Method for enhancing light emitting performance of a delayed fluorescence anti-counterfeiting material

Abstract

The application discloses a method for enhancing light-emitting performance of a delayed fluorescence anti-counterfeiting material, and belongs to the technical field of the delayed fluorescence anti-counterfeiting material. The method comprises the following steps: compounding a guest and a hydrophilic polymer, and performing ultraviolet crosslinking after drying; the guest is at least one of 9H-carbazole-2,7-dicarboxylic acid, 9H-carbazole-3,6-dicarboxylic acid, 2,3-quinoline-dicarboxylic acid, 2-2-diquinoline-4-4-dicarboxylic acid, 4,4',4'',4'''-(pyrazino[2,3-g]quinoxaline-2,3,7,8-tetrayl) tetrabenzoic acid, indole-2,5-dicarboxylic acid, 10,15-dihydro-5H-diindolo[3,2-a,3',2'-c]carbazole-3,8,13-tricarboxylic acid, 2,2-bipyridine-5,5-dicarboxylic acid and 2,5-pyrazine dicarboxylic acid. The method can generate room temperature delayed fluorescence by ultraviolet excitation, and the average lifetime and quantum efficiency of the delayed fluorescence anti-counterfeiting material can be up to 1.3 s and 11.5%, respectively. Moreover, the fluorescence lifetime is different under different ultraviolet irradiation times, and the method simultaneously has the characteristics of ultraviolet crosslinking, time effectiveness, delay time, light-emitting intensity and color resolution, so that the method is more conducive to wide application in anti-counterfeiting and light-emitting devices.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of delayed fluorescence anti-counterfeiting materials, and particularly relates to a method for enhancing the light-emitting performance of a delayed fluorescence anti-counterfeiting material. BACKGROUND

[0002] Optical anti-counterfeiting is achieved by encrypting information control through fluorescence and afterglow (phosphorescence or delayed fluorescence) generated by light-emitting functional materials. Most of the reported afterglow anti-counterfeiting materials are inorganic afterglow light-emitting materials. However, the inorganic long afterglow materials have high synthesis cost, low brightness, limited light-emitting color, high toxicity, poor biocompatibility, and the need for the addition of metal elements (rare earth metals, transition metals, etc.), which greatly limits their practical application. Compared with inorganic long afterglow materials, organic long afterglow materials have been widely studied due to their low cost, simple preparation, good biocompatibility, flexibility, easy modification of functional groups, low toxicity, environmental friendliness, and design diversity. However, most of the current organic room-temperature delayed fluorescence light-emitting materials have problems such as harsh synthesis conditions, the presence of heavy metals and halogen atoms, the use of organic solvents with high pollution and high toxicity, the difficulty in processing the product into a shape, and the high price of the synthesized material.

[0003] Polymers have a rigid structure formed by their long chains, which can protect the light-emitting center and shield the air quenching effect. At the same time, polymers have good processing properties, so they have attracted attention in the field of delayed fluorescence light-emitting. However, there are still problems in the research of polymer-based delayed fluorescence light-emitting materials, such as insufficient controllability of the emission wavelength, lifetime, quantum efficiency, and intensity, and insufficient capacity of optical encryption information. Therefore, it is urgent to explore a method for improving the long lifetime, high quantum efficiency, and controllability of intensity of room-temperature delayed fluorescence polymer anti-counterfeiting materials. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the application provides a method for enhancing the light-emitting performance of a delayed fluorescence anti-counterfeiting material.

[0005] To achieve the above-mentioned purposes, the technical solution adopted by the application is as follows:

[0006] A method for enhancing the light-emitting performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps: compounding a guest and a host, and performing ultraviolet crosslinking after drying;

[0007] The guest is at least one of 9H-carbazole-2,7-dicarboxylic acid, 9H-carbazole-3,6-dicarboxylic acid, 2,3-quinoline-dicarboxylic acid, 2-2-diquinoline-4-4-dicarboxylic acid, 4,4`,4``,4```-(pyrazino[2,3-g]quinoxaline-2,3,7,8-tetrayl) tetrabenzoic acid, indole-2,5-dicarboxylic acid, 10,15-dihydro-5H-diindolo[3,2-a,3`,2`-c]carbazole-3,8,13-tricarboxylic acid, 2,2-bipyridine-5,5-dicarboxylic acid, 2,5-pyrazine dicarboxylic acid;

[0008] The host is a hydrophilic polymer.

[0009] The guest and the host are complexed, and after drying, a delayed fluorescence anti-counterfeiting material is obtained.

[0010] As a preferred embodiment of the present application, the host is one or both of polyvinyl alcohol and polyethylene glycol. When the host is polyvinyl alcohol and polyethylene glycol, the polyvinyl alcohol and the polyethylene glycol are mixed in any ratio.

[0011] As a preferred embodiment of the present application, the wavelength of the ultraviolet light used in the ultraviolet crosslinking is 200-380 nm, and more preferably, the wavelength of the ultraviolet light is 365 nm or 254 nm.

[0012] As a preferred embodiment of the present application, the ultraviolet crosslinking time is 0.5-120 min.

[0013] As a preferred embodiment of the present application, the mass ratio of the guest and the host is 1:100-20000.

[0014] As a preferred embodiment of the present application, the mass ratio of the guest and the host is 1:3000-5000.

[0015] As a preferred embodiment of the present application, the method of complexing is mechanical stirring or ultrasonic complexing.

[0016] As a preferred embodiment of the present application, the mechanical stirring method is: dissolving the hydrophilic polymer in water, then adding the guest and mechanically stirring, and the mechanical stirring time is 0.1-3 h.

[0017] As a preferred embodiment of the present application, the ultrasonic complexing method is: dissolving the hydrophilic polymer in water, then adding the guest and ultrasonically oscillating, and the ultrasonic oscillation time is 0.1-2 h.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] (1) The method for enhancing the luminescence performance of delayed fluorescence anti-counterfeiting materials described in this invention involves drying the composite of the object and the subject, followed by excitation with ultraviolet light to generate room temperature delayed fluorescence. The blue delayed fluorescence of the delayed fluorescence anti-counterfeiting material is observed to increase from 0.5 seconds to 3.0 seconds, with an average lifetime and quantum efficiency reaching 1.3 s and 11.5% respectively. Furthermore, delayed fluorescence with different lifetimes appears at different times of ultraviolet irradiation, and it gradually absorbs moisture and becomes inactive upon contact with air, thus achieving a time-limited effect not found in general anti-counterfeiting labels. It also possesses water-based printability, allowing patterns to be obtained through simple aqueous screen printing, thus exhibiting low cost, ease of synthesis, ease of processing, and environmental friendliness. Moreover, it combines ultraviolet crosslinking, time-limited effect, delayed time, luminescence intensity, and color resolution characteristics, making it more suitable for widespread application in anti-counterfeiting and luminescent devices.

[0020] (2) The selection of the guest and the host in the method for enhancing the luminescence performance of delayed fluorescence anti-counterfeiting materials described in this invention is special. Not all hydrophilic polymers and carboxybenzohexacyclic composites can enhance their delayed fluorescence lifetime and quantum efficiency after drying and irradiation with ultraviolet light for a period of time. Attached Figure Description

[0021] Figure 1 The image shows a comparison of the delayed fluorescence duration of the delayed fluorescence anti-counterfeiting material in Example 1 after irradiation with ultraviolet light for 0 min, 5 min, 10 min, and 15 min.

[0022] Figure 2 The image shows a comparison of the fluorescence spectra of the delayed fluorescent anti-counterfeiting material in Example 1 after 5 minutes of ultraviolet light irradiation and after a 1ms delay.

[0023] Figure 3 The image shows the school badge pattern obtained by printing the delayed fluorescence anti-counterfeiting material described in Example 2 onto paper. The left image shows the printed pattern under ultraviolet light, and the right image shows the pattern after the ultraviolet light is turned off.

[0024] Figure 4 The image shows the tiger pattern obtained by printing the delayed fluorescence anti-counterfeiting material described in Example 2 onto paper. The left image shows the printed pattern under ultraviolet light, and the right image shows the pattern after the ultraviolet light is turned off.

[0025] Figure 5 The image shows a comparison of the delayed fluorescence duration of the delayed fluorescence material prepared in Comparative Example 1 after irradiation with 254nm ultraviolet light for 0 min, 10 min, 20 min, 30 min, 40 min, and 50 min. Detailed Implementation

[0026] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0027] Example 1

[0028] A method for enhancing the luminescent performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0029] 1 g of polyvinyl alcohol was dissolved in 20 mL of water, and the mass ratio of 9H-carbazole-2,7-dicarboxylic acid to polyvinyl alcohol was controlled to be 1:3000. The 9H-carbazole-2,7-dicarboxylic acid was added to the polyvinyl alcohol solution and stirred for 0.5 h. After sampling and drying, a delayed fluorescence anti-counterfeiting material was obtained, as shown in Figure 1 The room-temperature delayed fluorescence anti-counterfeiting material exhibited blue fluorescence under a 254 nm ultraviolet lamp, and the blue delayed fluorescence visible to the naked eye lasted only about 0.5 s after the light was turned off. However, after 254 nm ultraviolet light irradiation for 5 min, the blue delayed fluorescence visible to the naked eye lasted as long as 3.0 s, and the average lifetime was 1.3 s and the quantum efficiency was as high as 11.5% detected by a steady-state delayed fluorescence spectrometer. The pattern could not appear delayed fluorescence again under ultraviolet excitation after being placed at room temperature for 24 h. The encapsulated anti-counterfeiting label achieved the purpose of effectively discriminating the true manufacturing time of the product.

[0030] As shown in Figure 2 , the emission spectrum of the fluorescence spectrum and the delayed fluorescence spectrum with a delay time of 1 ms remained basically consistent, proving that the luminescence type of the prepared room-temperature delayed fluorescence anti-counterfeiting material was delayed fluorescence.

[0031] The Kunming University of Science and Technology official website two-dimensional code printed by the material could not be recognized and successfully scanned by a mobile phone under visible light. However, it was clearly visible after ultraviolet irradiation and turning off, and the delayed fluorescence two-dimensional code could successfully jump to the official website interface by scanning with a mobile phone.

[0032] Example 2

[0033] A method for enhancing the luminescent performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0034] 1 g of polyvinyl alcohol was dissolved in 20 mL of water, and the mass ratio of 9H-carbazole-3,6-dicarboxylic acid to polyvinyl alcohol was controlled to be 1:3000. The 9H-carbazole-3,6-dicarboxylic acid was added to the polyvinyl alcohol solution and stirred for 0.5 h. After drying the sample, a delayed fluorescence anti-counterfeiting material was obtained. The room temperature delayed fluorescence anti-counterfeiting material exhibited cyan fluorescence under a 365 nm ultraviolet lamp. After the light source was turned off, cyan delayed fluorescence of the pattern appeared 0.3 s later. The delayed fluorescence anti-counterfeiting material was obtained after the 365 nm ultraviolet lamp was irradiated for 10 min. The afterglow light duration increased from 0.3 s to 2.6 s. The average lifetime was 0.9 s, and the quantum efficiency was as high as 6.1% detected by a steady-state delayed fluorescence spectrometer. The pattern could not appear room temperature delayed fluorescence under ultraviolet excitation after being placed at room temperature for 24 h, so that the anti-counterfeiting label after packaging could achieve the purpose of distinguishing whether the product packaging had been opened. Figure 3 , Figure 4 The luminescence state of the pattern obtained after the delayed fluorescence reagent was printed on paper under excitation of a 365 nm ultraviolet lamp.

[0035] Example 3

[0036] A method for enhancing the luminescence performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0037] 1 g of polyethylene glycol was dissolved in 20 mL of water, and the mass ratio of 9H-carbazole-3,6-dicarboxylic acid to polyethylene glycol was controlled to be 1:4000. The 9H-carbazole-3,6-dicarboxylic acid was added to the polyethylene glycol solution and ultrasonically shaken for 2 h. After drying the sample, a delayed fluorescence anti-counterfeiting material was obtained. The room temperature delayed fluorescence anti-counterfeiting material exhibited green fluorescence under a 254 nm ultraviolet lamp, and the delayed fluorescence was turned off for about 0.3 s. After being irradiated for 15 min under a 254 nm ultraviolet lamp, green delayed fluorescence appeared for 2.4 s after the light was turned off. The average lifetime was 0.9 s, and the quantum efficiency was 5.9% detected by a steady-state delayed fluorescence spectrometer. The pattern could not appear room temperature delayed fluorescence under ultraviolet excitation after being placed at room temperature for 48 h, so that the anti-counterfeiting label after packaging could achieve the purpose of distinguishing whether the product packaging had been opened.

[0038] Example 4

[0039] A method for enhancing the luminescence performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0040] 1 g of polyethylene glycol was dissolved in 20 mL of water, and the mass ratio of 2,3-quinoline-dicarboxylic acid to polyethylene glycol was controlled to be 1:5000. The 2,3-quinoline-dicarboxylic acid was added to the polyethylene glycol solution and stirred for 0.5 h. After drying the sample, a delayed fluorescence anti-counterfeiting material was obtained. The room temperature delayed fluorescence anti-counterfeiting material exhibited green fluorescence under a 254 nm ultraviolet lamp, and the delayed fluorescence lasted for about 0.2 s after the lamp was turned off. After irradiation for 5 min under the 254 nm ultraviolet lamp, green delayed fluorescence with a persistence time of about 1.0 s appeared after the lamp was turned off. The average lifetime was 0.45 s, and the quantum efficiency was 2.8% detected by a steady-state delayed fluorescence spectrometer. The pattern could no longer exhibit room temperature delayed fluorescence under ultraviolet excitation after being placed at room temperature for 36 h, thereby realizing time-dependent room temperature delayed fluorescence anti-counterfeiting after one-time opening.

[0041] Example 5

[0042] A method for enhancing the light-emitting performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0043] 1 g of polyvinyl alcohol was dissolved in 20 mL of water, and the mass ratio of 2-2-diquinoline-4-4-dicarboxylic acid to polyvinyl alcohol was controlled to be 1:1000. The 2-2-diquinoline-4-4-dicarboxylic acid was added to the polyvinyl alcohol solution and stirred for 1 h. After drying the sample, a delayed fluorescence anti-counterfeiting material was obtained. The room temperature delayed fluorescence anti-counterfeiting material exhibited yellow fluorescence under a 365 nm ultraviolet lamp, and the delayed fluorescence lasted for about 0.3 s after the lamp was turned off. After irradiation for 10 min under the 365 nm ultraviolet lamp, yellow delayed fluorescence with a persistence time of 1.9 s appeared after the lamp was turned off. The average lifetime was 0.6 s, and the quantum efficiency was 5.9% detected by a steady-state delayed fluorescence spectrometer. The pattern could no longer exhibit room temperature delayed fluorescence under ultraviolet excitation after being placed at room temperature for 24 h, thereby realizing time-dependent room temperature delayed fluorescence anti-counterfeiting after one-time opening.

[0044] Example 6

[0045] A method for enhancing the light-emitting performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0046] 1g of polyethylene glycol was dissolved in 20mL of water, and the mass ratio of indole-2,5-dicarboxylic acid to polyethylene glycol was controlled at 1:20000. Indole-2,5-dicarboxylic acid was added to the polyethylene glycol solution and ultrasonically vibrated for 1.5h. After sampling and drying, a delayed fluorescence anti-counterfeiting material was obtained. This room temperature delayed fluorescence anti-counterfeiting material exhibited green fluorescence under a 254nm ultraviolet lamp, with a delayed fluorescence of about 0.2s after the lamp was turned off. After 15min of irradiation under a 254nm ultraviolet lamp, a green delayed fluorescence with an afterglow duration of about 1.4s appeared after the lamp was turned off. The average lifetime was 0.61s and the quantum efficiency was 3.4% as detected by a steady-state delayed fluorescence spectrometer. Moreover, the room temperature delayed fluorescence of this anti-counterfeiting material was deactivated after 48h of exposure to air. The encapsulated anti-counterfeiting label can achieve time-limited room temperature delayed fluorescence anti-counterfeiting after one-time opening.

[0047] Example 7

[0048] A method for enhancing the luminescence properties of delayed-fluorescence anti-counterfeiting materials includes the following steps:

[0049] 1g of polyvinyl alcohol was dissolved in 20mL of water, and the mass ratio of 2,2-bipyridine-5,5-dicarboxylic acid to polyvinyl alcohol was controlled at 1:3000. 2,2-bipyridine-5,5-dicarboxylic acid was added to the polyvinyl alcohol solution and stirred for 3 hours. The sample was dried to obtain the delayed fluorescence anti-counterfeiting material. The room temperature delayed fluorescence anti-counterfeiting material exhibited cyan fluorescence under ultraviolet light, and the fluorescence was delayed for about 0.4s after being turned off. After irradiation with a 254nm ultraviolet lamp for 5 minutes, cyan delayed fluorescence appeared for about 1.9s (average lifetime 0.8s, quantum efficiency 2.4%) after the lamp was turned off. Moreover, the room temperature delayed fluorescence anti-counterfeiting material was basically deactivated after being exposed to air for 48 hours. Therefore, the sealed anti-counterfeiting label achieves time-sensitive room temperature delayed fluorescence anti-counterfeiting after one-time opening.

[0050] Example 8

[0051] A method for enhancing the luminescence properties of delayed-fluorescence anti-counterfeiting materials includes the following steps:

[0052] 1g of polyvinyl alcohol was dissolved in 20mL of water, and the mass ratio of 2,5-pyrazine dicarboxylic acid to polyvinyl alcohol was controlled at 1:3000. 2,5-pyrazine dicarboxylic acid was added to the polyvinyl alcohol solution and stirred for 2.0h. After sampling and drying, a delayed fluorescence anti-counterfeiting material was obtained. This room temperature delayed fluorescence anti-counterfeiting material exhibits yellow-green fluorescence under a 254nm ultraviolet lamp. After the lamp is turned off, a delayed fluorescence of about 0.3s will appear. After 20min of irradiation by a 254nm ultraviolet lamp, the afterglow duration of yellow-green delayed fluorescence is about 1.5s. The average lifetime is 0.59s and the quantum efficiency is 5.2% as detected by a steady-state delayed fluorescence spectrometer. After being placed at room temperature for 36h, the pattern can no longer exhibit room temperature delayed fluorescence under ultraviolet lamp excitation, thus achieving time-limited room temperature delayed fluorescence anti-counterfeiting after one-time opening.

[0053] Example 9

[0054] A method for enhancing the luminescent performance of a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0055] 1 g of host molecule hydrophilic polymer (a mixture of polyvinyl alcohol and polyethylene glycol with a mass ratio of 1:1) was dissolved in 20 mL of water, and the mass ratio of guest molecule (a mixture of 9H-carbazole-2,7-dicarboxylic acid and 9H-carbazole-3,6-dicarboxylic acid with a mass ratio of 1:1) to host molecule was controlled to be 1:3000. The guest molecule was added to the host molecule hydrophilic polymer and ultrasonically shaken for 0.5 h. The sample was dried to obtain a delayed fluorescence anti-counterfeiting material. The room temperature delayed fluorescence anti-counterfeiting material exhibited fluorescence under a 365 nm ultraviolet lamp, and about 0.2 s of delayed fluorescence appeared after the light was turned off. About 0.9 s of yellow-green delayed fluorescence appeared after 365 nm ultraviolet irradiation for 10 min. The average lifetime was 0.41 s and the quantum efficiency was 2.2% detected by a steady-state delayed fluorescence spectrometer. The pattern could not appear room temperature delayed fluorescence under ultraviolet excitation after being placed at room temperature for 36 h, thereby realizing the time-dependent room temperature delayed fluorescence anti-counterfeiting after one-time opening.

[0056] Comparative Example 1

[0057] A method for preparing a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0058] 1 g of polyacrylamide was dissolved in 20 mL of water, and the mass ratio of 9H-carbazole-2,7-dicarboxylic acid to polyacrylamide was controlled to be 1:3000. The 9H-carbazole-2,7-dicarboxylic acid was added to the polyacrylamide solution and stirred for 0.5 h. The sample was dried to obtain a room temperature delayed fluorescence anti-counterfeiting material. As shown in FIG. 1, the room temperature delayed fluorescence anti-counterfeiting material exhibited blue fluorescence under a 254 nm ultraviolet lamp, and about 1.5 s of blue delayed fluorescence was visible to the naked eye after the light was turned off. However, there was no obvious change in the luminescent duration when the 254 nm ultraviolet lamp was irradiated for 0-50 min. Figure 5

[0059] Comparative Example 2

[0060] A method for preparing a delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0061] 1 g of polyvinyl alcohol was dissolved in 20 mL of water, and the mass ratio of coumarin-3-carboxylic acid to polyvinyl alcohol was controlled to be 1:3000. The coumarin-3-carboxylic acid was added to the polyvinyl alcohol solution and stirred for 0.5 h. The sample was dried to obtain a room temperature delayed fluorescence anti-counterfeiting material. The room temperature delayed fluorescence anti-counterfeiting material exhibited blue fluorescence under a 254 nm ultraviolet lamp, and about 0.9 s of blue delayed fluorescence was visible to the naked eye after the light was turned off. However, there was no obvious change in the luminescent duration when the 254 nm ultraviolet lamp was irradiated for 0-60 min.​

[0062] Comparative Example 3

[0063] A preparation method of a room temperature delayed fluorescence anti-counterfeiting material, comprising the following steps:

[0064] 1g of polyacrylamide was dissolved in 20mL of water, the mass ratio of quinoline-2-carboxylic acid to polyacrylamide was controlled to be 1:3000, quinoline-2-carboxylic acid was added to the polyacrylamide solution and stirred for 0.5h, and a room temperature delayed fluorescence anti-counterfeiting material was obtained after sampling and drying; the room temperature delayed fluorescence anti-counterfeiting material presented blue fluorescence under a 254nm ultraviolet lamp, and the blue delayed fluorescence visible to the naked eye after the light was turned off was about 2.0s, but the luminescence time length did not change obviously when irradiated by the 254nm ultraviolet lamp for 0-120min.

[0065] Finally, it should be explained that the above examples are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A method for enhancing the luminescence properties of delayed-fluorescence anti-counterfeiting materials, characterized in that, The process includes the following steps: combining the guest and the host, drying them, and then performing ultraviolet crosslinking; The guest is at least one of 9H-carbazole-2,7-dicarboxylic acid, 9H-carbazole-3,6-dicarboxylic acid, 2,3-quinoline-dicarboxylic acid, 2,2'-diquinoline-4,4'-dicarboxylic acid, indole-2,5-dicarboxylic acid, 2,2'-bipyridine-5,5'-dicarboxylic acid, and 2,5-pyrazine-dicarboxylic acid; The main component is one or both of polyvinyl alcohol and polyethylene glycol.

2. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 1, characterized in that, The ultraviolet light wavelength used for the ultraviolet crosslinking is 200-380nm.

3. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 1, characterized in that, The UV crosslinking time is 0.5-120 min.

4. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 1, characterized in that, The mass ratio of the object to the subject is 1:100~20000.

5. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 1, characterized in that, The mass ratio of the object to the subject is 1:3000~5000.

6. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 1, characterized in that, The composite method is either mechanical stirring or ultrasonic composite.

7. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 6, characterized in that, The mechanical stirring method is as follows: the main component is dissolved in water, and then the guest component is added and mechanically stirred for 0.1-3 hours.

8. The method for enhancing the luminescence performance of delayed-fluorescence anti-counterfeiting materials as described in claim 6, characterized in that, The ultrasonic composite method is as follows: the main body is dissolved in water, and then the object is added and ultrasonically vibrated for 0.1-2 hours.

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