阅读说明：本技术 一种荧光材料、荧光材料的制备方法以及防伪膜 (Fluorescent material, preparation method of fluorescent material and anti-counterfeiting film ) 是由 陈广学 钟雨晗 王青 陈奇峰 田君飞 何明辉 于 2019-09-19 设计创作，主要内容包括：本申请涉及材料领域,具体而言,涉及一种荧光材料、荧光材料的制备方法以及防伪膜。荧光材料的制备方法包括：混合稀土氯化物溶液和固含量为1％-2％的含羧基或羰基的纤维素衍生物溶液,在50℃-90℃下反应30min-35min后得到悬浮液。将水溶性氟盐溶液滴加至悬浮液,在50℃-90℃下反应2.5h-4h,然后分离、清洗以及干燥。含羧基或羰基的纤维素衍生物、氟化物以及稀土氯化物均属于环保性原料,在制备方法中得到的副产物氯化物也比较容易处理,制备方法简单、环保。此外,反应条件50℃-90℃,不需要较高或者较低的温度,反应也不需要在高压或者负压环境或者保护气氛中进行,制备条件温和、制备成本低。(The application relates to the field of materials, in particular to a fluorescent material, a preparation method of the fluorescent material and an anti-counterfeiting film. The preparation method of the fluorescent material comprises the following steps: mixing the rare earth chloride solution and a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2 percent, and reacting at the temperature of 50-90 ℃ for 30-35min to obtain a suspension. And dropwise adding the water-soluble fluorine salt solution into the suspension, reacting for 2.5-4h at 50-90 ℃, and then separating, cleaning and drying. Cellulose derivatives containing carboxyl or carbonyl, fluoride and rare earth chloride belong to environment-friendly raw materials, the byproduct chloride obtained in the preparation method is easy to treat, and the preparation method is simple and environment-friendly. In addition, the reaction condition is 50-90 ℃, higher or lower temperature is not needed, the reaction is not needed to be carried out in high-pressure or negative-pressure environment or protective atmosphere, the preparation condition is mild, and the preparation cost is low.)

1. A method for preparing a fluorescent material, which is characterized by comprising the following steps:

Mixing the rare earth chloride solution and a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2%, and reacting at 50-90 ℃ for 30-35min to obtain a suspension;

Dropwise adding a water-soluble fluorine salt solution to the suspension, reacting at 50-90 ℃ for 2.5-4h, and then separating, washing and drying.

2. the method for producing a fluorescent material according to claim 1, wherein the cellulose derivative containing a carboxyl group or a carbonyl group includes sodium carboxymethyl cellulose and/or potassium carboxymethyl cellulose;

Optionally, the water soluble fluoride salt solution comprises sodium fluoride and/or potassium fluoride.

3. The method for producing a fluorescent material according to claim 1 or 2,

The rare earth chloride comprises lanthanum chloride and europium chloride;

Alternatively, the rare earth chloride comprises lanthanum chloride and terbium chloride;

Alternatively, the rare earth chlorides include lanthanum chloride and cerium chloride;

optionally, the rare earth chloride comprises europium ions and lanthanum ions in a mass ratio of 3:7 to 3:3.

4. The method for producing a fluorescent material according to claim 1, wherein the ratio of the amount of the substance of the fluorine salt to the rare earth chloride is 3:1 to 5: 1.

5. The method for producing a fluorescent material according to claim 1, wherein the mass ratio of the rare earth chloride to the cellulose derivative containing a carboxyl group or a carbonyl group is 1:5 to 9: 20.

6. The method for preparing a fluorescent material according to claim 4 or 5, wherein the step of mixing the rare earth chloride solution and the cellulose derivative solution containing a carboxyl group or a carbonyl group with a solid content of 1% to 2% comprises:

And (3) dropwise adding the rare earth chloride solution into the cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2%.

7. A fluorescent material produced by the method for producing a fluorescent material according to any one of claims 1 to 6.

8. a phosphor comprising a chemical composition of CMC/M, wherein CMC is a salt of carboxymethylcellulose and M is a lanthanide nanoparticle covalently linked to said carboxymethylcellulose.

9. The phosphor of claim 8, wherein the chemical composition of the phosphor comprises CMC/LaF₃:Eu³⁺。

10. An anti-counterfeiting film, wherein the anti-counterfeiting film comprises the fluorescent material according to any one of claims 7 to 9.

Technical Field

The application relates to the field of materials, in particular to a fluorescent material, a preparation method of the fluorescent material and an anti-counterfeiting film.

Background

The fluorescent fiber is used as a special fiber which can generate visible light under the excitation of ultraviolet light, so the fluorescent fiber has good anti-counterfeiting effect and can be used as a safety fiber in the fields of anti-counterfeiting labels of products and the like. At present, in the process of manufacturing anti-counterfeiting fibers, fluorescent powder with different colors is mainly added into petroleum-based chemical fibers (polypropylene fibers, polyethylene fibers, polyvinyl chloride fibers, polyester fibers and the like) or plant fibers, and the fluorescent functional fibers are prepared by processes of physical blending, melt extrusion compounding or chemical grafting and the like.

The present application provides a novel material having fluorescent properties and a method for preparing the same.

Disclosure of Invention

An object of the embodiments of the present application is to provide a fluorescent material, a method for preparing the fluorescent material, and an anti-counterfeiting film, which aim to provide a novel fluorescent material and a method for preparing the same.

In a first aspect, the present application provides a method for preparing a fluorescent material, the method comprising:

Mixing the rare earth chloride solution and a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2 percent, and reacting for 30-35min at the temperature of 50-90 ℃ to obtain a suspension.

And dropwise adding the water-soluble fluorine salt solution into the suspension, reacting at 50-90 ℃ for 2.5-4h, and then separating, washing and drying.

Reacting the rare earth chloride with a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2% for 30-35min at 50-90 ℃, so that the cellulose derivative containing carboxyl or carbonyl is covalently bonded with rare earth ions in the rare earth chloride, and the rare earth ions are loaded on the cellulose derivative containing carboxyl or carbonyl in a covalent bond mode. Then the precipitant water-soluble fluorine salt solution reacts with the suspension liquid for 2.5 to 4 hours at the temperature of between 50 and 90 ℃, and rare earth ions are combined with fluorine ions to generate rare earth fluoride; separating, washing and drying to obtain the rare earth fluoride covalently bonded with the cellulose derivative containing carboxyl or carbonyl. The substance has fluorescent properties.

In the method provided by the application, the cellulose derivative containing carboxyl or carbonyl, the fluoride and the rare earth chloride belong to environment-friendly raw materials, the chloride serving as a byproduct obtained in the preparation method is easy to treat, and the preparation method is simple and environment-friendly. In addition, the reaction condition is 50-90 ℃, higher or lower temperature is not needed, the reaction is not needed to be carried out in high-pressure or negative-pressure environment or protective atmosphere, the preparation condition is mild, and the preparation cost is low.

In some embodiments of the first aspect of the present application, the cellulose derivative containing a carboxyl or carbonyl group comprises sodium carboxymethyl cellulose and/or potassium carboxymethyl cellulose.

Optionally, the water soluble fluoride salt solution comprises sodium fluoride and/or potassium fluoride.

When the cellulose derivative containing carboxyl or carbonyl adopts sodium carboxymethyl cellulose or potassium carboxymethyl cellulose, the finally obtained fluorescent material not only has the fluorescent characteristic, but also is transparent under natural light, so that the application of the fluorescent material can be increased.

In some embodiments of the first aspect of the present application, the rare earth chloride comprises lanthanum chloride and europium chloride;

Alternatively, rare earth chlorides include lanthanum chloride and terbium chloride;

alternatively, rare earth chlorides include lanthanum chloride and cerium chloride.

in some embodiments of the first aspect of the present application, the rare earth chloride comprises europium ions and lanthanum ions in a mass ratio of 3:3 to 3: 7.

in some embodiments of the first aspect of the present application, the ratio of the amount of species of fluoride salt to rare earth chloride is 3:1 to 5: 1.

The mass ratio of the fluoride salt to the rare earth chloride is 3:1 to 5: within 1, the utilization rate of the two can be increased.

In some embodiments of the first aspect of the present application, the mass ratio of the rare earth chloride to the cellulose derivative containing a carboxyl or carbonyl group is from 1:5 to 9: 20.

The mass ratio of the rare earth chloride to the cellulose derivative containing carboxyl or carbonyl is in the above range, so that the loading rate of the rare earth chloride can be improved, and the conversion rate can be increased.

In some embodiments of the first aspect of the present application, the step of mixing the rare earth chloride solution and the carboxyl-or carbonyl-containing cellulose derivative solution having a solids content of 1% to 2% comprises:

and (3) dropwise adding a rare earth chloride solution into a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2%.

The rare earth chloride solution is added into the cellulose derivative solution containing carboxyl or carbonyl in a dropwise manner, so that rare earth ions are favorably grafted to the cellulose derivative containing carboxyl or carbonyl.

In a second aspect, the present application provides a fluorescent material, which is prepared by the method for preparing the fluorescent material provided in the first aspect.

The fluorescent material provided by the application has strong fluorescence intensity, is good in flexibility, and can be used for functional packaging materials or anti-counterfeiting materials and the like.

in a third aspect, the present application provides a phosphor having a chemical composition comprising CMC/M, wherein CMC is a salt of carboxymethyl cellulose and M is a lanthanide nanoparticle covalently linked to the carboxymethyl cellulose.

the chemical components of the fluorescent material comprise CMC/M, carboxymethyl cellulose macromolecules with good biocompatibility and biodegradability are introduced into the rare earth composite luminescent material, and the obtained fluorescent material has the fluorescent characteristic and also has the transparent characteristic, so that the application of the fluorescent material is increased.

In some embodiments of the third aspect of the present application, the chemical composition of the phosphor comprises CMC/LaF₃:Eu³⁺。

The fourth aspect of the present application provides an anti-counterfeiting film, which comprises the fluorescent material provided by the third aspect of the present application or the second aspect of the present application.

The fluorescent material can be made into an anti-counterfeiting film, the anti-counterfeiting film has a fluorescent characteristic, the fluorescent material is good in stability, and the service time of the anti-counterfeiting film is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a simplified flow chart of a method for producing a phosphor according to an embodiment of the present disclosure;

FIG. 2 shows a scanning electron micrograph of the fluorescent material prepared in example 1;

Fig. 3 shows a scanning electron micrograph of sodium carboxymethylcellulose.

Fig. 4 shows an infrared spectrum of the fluorescent material prepared in this example and carboxymethyl cellulose.

FIG. 5 shows a scanning electron micrograph of the fluorescent material prepared in example 2;

FIG. 6 shows a scanning electron micrograph of the fluorescent material prepared in example 3;

FIG. 7 shows a scanning electron micrograph of the fluorescent material prepared in example 4;

FIG. 8 shows a scanning electron micrograph of the fluorescent material prepared in example 5.

FIG. 9 shows an optical diagram of the fluorescent material prepared in this example;

FIG. 10 is a graph showing fluorescence spectra of the fluorescent materials prepared in examples 1 to 5;

fig. 11 shows XPS spectra of CMC and the phosphor provided in example 1.

Fig. 12 shows XRD patterns of the fluorescent materials of examples 1, 2, 5.

Fig. 13 shows thermogravimetric analysis graphs of CMC and the fluorescent materials provided in examples 1, 2, and 5.

Fig. 14 shows stress-strain plots of CMC and phosphor materials provided in examples 1, 2, and 5.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In embodiments of the present application, the "and/or" means that both features before and/or after "may be included, or that only the features before" and/or "may be included, or that only the features after" and/or "may be included.

For example: cellulose derivatives containing carboxyl or carbonyl groups include sodium carboxymethyl cellulose and/or potassium carboxymethyl cellulose; represents: the cellulose derivative containing a carboxyl group or a carbonyl group includes sodium carboxymethylcellulose, or the cellulose derivative containing a carboxyl group or a carbonyl group includes potassium carboxymethylcellulose, or the cellulose derivative containing a carboxyl group or a carbonyl group includes sodium carboxymethylcellulose and potassium carboxymethylcellulose.

The following is a detailed description of the fluorescent material and the method for preparing the same in the examples of the present application.

The preparation method of the fluorescent material comprises the following steps:

Mixing the rare earth chloride solution and a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2 percent, and reacting for 30-35min at the temperature of 50-90 ℃ to obtain a suspension.

And dropwise adding the water-soluble fluorine salt solution into the suspension, reacting at 50-90 ℃ for 2.5-4h, and then separating, washing and drying.

In the application, the rare earth chloride reacts with a cellulose derivative solution containing carboxyl or carbonyl with the solid content of 1-2% for 30-35min at 50-90 ℃, so that the cellulose derivative containing carboxyl or carbonyl is covalently bonded with rare earth ions in the rare earth chloride, and the rare earth ions are supported on the cellulose derivative containing carboxyl or carbonyl in a covalent bond mode. Then reacting the precipitant water-soluble fluorine salt solution with the suspension liquid at 50-90 ℃ for 2.5-4h, and combining rare earth ions with fluorine ions to generate rare earth fluoride; separating, washing and drying to obtain the rare earth fluoride covalently bonded with the cellulose derivative containing carboxyl or carbonyl. The substance has fluorescent properties.

in the method provided by the application, the cellulose derivative containing carboxyl or carbonyl, the fluoride and the rare earth chloride belong to environment-friendly raw materials, the chloride serving as a byproduct obtained in the preparation method is easy to treat, and the preparation method is simple and environment-friendly. In addition, the reaction condition is 50-90 ℃, higher or lower temperature is not needed, the reaction is not needed to be carried out in a high-pressure or negative-pressure environment or protective atmosphere, the preparation condition is mild, and the preparation cost is low.

Referring to the following as an example of the method for preparing the fluorescent material provided in the embodiments of the present application, fig. 1 shows a schematic flow chart of the method for preparing the fluorescent material provided in the embodiments of the present application, and please refer to fig. 1.

The preparation method of the fluorescent material comprises the following steps:

Step S1: preparing a solution of a cellulose derivative containing a carboxyl group or a carbonyl group; the method specifically comprises the following steps: dissolving a proper amount of cellulose derivative containing carboxyl or carbonyl in quantitative deionized water, stirring by using a glass rod to obtain a cellulose derivative solution containing 1-2% of carboxyl or carbonyl in solid content, pouring the cellulose derivative solution into a round-bottom flask, heating at 50-90 ℃, and stirring for 30-50 min.

In this example, the cellulose derivative solution containing a carboxyl group or a carbonyl group was carried out in an oil bath at 50 to 90 ℃.

the temperature in step S1 may be 50 deg.C, 55 deg.C, 59 deg.C, 64 deg.C, 71 deg.C, 78 deg.C, 84 deg.C or 90 deg.C. Further, the heating time may be 30min, 31min, 33min, 35min, 39min, 42min, 46min, 50min, or the like.

Further, the solid content of the cellulose derivative solution containing a carboxyl group or a carbonyl group may be 1%, 1.2%, 1.5%, 1.6%, 1.8%, 2%, or the like.

further, in the present application, the cellulose derivative containing a carboxyl group or a carbonyl group is selected from at least one of sodium carboxymethyl cellulose or potassium carboxymethyl cellulose.

In the embodiment of the application, when the cellulose derivative containing carboxyl or carbonyl is sodium carboxymethyl cellulose or potassium carboxymethyl cellulose, the finally obtained fluorescent material not only has the fluorescent characteristic, but also is transparent under natural light, so that the application of the fluorescent material can be increased.

In other embodiments of the present application, the cellulose derivative having a carboxyl group or a carbonyl group may be selected from other cellulose derivatives having a carboxyl group or a carbonyl group, such as hydroxypropylmethyl cellulose.

In other embodiments of the present application, other methods may be used to prepare the cellulose derivative solution containing carboxyl or carbonyl groups; or a cellulose derivative solution containing a carboxyl group or a carbonyl group can be purchased or the like.

Step S2: preparing a solution of rare earth chloride; the method specifically comprises the following steps: weighing a certain amount of rare earth chloride, dissolving in a proper amount of deionized water, and uniformly mixing.

The rare earth chloride solution is an aqueous solution containing rare earth chloride, and further, the rare earth chloride is water-soluble rare earth chloride or a hydrate of the rare earth chloride. For example, rare earth chloride solutions are prepared by dissolving in water one or more of the following: lanthanum chloride, terbium chloride, europium chloride, cerium chloride, europium chloride hexahydrate, cerium chloride hexahydrate, terbium chloride hexahydrate, or the like.

Further, in the present embodiment, the rare earth chloride includes lanthanum chloride and europium chloride.

Alternatively, in some other embodiments of the present application, the rare earth chloride comprises lanthanum chloride and terbium chloride.

Alternatively, in some other embodiments of the present application, the rare earth chloride includes lanthanum chloride and cerium chloride.

Further, in the present embodiment, the rare earth chloride includes europium ions and lanthanum ions in a mass ratio of 3:7 to 3:3. For example, the mass ratio of europium ions to lanthanum ions is 3:3, 3:3.5, 3:4, 3:4.2, 3:5, 3:5.6, 3:6, 3:6.7, or 3:7, etc.

In other embodiments of the present application, the mass ratio of the europium ion to the lanthanum ion may be other values, for example, 3:2, 3:10, and the like.

Step S3: mixing a rare earth chloride solution and a cellulose derivative solution containing a carboxyl group or a carbonyl group; keeping the temperature at 50-90 ℃ and reacting for 30-35min under stirring to obtain suspension. In this example, a rare earth chloride solution was dropwise added to a cellulose derivative solution containing a carboxyl group or a carbonyl group. The rare earth chloride solution is added into the cellulose derivative solution containing carboxyl or carbonyl in a dropwise manner, so that rare earth ions are favorably grafted to the cellulose derivative containing carboxyl or carbonyl. In other embodiments of the present application, the two can be directly mixed by direct mixing.

further, in the examples of the present application, the reaction temperature of step S3 may be 50 ℃, 55 ℃, 59 ℃,64 ℃, 71 ℃, 78 ℃, 84 ℃, or 90 ℃ or the like. Further, the reaction time may be 30min, 31min, 33min, 35min, or the like.

Illustratively, in the present embodiment, the mass ratio of the rare earth chloride to the cellulose derivative containing a carboxyl group or a carbonyl group is 1:5 to 9: 20. The mass ratio of the rare earth chloride to the cellulose derivative containing a carboxyl group or a carbonyl group is, for example, 1:5, 1:6, 3:10, 2:5, 9:20, or the like.

the mass ratio of the rare earth chloride to the cellulose derivative containing carboxyl or carbonyl is in the above range, so that the loading rate of the rare earth chloride can be improved, and the conversion rate can be increased. In other embodiments of the present application, the mass ratio of rare earth chloride to cellulose derivative containing carboxyl or carbonyl groups may also be less than 1:5 or greater than 9: 20; for example, 1:6, 1:7, or 1:2, 3:4, etc.

Step S4: dropwise adding a fluorine salt solution into the suspension; reacting for 2.5-4h at 50-90 ℃.

And (3) dropwise adding a fluorine salt solution into the suspension, and generating precipitates by rare earth ions and fluorine ions grafted on the cellulose derivative containing carboxyl or carbonyl. In the present embodiment, the dropping time of the fluorine salt solution to the suspension is 30 to 35min, and may be, for example, 30min, 31min, 33min, or 35 min.

In this embodiment, the concentration of the fluorine salt solution is 0.31 wt%, and the concentration of the fluorine salt solution is not limited in this application, and may be, for example, 0.31 wt% to 0.56 wt%, or specifically selected according to the nature of the fluorine salt.

Further, in the present embodiment, the ratio of the amount of the substance of the fluorine salt to the rare earth chloride is 3:1 to 5: 1. for example, the ratio of the amount of species of fluoride salt to rare earth chloride is 5:1, 4:1, 4.5:1, 3.6:1, or 3:1, etc. The mass ratio of the fluorine salt to the rare earth chloride is 5: in the range of 1 to 3:1, the utilization of both can be increased, in other embodiments of the present application, the ratio of the amount of the species of fluoride salt to rare earth chloride can be other values, such as less than 3:1 or greater than 5:1, such as 2:1 or 5.5:1, etc., regardless of the yield.

Further, in embodiments of the present application, the water-soluble fluoride salt solution includes sodium fluoride and/or potassium fluoride. For example, water-soluble fluoride salt solutions include sodium fluoride; or the water soluble fluoride salt solution comprises potassium fluoride; or the water soluble fluoride salt solution comprises sodium fluoride and potassium fluoride.

In other embodiments of the present application, the water soluble fluoride salt solution may also include other water soluble fluoride salts.

In this embodiment, the reaction temperature in step S4 is in the range of 50-90 ℃, for example, 50 ℃, 55 ℃, 59 ℃,64 ℃, 71 ℃, 78 ℃, 84 ℃ or 90 ℃. Further, the reaction time may be 2.5 to 4 hours. For example, the reaction time may be 2.5h, 2.7h, 2.9h, 3.0h, 3.2h, 3.6h, or 4 h.

Step S5: filtering, cleaning and then drying the reaction liquid obtained in the step S4; the method specifically comprises the following steps: centrifuging the reaction solution at 3000-60000 rpm for 2-5min, washing with deionized water for three times, and drying in an oven at 50-70 deg.C. Further, the drying temperature may be 50 ℃, 62 ℃, or 70 ℃. The drying can also be carried out by vacuum drying.

In this example, the above steps S1-S4 were all carried out in an oil bath at 50-90 ℃. In this embodiment, step S1 is not in sequence with step S2. Further, in other embodiments, the solutions in steps S1 and S2 may be configured in other ways, or obtained by direct purchase.

The preparation method of the fluorescent material provided by the embodiment of the application has at least the following advantages:

the biodegradable and environment-friendly cellulose derivative is used as a carrier, the material with the fluorescent characteristic is prepared simply, efficiently and greenly, and the problems in the existing synthetic fiber anti-counterfeiting material are hopefully solved by researching the modification of the rare earth on the surface of the carboxymethyl cellulose. In the embodiment where the cellulose derivative containing carboxyl and carbonyl is sodium carboxymethyl cellulose or potassium carboxymethyl cellulose, the prepared fluorescent material is a transparent material.

The application also provides a fluorescent material, and the fluorescent material is prepared by the preparation method of the fluorescent material.

The fluorescent material provided by the application has strong fluorescence intensity, is good in flexibility, and can be used for functional packaging materials or anti-counterfeiting materials and the like.

Further, the application also provides a fluorescent material, and the chemical composition of the fluorescent material comprises CMC/M, wherein CMC (carboxyl Methyl Cellulose) is carboxymethyl Cellulose salt, M is rare earth fluoride, and the rare earth fluoride is connected with carboxymethyl Cellulose by means of covalent bond.

In CMC/M "/" means loaded; m is lanthanide nanoparticle CMC is carboxymethyl cellulose salt. Further, the lanthanide nanoparticles may include LaF₃：Eu³⁺Or LaF₃：Te³⁺Or LaF₃：Se³⁺One or more of the above. The lanthanide nanoparticles are covalently linked to the carboxymethyl cellulose.

The chemical components of the fluorescent material comprise CMC/M, carboxymethyl cellulose macromolecules with good biocompatibility and biodegradability are introduced into the rare earth composite luminescent material, and the obtained fluorescent material has the fluorescent characteristic and also has the transparent characteristic, so that the application of the fluorescent material is increased.

Further, in some embodiments of the present application, the chemical composition of the phosphor material includes CMC/LaF₃:Eu³⁺。

The application also provides an anti-counterfeiting film which comprises the fluorescent material.

In the embodiments of the present application, the anti-counterfeiting film can be made into various shapes and different marks, such as a hollowed pattern, a hollowed text or a whole film. For example, the anti-counterfeiting film can also be a pattern which is drawn by lines with certain thickness.

The fluorescent material can be made into an anti-counterfeiting film, the anti-counterfeiting film has a fluorescent characteristic, the fluorescent material is good in stability, and the service time of the anti-counterfeiting film is prolonged.

The features and properties of the present application are described in further detail below with reference to examples.