CN114806554A - Phosphorescent carbon dot, application thereof in anti-counterfeiting and information encryption and LED lamp bead based on phosphorescent carbon dot - Google Patents
Phosphorescent carbon dot, application thereof in anti-counterfeiting and information encryption and LED lamp bead based on phosphorescent carbon dot Download PDFInfo
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/65—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing carbon
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- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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Abstract
The invention discloses a phosphorescent carbon dot, which is prepared by the following method: 1) mixing vitamin B1 with ethylenediamine for hydrothermal treatment; 2) after the reaction is finished, centrifuging the product, and removing the precipitate to obtain a carbon dot solution; 3) adding boric acid and carrying out hydrothermal treatment; 4) and after the reaction is finished, taking out the solid product, and grinding to obtain white powder, namely the phosphorescent carbon dots. The invention also provides application of the phosphorescent carbon dots in anti-counterfeiting and information encryption and LED lamp beads based on the phosphorescent carbon dots. The phosphorescent carbon dots which can simultaneously show bright blue fluorescence emission and green RTP emission are prepared; the phosphorescence lifetime reaches 293 milliseconds, the macroscopic excellent green afterglow reaches 7.0 seconds, and the phosphorescence quantum yield reaches 12.69%; the invention can provide a green strategy for the extensible synthesis of the RTP carbon dot material, and is a method with great application prospect for manufacturing the RTP material with high efficiency and long afterglow life.
Description
Technical Field
The invention relates to the field of nano materials, in particular to a phosphorescent carbon dot, application of the phosphorescent carbon dot in anti-counterfeiting and information encryption and an LED lamp bead based on the phosphorescent carbon dot.
Background
The Room Temperature Phosphorescence (RTP) material has wide application prospect in the fields of photoelectron, biological imaging, anti-counterfeiting, information encryption and the like due to long service life and large Stokes shift. The most effective RTP materials at present are metal-doped inorganic and organometallic compounds. However, these materials are generally composed of rare metals, are very expensive, are cytotoxic, and are hard and unstable. And the other pure organic RTP material has low intersystem crossing, low preparation efficiency and unsatisfactory effect. Therefore, it is necessary to develop a new metal-free RTP material with low toxicity, environmental protection, long life and low cost.
In recent years, a new type of zero-dimensional carbon nanomaterial, i.e., Carbon Dots (CDs), has attracted great interest due to its low toxicity, biocompatibility, ease of manufacture, and remarkable optical properties. There are currently two main strategies to achieve room temperature phosphorescence of CDs. One approach is to introduce heteroatoms that favor efficient spin-orbit coupling and result in lower singlet-triplet exciton energy gaps. Another approach is to embed the CD in various matrices, such as polyvinyl alcohol, acrylamide, urea, trisodium citrate, aluminum sulfate, zeolites, silica, melamine, and boric acid. It is well known that boron atoms can absorb electrons, thereby reducing the energy gap between singlet and triplet states. Introduction of boric acid in the carbon site facilitates intersystem crossing (ISC) from singlet (S1) to triplet (T1) enhancing phosphorescent emission of triplet excitons. When boric acid is used as a matrix, the generated glassy state may prevent triplet excitons of CD from being non-radiatively consumed. In addition, as an electron-withdrawing atom, the boron atom has an empty p orbital, and can attract transition atoms to form a p conjugate system, so that the energy gap of S1-T1 is reduced, and the rate of ISC is increased. More importantly, the covalent linkage created between the boron and carbon atoms stabilizes the entire system, thereby facilitating RTP emission. Due to these characteristics, boric acid can be used as a substrate for preparing the CD-based RTP material. However, there has been very little research on the use of boric acid as a phosphorescent emissive host, and there is less disclosure of a reliable scheme for preparing CD-based RTP materials using boric acid as a host.
Disclosure of Invention
The invention aims to solve the technical problem of providing a phosphorescent carbon dot, application of the phosphorescent carbon dot in anti-counterfeiting and information encryption and an LED lamp bead based on the phosphorescent carbon dot, aiming at the defects in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: a phosphorescent carbon dot prepared by the following method:
1) adding vitamin B1 into deionized water, then adding ethylenediamine, and placing the obtained mixture into a high-pressure kettle for hydrothermal treatment;
2) after the reaction is finished, cooling to room temperature, centrifuging the product, and removing the precipitate to obtain a carbon dot solution;
3) adding the carbon dot solution obtained in the step 2) into deionized water, adding boric acid, and placing the mixture in a drying box for hydrothermal treatment;
4) and after the reaction is finished, cooling to room temperature, taking out the solid product, and grinding to obtain white powder, namely the phosphorescent carbon dot.
Preferably, in the step 1), the resulting mixture is placed in a stainless steel autoclave lined with polytetrafluoroethylene and subjected to hydrothermal treatment at 180 ℃ for 8 hours.
Preferably, the step 3) is specifically: placing the carbon dot solution obtained in the step 2) in a beaker, then adding ionized water, adding boric acid, taking a piece of tin foil paper to completely cover the beaker, and punching a plurality of holes on the tin foil paper at the position of the beaker mouth; the beaker covered with the tinfoil paper was then placed in a drying oven and hydrothermally treated at 180 ℃ for 5 hours.
Preferably, the phosphorescent carbon dot is prepared by the following method:
1) adding 50mg of vitamin B1 into 10mL of deionized water, then adding 150 μ L of ethylenediamine, placing the obtained mixture in a stainless steel autoclave lined with polytetrafluoroethylene, and performing hydrothermal treatment at 180 ℃ for 8 hours;
2) after the reaction is finished, cooling to room temperature, centrifuging the product at 10000rpm for 10 minutes, and removing the precipitate to obtain a carbon dot solution;
3) putting 100ul of the carbon dot solution obtained in the step 2) into a 30mL beaker, adding 20mL of deionized water, adding 3g of boric acid, taking a piece of tin foil paper to completely cover the beaker, and punching a plurality of holes in the position, positioned at the cup opening of the beaker, on the tin foil paper; then placing the beaker covered with the tin foil paper in a drying box, and carrying out hydrothermal treatment for 5 hours at 180 ℃;
4) and after the reaction is finished, cooling to room temperature, taking out the solid product, and grinding to obtain white powder, namely the phosphorescent carbon dot.
The invention also provides application of the phosphorescent carbon dots, which are applied to anti-counterfeiting and information encryption.
Preferably, the application method of the anti-counterfeiting ink is as follows: the method comprises the following steps of adopting phosphorescent carbon points to draw a characteristic mark, adopting non-phosphorescent carbon points to draw an interference mark, and forming an anti-counterfeiting mark by the characteristic mark and the interference mark; under 365nm exciting light, the characteristic mark displays blue fluorescence, the interference mark displays yellow fluorescence, after the 365nm exciting light is turned off, the characteristic mark displays green fluorescence, and the fluorescence of the interference mark disappears, so that the characteristic mark is used as special information to prevent counterfeiting.
Preferably, the method is applied to information encryption, and the application method comprises the following steps: drawing encrypted information and interference information by adopting phosphorescent carbon points, spraying water in the interference information, and forming an information main body by the encrypted information and the interference information; under 365nm exciting light, the encrypted information displays blue fluorescence, the interference information displays blue fluorescence weaker than the encrypted information, after the 365nm exciting light is turned off, the encrypted information displays green fluorescence, the interference information loses a fluorescence signal due to quenching of the phosphorescent carbon dots by water, and the interference information disappears, so that the encrypted information in the information main body is encrypted and protected.
The invention also provides an LED lamp bead which is prepared from the phosphorescent carbon dots.
Preferably, the preparation method of the LED lamp bead comprises the following steps: and mixing the phosphorescent carbon dot powder with epoxy resin AB glue, placing the mixture at the central position of an ultraviolet LED chip, then placing the mixture in an oven, drying the mixture for 1, and cooling the mixture to room temperature to obtain the LED lamp bead.
Preferably, the preparation method of the LED lamp bead comprises the following steps: and mixing the phosphorescent carbon dot powder with epoxy resin AB glue, placing the mixture at the center of an ultraviolet LED chip, then placing the mixture into an oven, drying the mixture for 1 hour at 100 ℃, and cooling the dried mixture to room temperature to obtain the LED lamp bead.
The invention has the beneficial effects that:
the invention adopts green, environment-friendly and economic vitamin B1 as a basic raw material, and prepares the phosphorescent carbon dots which can simultaneously show bright blue fluorescence emission and green RTP emission by a simple solvothermal method; the phosphorescence lifetime reaches 293 milliseconds, the macroscopic excellent green afterglow reaches 7.0 seconds, and the Phosphorescence Quantum Yield (PQY) reaches 12.69%; the invention can provide a green strategy for the extensible synthesis of the RTP carbon dot material, and is a method with great application prospect for manufacturing the RTP material with high efficiency and long afterglow life;
the phosphorescent carbon dot material provided by the invention can be successfully applied to the fields of anti-counterfeiting and information protection, and the invention further provides an LED lamp bead based on the phosphorescent carbon dot.
Drawings
FIG. 1 is a transmission electron micrograph of a phosphorescent carbon dot prepared in example 1;
FIG. 2 is an X-ray diffraction pattern of phosphorescent carbon dots prepared in example 1;
FIG. 3 is a graph showing an ultraviolet absorption spectrum and a fluorescence spectrum of a phosphorescent carbon dot prepared in example 1;
FIG. 4 is an infrared spectrum of a phosphorescent carbon dot prepared in example 1;
FIG. 5 is an X-ray photoelectron spectrum of a phosphorescent carbon dot prepared in example 1;
FIG. 6 shows fluorescence spectra of phosphorescent carbon dots (liquid state) prepared in example 1 under different excitation lights;
FIG. 7 shows fluorescence spectra of phosphorescent carbon dots (solid state) prepared in example 1 under different excitation lights;
FIG. 8 is a phosphorescence spectrum of the phosphorescent carbon dot prepared in example 1 under different excitation lights;
FIG. 9 is a graph showing the decay of the fluorescence lifetime of the phosphorescent carbon dots prepared in example 1 under 365nm ultraviolet light excitation;
FIG. 10 is a graph showing the decay of the phosphorescence lifetime of the phosphorescent carbon dot prepared in example 1 under 365nm ultraviolet light excitation;
FIG. 11 is a photograph of phosphorescent carbon dots prepared in example 1 with excitation light at 254nm on/off;
FIG. 12 is a photograph of phosphorescent carbon dots prepared in example 1 under 365nm UV light on/off;
FIG. 13 is a CIE chromaticity diagram for the phosphorescent carbon dots prepared in example 1;
fig. 14 is an ultraviolet emission spectrum of the LED lamp bead prepared in example 3;
FIG. 15 is a schematic of a trimodal application of phosphorescent carbon dots prepared in example 1;
FIG. 16 shows an example of the application of the phosphorescent carbon dot prepared in example 1 in anti-counterfeiting;
FIG. 17 shows an example of the application of the phosphorescent carbon dots prepared in example 1 in information encryption;
FIG. 18 is a schematic diagram of the synthesis and application of phosphorescent carbon dots of the present invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
The embodiment provides a phosphorescent carbon dot, which is prepared by using vitamin B1 as a precursor and adopting a two-step solvothermal method, and the method comprises the following specific steps:
1) adding 50mg of vitamin B1 into 10mL of deionized water, then adding 150 μ L of ethylenediamine, placing the obtained mixture in a stainless steel autoclave lined with polytetrafluoroethylene, and performing hydrothermal treatment at 180 ℃ for 8 hours;
2) after the reaction is finished, cooling to room temperature, centrifuging the product at 10000rpm for 10 minutes, and removing non-fluorescent precipitate to obtain a carbon dot solution;
3) putting 100ul of the carbon dot solution obtained in the step 2) into a 30mL beaker, adding 20mL of deionized water, adding 3g of boric acid, completely covering the beaker with a piece of tin foil paper, and punching a plurality of small holes in the position, located at the cup opening of the beaker, on the tin foil paper; then placing the beaker covered with the tin foil paper in a drying box, and carrying out hydrothermal treatment for 5 hours at 180 ℃;
4) after the reaction is finished, cooling to room temperature, taking out the solid product, and grinding to obtain white powder, namely the phosphorescent carbon dot.
Example 2
This example provides the use of the phosphorescent carbon dots of example 1 for security and information encryption applications.
In a preferred embodiment, the phosphorescent carbon dots are applied to anti-counterfeiting, and the application method comprises the following steps: the method comprises the following steps of adopting phosphorescent carbon points to draw a characteristic mark, adopting non-phosphorescent carbon points to draw an interference mark, and forming an anti-counterfeiting mark by the characteristic mark and the interference mark; under 365nm exciting light, the characteristic mark displays blue fluorescence, the interference mark displays yellow fluorescence, after the 365nm exciting light is turned off, the characteristic mark displays green fluorescence, and the fluorescence of the interference mark disappears, so that the characteristic mark is used as special information to prevent counterfeiting.
In a preferred embodiment, the phosphorescent carbon dots are applied to information encryption by the following application method: drawing encrypted information and interference information by adopting phosphorescent carbon points, spraying water in the interference information, and forming an information main body by the encrypted information and the interference information; under 365nm exciting light, the encrypted information displays blue fluorescence, the interference information displays blue fluorescence weaker than the encrypted information, after the 365nm exciting light is turned off, the encrypted information displays green fluorescence, the interference information loses a fluorescence signal due to quenching of the phosphorescent carbon dots by water, and the interference information disappears, so that the encrypted information in the information main body is encrypted and protected.
Example 3
The embodiment provides an LED lamp bead, which is prepared from the phosphorescent carbon dot of the embodiment 1.
The preparation method comprises the following steps: mixing the phosphorescent carbon dot powder as in any one of claims 1-6 with an epoxy resin AB adhesive, placing the mixture at the center of an ultraviolet LED chip, then placing the mixture into an oven, drying the mixture for 1 hour at 100 ℃, and cooling the dried mixture to room temperature to obtain the LED lamp bead. The working voltage of the LED lamp bead is 3.0V.
Example 4
In this embodiment, the phosphorescent carbon dot prepared in embodiment 1 and the LED lamp bead prepared in embodiment 3 are subjected to a relevant performance test, and an example of application of the phosphorescent carbon dot provided in embodiment 2 is provided to further explain the present invention.
1. Referring to fig. 1, which is a transmission electron micrograph of the phosphorescent carbon dots prepared in example 1, it can be seen that the carbon dots are spherical, the crystal lattice is distinct, and the lattice spacing is 0.21 nm.
2. Referring to FIG. 2, which is an X-ray diffraction pattern of the phosphorescent carbon dots prepared in example 1, it can be seen that the X-ray diffraction 2 θ angle of the carbon dots is 14.5 ° ,27.4 ° ,30.2 ° ,and 40.0 ° 。
3. Referring to fig. 3, a graph of the uv absorption spectrum versus the fluorescence spectrum of the phosphorescent carbon dot prepared in example 1, it can be seen that the phosphorescent carbon dot has a maximum absorption band at 220nm, which represents the pi-pi transition of an aromatic C ═ C bond. The weak absorption peaks at approximately 260nm and 322nm are due to N-pi electron transitions, indicating the presence of C ═ N and C ═ O at the surface of the phosphorescent carbon dots. In addition, the fluorescence emission peak of the phosphorescent carbon dot is located at 430nm, and the excitation peak corresponding thereto is located at 365 nm.
4. Referring to fig. 4, the infrared spectrum of the phosphorescent carbon dot prepared in example 1 is analyzed for the intensity of the transmission peak, and the surface of the carbon dot is rich in hydroxyl, amino, and other groups. At 3250cm -1 The characteristic absorption bands on the left and right are due to stretching vibration of-OH groups; at 1484cm -1 The absorption peak of (a) is due to C-N bond stretching vibration; at 1619cm -1 The peak of (a) is caused by stretching vibration belonging to C ═ C; at 1232cm -1 The peak of (A) is considered to be a stretching vibration belonging to the C-O-B bond; at 911cm -1 Is due to the C-B group stretching vibration; these groups demonstrate the presence of boron.
5. Referring to fig. 5, the X-ray photoelectron spectrum of the phosphorescent carbon dot prepared in example 1 shows that the carbon dot is composed of three elements, i.e., carbon, boron and oxygen, in the proportions of 32.18%, 27.45% and 38.3%, respectively.
6. Referring to fig. 6, the fluorescence spectra of the phosphorescent carbon dots (liquid state) prepared in example 1 under different excitation lights show the strongest luminescence at 430nm under 365nm excitation.
7. Referring to FIG. 7, the phosphorescent carbon dots (solid state) prepared in example 1 have a maximum emission at 473nm for their fluorescence spectra under different excitation lights.
8. Referring to FIG. 8, the phosphorescent carbon dots prepared in example 1 have maximum emission at 570nm for phosphorescence spectra under different excitation lights. It can be seen from fig. 6, 7, and 8 that the phosphorescent carbon dots exhibit excitation-dependent characteristics. In conclusion, the phosphorescent carbon dot is an excitation-dependent carbon dot and emits blue fluorescence and green phosphorescence.
9. Referring to fig. 9, a fluorescence lifetime decay curve of the phosphorescent carbon dots prepared in example 1 under 365nm ultraviolet light excitation is fitted, and the fitted lifetime is 5.50 ns.
10. Referring to FIG. 10, a decay curve of phosphorescence lifetime under 365nm ultraviolet light excitation for the phosphorescent carbon dots prepared in example 1 is fitted, and the fitted lifetime is 293 ms.
11. Referring to FIG. 11, a photograph of the phosphorescent carbon dot prepared in example 1 with 254nm excitation light on/off shows that the phosphorescent carbon dot emits bright blue light with 254nm excitation light, and after turning off the light source, the phosphorescent carbon dot still has a light green afterglow visible to the naked eye and the afterglow duration is about 3 s.
12. Referring to fig. 12, which is a photograph of the phosphorescent carbon dot prepared in example 1 under 365nm uv light on/off, the phosphorescent carbon dot fluoresces blue under 365nm uv light excitation, and after the excitation source is removed, a green afterglow visible to the naked eye occurs and lasts for about 7 s. In summary, the phosphorescent carbon dots have triplet properties, and the phosphorescent properties are more stable in the solid state.
13. Referring to fig. 13, a CIE chromaticity diagram of the phosphorescent carbon dots prepared in example 1, fig. 13 shows CIE color coordinates of the LED lamp beads as (0.26, 0.30).
14. Referring to fig. 14, for the ultraviolet emission spectrum of the LED lamp bead prepared in example 3, it can be seen that the LED lamp bead has an Electroluminescence (EL) spectrum in a range of 380 to 750nm, and two independent peaks can be seen in 480nm blue fluorescence and 540nm green phosphorescence emission; under the voltage of 3.0V, the LED lamp beads generate high-efficiency white emission; in addition, when the voltage is turned off, the LED lamp bead shows green phosphorescence.
15. Referring to fig. 15, a schematic of the trimodal application of the phosphorescent carbon dot prepared in example 1 shows that typical trimodal shapes appear under different light conditions by placing the phosphorescent carbon dot prepared in example 1 in a mold: under daylight, the pattern is white; when excited by 365nm ultraviolet light, the pattern emits blue fluorescence; when the uv light is turned off, a bright green pattern appears.
16. Referring to fig. 16, for an application example of the phosphorescent carbon dots prepared in example 1 in anti-counterfeiting, the phosphorescent carbon dots prepared in example 1 are used for drawing characteristic marks (letters U and T), non-phosphorescent carbon dots are used for drawing interference marks (letters S and C), and the characteristic marks and the interference marks form an anti-counterfeiting mark (USTC); under 365nm exciting light, the characteristic marks (letters U and T) display blue fluorescence, the interference marks (letters S and C) display yellow fluorescence, after the 365nm exciting light is turned off, the characteristic marks (letters U and T) display green fluorescence, and the fluorescence of the interference marks letters S and C disappears, so that the characteristic marks (letters U and T) are used as special information to realize anti-counterfeiting.
17. Referring to fig. 17, for an application example of the phosphorescent carbon dots prepared in example 1 in information encryption, encrypted information (letters U and T) and interference information (letters S and C) in which water is sprayed are plotted using the phosphorescent carbon dots prepared in example 1, and the encrypted information and the interference information constitute an information body (USTC); under 365nm exciting light, encrypted information (letters U and T) shows blue fluorescence, interference information (letters S and C) shows the blue fluorescence weaker than the encrypted information, after the 365nm exciting light is turned off, the encrypted information (letters U and T) shows green fluorescence, the interference information (letters S and C) loses fluorescence signals due to quenching fluorescence of phosphorescent carbon spots by water, and the interference information (letters S and C) disappears, so that the encrypted information (letters U and T) in an information main body is encrypted and protected. The result shows that the phosphorescent carbon dots prepared by the invention can provide a powerful tool for the fields of information anti-counterfeiting, protection and the like.
Referring to fig. 18, a schematic diagram of the synthesis and application of the phosphorescent carbon dots of the present invention is shown.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (10)
1. A phosphorescent carbon dot, which is prepared by the following method:
1) adding vitamin B1 into deionized water, then adding ethylenediamine, and placing the obtained mixture into a high-pressure kettle for hydrothermal treatment;
2) after the reaction is finished, cooling to room temperature, centrifuging the product, and removing the precipitate to obtain a carbon dot solution;
3) adding the carbon dot solution obtained in the step 2) into deionized water, adding boric acid, and placing the mixture in a drying box for hydrothermal treatment;
4) and after the reaction is finished, cooling to room temperature, taking out the solid product, and grinding to obtain white powder, namely the phosphorescent carbon dot.
2. The phosphorescent carbon dot of claim 1, wherein in the step 1), the resulting mixture is placed in a stainless steel autoclave lined with polytetrafluoroethylene and subjected to hydrothermal treatment at 180 ℃ for 8 hours.
3. Phosphorescent carbon dot according to claim 2, characterized in that said step 3) is in particular: placing the carbon dot solution obtained in the step 2) in a beaker, then adding ionized water, adding boric acid, taking a piece of tin foil paper to completely cover the beaker, and punching a plurality of holes on the tin foil paper at the position of the beaker mouth; the beaker covered with the tinfoil paper was then placed in a drying oven and hydrothermally treated at 180 ℃ for 5 hours.
4. Phosphorescent carbon dot according to claim 3, characterized in that it is prepared by:
1) adding 50mg of vitamin B1 into 10mL of deionized water, then adding 150 μ L of ethylenediamine, placing the obtained mixture in a stainless steel autoclave lined with polytetrafluoroethylene, and performing hydrothermal treatment at 180 ℃ for 8 hours;
2) after the reaction is finished, cooling to room temperature, centrifuging the product at 10000rpm for 10 minutes, and removing the precipitate to obtain a carbon dot solution;
3) putting 100ul of the carbon dot solution obtained in the step 2) into a 30mL beaker, adding 20mL of deionized water, adding 3g of boric acid, taking a piece of tin foil paper to completely cover the beaker, and punching a plurality of holes in the position, positioned at the cup opening of the beaker, on the tin foil paper; then placing the beaker covered with the tin foil paper in a drying box, and carrying out hydrothermal treatment for 5 hours at 180 ℃;
4) and after the reaction is finished, cooling to room temperature, taking out the solid product, and grinding to obtain white powder, namely the phosphorescent carbon dot.
5. Use of a phosphorescent carbon dot as claimed in any of claims 1 to 4 for forgery prevention and information encryption.
6. The use of phosphorescent carbon dots as claimed in claim 5 for forgery prevention by the method of: the method comprises the following steps of adopting phosphorescent carbon points to draw a characteristic mark, adopting non-phosphorescent carbon points to draw an interference mark, and forming an anti-counterfeiting mark by the characteristic mark and the interference mark; under 365nm exciting light, the characteristic mark displays blue fluorescence, the interference mark displays yellow fluorescence, after the 365nm exciting light is turned off, the characteristic mark displays green fluorescence, and the fluorescence of the interference mark disappears, so that the characteristic mark is used as special information to prevent counterfeiting.
7. Use of a phosphorescent carbon dot according to claim 6 for information encryption by: drawing encrypted information and interference information by adopting phosphorescent carbon points, spraying water in the interference information, and forming an information main body by the encrypted information and the interference information; under 365nm exciting light, the encrypted information displays blue fluorescence, the interference information displays blue fluorescence weaker than the encrypted information, after the 365nm exciting light is turned off, the encrypted information displays green fluorescence, the interference information loses a fluorescence signal due to quenching of the phosphorescent carbon dots by water, and the interference information disappears, so that the encrypted information in the information main body is encrypted and protected.
8. An LED lamp bead prepared by the phosphorescent carbon dot as claimed in any one of claims 1 to 4.
9. The LED lamp bead according to claim 8, characterized in that the preparation method is: mixing the phosphorescent carbon dot powder as claimed in any one of claims 1 to 6 with epoxy resin AB glue, placing the mixture at the center of an ultraviolet LED chip, then placing the mixture into an oven, drying the mixture for 1, and cooling the mixture to room temperature to obtain the LED lamp bead.
10. The LED lamp bead according to claim 9, characterized in that the preparation method is: mixing the phosphorescent carbon dot powder as defined in any one of claims 1 to 6 with an epoxy resin AB adhesive, placing the mixture at the center of an ultraviolet LED chip, then placing the mixture into an oven, drying the mixture for 1 hour at 100 ℃, and cooling the dried mixture to room temperature to obtain the LED lamp bead.
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