CN102114743B - Marketable file and method for identifying same - Google Patents
Marketable file and method for identifying same Download PDFInfo
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- CN102114743B CN102114743B CN200910217557.XA CN200910217557A CN102114743B CN 102114743 B CN102114743 B CN 102114743B CN 200910217557 A CN200910217557 A CN 200910217557A CN 102114743 B CN102114743 B CN 102114743B
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Abstract
The invention relates to a marketable file and a method for identifying the same, and the marketable file and the method belong to the technical field of anti-counterfeiting of safe articles such as bank notes, certificates, magnetic cards, marketable bills, and the like. The invention discloses a marketable file which comprises a marketable file substrate and at least one electroluminescent substance for inspecting the marketable file, wherein the electroluminescent spectrums generated by the electroluminescent substance respectively under the excitations of electric fields of at least two types of characteristic frequencies have different spectral shapes, and the electroluminescent substance is combined with the marketable-file substrate in a code form. Based on the same principle, the invention also discloses a method for identifying the marketable file. Based on the particular relationship determination, the purpose of identifying the marketable files by using electroluminescence is achieved, so that the identification on the marketable files is simpler, more accurate and easier to realize.
Description
Technical field
The field of anti-counterfeit technology that the present invention relates to the value documents such as banknote, certificate, magnetic card, bill, relates in particular to a kind of method for the identification of the value document true and false and a kind of marketable securities with the safety element of anti-counterfeiting characteristic.
Background technology
At present, adulterator is more and more easy to utilize high-tech technology, as color copy machine, advanced person's imaging system and printing technology, manufactures important value document, security and the vouchers such as forged banknote, passport, admission ticket and identity card.The threshold of current holographic security technology and photochromatic printing ink technology is more and more lower, and false proof effect is also weakened gradually.In addition, common anti-counterfeiting technology is as false proof in various visible fluorescences, and the anti-counterfeiting technologies such as temperature induced color changing also easily obtain from the market, and anti-counterfeiting technology is decrypted gradually.Therefore, also more and more higher to the requirement that the marketable securities such as false proof requirement, particularly banknote are false proof.
Patent CN1105654, is entitled as in " with the assignment of light-emitting component and safe product " and has proposed electroluminescent technology in false proof field, is particularly applied in marketable securities as banknote, check, and the application of other negotiable bills etc.The method utilization be more common electroluminescent technology, the frequency of its electroluminescent luminescent spectrum and excitaton source does not have specific relation.Yet along with the false proof rank demand to marketable securities is more and more higher, the luminous anti-counterfeiting technology of electroluminescent also needs continuous lifting.
Patent CN 1806078 " having valency document and having the method for valency document for the manufacture of this with a safety element " discloses electroluminescent pigment and has been wrapped up by a photoactive layer, thereby make electroluminescent spectrum there is a less bandwidth, or realize some special electroluminescent spectrums, contribute to like this to improve the forgery threshold of electroluminescent anti-counterfeiting technology, and facilitate reading of machine high precision.
Luminous also have a key character except luminous intensity and spectral signature, is luminescent lifetime, and its represents can not disappear immediately after fluorescence produces, but have in time a gradually process for decay.For electro optical phenomenon, lot of documents shows, luminescent lifetime is also an important parameter in electroluminescent process, its length is directly connected to the electroluminescent power of this centre of luminescence, when luminescent lifetime matched with the cycle that excites electric field, the electroluminescent intensity that this centre of luminescence is corresponding reaches maximum.Thereby, excite the variation of the variable effect luminescent spectrum of electric field frequency.
For example, " light transmitting and light that the frequency of electroluminescent powder ZnS:Cu causes are buried in oblivion (Frequecy-dependent lightemission and extinction of electroluminescent ZnS:Cu phosphor) " Display, 28, in 112-117 (2007), introduce zinc sulphide and mixed copper, by suitable doping content and synthetic reaction condition, can realize glaucous electroluminescent.Electroluminescent spectrum shows to be formed by stacking by the Gaussian function of four peak positions, is respectively 448nm, 471nm, 504nm, 550nm.The frequency influence that excites electric field is to luminous efficiency corresponding to each peak position, and in general, the frequency of electric field is higher, and shortwave luminous is that the electroluminescent of blue color is easy excitated, and the frequency of electric field is lower, and long wave luminous is that the electroluminescent of green color is easy excitated.Result of study shows, under high-frequency situation, than being easier to short blue light of fluorescence excitation life-span, under low frequency situation, than being easier to long green glow of fluorescence excitation life-span.Similar result is report in document " is controlled variable color electroluminescent device and mechanism research (spectroscopy and spectrum analysis; 26; 23-26; 2006) frequently " also, this article has been studied at zinc sulphide and has been mixed the centre of luminescence Cu that fluorescence lifetime differs greatly, Mn, the variation of exciting field frequency makes the emission spectrum of device that variation occur, and the variation of frequency has changed the number of times that in the unit interval, the different life-span centres of luminescence are excited.
By control luminescent powder particle size, dopant material and concentration, prepare the technique that luminescent powder is taked, regulate the luminescent lifetime that electroluminescent specific wavelength is corresponding, thereby the electric field of realizing frequency change excites lower electroluminescent spectrum shape that specific variation occurs.
Summary of the invention
For the defect in above-mentioned field, the invention provides a kind of value document with anti-counterfeiting characteristic, to realize utilizing to excite electric field frequency to change to realize electroluminescent spectrum, change, with this, identify the true and false of marketable securities, make to identify that the true and false of marketable securities is simple, also accurately realize with being easy to.
In view of this, the present invention also provides a kind of method for the identification of the value document true and false, to realize utilizing to excite electric field frequency to change to realize electroluminescent spectrum, changes, and with this, identifies the true and false of marketable securities, make to identify that the true and false of marketable securities is simple, also accurately realize with being easy to.
A kind of value document, it has value document substrate and for checking at least one electroluminescent property material of this value document authenticity, this electroluminescent substance is combined with value document substrate with the form of coding, it is characterized in that, this electroluminescent property material is under the electric field of at least two kinds of characteristic frequencies excites, and the electroluminescent spectrum producing respectively has not identical spectral shape.
In described value document, be provided with two code areas containing electroluminescent property material, under the exciting of a certain characteristic frequency electric field, two code area colour developings are identical or approximate, and under the exciting of another feature frequency electric field, two code area colour developings are obviously different.
Described coding refers to a kind of this electroluminescent property material, or has the material of this electroluminescent feature with other, or spatially forms figure with the material without this electroluminescent feature.
Described coding comprises bar code, Quick Response Code, three-dimensional code, figure or character; Preferred stripe shape code.
The luminescent spectrum of described electroluminescent property material is 200nm-3 μ m, preferably 380nm-760nm.
Described electroluminescent property material is to be to mix the II-VI compound of impurity or/and BaAlS.
The described II-VI compound that mixes impurity is ZnS, ZnSe, SrS, CaS or the CdS that is mixed with a kind of or its combination in Cu, Ag, Au, P, As, Pb, Fe, Mn ion; Preferably mix Cu or/and Mn or/and the ZnS of Au ion.
In the described II-VI compound that mixes impurity, contain halogens Cl, Br, I, or trivalent ion Al, Ga, In.
Described electroluminescent property material is coated by protective layer.
Described electroluminescent property material is coated by a photoactive layer, described photoactive layer at least one deck is that inorganic material forms, and described inorganic material is metal or half-metal oxide, metal or semimetal nitride, metal or semimetal oxysulfide, metal or semimetal sulfide or doped with metal or semimetallic metal or semimetal sulfide.
Described combination refers to adopt the mode of serigraphy, intaglio printing, letterpress, offset printing or ink jet printing to be printed in value document substrate containing the anti-forgery ink of electroluminescent property material.
The granule size of described electroluminescent property material is 0.2 μ m-35 μ m.
In described anti-forgery ink, also contain solvent and/or auxiliary agent and/or bonding agent.
In described anti-forgery ink, also contain organic pigment and/or other anti-fake material.
Described anti-fake material is infrared absorbing material, infrared up-conversion material, fluorescent material, magnetic material, liquid crystal material, optically variable pigments (OVI) or pearlescent pigment; Preferred colourless ultraviolet fluorescent material.
In described anti-forgery ink, add and have particle diameter to be less than the BaTiO of the high-k of 40 μ m
3and/or SrTiO
3.
Described combination adopts intaglio printing mode to be printed in value document substrate, in described anti-forgery ink, adds and has TiO
2particle.
Described combination is to join in fiber in the process forming at value document, or electroluminescent property material is made in the form affix value document of safety line.
Identify the method for this value document, the first step, excites the suprabasil electroluminescent property material of value document with the electric field that excites of at least two frequencies; Second step, the variation of frequency causes that the electroluminescent spectrum shape of property material changes; The 3rd step, when the variation of spectral shape and predefined meeting, announces that this value document is genuine piece.
It is described that to excite the wavelength of electric field be a wavelength within the scope of electroluminescent spectrum; Preferably electroluminescent spectrum resolves into the wavelength corresponding to peak position of one or more Gaussian function stacks.
The AC field that the described alternating voltage that excites electric field to refer to that positive and negative electrode alternately changes causes.
Described frequency range is 50Hz-50KHz, preferably 200Hz-5KHz.
The present invention relates to a kind of value document, the luminescent lifetime based on electroluminescent property material, by exciting the frequency change of electric field to cause that the color of electroluminescent property material reacts electroluminescent luminescent lifetime, thereby reaches false proof object.
Two code areas are preferably set in value document, under a frequency colour developing of two code areas identical or approximate, under another frequency two code areas colour developings different, two code areas are used in conjunction with, to reach false proof effect.
Electroluminescent property material can form various coded system in value document, preferably adopts the mode of bar code.
Zinc sulfide crystal mainly contains two kinds of crystalline phases, and a kind of is Emission in Cubic, and another is hexagon phase, and in general, hexagon is compared Emission in Cubic and more easily grown, and under two kinds of crystalline phases, has electro optical phenomenon.Wherein the energy gap of six side's phases is 3.7eV, and the energy gap of Emission in Cubic is 3.64eV.Can be luminous after zinc sulphide is activated, active ions mainly contain: Cu, Ag, Au, P, As, Pb, Fe, Mn etc., these active ions are limited in the solubility of zinc sulphide, need to mix other compositions and strengthen solubility, these compositions are mainly halogens Cl, Br, I and trivalent ion Al, Ga, In etc., and these co-activation compositions also play the effect of auxiliary light emission.The implementation method of electroluminescent color has many kinds, and their luminescent lifetime is also had nothing in common with each other.
Such as: zinc sulphide mixes Cu, can produce blue and green electroluminescent, under the condition of low concentration, electroluminescent color is mainly blue color, and under the higher condition of concentration, electroluminescent moral color is mainly green.Document also reported, temperature is greater than under the condition of 1000 degree, and under the HCl atmosphere of high concentration, green emitting center is easy to form, and under low concentration, blue-light-emitting center is easy to form.Document Semicond.Sci.Technol.18 (2003) 512-516 further illustrates, and in general, the position of relative intensity and glow peak is to be determined by the growth conditions of electroluminescent material.Therefore, can be by preparing the process of electroluminescent powder, the various technological parameters such as the temperature of adjusting reaction, atmosphere, affect the growth conditions of electroluminescent material, thereby obtain the electroluminescent pigment of special intensity and glow peak position.The electroluminescent pigment of growing under these different levels of doping and technique, also can have influence on the luminescent lifetime of the corresponding centre of luminescence.
Certainly, electroluminescent matrix is not only confined to zinc sulphide, its mesostroma comprises multiple II-VI compound and composition thereof, for example zinc selenide (ZnSe), strontium sulfide (SrS), calcium sulfide (CaS) or chromic sulfide, also have the electroluminescent matrix of the recent findings such as BaAlS in addition.
The light emitting region of electroluminescent property material of the present invention, except visible ray, comprises 200 nanometers to the 3 micron related light emitting region of whole electroluminescent.Preferred 380nm-760nm.
Electroluminescent property material can select an inorganic compound or organic compound to be coated as protective layer material, to prevent pigment deliquescence or oxidation, and produces toxicity.
Described electroluminescent property material can be coated by a photoactive layer, in this photoactive layer, at least one deck is that inorganic material forms, this inorganic material preferable alloy or half-metal oxide, nitride, oxysulfide, sulfide or (being total to) form doped with metal or semimetallic this class material, thereby realize special electroluminescent spectrum feature.
The associated methods of described electroluminescent property material and value document is mode of printing, as serigraphy, intaglio printing, the mode of printings such as letterpress, offset printing or ink jet printing, realize anti-forgery ink the laying at value document of containing electroluminescent property material.
In order to be suitable for printing, it is that D50 is less than 30 microns that electroluminescent granular size is generally selected average diameter, this big or small general satisfaction screen printing mode; For gravure printing mode, the granular size of electroluminescent powder is generally less than 10 microns, and the mode of printing granular size of protruding seal is generally less than 5 microns; The mode of printing of offset printing, granular size is less than 3 microns.Due to the electroluminescent luminescent properties of the more intense impact of granular size, therefore for mode of printing, should select moderate particle diameter, rather than deliberately select especially little luminous pigment.The granule size of electroluminescent property material is selected 0.2 μ m-35 μ m.
In anti-forgery ink, also include solvent and/or auxiliary agent and/or bonding agent, to adapt to the needs that print and be combined with value document.
In anti-forgery ink, can also comprise colored pigment, be made into false proof required color.
In anti-forgery ink, can also comprise other anti-fake material, as infrared absorbing material, infrared up-conversion material, fluorescent material, magnetic material, liquid crystal material, optically variable pigments (OVI), pearlescent pigment etc., preferred colourless ultraviolet fluorescent material.
In anti-forgery ink, can also comprise the BaTiO3 that particle diameter is less than the high-k of 40 microns, the materials such as SrTiO3, or other metal materials form and move element, are conducive to excite electroluminescent pigment luminous.
In order to observe more clearly electroluminescent spectrum along with the feature of frequency change, so that operator can intuitively identify the true and false of value document accurately.The exciting field of frequency change causes that it is proper mode that the electroluminescent pigment of spectrum change and the electroluminescent pigment that exciting field does not cause spectrum change are used in conjunction with.
For example, two kinds of electroluminescent ink, wherein the pigment in a kind of ink is in zinc sulphide matrix, to mix Mn and Cu, the pigment in another ink is to mix Mn in zinc sulphide matrix.Because the luminescent lifetime of Mn, two kinds of centres of luminescence of Cu is different, frequency excites down lower than the electric field of 150Hz, and the Mn centre of luminescence is easily activated, and the Cu centre of luminescence is not easy to activate, the transition of the main ShiMn of electroluminescent Validation Counter causes, the color of two kinds of electroluminescent pigment is about the same; Increase along with exciting field frequency, the Cu centre of luminescence is activated gradually, the electric field that is greater than 5000Hz when frequency excites down, the emission spectra that the Cu centre of luminescence is corresponding is more and more stronger, zinc sulphide is mixed the electroluminescent color of Mn and Cu gradually to short wave mobile, the electroluminescent pigment of mixing Mn with zinc sulphide forms obvious contrast, exactly because this Mn, luminescent lifetime difference that two kinds of centres of luminescence of Cu are corresponding cause.By observing emission spectrum with exciting field frequency change, thereby determine the difference of the luminescent lifetime of luminous pigment, differentiate on this basis the true and false of electroluminescent pigment, thereby the authenticity of value document is differentiated.
In fact, electroluminescent pigment generally all has the characteristic of luminescence generated by light, and the spectral signature under optical excitation and the high-frequency electric field spectral signature under exciting is more approaching.As described above zinc sulphide mix Cu and Mn and zinc sulphide mix Mn under optical excitation color respectively, the former is partially green, the latter is partially yellow, the former luminescent spectrum comprises the latter's spectrum.In order to allow adulterator relatively be difficult to discover the difference of this luminescent lifetime, can in mixing the electroluminescent pigment of Mn, zinc sulphide add the green luminous pigment of colorless fluorescent, and the fluorescence color of two kinds of ink under ultraviolet excitation is almost approached, human eye indistinguishable.The luminous printing ink that this pairing is used, has several features, and under ultraviolet excitation, color is almost consistent, under LCF excites, color is also basically identical, under high-frequency electric field excites, color demonstrates obvious difference, by these features, can differentiate the true and false of value document.
In addition, in order to make the gravure ink of the electroluminescent color-change of frequency dependence there is higher hiding function, can add the UV absorption transparent pigment that appropriate particle diameter is very little, as the fine particle of TiO2, under ultraviolet excitation, due to the effect of UV absorption pigment, can not excite electroluminescent pigment to launch fluorescence, yet under electric field excites, UV absorption transparent pigment can be not larger affects electric field excitaton source, and electroluminescent can be normally luminous.
The electric field that excites of frequency change causes the electroluminescent material that electroluminescent spectrum changes, application is except adding to pigment the mode of printing in ink, also be included in and join paper, join fiber, be prepared into the forms such as safety line and be applied to the false proof of value document.
For example, variable color electroluminescent paper, in paper forming process, orientation is discharged the electro-luminescent particles of two kinds of different qualities.By applying electric field, when frequency changes, the situation that other electric field parameters are constant, can find that the color of different electro-luminescent particles changes.Particularly, can realize under certain frequency excites, the glow color of two kinds of light-emitting particles is the same; Change frequency to a certain value, color will occur significantly to change.
Variable color electroluminescent safety line, coated heat melten gel on the PET film of aluminizing, and reserving somewhere not coated heat melten gel of abundant position, object is in order to guarantee that electrode can contact with the aluminium coated on PET.Then, the electro-luminescent particles orientation of two kinds of different qualities is discharged in melten gel position, by heat treatment, light-emitting particles and PET film are bonded together afterwards.This film is cut to required width and obtain color-changing light-emitting safety line.Detector by suitable, applies electric field, and when frequency changes, the situation that other electric field parameters are constant, can find that the color of different electro-luminescent particles changes.Particularly, can realize under certain frequency excites, the glow color of two kinds of light-emitting particles is the same; Change frequency to a certain value, color will occur significantly to change.
Identify the method for this value document, the first step, excites the suprabasil electroluminescent property material of value document with the electric field that excites of at least two frequencies; Second step, the variation of frequency causes that the electroluminescent spectrum shape of property material changes; The 3rd step, when the variation of spectral shape and predefined meeting, announces that this value document is genuine piece.
The specific wavelength that excites electric field to produce is according to the needs of value document authenticity, selects a wavelength within the scope of electroluminescent spectrum, and preferably electroluminescent spectrum resolves into the wavelength corresponding to peak position of one or more Gaussian function stacks.
The AC field that the described alternating voltage that excites electric field to refer to that positive and negative electrode alternately changes causes, described frequency refers to 50Hz-50KHz, preferably 200Hz-5KHz scope.
In machine-readable process, according to the be stimulated impact of source frequency of electroluminescent emission spectrum, so can, by add optical filter when before photo-detector, detect electroluminescent spectrum with the impact that excites electric field frequency to change.
Utilize the present invention, surface printing by the carrier at value document or be embedded at least one safeguard construction, this safeguard construction at least comprises the electroluminescent property material of a specific luminescent lifetime, under this electroluminescent property material can excite at the electric field of specific change, there is specific variation in emission spectrum, this specific relation is judged, has realized the true and false of utilizing electroluminescent to identify value document, makes to identify that the true and false of marketable securities is more simple, accurately and be easy to realize.
The ink pairing of the present invention by two kinds of different colours variation characteristics used, thereby simpler, accurately and be easy to the false proof of the mode value document realized.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the evaluation marketable securities true and false provided by the invention;
Fig. 2 represents that zinc sulphide mixes the variation of Mn and Cu emission spectrum under the exciting of the AC field of frequency change, and solid line represents 400Hz, and dotted line represents the frequency that 4000Hz is corresponding, and electric-field intensity is about.
Fig. 3 represents that zinc sulphide mixes the variation of Mn emission spectrum under the exciting of the AC field of frequency change, and solid line represents 400Hz, and dotted line represents the frequency that 4000Hz is corresponding, and electric-field intensity is about.
Fig. 4 represents the front elevation of a banknote, adopts ZnS:Mn in main scape figure position, and two kinds of electroluminescent pigment of Cu and Zns:Cu, with the printing of gravure mode.Frequency is that the electric field of 400Hz excites down, and because the spectrum difference that two kinds of luminous pigments send is little, what main scape figure can be complete presents.
The front elevation of banknote described in Fig. 5 presentation graphs 4, the electric field that frequency is 4000Hz excites down, and the spectrum difference of sending due to two kinds of luminous pigments is larger, and main scape figure has obvious contrast in the position of printing different ink.
Fig. 6 represents the back view of a banknote, adopts ZnS:Mn in denomination position, the lower right corner, and two kinds of electroluminescent pigment of Cu and Zns:Cu, print with screen printing mode.Frequency is that the electric field of 400Hz excites down, and because the spectrum difference that two kinds of luminous pigments send is little, what lower right corner denomination can be complete presents.
Fig. 7 represents the back view of a banknote, and the electric field that frequency is 4000Hz excites down, and the spectrum difference of sending due to two kinds of luminous pigments is larger, and lower right corner denomination has obvious contrast in the position of printing different ink.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Core content of the present invention is: a kind of value document and the method that detects this value document authenticity, this value document is encoded based on electroluminescent luminescent lifetime feature, by exciting the frequency change of electric field to cause that electroluminescent spectrum changes to react electroluminescent luminescent lifetime feature, thereby the coding characteristic on value document detected, reach the antifalse effect of value document, in like manner realize the true and false of value document and differentiate.
The variation of the electroluminescent spectral signature that the electric field changing for observed frequency excites, a simple coded system preferably electroluminescent substance pairing of two kinds of luminescent lifetime features is used.Two kinds of electroluminescent substance for example with different frequency response are mixed with the same face that printing-ink is printed on same value document, and the spectrum of this electroluminescent property material transmitting is at visible-range.The color of two kinds of ink is made under visible ray unanimously or is very approaching, and human eye is difficult for discovering.In some cases, because two kinds of electroluminescent ink are under ultraviolet excitation, color has fine difference, by adding a small amount of burst of ultraviolel to produce the colorless fluorescent powder of fluorescence, makes two kinds of electroluminescent ink excite lower color about the same at uviol lamp.In order to make adulterator be difficult for discovering this coding form, under common electroluminescent testing conditions, while being 400Hz left and right as frequency, under the electroluminescent substance electric field excitation using in coding glow color unanimously or very approaching, and another one frequency as the electric field excitation of 4000Hz under, send the light of different colours, the mode that pairing is used, no matter be that human eye or machine read, be all easy to detect coding, thereby differentiate the true and false of value document.
As shown in Figure 1, Fig. 1 is the method flow diagram of the evaluation marketable securities true and false provided by the invention, and the method comprises the following steps:
Step 101: the AC field of frequency change or electron source excite the coding region of value document;
Step 102: along with the variation of the frequency of AC field or electron source causes the variation of electroluminescent property material emission spectrum, if meet specific variation relation, announce that this value document is genuine piece.
Described in above-mentioned steps 101, excite marketable securities coding region to comprise: at least one safeguard construction that excites marketable securities coding region to comprise with AC field or the electron source on frequency change ground, the variation of the emission spectrum of this safeguard construction electroluminescent property material, if meet specific variation relation
Above-mentioned electroluminescent material refers to that the II-IV compounds of group of doping comprises that the doping material in ZnS, ZnSe, SrS, CaS or CdS comprises a kind of or any combination in Cu, Au, Mn as activator, comprises halide ion or Tricationic as activator.
Above-mentioned marketable securities are banknote, certificate, magnetic card or the default free securities that prevents forgery, and described carrier consists of paper, plastics, composite plastic layer.Adopt serigraphy, engraving or intaglio printing, hectographic printing or letterset to be printed in the same ink layer of described carrier surface; Adopt serigraphy, engraving or intaglio printing, hectographic printing or letterset to be alternately printed in the different ink layeies of described carrier surface.
Embodiment 1
Be illustrated in figure 2 the electroluminescent pigment in a kind of ink of selecting pairing use, the material of this pigment is that zinc sulphide is mixed Mn and Cu, Fig. 2 is illustrated in the variation of emission spectrum under the exciting of AC field of frequency change, solid line represents the luminescent spectrum that 400Hz is corresponding, dotted line represents the luminescent spectrum of the frequency that 4000Hz is corresponding, and electric-field intensity is about 10
6-10
7v/m.Figure 3 shows that the electroluminescent pigment in the another kind of ink of selecting pairing use, the material of this pigment is that zinc sulphide is mixed Mn, Fig. 3 is illustrated in the variation of emission spectrum under the exciting of AC field of frequency change, solid line represents the luminescent spectrum that 400Hz is corresponding, dotted line represents the luminescent spectrum of the frequency that 4000Hz is corresponding, and electric-field intensity is about 10
6-10
7v/m.
Fig. 4 represents that these two kinds of electroluminescent ink are printed on the main scape figure in front of banknote by the mode of gravure.In main scape figure position, adopt ZnS:Mn, two kinds of electroluminescent pigment of Cu and Zns:Cu.Frequency is that the electric field of 400Hz excites down, and because the spectrum difference that two kinds of luminous pigments send is little, what main scape figure can be complete presents.The front elevation of banknote described in Fig. 5 presentation graphs 4, the electric field that frequency is 4000Hz excites down, and the spectrum difference of sending due to two kinds of luminous pigments is larger, and main scape figure has obvious contrast in the position of printing different ink.
Embodiment 2
The mode of employing serigraphy is printed the electroluminescent ink of two kinds of luminescent lifetimes.Fig. 6 represents the back view of a banknote, adopts ZnS:Mn in denomination position, the lower right corner, and two kinds of electroluminescent pigment of Cu and Zns:Cu, print with screen printing mode.Frequency is that the electric field of 400Hz excites down, and because the spectrum difference that two kinds of luminous pigments send is little, what lower right corner denomination can be complete presents.
Fig. 7 represents the back view of a banknote, and the electric field that frequency is 4000Hz excites down, and the spectrum difference of sending due to two kinds of luminous pigments is larger, and lower right corner denomination has obvious contrast in the position of printing different ink.
Claims (23)
1. a value document, its have value document substrate and for check this value document authenticity more than a kind of electroluminescent property material, this electroluminescent property material is combined with value document substrate with the form of coding, it is characterized in that, this electroluminescent property material is under the electric field of at least two kinds of characteristic frequencies excites, the electroluminescent spectrum producing respectively has not identical spectral shape, in described value document, be provided with two code areas containing electroluminescent property material, under the exciting of a certain characteristic frequency electric field, two code area colour developings are identical or approximate, under the exciting of another feature frequency electric field, two code area colour developings are obviously different, the luminescent spectrum of described electroluminescent property material is 200nm-3 μ m, described frequency size is 50Hz-50KHz, add and make electroluminescent property material color under burst of ultraviolel colorless fluorescent powder about the same, the spectrum of described electroluminescent property material transmitting is in visible-range.
2. value document according to claim 1, described coding refers to described electroluminescent property material, has the material of electroluminescent feature with other, or spatially forms figure with the material without electroluminescent feature.
3. value document according to claim 1, described in be encoded to a kind of or its combination in bar code, Quick Response Code, three-dimensional code, character.
4. value document according to claim 3, described in be encoded to bar code.
5. value document according to claim 1, the luminescent spectrum of described electroluminescent property material is 380nm-760nm.
6. value document according to claim 1, described electroluminescent property material is to mix the II-VI compound of impurity or/and BaAlS.
7. value document according to claim 6, described in mix impurity II-VI compound be ZnS, ZnSe, SrS, CaS or the CdS that is mixed with a kind of or its combination in Cu, Ag, Au, P, As, Pb, Fe, Mn ion.
8. value document according to claim 7, preferably mix Cu or/and Au or/and the ZnS of Mn ion.
9. according to the value document described in claim 7 or 8, described in mix in the II-VI compound of impurity and contain halogens Cl, Br, I, or trivalent ion Al, Ga, In.
10. value document according to claim 1, described electroluminescent property material is coated by protective material.
11. value documents according to claim 1, described electroluminescent property material is coated by a photoactive layer, described photoactive layer at least one deck is that inorganic material forms, and described inorganic material is metal oxide or half-metal oxide, metal nitride or semimetal nitride, metal oxygen sulfide or semimetal oxysulfide, metal sulfide or semimetal sulfide or doped with metal or semimetallic metal sulfide or semimetal sulfide.
12. value documents according to claim 1, described combination refers to adopt the mode of serigraphy, intaglio printing, letterpress, offset printing or ink jet printing to be printed in value document substrate containing the anti-forgery ink of electroluminescent property material.
13. value documents according to claim 12, the granule size of described electroluminescent property material is 0.2 μ m-35 μ m.
14. value documents according to claim 12, also contain solvent and/or auxiliary agent and/or bonding agent in described anti-forgery ink.
15. value documents according to claim 12, in described anti-forgery ink, also contain organic pigment and/or other anti-fake material, described other anti-fake material is infrared absorbing material, infrared up-conversion material, fluorescent material, magnetic material, liquid crystal material, optically variable pigments (OVI) or pearlescent pigment.
16. value documents according to claim 12, add in described anti-forgery ink and have particle diameter to be less than BaTiO3 and/or the SrTiO3 of the high-k of 40 μ m.
17. value documents according to claim 12, described combination adopts intaglio printing mode to be printed in value document substrate, adds and have TiO2 particle in described anti-forgery ink.
18. value documents according to claim 1, described combination is to join in fiber in the process that value document forms, or the form that electroluminescent property material is made safety line is additional in value document.
19. identify the method for value document claimed in claim 1, and the first step excites the suprabasil electroluminescent property material of value document with the electric field that excites of at least two frequencies; Second step, the variation of frequency causes that the electroluminescent spectrum shape of property material changes; The 3rd step, when the variation of spectral shape and predefined meeting, announces that this value document is genuine piece.
20. methods according to claim 19, described in to excite the wavelength of electric field be a wavelength within the scope of electroluminescent spectrum.
21. methods according to claim 19, described in to excite the wavelength of electric field be wavelength corresponding to peak position that electroluminescent spectrum resolves into one or more Gaussian functions stacks.
22. methods according to claim 19, described in excite electric field to refer to that positive and negative electrode alternately changes the AC field that causes of alternating voltage.
23. methods according to claim 19, described frequency size is 200Hz-5KHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102011087637A1 (en) * | 2011-12-02 | 2013-06-06 | Bundesdruckerei Gmbh | Identification document with a machine-readable zone and document reader |
| CN106671639A (en) * | 2017-01-25 | 2017-05-17 | 上海先幻新材料科技有限公司 | Secure file containing friction-modulated luminescent compound |
| CN107633596A (en) * | 2017-08-14 | 2018-01-26 | 深圳怡化电脑股份有限公司 | A kind of method, apparatus and storage medium for identifying bank card |
| 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 |
| DE102018007289A1 (en) * | 2018-09-14 | 2020-03-19 | Giesecke+Devrient Currency Technology Gmbh | Document of value system |
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| CN1271310A (en) * | 1997-08-14 | 2000-10-25 | 联邦印刷有限公司 | Value and security product with luminescent element |
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Address after: 100070 8th floor, building 2, No.5 Zhonghe Road, Fengtai Science City, Fengtai District, Beijing Patentee after: China Banknote Printing Technology Research Institute Co.,Ltd. Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 100070 8th floor, building 2, No.5 Zhonghe Road, Fengtai Science City, Fengtai District, Beijing Patentee before: China Banknote Printing Technology Research Institute Co.,Ltd. Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |
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