Time-temperature indicating label and use thereof

Abstract

The present application belongs to the technical field of cold chain transportation intelligent packaging, and particularly relates to a time-temperature indicating label for monitoring products that need to be transported below room temperature. The time-temperature indicating label has the following characteristics: 1) the label contains long afterglow luminescent materials (including organic long afterglow luminescent materials and inorganic long afterglow luminescent materials) with light energy storage characteristics, the raw materials are cheap, widely sourced and various; 2) the label has simple components, can be synthesized in a wide range, is easy to integrate into traditional hard packaging, or the long afterglow luminescent materials are embedded in a flexible carrier to prepare a flexible label, and can be perfectly compatible with current commercial packaging; 3) the label is convenient to use, quick to identify and reusable. The long afterglow luminescent materials are used to capture the feature that the energy gradually elapses over time, to realize self-evolution intensity attenuation, and to accurately predict the environment and transportation duration experienced by the product during transportation; the time-temperature indicating label has wide application prospects and commercial value in the fields of medical transportation, food transportation and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cold chain transportation intelligent packaging, and particularly relates to a time-temperature indicating label for monitoring products that need to be transported below room temperature. BACKGROUND

[0002] In the commodity circulation link, temperature is usually one of the most difficult factors to control and deeply affects the true quality of commodities. With the improvement of residents' living standards and the gradual attention of consumers to the quality and safety of fresh products and pharmaceuticals, the modern logistics industry, especially the cold chain logistics link, is being paid more and more attention. [Tgab C, et al. Journal of Food Engineering, 2021] In recent years, although the cold chain transportation technology in China has been significantly improved, the overall cold chain loss and corruption rate is still high, and it is still in the initial stage, which cannot meet the demand of the rapidly developing cold chain transportation market. Therefore, dynamic monitoring of product quality during the flow process is very important.

[0003] Time Temperature Indicator (TTI) is considered as an ideal solution to monitor the safety of food, medicine and other products in real time. [Pandian A T, et al. Journal of Food Measurement and Characterization, 2021, 15(2)] As a part of product packaging, it can monitor the temperature change in the transportation link, thereby making up for the problem that the traditional shelf life does not match the actual circulation period, and providing effective basis for retailers and consumers to judge whether the product quality is qualified. Based on the working principle, time temperature indicator can be divided into three types: diffusion type, chemical type and biological type. Diffusion type time temperature indicator uses the diffusion migration of indicator substance on the substrate to play the role of time temperature indication. For example, the hot melt wax diffusion type indicator of 3M company in the United States, when the ambient temperature reaches the working temperature of the indicator, the wax melted by heat will start to flow along the predetermined capillary to realize the indication of time-temperature. Chemical type time temperature indicator indicates the freshness of the product based on the irreversible color change caused by chemical reaction (mainly polymerization reaction). There are relatively many types of such time temperature indicators, which will cause visible color change with the progress of the reaction, and consumers can judge the quality of goods more intuitively. Biological type time temperature indicator mainly indicates through the change of pH color developer caused by the action of biological enzyme and substrate. There are many development and researches around this kind of indicator at home and abroad, and a small number of varieties have been put into commercial use. Although the above three types of time temperature indicators are very beneficial to the circulation of goods and can give consumers information about the actual quality of goods, they are still not widely promoted and applied in China due to factors such as cost benefit, reliability, reusability and so on. SUMMARY

[0004] In view of the shortcomings of the prior art, the purpose of the present application is to provide a novel time-temperature indication label for cold chain transportation and its application, aiming to solve the problem of dynamic monitoring of the quality of cold chain transportation products.

[0005] In order to achieve the above purpose, the present application provides a time-temperature indication label, which comprises a long afterglow luminescent material with light energy storage characteristics and a carrier material.

[0006] The label can release the stored light energy in response to additional thermal stimulation or near-infrared laser stimulation after excitation ends, and respond to the environment synchronously with food, medicine, chemicals and similar products in cold chain transportation. The time-temperature indication label is applied to transport goods in an environment below room temperature.

[0007] Further, the time-temperature indicating module is integrated into the existing commercial packaging for cold chain transportation.

[0008] Further, the trap depth of the long afterglow luminescent material with light energy storage characteristics is 0.1-2.0 eV; and the excitation light source includes ultraviolet light, visible light, X-rays, etc.

[0009] Further, the long afterglow luminescent material with light energy storage characteristics includes one or both of inorganic long afterglow luminescent materials and organic long afterglow luminescent materials.

[0010] Further, the inorganic long afterglow luminescent material is an inorganic fluorescent material doped with rare earth ions, transition metal ions or main group ions and having light energy storage characteristics, and is synthesized by high-temperature solid-phase synthesis, combustion method, hydrothermal method, solvothermal method, etc.

[0011] Taking an inorganic long afterglow fluoride nanomaterial as an example, the chemical formula of the time-temperature indicator of the inorganic long afterglow fluoride nanomaterial is KZn 1-x Mn x F3, wherein x is the molar ratio of Mn 2+ partially replaces Zn 2+ at the octahedral coordination center, and x is 0.5%≤x≤11%. Preferably, the composition of the inorganic long afterglow fluoride nanomaterial is 3%≤x≤5%. The crystal structure of the inorganic long afterglow fluoride nanomaterial belongs to the cubic system. The inorganic long afterglow fluoride nanomaterial needs to be pre-excited by X-rays to store energy before the time-temperature indicating effect can be exhibited.

[0012] A preparation method of an inorganic long afterglow fluoride nanomaterial, comprising the following steps:

[0013] a) K adopts its fluoride, acetate or nitrate as raw material, Zn adopts its acetate or nitrate as raw material, and transition metal Mn ion adopts its nitrate as raw material, and each metal element is weighed according to its stoichiometric ratio, and the ratio of manganese salt to zinc salt is 0.5%≤x≤11%;

[0014] b) the raw materials in step a) are dissolved in a mixed solution of ethanol and water, then oleic acid is added, and stirring and mixing are performed for 0.5-1 hour to form a precursor solution, which is then transferred to a reaction kettle and kept in an oven at 180°C for 12 hours. After reaction, it is naturally cooled to room temperature, and then white powder is obtained after repeated centrifugal washing and drying at 80°C.

[0015] Further, the organic long afterglow luminescent material is a host-guest doped material, the host material is an organic material with carrier transport characteristics, the guest material is a thermally activated delayed fluorescence type organic material, and the frontier molecular orbital energy level of the guest material is contained in the frontier molecular orbital energy level of the host material.

[0016] Further, the organic long afterglow composition is composed of 0.1-50.0% by mass of the guest material and 50.0-99.9% by mass of the host material; and is prepared by a melt-quenching method, a solution processing method or a vacuum vapor deposition method in an oxygen-free environment.

[0017] The host material with carrier transport properties includes, but is not limited to, 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi), 1,3,5-tris[(3-pyridyl)-3-phenyl]benzene (TMPyPB) and the like.

[0018]

[0019] The thermally activated delayed fluorescence type guest material includes, but is not limited to, 4-(6-(4-(9H-carbazol-9-yl)phenyl)-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)benzonitrile (CPN), 4-(6-(4-(diphenylamino)phenyl)-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)benzonitrile (TN) and the like.

[0020]

[0021] The synthesis steps of the time-temperature indicating label prepared by blending and coating include: mixing the inorganic long afterglow nanomaterial and the elastic polymer material uniformly, and coating to prepare a long afterglow fluorescent film.

[0022] The synthesis steps of the time-temperature indicating label prepared by a melt-quenching method on a hard base material include: weighing the host and guest samples according to a specific mass percentage in an oxygen-free glove box, pouring them on a quartz glass sheet, and then placing them on a heating table, heating the samples to 300-400°C, melting the samples, mixing the two molten liquids uniformly, and then rapidly cooling to room temperature to obtain a transparent glassy film. The film is packaged by using an ultraviolet curing adhesive to obtain the target time-temperature indicating label.

[0023] Further, the carrier material can be selected from a hard carrier material or a flexible carrier material.

[0024] The hard carrier material includes a quartz glass template, a metal template, a plastic template and the like; and the hard carrier material fixes the long afterglow luminescent material by packaging.

[0025] The flexible carrier material includes an epoxy resin, an acrylic resin, an amino acrylate material and the like.

[0026] Further, the application of the identification in cold chain transportation specifically comprises the following steps:

[0027] 1) irradiating the identification tag with an excitation light source at a temperature lower than room temperature to perform optical information writing;

[0028] 2) storing at a temperature lower than room temperature, transporting the product requiring cold chain transportation together with the identification tag, and slowly releasing the light energy at a certain rate at the storage temperature;

[0029] 3) after arriving at the destination, removing the tag, heating it to a temperature higher than the storage temperature, or performing light excitation through 760-1500 nm near-infrared light or 380-760 nm visible light, fully releasing the light energy stored in the tag, and reading the released photons using a photodetector to obtain a thermoluminescence curve; obtaining a storage energy intensity value by integrating the area of the thermoluminescence curve, and comparing the storage time with a standard relationship curve of the storage light energy; if the obtained storage light energy intensity value is higher than the corresponding intensity of the standard curve, it is determined that the temperature environment in the cold chain transportation process is qualified; if the obtained storage light energy intensity value is lower than the corresponding intensity of the standard curve, it is determined that the temperature environment in the cold chain transportation process is unqualified, and there is a risk of excessively high temperature.

[0030] The application further provides an application of a time-temperature indication identification in cold chain transportation, specifically comprising the following steps:

[0031] 1) irradiating the identification tag with an excitation light source at a temperature lower than room temperature to perform optical information writing;

[0032] 2) storing at a temperature lower than room temperature, transporting the product requiring cold chain transportation together with the identification tag, and slowly releasing the light energy at a certain rate at the storage temperature;

[0033] 3) the identification releases the stored photons when excited by high-temperature heat or near-infrared light or visible light, and the emission spectrum is obtained through a spectrometer to compare the emission spectrum with a standard emission spectrum; if they are consistent, it is determined that the identification is true; if they are inconsistent, it is determined that the identification is false.

[0034] The stored light energy released under the response of additional heat stimulation or near-infrared laser stimulation is recorded as an emission spectrum by a spectrometer, and is used for identifying the authenticity of the time-temperature indication identification.

[0035] The time-temperature indication identification provided by the application has the following characteristics:

[0036] 1) the identification contains long-afterglow luminescent materials (including organic long-afterglow luminescent materials and inorganic long-afterglow luminescent materials) having light energy storage characteristics, and the raw materials are cheap and widely available in various types;

[0037] 2) The identification component is simple, can be synthesized in a wide range, and can be easily integrated into traditional hard packaging or embedded into a flexible carrier to prepare a flexible identification, which is compatible with the current commercial packaging;

[0038] 3) The identification is convenient to use and quick to identify, and can be reused. The long afterglow luminescent material is used to capture the gradual decline of energy over time to realize self-evolution intensity decay, and the environment experienced by the product during transportation and the transportation time can be accurately predicted. The time-temperature indicating identification has a wide application prospect and commercial value in the field of cold chain transportation. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application or further illustrate the present application by using the drawings, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor.

[0040] Figure 1 The use flowchart of the time-temperature indicating identification;

[0041] The use of the time-temperature indicating identification mainly includes three main steps: 1) optical information writing: the time-temperature indicating agent is excited by ultraviolet-visible light for a period of time under an environment below room temperature, and then attached to the goods to be transported in a cold chain; 2) cold chain transportation and optical information storage; 3) optical information reading.

[0042] Figure 2 The organic long afterglow composition cold chain transportation identification of Example 1 main body: TPBi, guest TN (doping concentration 1wt%) prepared by melt rapid cooling method (a) temperature vs. light intensity thermoluminescence curves at different storage temperatures, (b) temperature vs. light intensity thermoluminescence curves at 250K for different storage times, and (c) intensity integration of the thermoluminescence curves at 250K for different storage times, to obtain the fitting curve of storage time vs. integrated intensity.

[0043] Figure 3 The flexible cold chain transportation identification of Example 2 nanometer fluoride powder prepared by blending coating and scraping method (a) temperature vs. light intensity thermoluminescence curves at different storage temperatures, (b) temperature vs. light intensity thermoluminescence curves at 263K for different storage times, and (c) intensity integration of the thermoluminescence curves at 263K for different storage times, to obtain the fitting curve of storage time vs. integrated intensity. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0045] Embodiment 1:

[0046]

[0047] In an oxygen-free glove box, a sample was weighed according to 1wt% guest TN:99wt% host TPBi, poured onto a quartz glass sheet, and then placed on a heating table. The sample was heated to 350℃, and after the sample was melted, the molten liquids were mixed uniformly, and then rapidly cooled to room temperature to obtain a transparent glassy film, which was the target organic long afterglow composition 1wt% TN@TPBi cold chain transportation identification label.

[0048] As shown in Figure 2 (a), after the identification label was irradiated with 365nm ultraviolet light at 80K, information storage was performed at different temperatures between 100K and 400K for 5 minutes, and then the temperature was raised to 450K to read the thermoluminescence curve. According to the experimental data, the label has excellent optical information storage performance before 250K, and the storage capacity of optical information greatly decreases after 300K. And the storage temperature of 250K(-20℃) is widely used in the transportation temperature of drugs and vaccines, so it is considered that the organic long afterglow composition 1wt% TN@TPBi label has potential application in cold chain transportation.

[0049] Subsequently, as shown in Figure 2 (b), after the identification label was irradiated with 365nm ultraviolet light at 250K, optical information writing was performed; at 250K, storage was performed for 1 hour to 24 hours; and then the temperature was raised to 450K to read the thermoluminescence curve. According to the experimental data, the intensity of thermoluminescence gradually decreases with the increase of storage time. As shown in Figure 2 (c), the fitting of the intensity attenuation of the thermoluminescence curve for 1 hour to 24 hours can draw the fitting curve of storage time and integral intensity and calculate the correlation function, that is, I=0.59exp(-t / 9.34)+0.45.

[0050] In the actual application process of cold chain transport identification tag, when reaching the destination, the tag is removed and heated to 450K, the stored optical information is fully released, and the optical information is read by a photomultiplier tube detector, a thermoluminescence curve of temperature versus light intensity is drawn, and the area of the thermoluminescence curve is integrated to obtain a storage energy intensity value, which is compared with a standard time-storage energy intensity curve. If the obtained storage energy intensity value is on the standard curve, it means that the drug, vaccine and other products that need to be stored below room temperature have not been changed, and it is determined to be qualified. If the obtained storage energy intensity value is below the standard curve, it means that the drug, vaccine and other products that need to be stored below room temperature are exposed to higher temperature during transportation or the transportation time is longer than the rated time, and it is determined to be unqualified. The authenticity of the cold chain transport identification tag can be determined by the specific spectrum emitted by the long afterglow.

[0051] Example 2:

[0052] Under normal temperature and pressure, accurately weigh 4 mmol of zinc acetate and 12 mmol of potassium fluoride in a mixed solution of deionized water and anhydrous ethanol, add appropriate amount of 1 mol / L manganese nitrate solution and oleic acid according to the doping concentration, stir and mix at room temperature, and keep magnetic stirring at a speed of 800 revolutions per minute for 1 hour. The obtained milky white precursor solution is transferred from the beaker to the inner liner of the polytetrafluoroethylene reaction kettle, and the cover is closed. The reaction kettle is placed in a constant temperature drying box and heated to 180℃, and kept for 12 hours. After the reaction is completed, it is naturally cooled to room temperature. The reaction product solution is taken out, centrifuged at 8000 revolutions per minute, and the bottom precipitate is reserved. Repeat the ultrasonic dispersion and centrifugal washing with a mixed solution of ethanol and water three times, and finally dry the obtained product in an oven at 70℃ for 12 hours to obtain long afterglow nano fluorescent powder.

[0053] Weigh 0.2 g of the nano-fluoride powder obtained by the above method into a small beaker, add epoxy resin AB glue (A glue and B glue in a mass ratio of 2:1) according to a certain powder-glue ratio, stir the mixture with a glass rod to fully mix the powder and the flexible carrier material, and use a spatula to evenly coat the mixture on aluminum foil paper. The coated film is transferred to an oven and pre-cured at 80℃ for 1 hour, and then cured at 150℃ for 3 hours to obtain an inorganic long afterglow flexible material time-temperature indicating tag.

[0054] As shown in Figure 3 As shown in (a), after the identification tag is irradiated by X-rays at 263K, the tag stores information at different temperatures within 200K to 450K for 5 minutes, and then the temperature is raised to 550K to read the thermoluminescence curve. According to the experimental data, the tag has excellent optical information storage performance before 275K, and the storage capacity of optical information decreases significantly after 275K. It can be considered that the inorganic long afterglow flexible material KZnF3:Mn tag has application prospects in the circulation of fresh products.

[0055] Subsequently, as Figure 3 shown in (b), at a temperature of 263K, the identification label is irradiated with X-rays for optical information writing; it is stored for 0 to 120 minutes at a temperature of 263K; then the temperature is raised to 550K, and the thermoluminescence curve is read. From the experimental data, it can be obtained that the thermoluminescence intensity decreases with the extension of the storage time. As Figure 3 shown in (c), the integral intensity of the thermoluminescence curve stored for 0 to 120 minutes is fitted with a mathematical function, and the corresponding fitting curve and related function can be plotted, that is, I = 0.23exp(-t / 23.06) + 0.76.

[0056] In the actual application process of the cold chain transportation identification label, when arriving at the destination, the label is removed and heated to 550K to fully release the stored optical information, and the optical information is read with a photomultiplier detector. The thermoluminescence curve of temperature versus light intensity is made, and the area of the thermoluminescence curve is integrated to obtain the stored energy intensity value, and it is compared with the standard curve of storage energy intensity versus time. If the obtained stored energy intensity value is on the standard curve, it means that products such as drugs and vaccines that need to be stored below room temperature have not mutated and are judged to be qualified; if the obtained stored energy intensity value is below the standard curve, it means that products such as drugs and vaccines that need to be stored below room temperature have been exposed to higher temperatures during transportation or the transportation duration is longer than the rated duration, and it is judged to be unqualified. And the authenticity of the cold chain transportation identification label can be determined by the specific spectrum emitted by the long afterglow.

[0057] In summary, the present invention provides a time-temperature indicating label and its application. By replacing the long afterglow luminescent material and selecting different carrier materials, the present invention can realize the preparation of a time-temperature indicating label that can be reused, reliable and stable, and easy to detect. And an application method of this type of time-temperature indicating label in the cold chain transportation field is provided. Through experimental data, it fully demonstrates the feasibility of using the long afterglow luminescent material as a cold chain transportation label and its excellent photophysical properties. It can be foreseen that this type of time-temperature indicating label will have a wide range of applications in the cold chain transportation field.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A time-temperature indicating label, characterized in that, The time-temperature indicating label comprises a long afterglow luminescent material with light energy storage characteristics and a carrier material; the long afterglow luminescent material with light energy storage characteristics comprises an inorganic long afterglow luminescent material selected from inorganic long afterglow fluoride nanomaterials; The label stores a part of light energy after the end of light excitation below room temperature, and releases the stored light energy when activated by high-temperature or near-infrared light or visible light; The time-temperature indicating label is applied to the transportation of cold chain goods below room temperature; The time-temperature indicator chemical formula of the inorganic long afterglow fluoride nanomaterial is KZn 1-x Mn x F3, wherein x is Mn 2+ Partially substituted octahedral coordination center Zn 2+ The molar ratio of x is 0.5%≤x≤11%; the composition of the inorganic long afterglow fluoride nanomaterial is 3%≤x≤5%; the crystal structure of the inorganic long afterglow fluoride nanomaterial belongs to a cubic system; and the inorganic long afterglow fluoride nanomaterial needs to be pre-excited by X-rays to store energy before the time-temperature indication effect can be achieved. The preparation method of the inorganic long afterglow fluoride nanomaterial comprises the following steps: a) K adopts its fluoride, acetate or nitrate as raw material, Zn adopts its acetate or nitrate as raw material, and transition metal Mn ion adopts its nitrate as raw material; each metal element is weighed according to the stoichiometric ratio; the ratio of manganese salt to zinc salt is 0.5%≤x≤11%; b) The raw materials in step a) are dissolved in a mixed solution of ethanol and water, then oleic acid is added, and stirring and mixing are performed for 0.5 to 1 hour to form a precursor solution, which is then transferred to a reaction kettle and kept in an oven at 180℃ for 12 hours. After the reaction, it is naturally cooled to room temperature, and then white powder is obtained after repeated centrifugal washing and drying at 80℃.

2. The time-temperature indicating label according to claim 1, characterized in that The time-temperature indicating label module is integrated into existing commercial packaging for cold chain transportation.

3. The time-temperature indicating label of claim 1, wherein, The trap depth of the long afterglow luminescent material with light energy storage characteristics is 0.1 to 2.0 eV; the excitation light source comprises ultraviolet light, visible light and X-rays.

4. The time-temperature indicating label of claim 1, wherein, The long afterglow luminescent material with light energy storage characteristics further comprises an organic long afterglow luminescent material.

5. The time-temperature indicating label according to claim 4, wherein The inorganic long afterglow luminescent material is a rare earth ion, transition metal ion or main group ion doped inorganic fluorescent material with light energy storage characteristics, which is synthesized by high-temperature solid-phase synthesis, combustion method, hydrothermal method or solvent thermal method.

6. The time-temperature indicating label of claim 4, wherein, The organic long afterglow luminescent material is a host-guest doped material, the host material is an organic material with carrier transport characteristics, and the guest material is a thermally activated delayed fluorescence type organic material; the frontier molecular orbital energy level of the guest material is included in the frontier molecular orbital energy level of the host material.

7. The time-temperature indicating label according to claim 6, characterized in that The organic long afterglow luminescent material composition is composed of 0.1-50.0% guest material and 50.0-99.9% host material; it is prepared by melt quenching method, solution processing method or vacuum vapor deposition method in an oxygen-free environment.

8. The time-temperature indicating label of claim 1, wherein, The carrier material is used to carry or disperse the long afterglow luminescent material, and a hard carrier material or a flexible carrier material can be selected; The hard carrier material comprises quartz glass templates, metal templates and plastic templates; the hard carrier material fixes the long afterglow luminescent material by packaging; The flexible carrier material comprises epoxy resin, acrylic resin and amino acrylate material.

9. The time-temperature indicating label according to any one of claims 1-8 for use in cold chain transportation, comprising the following steps: 1) irradiating the identification label with an excitation light source at a temperature below room temperature to perform optical information writing; 2) at a certain temperature below room temperature, the product requiring cold chain transportation is transported together with the identification tag, and the light energy is slowly released at a certain rate at the storage temperature; 3) after arriving at the destination, the tag is removed and heated to a certain temperature higher than the storage temperature, or photoexcited by 760-1500 nm near-infrared light or 380-760 nm visible light, the stored light energy of the tag is fully released, and the released photons are read by a photodetector to obtain a thermoluminescence curve; the storage energy intensity value is obtained by integrating the area of the thermoluminescence curve, and compared with the standard relationship curve of the storage time for the stored light energy; if the obtained storage light energy intensity value is higher than the corresponding intensity of the standard curve, it is determined that the temperature environment in the cold chain transportation process is qualified; if the obtained storage light energy intensity value is lower than the corresponding intensity of the standard curve, it is determined that the temperature environment in the cold chain transportation process is unqualified, and there is a risk of excessively high temperature.

10. The application of the time-temperature indicating label according to any one of claims 1-8 in cold chain transportation, specifically comprising the following steps: 1) at a certain temperature below room temperature, the identification tag is irradiated by an excitation light source for optical information writing; 2) at a certain temperature below room temperature, the product requiring cold chain transportation is transported together with the identification tag, and the light energy is slowly released at a certain rate at the storage temperature; 3) the label releases the stored photons when excited by high-temperature heat or near-infrared light or visible light, and the emission spectrum is obtained by a spectrometer, and compared with the standard emission spectrum; if they are consistent, it means that the label is true; if they are not consistent, it means that the label is false.

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