescent particles. The feedback element may generally be scattering particles, optical multilayer films, metal films, and particles formed of optical multilayer films or metal films.
In order to lower the threshold for achieving narrow band-like laser emission, it is necessary to satisfy a mode required for excitation, to raise the quality factor of the cavity as much as possible, and to distribute the mode field within the electroluminescent pigment particles as much as possible. Therefore, the scattering particles forming the feedback element are preferably made of a material having a relatively large refractive index and a suitable particle size to ensure a strong scattering effect on electroluminescence. Meanwhile, the refractive index of the electroluminescent particles is larger than that of the surrounding medium, so that reflection and scattering in the interface are also large, and the electroluminescent pigment can be coated with a transparent material with a proper thickness to ensure that the light emitted by the electroluminescence can effectively enter the electroluminescent pigment without being reflected and scattered in a large amount. Thus, the optical path length of the layer of electroluminescent particles is approximately half the wavelength of the narrow band, and the refractive index is preferably the square root of the product of the refractive index of the electroluminescent particles and the refractive index of the surrounding ink.
In order to realize the electroluminescence of the laser-like light by a relatively tiny external electric field, a field shift element with proper design can be added to realize the extrusion or the field shift of the electric field and enhance the electric field intensity near the field shift element. The field shift element can also be replaced by a feedback element, and metal particles such as high dielectric materials or metal particles Ag, Au, Cu and the like just meet the strong scattering and field shift effects. For ZnS: Mn with higher electroluminescent efficiency, the emission wavelength is 520 nanometers, the size of the selected high dielectric material is preferably hundreds of nanometers, and is preferably about 300 nanometers, so that a stronger scattering effect on electroluminescence is ensured; the size of the metal particles selected is preferably from 1 nm to 100 nm, preferably around 60 nm.
As shown in fig. 1, fig. 1 is a flow chart of a method for authenticating a value document according to the present invention, the method comprising the steps of:
step 101: irradiating a marking area of the valuable document with an alternating electric field or an electron source having an energy and a frequency higher than a threshold value;
step 102: with response to irradiation of an alternating electric field or an electron source, emission of a narrow band laser-like light of at least one wavelength is detected from the valuable paper, and the valuable paper is declared genuine.
The irradiating the value document mark area in step 101 above comprises: illuminating at least one security structure comprised in the marking area of the value document with an alternating electric field or electron source having an energy and a frequency above a threshold value, the security structure comprising at least one resonant cavity formed by an electroluminescent pigment and a feedback element.
The electroluminescent pigments are applied in coded form on a support for value documents and comprise an electrically excited luminescent pigment and an electron source excited luminescent pigment. The feedback element is a scattering particle, an optical multilayer film, a metal film, and a particle formed of the optical multilayer film or the metal film.
The electroluminescent pigment has a particle size of 0.2-10 μm, and the electric field excited luminescent pigment comprises doped II-IV group compoundOne or any combination of ZnS, ZnSe, SrS, CaS or CdS, and the luminescent pigment excited by the electron source comprises rare earth doped oxide Nd: Al2O3 or Yb: Y2O3One or any combination thereof. The scattering particles comprise an oxide Al2O3、TiO2Or BaIiO3Or particles of a metal Ag, Au or Cu, wherein the oxide particles Al2O3、TiO2Or BaIiO3Has a particle diameter of 50 nm to 1 μm, and the metal particles Ag, Au or Cu have a particle diameter of 1 nm to 100 nm. The optical multilayer film is an optical multilayer film with high refractive index and low refractive index which are alternately changed. The metal film is a metal Au, Ag, Cu and Al film or an alloy film.
The doping material in the doped II-IV group compound ZnS, ZnSe, SrS, CaS or CdS comprises one or any combination of Cu, Au and Mn as an activating agent, and comprises halide ions or trivalent cations as the activating agent.
The electroluminescent pigment is further coated with a layer of transparent material for enabling the electroluminescent light to effectively enter the electroluminescent pigment without being reflected and scattered.
The transparent material layer coated with the electroluminescent pigment is prepared by adopting a chemical vapor deposition method CVD or a physical chemical vapor deposition method PCVD, the optical path of the transparent material layer is half of the narrow-band wavelength, and the refractive index of the transparent material layer is the square root of the product of the refractive index of the electroluminescent pigment and the refractive index of the surrounding ink. In practical applications, the transparent material layer may also be designed with other antireflection coating layers.
The above securities are bank notes, certificates, magnetic cards or security securities for preventing counterfeiting, and the carrier is composed of paper, plastic and composite plastic layers. The narrow-band laser-like emission is spatially distributed in a coded fashion. The electroluminescent pigment and the feedback element which form the resonant cavity are mixed in the same printing ink and are printed in the same printing ink layer on the surface of the carrier by screen printing, engraving or intaglio printing, offset printing or relief offset printing; or the electroluminescent pigment forming the resonant cavity and the feedback element are mixed in different printing inks and are alternately printed in different printing ink layers on the surface of the carrier by adopting screen printing, engraving or intaglio printing, offset printing or letterpress offset printing.
The marking area is de-excited by an alternating electric field or electron source with an energy and frequency above a certain threshold value, and a narrow-band laser-like emission of at least one wavelength of the encoded distribution is detected from within the value document in response to the electric field. Only when the similar laser emission of the code is detected after the excitation of the electric field, the valuable paper is the genuine product.
FIG. 2 is a top view of a document of value having a security feature provided by the present invention, as shown in FIG. 2. The value document includes a marking area which emits a narrow-band laser-like emission of one or more characteristic wavelengths of the encoded distribution when an alternating electric field or electron source at an energy and frequency above a certain threshold value excites the marking area of the value document.
The invention shown in FIG. 2 provides a value document having a security feature comprising: a support 2 constituting a planar substrate, and at least one security structure 3 printed or embedded in the surface of said support, the security structure 3 comprising at least one resonant cavity constituted by an electroluminescent pigment and a feedback element, the resonant cavity being capable of generating a narrow-band laser-like emission of at least one wavelength in response to irradiation by an alternating electric field or electron source having an energy and frequency above a threshold value.
The electroluminescent pigments are applied in coded form on a support for value documents and comprise an electrically excited luminescent pigment and an electron source excited luminescent pigment. The particle size of the electroluminescent pigment is between 1 nanometer and 30 micrometers, preferably between 1 nanometer and 100 nanometers, the electric field excited luminescent pigment comprises one or any combination of doped II-IV group compounds ZnS, ZnSe, SrS, CaS or CdS, and the electron source excited luminescent pigment comprises rare earth doped oxide Nd: Al2O3Or Yb: Y2O3One or any combination thereof. The doped II-IV group compounds ZnS, ZnSe, SrS, CaThe doping material in S or CdS is used as an activator and comprises one or any combination of Cu, Au and Mn, and the activator comprises halide ions or trivalent cations.
The electroluminescent pigment is further coated with a layer of transparent material for enabling the electroluminescent light to effectively enter the electroluminescent pigment without being reflected and scattered. The transparent material layer coated with the electroluminescent pigment is prepared by adopting a Chemical Vapor Deposition (CVD) method or a Physical Chemical Vapor Deposition (PCVD) method, the optical path of the transparent material layer is half of the narrow-band wavelength, and the refractive index of the transparent material layer is the square root of the product of the refractive index of the electroluminescent pigment and the refractive index of surrounding ink. In practical applications, the transparent material layer may also be designed with other antireflection coating layers.
The feedback element is a scattering particle, an optical multilayer film, a metal film, and a particle formed of the optical multilayer film or the metal film. The scattering particles comprise an oxide Al2O3、TiO2Or BaIiO3Or particles of a metal Ag, Au or Cu, wherein the oxide particles Al2O3、TiO2Or BaIiO3Has a particle size of between 10 nm and 10 microns, preferably 50 nm to 1 micron, and has a particle size of between 1 nm and 5 microns, preferably 1 nm to 100 nm; the optical multilayer film is an optical multilayer film with high refractive index and low refractive index which are alternately changed; the metal film is a metal Au, Ag, Cu and Al film or an alloy film.
The above securities are bank notes, certificates, magnetic cards or security securities for preventing counterfeiting, and the carrier is composed of paper, plastic and composite plastic layers. The narrow-band laser-like emission is spatially distributed in a coded fashion.
The electroluminescent pigment and the feedback element which form the resonant cavity can be mixed in the same printing ink and printed in the same printing ink layer on the surface of the carrier by adopting screen printing, engraving or intaglio printing, offset printing or relief offset printing; or
The electroluminescent pigment and the feedback element constituting the resonant cavity may also be mixed in different inks, alternately printed in different ink layers on the surface of the support by screen printing, engraving or gravure printing, offset printing or letterpress offset printing.
Referring again to FIG. 2, FIG. 2 is a top view of a document of value having a security feature provided by the present invention. The value document 1 is a banknote, a document, a magnetic card or any other security document that is protected against forgery and comprises a carrier 2 as a base element, which can be made of paper, plastic, a laminated plastic layer or another suitably selected material. A security structure 3 is arranged in an area on the carrier 2, the security element is in a bar code mode, and any bar code 4 in the laid bar code comprises electroluminescent pigment 5 and a feedback element 6. In order to verify and analyze the security element 3, provision is made for an alternating electric field to be applied to the security element 3 by a suitably selected checking device. The pigment 5 emits light under the action of an alternating current electric field, and with the continuous rise of voltage and the continuous increase of frequency, when a certain threshold value is exceeded, the emitted electroluminescence is a narrow-band laser spectrum. The effect of the alternating electric field can be in a large spatial range, so that the encoding mode on the security element can be effectively detected at one time.
FIG. 4 is a cross-sectional view of an arbitrary bar code 4, a first embodiment of a document of value provided with a security feature according to the invention. The feedback element 6 and the electroluminescent pigment 5 are formulated as an ink which is applied to the carrier 2 by means of printing, in particular gravure printing or screen printing. The electroluminescent pigment particles are of such a size that ZnS doped with Mn or/and Cu or/and other halogen elements and rare earth elements having a particle size of between 1 nm and 30 μm, preferably between 1 nm and 100 nm. The scattering particles comprise Al having a particle size of between 10 nm and 10 microns, preferably between 50 nm and 1 micron2O3，TiO2，BaTiO3And metal particles of Ag, Au, Cu, etc. with a particle size of 1 nm to 5 μm, preferably 1 nm to 100 nm. Most preferably about 200 nm of BaTiO3 particles or about 60 nm of metal particles.
FIG. 5 is another embodiment of a document of value having a security feature provided by the present invention. The feedback element 6 is applied to the surface of the carrier 2, for example, if the carrier is paper, the feedback element 6 may be applied to the carrier by papermaking, then the marking layer 10 containing the electroluminescent pigment is applied by printing to the surface of the carrier 2, and then the other marking layer 11 containing the feedback element 6 is applied by printing. Instead of applying the marking layer 11 comprising the feedback element 6, the marking layer 10 comprising only the electroluminescent pigment 5 can be replaced by the marking layer 7 comprising the electroluminescent pigment 5 and the feedback element 6 in fig. 4. The carrier 2, here also the feedback element 6, can enhance the feedback to the electroluminescence, thereby lowering the voltage or frequency threshold required for the electroluminescence narrow band type laser spectrum.
Fig. 6 is a graph of the electroluminescence spectrum excited in the marked region at different voltages/frequencies, where curve 8 shows the electroluminescence spectrum at voltages or/and frequencies below the threshold with a spectral width of tens or tens of nanometers, and curve 9 shows the electroluminescence spectrum at voltages and frequencies above the threshold with a spectral width of a few nanometers.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A method for authenticating a document of value, the method comprising:
irradiating a marking area of the valuable document with an alternating electric field or an electron source having an energy and a frequency higher than a threshold value;
with response to irradiation of an alternating-current electric field or an electron source, emission of a narrow-band laser-like light of at least one wavelength is detected from the valuable paper, and the valuable paper is proved to be genuine.
2. A method for authenticating value documents according to claim 1, characterized in that the step of illuminating a value document marking area comprises:
illuminating at least one security structure comprised in the marking area of the value document with an alternating electric field or electron source having an energy and a frequency above a threshold value, the security structure comprising at least one resonant cavity formed by an electroluminescent pigment and a feedback element.
3. The method for authenticating a document of value according to claim 2,
the electroluminescent pigment is laid on a carrier of the valuable paper in a coded form and comprises an electric field excited luminescent pigment and an electron source excited luminescent pigment;
the feedback element is a scattering particle, an optical multilayer film, a metal film, and a particle formed of the optical multilayer film or the metal film.
4. The method for authenticating a document of value according to claim 3,
the particle size of the electroluminescent pigment is 1 nanometer to 30 micrometers, the electric field excited luminescent pigment comprises one or any combination of doped II-IV group compounds ZnS, ZnSe, SrS, CaS or CdS, and the electron source excited luminescent pigment comprises rare earth doped oxide Nd, Al2O3Or Yb: Y2O3One or any combination thereof;
the scattering particles comprise an oxide SiO2、Al2O3、TiO2Or BaIiO3Or particles of metal Ag, Au or Cu, wherein the oxide particles are SiO2、Al2O3、TiO2Or BaIiO3The grain diameter of the metal grains Ag, Au or Cu is between 1 nanometer and 5 micrometers;
the optical multilayer film is an optical multilayer film with high refractive index and low refractive index which are alternately changed;
the metal film is a metal Au, Ag, Cu and Al film or an alloy film.
5. The method for authenticating securities according to claim 4, characterized in that the doping element of the doped group II-IV compounds ZnS, ZnSe, SrS, CaS or CdS as an activator comprises one or any combination of Cu, Au, Mn as an activator element and also comprises a halide ion or a trivalent cation;
the grain diameter of the electroluminescent pigment is 1 to 100 nanometers, and the oxide particles are SiO2、Al2O3、TiO2Or BaIiO3Has a particle diameter of 50 nm to 1 μm, and the metal particles Ag, Au or Cu have a particle diameter of 1 nm to 100 nm.
6. The method for authenticating securities according to claim 2, wherein the electroluminescent pigment is further coated with a transparent material for allowing the electroluminescent light to efficiently enter the inside of the electroluminescent pigment without being reflected and scattered.
7. The method for authenticating securities according to claim 6, wherein the transparent material layer covering the electroluminescent pigment is prepared by Chemical Vapor Deposition (CVD) or Physical Chemical Vapor Deposition (PCVD), the optical path length of the transparent material layer is half of the wavelength of the narrow band, and the refractive index of the transparent material layer is the square root of the product of the refractive index of the electroluminescent pigment and the refractive index of the surrounding ink.
8. The method for authenticating a document of value according to claim 1,
the securities are banknotes, certificates, magnetic cards or security securities for preventing counterfeiting, and the carrier is composed of paper, plastic and a composite plastic layer;
the narrow-band laser-like emission is spatially distributed in a coded form;
the electroluminescent pigment and the feedback element which form the resonant cavity are mixed in the same printing ink and are printed in the same printing ink layer on the surface of the carrier by screen printing, engraving or intaglio printing, offset printing or relief offset printing; or
The electroluminescent pigment and the feedback element which form the resonant cavity are mixed in different printing inks and are alternately printed in different printing ink layers on the surface of the carrier by adopting screen printing, engraving or intaglio printing, offset printing or letterpress offset printing.
9. A value document, characterized in that the value document comprises:
a carrier constituting a planar substrate, and
at least one security structure printed or embedded on the surface of said support, the security structure comprising at least one resonant cavity formed by an electroluminescent pigment and a feedback element, the resonant cavity being capable of generating a narrow band laser-like emission of at least one wavelength in response to irradiation by an alternating electric field or electron source having an energy and frequency above a threshold value.
10. The value document according to claim 9,
the electroluminescent pigment is laid on a carrier of the valuable paper in a coded form and comprises an electric field excited luminescent pigment and an electron source excited luminescent pigment;
the feedback element is a scattering particle, an optical multilayer film, a metal film, and a particle formed of the optical multilayer film or the metal film.
11. The value document according to claim 10,
the particle size of the electroluminescent pigment is 1 nanometer to 30 micrometers, the electric field excited luminescent pigment comprises one or any combination of doped II-IV group compounds ZnS, ZnSe, SrS, CaS or CdS, and the electron source excited luminescent pigment comprises rare earth doped oxide Nd, Al2O3Or Yb: Y2O3One or any combination thereof;
the scattering particles comprise an oxide Al2O3、TiO2Or BaIiO3Or particles of a metal Ag, Au or Cu, wherein the oxide particles Al2O3、TiO2Or BaIiO3The grain diameter of the metal grains Ag, Au or Cu is between 1 nanometer and 5 micrometers;
the optical multilayer film is an optical multilayer film with high refractive index and low refractive index which are alternately changed;
the metal film is a metal Au, Ag, Cu and Al film or an alloy film.
12. The document of value according to claim 11, wherein the dopant of the doped group II-IV compound ZnS, ZnSe, SrS, CaS or CdS comprises one or any combination of Cu, Au, Mn as an activator, halide ions or trivalent cations as an activator;
the grain diameter of the electroluminescent pigment is 1 to 100 nanometers, and the oxide particles Al2O3、TiO2Or BaIiO3Has a particle diameter of 50 nm to 1 μm, and the metal particles Ag, Au or Cu have a particle diameter of 1 nm to 100 nm.
13. The document of value according to claim 9, wherein the electroluminescent pigment is further coated with a transparent material for allowing the electroluminescent light to efficiently enter the inside of the electroluminescent pigment without being reflected and scattered.
14. The document of value of claim 13, wherein the layer of transparent material covering the electroluminescent pigment is prepared by chemical vapor deposition CVD or physical chemical vapor deposition PCVD, the optical path length of the layer of transparent material is half the wavelength of the narrow band, and the refractive index of the layer of transparent material is the square root of the product of the refractive index of the electroluminescent pigment and the refractive index of the surrounding ink.
15. The value document according to claim 9,
the securities are banknotes, certificates, magnetic cards or security securities for preventing counterfeiting, and the carrier is composed of paper, plastic and a composite plastic layer;
the narrow-band laser-like emission is spatially distributed in a coded form;
the electroluminescent pigment and the feedback element which form the resonant cavity are mixed in the same printing ink and are printed in the same printing ink layer on the surface of the carrier by screen printing, engraving or intaglio printing, offset printing or relief offset printing; or
The electroluminescent pigment and the feedback element which form the resonant cavity are mixed in different printing inks and are alternately printed in different printing ink layers on the surface of the carrier by adopting screen printing, engraving or intaglio printing, offset printing or letterpress offset printing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101547006A CN101398950B (en) | 2007-09-25 | 2007-09-25 | Method for authenticating document of value |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101547006A CN101398950B (en) | 2007-09-25 | 2007-09-25 | Method for authenticating document of value |
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| CN101398950A true CN101398950A (en) | 2009-04-01 |
| CN101398950B CN101398950B (en) | 2010-12-22 |
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| CN2007101547006A Active CN101398950B (en) | 2007-09-25 | 2007-09-25 | Method for authenticating document of value |
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| CN103493109A (en) * | 2011-04-19 | 2014-01-01 | 联邦印刷有限公司 | Method and device for monitoring security features in security documents |
| CN103597355A (en) * | 2011-06-15 | 2014-02-19 | 国家造币印钞厂-皇家造币厂 | Use of luminescent nanosystems for authenticating security documents |
| CN102114743B (en) * | 2009-12-31 | 2014-11-05 | 中国人民银行印制科学技术研究所 | Marketable file and method for identifying same |
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| CN108777110A (en) * | 2018-05-23 | 2018-11-09 | 江苏集萃工业过程模拟与优化研究所有限公司 | The preparation method of electroluminescent anti-false trademark structure |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4081763A (en) * | 1973-01-04 | 1978-03-28 | Natalya Andreevna Vlasenko | Electroluminescent laser |
| ES503112A0 (en) * | 1980-05-30 | 1982-04-01 | Gao Ges Automation Org | IMPROVEMENTS IN THE MANUFACTURE OF CURRENCY AND SIMI-LARES PAPER |
| ES2032787T3 (en) * | 1987-08-19 | 1993-03-01 | Gao Gesellschaft Fur Automation Und Organisation Mbh | SECURITY ROLE |
| US5903340A (en) * | 1994-03-18 | 1999-05-11 | Brown University Research Foundation | Optically-based methods and apparatus for performing document authentication |
| DE19735293C2 (en) * | 1997-08-14 | 2003-06-12 | Bundesdruckerei Gmbh | Value and security product with luminescent element |
-
2007
- 2007-09-25 CN CN2007101547006A patent/CN101398950B/en active Active
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| CN103597355A (en) * | 2011-06-15 | 2014-02-19 | 国家造币印钞厂-皇家造币厂 | Use of luminescent nanosystems for authenticating security documents |
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Assignee: SECURITY PRINTING INSTITUTE OF PEOPLE'S BANK OF CHINA Assignor: CHINA BANKNOTE PRINTING AND MINTING Corp. Contract record no.: 2011110000103 Denomination of invention: Method for appraising document of value Granted publication date: 20101222 License type: Exclusive License Open date: 20090401 Record date: 20110714 |
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Address after: 100044 Beijing city Xicheng District Xizhimen Street No. 143 triumph building Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 100044 Beijing Xizhimen Street No. 143 Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |
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