JP5498331B2 - Information recording medium, authenticity determination method thereof, and authenticity determination system - Google Patents

Description

  Embodiments described herein relate generally to an information recording medium, an authenticity determination method, and an authenticity determination system using an emission spectrum of a rare earth fluorescent complex.

  In recent years, the authenticity determination means has become increasingly important.

  In general, in a security method using fluorescent dyes and pigments, images, symbols, and other formations that cannot be visually recognized by visible light appear and can be recognized by irradiating light at a specific wavelength, particularly ultraviolet light. . Conventionally, a method of forming a pattern using an inorganic fluorescent pigment and causing the pattern to appear by ultraviolet irradiation has been disclosed, but since the inorganic fluorescent pigment exists as particles, the pattern can be visually recognized thinly under visible light. There is a problem with sex.

  On the other hand, a security method using a rare earth fluorescent complex has been reported.

  Since the rare earth fluorescent complex is transparent under visible light and dissolves in the medium and does not scatter light, it is highly secure in that it cannot be visually recognized. Therefore, security is maintained by printing an image such as a photograph, irradiating it with ultraviolet light, and collating it with a normal photograph. However, forgery is possible by inspecting the entire surface by irradiating ultraviolet rays, and it is impossible to construct a high-level security system by itself.

JP 2002-173622 A JP 2002-88282 A

  The present embodiment has been made in view of such circumstances, and an object thereof is to obtain an information recording medium, authenticity determination method, and authenticity determination system with good security by using a rare earth fluorescent complex.

According to an embodiment, an excitation light is irradiated to an information recording medium including a base material and an information recording layer provided on the base material and containing a rare earth fluorescent complex capable of appearing an emission intensity peak at two or more wavelengths. , A two-wavelength emission intensity measuring unit that measures the emission intensity at the first wavelength and the second wavelength different from the first wavelength in parallel, and determines the first emission intensity and the second emission intensity;
A numerical processing unit that receives the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit, and calculates a relative intensity ratio between the first emission intensity and the second emission intensity; And the authenticity determination system provided with the determination part which collates the relative intensity ratio information sent from this numerical process part, and the relative intensity ratio information obtained from authenticity determination information, and performs authenticity determination is obtained.

It is a block diagram showing an example of composition of a true / false determination system of an embodiment. It is a front view showing an example of the information recording medium of an embodiment. It is AA sectional drawing of FIG. It is a flow showing an example of the authenticity determination method of embodiment. It is a flow showing other examples of the authenticity determination method of an embodiment. It is a graph showing the emission spectrum of Eu (III) complex which is 1 type of the rare earth fluorescent complexes which can be used for embodiment. It is a graph showing the emission spectrum of the Tb (III) complex which is 1 type of the rare earth fluorescent complexes which can be used for embodiment. It is sectional drawing showing an example of a structure of the ink ribbon which can be used for embodiment.

  The information recording medium according to the embodiment includes a base material and an information recording layer that is provided on the base material and contains a rare earth fluorescent complex capable of appearing an emission intensity peak at two or more wavelengths.

  In the authenticity determination system and the authenticity determination method according to the embodiment, authenticity determination is performed on the information recording medium.

  Hereinafter, embodiments will be described in more detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of a true / false determination system according to an embodiment.

  As illustrated, the authenticity determination system 100 according to the embodiment includes a two-wavelength emission intensity measurement unit 101, a numerical processing unit 102, and a determination unit 103.

  The two-wavelength emission intensity measuring unit 101 irradiates the information recording medium with excitation light, measures in parallel the emission intensity at the first wavelength and the second wavelength different from the first wavelength, It is provided for determining the emission intensity and the second emission intensity.

The numerical processing unit 102 receives the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit 101, and calculates the relative intensity ratio between the first emission intensity and the second emission intensity. It is provided to do.
The determination unit 103 is provided to collate the relative intensity ratio information sent from the numerical processing unit 102 with the relative intensity ratio information obtained from the authenticity determination information and perform authenticity determination.

  For example, the authenticity determination information can be obtained from the authenticity determination information recording unit 104. The authenticity determination information recording unit 104 can be provided on a base material of an information recording medium, for example.

  FIG. 2 is a front view illustrating an example of the information recording medium according to the embodiment.

  FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  As shown in the drawing, an ID card 10 as an example of an information recording medium according to the embodiment includes a base material 1 and information recording layers such as a character information layer 3 and an image information layer 2 provided thereon. The rare earth fluorescent complex can be included in at least a part of the information recording layer. It can be used with a polymer that dissolves the rare earth fluorescent complex. The rare earth fluorescent complex can be used together with a polymer that dissolves the rare earth fluorescent complex. For example, it can be added to the ink for forming the image information layer 2. Optionally, a true / false determination information recording unit 4 can be provided in the upper right corner of the image information layer 2. A protective layer 5 can be provided on the substrate 1, the character information layer 3, the image information layer 2, and the authenticity determination information recording unit 4.

  Although an example in which the authenticity determination information recording unit is provided on the information recording medium has been described here, the present invention is not limited to this. For example, the authenticity determination information is preliminarily stored in a data storage unit that can be connected to the determination unit. It can be remembered.

  FIG. 4 shows a flow representing an example of the authenticity determination method according to the embodiment.

  In the authenticity determination method according to the embodiment, two-wavelength emission intensity measurement (block 1), numerical processing (block 2), and authenticity determination (block 3) are performed.

  In the two-wavelength emission intensity measurement (Block 1), the two-wavelength emission intensity measurement unit irradiates the information recording medium with excitation light, and the first wavelength and the second wavelength different from the first wavelength are measured. The first emission intensity and the second emission intensity are measured in parallel.

  In the numerical processing (block 2), the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit are received, and the relative intensity ratio between the first emission intensity and the second emission intensity is determined. calculate.

  In the authenticity determination (block 3), the relative intensity ratio information sent from the numerical processing unit and the relative intensity ratio information obtained from the authenticity determination information are collated, and a determination is made based on the collation result.

  The authenticity determination system and the authenticity determination method according to the embodiment utilize the specificity of the spectrum shape of the rare earth fluorescent complex, and emit light based on emission intensity at two or more wavelengths in the emission spectrum, for example, electric dipole transition. The intensity of the peak and the intensity of the emission peak based on the magnetic dipole transition are measured in parallel, and the relative intensity ratio is obtained.

  The relative intensity ratio is unique to each rare earth fluorescent complex as long as the polymer dissolving the rare earth fluorescent complex used is the same.

  Even if almost the same light emission is obtained visually, the relative intensity ratio varies if the molecular structure of the rare earth fluorescent complex is different.

  Even if the rare earth fluorescent complex used is the same, the relative intensity ratio varies if the polymer to be dissolved is different.

  Furthermore, even if the rare earth fluorescent complex used is the same, even if the blending ratio with the polymer to be dissolved is different, no significant fluctuation is detected.

  For this reason, according to the embodiment, whether the molecular structure of the rare earth fluorescent complex used, the polymer to be dissolved, the rare earth fluorescent complex and the polymer blending ratio match the information recorded in advance in the authenticity determination information recording unit, etc. Or, it is possible to easily determine whether they are inconsistent, and the security is improved.

  Further, for example, in addition to the two-wavelength emission intensity measurement shown in FIG. 4, the emission intensity, for example, I3 is measured at an arbitrary wavelength of at least one wavelength, for example, λ3, between the two wavelengths, for example, λ1, λ2. The emission intensity can be measured by confirming that the emission intensity is smaller than either I1 or I2.

  When the emission intensity I3 is higher than either of the emission intensity I1 and I2 at the two wavelengths, the authenticity determination is determined to be false.

  In such a case, for example, a phosphor that emits light broadly is used, or a phosphor having emission intensity and peak at a wavelength different from that of the rare earth fluorescent complex to be measured is used. Possible cause.

  FIG. 5 shows a flow representing another example of the authenticity determination method according to the embodiment.

  As shown in the figure, in this authenticity determination method, when the result of the initial authenticity determination is received (block 4), the two-wavelength emission intensity measurement, numerical processing, and authenticity determination are performed again for the same medium. The obtained true / false judgment result is compared with the previous true / false judgment result, and finally the true / false is determined by the coincidence (block 5), and the obtained true / false judgment result; Compared with the previous true / false judgment result, if the two results do not match, in addition, the two-wavelength emission intensity measurement, numerical processing, and true / false judgment are performed, and the obtained true / false judgment result 4 is the same as the method shown in FIG. 4 except that the two-wavelength emission intensity measurement, numerical processing, and authenticity determination are repeated until the previous authenticity determination result matches.

FIG. 6 shows an emission spectrum of an Eu (III) complex having a molecular structure represented by the following formula (1), which is a kind of rare earth fluorescent complex that can be used in the embodiment.

  In FIG. 6, the emission spectrum intensity 602 based on the electric dipole transition having a peak at a wavelength of 612 nm is greatly affected by the molecular structure of the ligand of the complex and the kind of the polymer to be dissolved. On the other hand, emission spectrum intensities 601 based on magnetic dipole transitions having peaks at wavelengths of 580 nm, 594 nm, 650 nm, and 700 nm, respectively, are not affected by these and have a substantially constant emission intensity. From the above, the ratio of the emission intensity based on the electric dipole transition and the magnetic dipole transition is a value specific to the molecular structure of the complex and the type of polymer to be dissolved. In other words, when attempting to counterfeit using a fluorescent complex with a molecular structure different from the fluorescent complex used by the security installation side, even if visual emission cannot be distinguished, it is immediately possible to determine its authenticity by grasping the ratio of the emission spectrum. Can be determined.

FIG. 7 shows an emission spectrum of a Tb (III) complex having a molecular structure represented by the following formula (2), which is a kind of rare earth fluorescent complex that can be used in the embodiment.

  In the figure, 603 having a peak at a wavelength of 544 nm is an emission spectrum intensity based on a magnetic dipole transition, and 604 is an emission spectrum intensity based on a magnetic dipole transition having peaks at wavelengths of 492 nm, 588 nm, and 624 nm, respectively. Are shown respectively.

  In FIG. 7, as in the case of the Eu (III) complex, when a counterfeit is attempted using a fluorescent complex having a molecular structure different from that of the fluorescent complex used by the side where the security is installed, the visual emission cannot be distinguished. By grasping the spectrum ratio, it is possible to immediately determine its authenticity.

  By mixing a plurality of rare earth fluorescent complexes such as Eu (III) complex and Tb (III) complex, it is possible to construct a stronger security system.

  The emission spectrum detection method is to measure the intensity of the two wavelengths of the emission peak wavelength of the electric dipole transition and the magnetic dipole transition in parallel, preferably at the same time, and calculate the relative intensity ratio instantaneously to the specified value. It can be verified whether or not. When the method of the embodiment is used, the measurement takes less time than measuring the entire emission spectrum, and it can be applied to various applications that require low cost and good security.

  In general, organic phosphors cannot be subjected to authenticity determination as described above because not only the emission intensity but also the emission wavelength varies greatly depending on the polymer to be dissolved.

  On the other hand, the rare earth fluorescent complex according to the embodiment was placed with light emission based on a magnetic dipole transition in which the wavelength hardly shifts depending on the molecular structure or existence condition and the light emission intensity does not change in the placed environment. This system is only possible with rare earth fluorescent complexes that have separate emission based on the electric dipole transition whose emission intensity varies depending on the environment.

  The polymer that dissolves the rare earth fluorescent complex used in the embodiment is preferably a transparent resin such as an acrylic resin, a polyester resin, or a vinyl chloride-vinyl acetate copolymer resin. More preferably, it is highly polar.

  Specifically, the acrylic resin used in the embodiment is made by Mitsubishi Rayon Co., Ltd., Dialal BR-53, Dialnal BR-64, Dialnal BR-77, Dialnal BR-79, Dialnal BR-90. , Dialnal BR-93, dialnal BR-101, dialnal BR-102, dialnal BR-105, dialnal BR-106, dialnal BR-107, dialnal BR-112, dialnal BR-115, diamond Narnal BR-116, Dianal BR-117, Dianar BR-118, and the like.

  Specific examples of the polyester resin used in the embodiment include Byron 200, Byron 220, Byron 220, Byron 245, Byron 270, Byron 280, Byron 290, Byron GK640, Byron GK880, Byron SI-173, manufactured by Toyobo Co., Ltd. Byron RN-9300, Byron RN-9600, Byronal MD-1245, Unitika Ltd. Elitel UE-3200, Elitel UE-3201, Elitel UE-3203, Elitel UE-3600, Elitel UE-9600, Elitel UE-9800, Elitel UE-3660 and the like.

  Specific examples of the vinyl chloride-vinyl acetate copolymer resin used in the embodiment include Dow Chemical's VYNS-3, VYHH, VYHD, VMCH, VMCC, VMCA, VERR-40, VAGH, VAGD, VAGF, VROH, Examples include Solven C, Solvein CL, Solvein CH, Solvein CN, Solvein C5, Solvein M, Solvein ML, Solvein TA5R, Solvein TAO, Solvein MK6 and Solvein TA2 manufactured by Nissin Chemical Industry Co., Ltd.

The rare earth fluorescent complex used in the embodiment needs to satisfy three characteristics of durability against light, emission intensity, and printing performance. As a result of various studies, we have found that an Ln (III) complex having a molecular structure represented by the following formula (1) best satisfies the above characteristics.

In the formula (3), Ar ¹ and Ar ² may be the same or different aromatic substituents or their substituents, and R ³ and R ⁴ may be either the same or different linear or branched structures. Alkyl group, alkoxy group, R ¹ (F), R ² (F) may be the same or different perfluoroalkyl group, n is an integer of 2 or more, and Ln (III) is a rare earth ion .

Furthermore, it has been found that the rare-earth fluorescent complex used in the embodiment satisfies the above-described characteristics of the Ln (III) complex having a molecular structure represented by the following formula (4).

  In the formula (4), R 1, R 2, R 3 and R 4 are the same or different aromatic substituents or alkyl groups, alkoxy groups which may be either linear or branched structures, or substituted products thereof, all the same Except the case. R1 (F) and R2 (F) may be the same or different perfluoroalkyl groups, and Ln (III) is a rare earth ion.

  The security medium according to the embodiment can be realized by forming an image or a pattern by thermal transfer printing or the like. FIG. 8 shows a cross-sectional view of the ink ribbon when performing thermal transfer printing.

  As shown in the figure, the ink ribbon 20 has a base material 7, a heat resistant layer 6 formed on one main surface of the base material 7, and a melt type or sublimation on the other main surface of the base material 7. The mold thermal transfer ink layer 8 is described.

  According to the embodiment, the intensity ratio of the emission peak based on the magnetic dipole transition and the electric dipole transition, which can vary depending on the molecular structure of the rare earth fluorescent complex used and the type of polymer to be dissolved and is not influenced by other factors. Can be used as a reference for authenticity determination. As a result, it is possible to make a true / false judgment by matching both the rare earth fluorescent complex and the polymer type, and furthermore, by matching the mixing ratio of the rare earth fluorescent complex and the polymer, a simple and inexpensive system can provide more security. Good authenticity determination can be performed.

Experimental Example Hereinafter, an example will be shown, and the embodiment will be described in more detail.

Example 1
The information recording medium according to the embodiment was prepared as follows, and its light durability, brightness, and printing accuracy were measured and evaluated.

Preparation of a heat-meltable ink ribbon A 4.5 μm thick transparent polyester film (manufactured by Toray Industries, Inc., product number: Lumirror Q27) with a heat-resistant film provided on one surface is prepared, and the other surface of the polyester film is prepared. The hot melt ink coating liquid having the following composition was applied using a gravure coater so that the coating thickness after drying would be 3 μm, and heated and dried at 120 ° C. for 2 minutes, respectively. And a hot-melt ink ribbon was obtained.

Heat-meltable ink layer coating solution Methyl ethyl ketone 40 parts by weight Toluene 40 parts by weight Byon 220 manufactured by Toyobo Co., Ltd. 14 parts by weight Rare earth fluorescent complex represented by formula (5) 6 parts by weight

  The obtained hot-melt ink ribbon and a commercially available PPC paper were overlapped, and image recording was performed with a 600 dpi thermal head from the back side of the hot-melt ink ribbon to obtain an image-containing information recording medium such as an ID card.

  Light durability, brightness, and printing accuracy were measured and evaluated under the following conditions.

Durability The medium on which the image was recorded was left in a long-life xenon weather meter WEL-75X-HC-BEC manufactured by Suga Test Instruments Co., Ltd. for 7 days, and the change in the residual ratio of the emission intensity was measured by Fluorescence Spectroscopy manufactured by JASCO. Measured with a photometer FP-6600.

  The residual ratio of emission intensity was obtained from the following equation.

Residual rate (%) = (emission intensity after test) / (emission intensity before test) × 100 (%)
As a result, the residual ratio of the emission intensity was as good as 88 (%).

  In addition, 70% or more of the remaining rate is good, 40% or more and less than 70% is a little good, and less than 40% is a bad.

Brightness (emission intensity)
The emission intensity of the medium on which the image was recorded was measured with a fluorescence spectrophotometer FP-6600 manufactured by JASCO. As a result, the overall emission intensity was 420, which was good.

  The emission intensity at a wavelength of 580 nm is 324, and the emission intensity at a wavelength of 700 nm is 23.

  The emission intensity ratio is 14.1.

Evaluation Method of Printing Accuracy The shape of the dot on the medium on which the image was recorded was observed with a stereomicroscope, and the variation in the dot area and the presence or absence of the center of the dot were examined. When the variation in the dot area was within ± 10%, it was evaluated as good, and when it exceeded ± 10%, it was evaluated as defective. Moreover, the case where there was no center omission was evaluated as good, and the case where it was present was evaluated as defective. As a result, the variation in the dot area was as good as 4%.

  As described above, it has been found that the three characteristics of light durability, printing accuracy, and light emission intensity are all good and can be used practically as an information recording medium.

Further, the emission spectrum of hot melt ink, dual wavelength simultaneous detection was systems measured using a Nippon Sheet Glass Co. fiber optic fluorescence detector, the peak intensity ratio _{^{(5 D 0 ⇒ 7 F 2}} ) / (5 D 0 ⇒ ⁷ F ₁ ) was 8.0.

  Moreover, the weight of the rare earth fluorescent complex with respect to the polymer Byron 220 used was 42.86% by weight.

Example 2
An image-recorded information recording medium was prepared in the same manner as in Example 1 except that a complex having a molecular structure represented by the following formula (6) was used instead of the rare earth fluorescent complex represented by the formula (5).

  The light durability, printing accuracy, and brightness were measured and evaluated in the same manner as in Example 1. As a result, the light durability was 82% and the light emission intensity was 384, which was favorable. However, the printing accuracy was slightly inferior with 23% variation in the dot area.

  The reason why the printing accuracy is slightly poor is that the transfer capability at the time of thermal transfer is not good, that is, the film quality is strong and the transfer is difficult. In general, introduction of fluorine atoms into the solute tends to make the polymer brittle. That is, both of the substituents of β diketone need to be fluoroalkyl groups.

Example 3
An image-recorded information recording medium is prepared in the same manner as in Example 1 except that a rare earth fluorescent complex having a molecular structure represented by the following formula (1) is used instead of the rare earth fluorescent complex represented by the formula (5). did.

  Evaluation of light durability, printing accuracy, and brightness in the same manner as in Example 1 revealed that the light durability, brightness, and printing accuracy were somewhat inferior.

  The complex represented by the formula (1) is characterized by extremely excellent solubility in a solvent as compared with other complexes. It is thought that durability deteriorated because it behaves as a dye in the polymer.

Example 4
In the same manner as in Example 1, except that a rare earth fluorescent complex having a molecular structure represented by the following formula (7) is used instead of the rare earth fluorescent complex represented by the formula (5), an information recording medium containing images It was created.

  Evaluation of light durability, printing accuracy, and brightness in the same manner as in Example 1 revealed that although the brightness was good, the light durability and printing accuracy were slightly inferior.

  In the rare earth fluorescent complex having the molecular structure represented by the formula (7), the acidity of H at the center of the β-diketone that becomes active methylene is improved by introducing an aromatic substituent into the β-diketone ligand. However, it seems that decomposition was accelerated and light durability was lowered.

Examples 5-9
Eu (III) complexes having a molecular structure represented by the following formulas (8) to (12) are respectively synthesized, and the emission spectrum in an ethyl acetate solution is a two-wavelength simultaneous detection system manufactured by Nippon Sheet Glass Co., Ltd. Optical fiber type fluorescence When the peak intensity ratio ( ⁵ D ₀ ⇒ ⁷ F ₂ ) / ( ⁵ D ₀ ⇒ ⁷ F ₁ ) was measured using a detector, the results shown in Table 1 below were obtained.

  Although Eu (III) complexes having molecular structures represented by the formulas (8) to (12) have similar structures to each other, the peak intensity ratio differs as shown in Table 1 above.

  Thus, it is understood that each rare earth fluorescent complex used in the information recording medium according to the embodiment has a specific peak intensity ratio.

  In this way, the rare earth fluorescent complex uses the characteristic that exhibits an intrinsic peak intensity ratio at two or more wavelengths, and the molecular structure of the rare earth fluorescent complex used, the polymer to be dissolved, and the rare earth fluorescent complex and polymer blend ratio By storing information in advance, it is possible to easily determine whether the peak intensity ratio of the measured sample matches or does not match, and the security is improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Reference Example 10
An image-recorded information recording medium was prepared in the same manner as in Example 1 except that the rare earth fluorescent complex having the molecular structure represented by formula (2) was used instead of the rare earth fluorescent complex represented by formula (5). did. When the peak intensity ratio ^{_{(5 D 0 ⇒ 7 F 2}} ) / (5 D 0 ⇒ 7 F 1) was measured to be 0.20.

Example 11
5 types of security images (true) created using the Eu (III) complex of formula (12) and 1 type of security image (false) created using the Eu (III) complex of formula (5) of Example 1 Were mixed.

  When illuminated with black light, a red light emission image that looks exactly the same was obtained. However, when the peak intensity ratio was measured with the two-wavelength simultaneous detection system, only one type of false image with a peak intensity ratio of 28 was detected.

  DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Image information layer, 3 ... Character information layer, 4 ... Authenticity determination information recording part, 10 ... ID card, 100 ... Authenticity determination system, 102 ... Two wavelength emission intensity measurement part, 103 ... Determination 104, authenticity determination information recording unit

Claims (14)

Excitation light is applied to an information recording medium including a base material and an information recording layer that is provided on the base material and includes a rare earth fluorescent complex represented by the following formula (3) that can exhibit emission intensity peaks at two or more wavelengths. A two-wavelength emission intensity measurement that determines the first emission intensity and the second emission intensity by measuring the emission intensity at a first wavelength and a second wavelength different from the first wavelength in parallel. Part,
A numerical processing unit that receives the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit, and calculates a relative intensity ratio between the first emission intensity and the second emission intensity; And a true / false determination system including a determination unit that compares the relative intensity ratio information sent from the numerical processing unit with the relative intensity ratio information obtained from the authenticity determination information, and performs true / false determination.

(In the formula (3), Ar ¹ and Ar ² may be the same or different aromatic substituents or substituents thereof, and R ³ and R ⁴ may be the same or different, either linear or branched structures. A good alkyl group, an alkoxy group, R ¹ (F) and R ² (F) may be the same or different, at least one of which is a perfluoroalkyl group), n is an integer of 2 or more, Ln (III) is a rare earth ion. )   The system according to claim 1, wherein the emission corresponding to the two or more wavelengths is a center of emission based on at least one magnetic dipole transition and emission based on at least one electric dipole transition.   The system according to claim 1, wherein a true / false determination information recording unit that records the authenticity determination information is provided on the base material. Information recording comprising a base material and a rare earth fluorescent complex represented by the following formula (3), which is provided on the base material and can exhibit a light emission intensity peak at two or more wavelengths, in a two-wavelength emission intensity measurement unit Two wavelengths for irradiating an information recording medium including a layer with excitation light and measuring in parallel the first emission intensity and the second emission intensity at the first wavelength and a second wavelength different from the first wavelength. Measure the emission intensity,
In response to the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit, numerical processing is performed to calculate a relative intensity ratio between the first emission intensity and the second emission intensity. And a true / false determination method including collating the relative intensity ratio information sent from the numerical processing unit with the relative intensity ratio information obtained from the true / false determination information and performing a true / false determination.

(In the formula (3), Ar ¹ and Ar ² may be the same or different aromatic substituents or substituents thereof, and R ³ and R ⁴ may be the same or different, either linear or branched structures. A good alkyl group, an alkoxy group, R ¹ (F) and R ² (F) may be the same or different, at least one of which is a perfluoroalkyl group), n is an integer of 2 or more, Ln (III) is a rare earth ion. ) 5. The method according to claim 4 , wherein the emission corresponding to the two or more wavelengths is a center of emission based on at least one magnetic dipole transition and emission based on at least one electric dipole transition. In response to the result of the true / false determination, the two-wavelength emission intensity measurement, the numerical processing, and the true / false determination are performed again for the same medium, and the obtained true / false determination result and the previous true / false determination result 6. The method according to claim 4 or 5 , wherein collation is performed and a true / false judgment is finally determined based on the match. The method according to any one of claims 4 to 6, wherein a true / false determination information recording unit that records the authenticity determination information is provided on the base material. Further measuring the emission intensity at a third wavelength between the first wavelength and the second wavelength, and comparing with the respective emission intensity at the previous first wavelength and the second wavelength, the determination unit, The method according to any one of claims 4 to 7 , further comprising performing authenticity determination. A substrate, and an information recording unit that is provided on the substrate and contains a rare earth fluorescent complex represented by the following formula (3) that can emit a peak of emission intensity at two or more wavelengths when irradiated with excitation light. To record information.

(In the formula (3), Ar ¹ and Ar ² may be the same or different aromatic substituents or substituents thereof, and R ³ and R ⁴ may be the same or different, either linear or branched structures. A good alkyl group, an alkoxy group, R ¹ (F) and R ² (F) may be the same or different, at least one of which is a perfluoroalkyl group), n is an integer of 2 or more, Ln (III) is a rare earth ion. ) The information recording medium according to claim 9 , wherein the light emission corresponding to the at least two wavelengths includes a light emission based on at least one magnetic dipole transition and a light emission center based on at least one electric dipole transition. Authenticity determination information in which authenticity determination information including two wavelengths at which the peak of the emission intensity of the rare earth fluorescent complex can appear and a relative intensity ratio of each emission intensity at the two wavelengths is recorded on the substrate. the information recording medium according to claim 9 or 10 further comprising a recording unit. Excitation light is applied to an information recording medium including a base material and an information recording layer including a rare earth fluorescent complex represented by the following formula (7), which is provided on the base material and can emit an emission intensity peak at two or more wavelengths. A two-wavelength emission intensity measurement that determines the first emission intensity and the second emission intensity by measuring the emission intensity at a first wavelength and a second wavelength different from the first wavelength in parallel. Part,
A numerical processing unit that receives the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit, and calculates a relative intensity ratio between the first emission intensity and the second emission intensity; as well as
  A true / false determination system including a determination unit that compares the relative intensity ratio information sent from the numerical processing unit with the relative intensity ratio information obtained from the authenticity determination information and performs authenticity determination.

Information recording comprising a base material and a rare earth fluorescent complex represented by the following formula (7), which is provided on the base material and can exhibit a light emission intensity peak at two or more wavelengths, in a two-wavelength emission intensity measurement unit Two wavelengths for irradiating an information recording medium including a layer with excitation light and measuring in parallel the first emission intensity and the second emission intensity at the first wavelength and a second wavelength different from the first wavelength. Measure the emission intensity,
In response to the first emission intensity information and the second emission intensity information from the two-wavelength emission intensity measurement unit, numerical processing is performed to calculate a relative intensity ratio between the first emission intensity and the second emission intensity. ,as well as
  A true / false determination method including collating the relative intensity ratio information sent from the numerical processing unit with the relative intensity ratio information obtained from the authenticity determination information and performing authenticity determination.

A base material and an information recording part containing the rare earth fluorescent complex represented by the following formula (7), which is provided on the base material and can exhibit a peak of emission intensity at two or more wavelengths by irradiation with excitation light. To record information.

Images