Wrinkle-enhanced organic room-temperature phosphorescent material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of synthesis of organic room-temperature phosphorescent materials, and discloses a wrinkle-enhanced organic room-temperature phosphorescent material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a PDMS film with a wrinkle pattern; the preparation method comprises the following steps: blending a monomer A, a monomer B, a monomer C and a boric acid phosphorescent monomer in water, shaking uniformly, adding a photoinitiator into the obtained mixed solution, and shaking or ultrasonically dispersing uniformly to obtain a phosphorescent solution; the method comprises the following steps: cutting two PDMS films with wrinkled patterns to form an upper layer and a lower layer which are parallel to each other, enabling the surfaces, with the wrinkled patterns, of the two PDMS films to be opposite, reserving a cavity between the two PDMS films, sealing the periphery of the cavity with a resin material, injecting a phosphorescent solution into the cavity between the two PDMS films, curing a phosphorescent layer under ultraviolet irradiation, and finally stripping the upper PDMS film and the lower PDMS film to obtain a finished product. The wrinkle-enhanced organic room-temperature phosphorescent material is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of synthesis of organic room temperature phosphorescent materials, and in particular relates to a wrinkle-enhanced organic room temperature phosphorescent material and a preparation method and application thereof. Background Art

[0002] Wrinkles are a common type of surface pattern in nature and in people's daily lives. They are also widely used in many fields of life and industry. Wrinkles have the characteristics of randomness, uncertainty and unpredictability in shape. The wrinkled pattern caused by the mechanical instability of the surface can achieve a high level of security in anti-counterfeiting.

[0003] Room temperature phosphorescence refers to the phenomenon that, at room temperature, triplet excitons slowly decay to singlet states by radiation after being excited by external energy, which is manifested as the continued emission of light for a period of time after the excitation light source is removed. Traditional inorganic room temperature materials have defects such as harsh preparation conditions, high cost, and difficult processing. Organic room temperature phosphorescent materials are simple to prepare, low in cost, and have good biocompatibility. They are widely used in organic optoelectronics, information encryption and anti-counterfeiting, sensing, bioimaging and other fields. In recent years, organic room temperature phosphorescent materials have developed rapidly. People are increasingly exploring various methods that can inhibit non-radiative deactivation pathways and reduce triplet exciton quenching, as well as improve their ISC rate and lifetime. These mainly include eutectic assembly, rigid matrix host-guest systems, structurally modified host-guest systems, and dopant systems.

[0004] However, there are no reports on wrinkle-regulated phosphorescence. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the above-mentioned prior art, the primary purpose of the present invention is to provide a wrinkle-enhanced organic room temperature phosphorescent material; the present invention achieves the regulation of the room temperature phosphorescence intensity of the polyacrylamide composite film by introducing a wrinkle structure, and at the same time, the surface microstructure of the wrinkle-adjusting composite film with different wavelengths and amplitudes is improved to improve its luminous efficiency and lifespan.

[0006] Another object of the present invention is to provide a wrinkle-enhanced organic room temperature phosphorescent material prepared by the above preparation method.

[0007] Another object of the present invention is to provide an application of the above-mentioned wrinkle-enhanced organic room temperature phosphorescent material.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A method for preparing a wrinkle-enhanced organic room temperature phosphorescent material comprises the following steps:

[0010] (1) preparing a PDMS film; cutting the PDMS film and pre-stretching it, then loading a pattern mask on the PDMS film, performing plasma surface treatment in the pre-stretched state, and then releasing the stress to obtain a PDMS film with a wrinkled structural color pattern;

[0011] (2) Mixing monomer A, monomer B, monomer C and boric acid phosphorescent monomer in water, shaking and homogenizing, adding photoinitiator to the obtained mixed solution, shaking or ultrasonically dispersing to obtain a phosphorescent solution;

[0012] (3) Cutting the two PDMS films with the corrugated structural color pattern obtained in step (1) into two parallel layers, the surfaces of the two PDMS films with the corrugated structural color pattern facing each other, leaving a cavity in the middle, and sealing the cavity with a resin material, injecting the phosphorescent solution obtained in step (2) into the cavity in the middle of the two PDMS films, curing the phosphorescent layer under ultraviolet light, and finally peeling off the upper and lower PDMS films to obtain a corrugated enhanced organic room temperature phosphorescent material.

[0013] The preparation of the PDMS film in step (1) is specifically carried out according to the following steps: the transparent silicone rubber and its curing agent are mixed and stirred evenly in a mass ratio of 10:1, then poured onto a flat glass sheet, placed in an oven at 50-90°C for curing for 3-8h to obtain a completely cured PDMS film.

[0014] The cutting in step (1) is to cut the PDMS film into squares with a side length of 3-3.5 cm; the pre-stretching stretching length is 0.5-6.5 mm; the power used in the plasma surface treatment is 50-200 W, and the treatment time is 5-65 min.

[0015] The monomer A in step (2) is acrylic acid, methacrylamide or acrylamide; the monomer B is methyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate or butyl acrylate; the monomer C is N,N'-methylenebisacrylamide (MBAA), ethylene glycol dimethacrylate, 1,4-butanediol diacrylate or 1,6-hexanediol diacrylate; and the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0016] The boric acid phosphorescent monomer in step (2) is phenylboric acid, 1,4-phenyldiboric acid, 4-biphenylboric acid, 1-naphthaleneboric acid, 9-anthraceneboric acid, phenanthrene-9-boric acid, 1-pyreneboric acid or [10-(1-naphthyl)-9-anthracene]boric acid, and has the following structural formulas:

[0017]

[0018] In step (2), the amount of the boric acid phosphorescent monomer added is 0.1-1% of the total mass of the monomer; the amount of the photoinitiator added is 1-2% of the total mass of the monomer.

[0019] In step (2), the mass ratio of monomer A, monomer B, monomer C, boric acid phosphorescent monomer and photoinitiator is 1:0.5:0.01:0.001:0.02.

[0020] The cutting in step (3) is to cut into squares with a side length of 1-2 cm; the wavelength of the ultraviolet light is 365 nm, the intensity of the ultraviolet light is 100-400 w, and the time of the ultraviolet light is 400-2000 s.

[0021] A wrinkle-enhanced organic room temperature phosphorescent material prepared by the above-mentioned preparation method, wherein the phosphorescent material has a phosphorescent lifetime that can be increased to 695ms when the plasma surface treatment power reaches 195W.

[0022] The above-mentioned wrinkle-enhanced organic room temperature phosphorescent material is used in the fields of afterglow imaging, information encryption and anti-counterfeiting.

[0023] Principle of the present invention:

[0024] First, the inventors found that nitrogen plasma treatment (plasma) acts on the PDMS surface and can directly react with the surface, change its surface structure, change the chemical composition of the surface material, introduce other surface functional groups, amino (-NH2) and imino (-NH), so that the PDMS molecular chains on the surface will be cross-linked together, resulting in the formation of a micro-scale dense cross-linked polymer thin layer on the surface. This high Young's modulus glassy thin layer will cause a wrinkled structure after the strain is released. The wrinkled structure can be well adjusted by the plasma treatment power and the pre-stretching amount. When the PDMS loads a pattern mask, the adjustment of the wrinkle pattern can be achieved.

[0025] Then, the inventors also found that the boric acid compound was used as a phosphorescent monomer, and it was doped into the solution. The hydrogel prepared by photoinduced free radical polymerization achieved the aggregation of phosphor molecules and the hydrogen bonding between polymer chains. At the same time, wrinkles can be imprinted on the phosphor layer through the photoinduced curing process.

[0026] The three monomers used in the present invention can undergo free radical polymerization initiated by light under the action of a photoinitiator to obtain a composite film of polyacrylamide. The composite film of polyacrylamide has high mechanical strength, transparency, and good chemical stability, and contains a large number of amide groups and hydroxyl groups on the molecular chain, which can form a polymer network through hydrogen bond interaction to inhibit the movement of phosphors, thereby inhibiting the non-radiative transition of triplet excitons and achieving efficient phosphorescent emission.

[0027] The present invention adopts a boric acid phosphorescent monomer with an addition amount of 0.1-1% of the monomer mass. Only a small amount of phosphor needs to be added to the polymer matrix to achieve long-life and long-afterglow room-temperature phosphorescent emission. The present invention can adjust the phosphorescent lifetime, afterglow time and color by adjusting the doping concentration of the phosphorescent molecules and the types of the phosphorescent molecules.

[0028] Compared with the prior art, the present invention has the following advantages and effects:

[0029] (1) The method of the present invention for preparing a phosphorescent wrinkled phosphor layer by utilizing wrinkles caused by surface mechanical instability and light initiation is simple and easy.

[0030] (2) The phosphorescent pattern prepared by the polymer mechanism of the present invention can be processed by mold to obtain products of any shape; the wrinkle pattern is obtained based on the photomask method to prepare diversified phosphorescent patterns.

[0031] (3) The present invention has developed wrinkles as a new way to enhance phosphorescence, with significant effects. By changing the plasma treatment power and the amount of pre-stretching, the amplitude and wavelength of the wrinkles can be adjusted, and combined with phosphorescence, its luminous efficiency and life can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 These are luminescent photos of the room temperature phosphorescent materials prepared in Examples 1 to 3 before and after the ultraviolet lamp is turned off.

[0033] Figure 2 The steady-state fluorescence and phosphorescence spectra of the room temperature phosphorescent materials prepared in Examples 1 to 3.

[0034] Figure 3 These are luminescent photos of the room temperature phosphorescent materials prepared in Example 2 and Comparative Examples 1 to 3 before and after the ultraviolet lamp is turned off.

[0035] Figure 4 It is the characteristic structure of the unformed wrinkle pattern area and the wrinkle characteristic structure inside the formed wrinkle pattern.

[0036] Figure 5 The characteristic wrinkle structure inside the wrinkle pattern formed by the room temperature phosphorescent materials prepared in Example 2 and Comparative Examples 1 to 3.

[0037] Figure 6 This is the time-resolved emission decay of the room temperature phosphorescent materials prepared in Example 2 and Comparative Examples 1 to 3. DETAILED DESCRIPTION

[0038] The present invention is further described below with reference to specific embodiments, but they should not be construed as limiting the present invention.

[0039] Example 1

[0040] S1. Preparation of a PDMS film with a wrinkled structural color pattern: Add 10g of transparent silicone rubber and 1g of curing agent into a beaker and stir thoroughly. After stirring evenly, pour it on a flat glass sheet and then place it in an oven at 60°C for curing for 4 hours to obtain a completely cured PDMS film; cut the PDMS film into 3cm*3cm and place it on a biaxial stretching instrument for pre-stretching (stretching length is 0.5mm); load the pattern mask on the PDMS to adjust the wrinkle pattern, and then perform plasma surface treatment (plasma treatment, power 135w, 20min) on the film in the stretched state; then release the pressure to obtain a PDMS film with a wrinkled structural color pattern.

[0041] S2. Preparation of phosphorescent solution: Add 1g acrylamide, 0.5g methyl methacrylate, 0.01g ethylene glycol dimethacrylate and 1mg 1-pyreneboronic acid into a 5mL centrifuge tube; add 2mL water and shake to make the solution clear and transparent; finally add 10μL 2-hydroxy-2-methylpropiophenone initiator and shake / ultrasonicate to disperse evenly to obtain a phosphorescent solution.

[0042] S3. Preparation of a phosphorescent layer with wrinkles: two sheets of PDMS films with structural color patterns with wrinkles obtained in step (1) are cut into 2cm*2cm squares and arranged as two parallel layers, the surfaces of the two PDMS films with structural color patterns with wrinkles face each other, leaving a cavity in the middle, and the four sides of the cavity are sealed with resin material, and the phosphorescent solution obtained in step (2) is injected into the cavity in the middle of the two PDMS films, and the phosphorescent layer is cured by irradiating with 200W light for 600s under 360W ultraviolet light, and finally the upper and lower PDMS films are peeled off to obtain a wrinkle-enhanced organic room temperature phosphorescent material.

[0043] Embodiment 2:

[0044] S1. Preparation of a PDMS film with a wrinkled structural color pattern: Add 10g of transparent silicone rubber and 1g of curing agent into a beaker and stir thoroughly. After stirring evenly, pour it on a flat glass sheet and then place it in an oven at 60°C for 4 hours to obtain a completely cured PDMS film; cut the PDMS film into 3cm*3cm and place it on a biaxial stretching instrument for pre-stretching (stretching length is 0.5mm); load the pattern mask on the PDMS to adjust the wrinkle pattern, and then perform plasma treatment on the stretched film (power 135w, 20min); then release the pressure to obtain a PDMS film with a wrinkled structural color pattern.

[0045] S2. Preparation of phosphorescent solution: Add 1g acrylamide, 0.5g methyl methacrylate, 0.01g ethylene glycol dimethacrylate and 1mg [10-(1-naphthyl)-9-anthracene]boric acid into a 5mL centrifuge tube; add 2mL water and shake to make the solution clear and transparent; finally, add 10μL 2-hydroxy-2-methylpropiophenone initiator and shake / ultrasonicate to disperse evenly to obtain a phosphorescent solution.

[0046] S3. Preparation of a phosphorescent layer with wrinkles: two sheets of PDMS films with structural color patterns with wrinkles obtained in step (1) are cut into 2cm*2cm squares and arranged as two parallel layers, the surfaces of the two PDMS films with structural color patterns with wrinkles face each other, leaving a cavity in the middle, and the four sides of the cavity are sealed with resin material, and the phosphorescent solution obtained in step (2) is injected into the cavity in the middle of the two PDMS films, and the phosphorescent layer is cured by irradiating with 200W light for 600s under 360W ultraviolet light, and finally the upper and lower PDMS films are peeled off to obtain a wrinkle-enhanced organic room temperature phosphorescent material.

[0047] Embodiment 3:

[0048] S1. Preparation of a PDMS film with a wrinkled structural color pattern: Add 10g of transparent silicone rubber and 1g of curing agent into a beaker and stir thoroughly. After stirring evenly, pour it on a flat glass sheet and then place it in an oven at 60°C for 4 hours to obtain a completely cured PDMS film; cut the PDMS film into 3cm*3cm and place it on a biaxial stretching instrument for stretching (stretching length is 0.5mm); load the pattern mask on the PDMS to adjust the wrinkle pattern, and then perform plasma treatment on the stretched film (power 135w, 20min); then release the pressure to obtain a PDMS film with a wrinkled structural color pattern.

[0049] S2. Preparation of phosphorescent solution: Add 1g acrylamide, 0.5g methyl methacrylate, 0.01g ethylene glycol dimethacrylate and 1mg phenanthrene-9-boric acid into a 5mL centrifuge tube; add 2mL water and shake to make the solution clear and transparent; finally, add 10μL 2-hydroxy-2-methylpropiophenone initiator and shake / ultrasonicate to disperse evenly to obtain a phosphorescent solution.

[0050] S3. Preparation of a phosphorescent layer with wrinkles: two sheets of PDMS films with structural color patterns with wrinkles obtained in step (1) are cut into 2cm*2cm squares and arranged as two parallel layers, the surfaces of the two PDMS films with structural color patterns with wrinkles face each other, leaving a cavity in the middle, and the four sides of the cavity are sealed with resin material, and the phosphorescent solution obtained in step (2) is injected into the cavity in the middle of the two PDMS films, and the phosphorescent layer is cured by irradiating with 200W light for 600s under 360W ultraviolet light, and finally the upper and lower PDMS films are peeled off to obtain a wrinkle-enhanced organic room temperature phosphorescent material.

[0051] Comparative Example 1:

[0052] S1. Preparation of a PDMS film with a wrinkled structural color pattern: Add 10g of transparent silicone rubber and 1g of curing agent into a beaker and stir thoroughly. After stirring evenly, pour it on a flat glass sheet and then place it in an oven at 60°C for 4 hours to obtain a completely cured PDMS film; cut the PDMS film into 3cm*3cm and place it on a biaxial stretching instrument for stretching (stretching length is 0.5mm); load the pattern mask on the PDMS to adjust the wrinkle pattern, and then release the pressure to obtain a PDMS film with a wrinkled structural color pattern.

[0053] S2. Preparation of phosphorescent solution: Add 1g acrylamide, 0.5g methyl methacrylate, 0.01g ethylene glycol dimethacrylate and 1mg [10-(1-naphthyl)-9-anthracene]boric acid into a 5mL centrifuge tube; add 2mL water and shake to make the solution clear and transparent; finally, add 10μL 2-hydroxy-2-methylpropiophenone initiator and shake / ultrasonicate to disperse evenly to obtain a phosphorescent solution.

[0054] S3. Preparation of a phosphorescent layer with wrinkles: two sheets of PDMS films with structural color patterns with wrinkles obtained in step (1) are cut into 2cm*2cm squares and arranged as two upper and lower parallel layers, the surfaces of the two PDMS films with structural color patterns with wrinkles face each other, leaving a cavity in the middle, and the four sides of the cavity are sealed with resin material, and the phosphorescent solution obtained in step (2) is injected into the cavity in the middle of the two PDMS films, and the phosphorescent layer is cured by irradiating with 200W light for 600s under 360W ultraviolet light, and finally the upper and lower PDMS films are peeled off to obtain a wrinkle-enhanced organic room temperature phosphorescent material.

[0055] Comparative Example 2:

[0056] S1. Preparation of a PDMS film with a wrinkled structural color pattern: Add 10g of transparent silicone rubber and 1g of curing agent into a beaker and stir thoroughly. After stirring evenly, pour it on a flat glass sheet and then place it in an oven at 60°C for 4 hours to obtain a completely cured PDMS film; cut the PDMS film into 3cm*3cm and place it on a biaxial stretching instrument for stretching (stretching length is 0.5mm); load the pattern mask on the PDMS to adjust the wrinkle pattern, and then perform plasma treatment on the stretched film (power 75w, 20min); then release the pressure to obtain a PDMS film with a wrinkled structural color pattern.

[0057] S2. Preparation of phosphorescent solution: Add 1g acrylamide, 0.5g methyl methacrylate, 0.01g ethylene glycol dimethacrylate and 1mg [10-(1-naphthyl)-9-anthracene]boric acid into a 5mL centrifuge tube; add 2mL water and shake to make the solution clear and transparent; finally, add 10μL 2-hydroxy-2-methylpropiophenone initiator and shake / ultrasonicate to disperse evenly to obtain a phosphorescent solution.

[0058] S3. Preparation of a phosphorescent layer with wrinkles: two sheets of PDMS films with structural color patterns with wrinkles obtained in step (1) are cut into 2cm*2cm squares and arranged as two parallel layers, the surfaces of the two PDMS films with structural color patterns with wrinkles face each other, leaving a cavity in the middle, and the four sides of the cavity are sealed with resin material, and the phosphorescent solution obtained in step (2) is injected into the cavity in the middle of the two PDMS films, and the phosphorescent layer is cured by irradiating with 200W light for 600s under 360W ultraviolet light, and finally the upper and lower PDMS films are peeled off to obtain a wrinkle-enhanced organic room temperature phosphorescent material.

[0059] Comparative Example 3:

[0060] S1. Preparation of a PDMS film with a wrinkled structural color pattern: Add 10g of transparent silicone rubber and 1g of curing agent into a beaker and stir thoroughly. After stirring evenly, pour it onto a flat glass sheet and then place it in an oven at 60°C for curing for 4 hours to obtain a completely cured PDMS film; cut the PDMS film into 3cm*3cm and place it on a biaxial stretching instrument for stretching (stretching length is 0.5mm); load the pattern mask on the PDMS to adjust the wrinkle pattern, and then perform plasma treatment on the stretched film (power 195w, 20min); then release the pressure to obtain a PDMS film with a wrinkled structural color pattern.

[0061] S2. Preparation of phosphorescent solution: Add 1g acrylamide, 0.5g methyl methacrylate, 0.01g ethylene glycol dimethacrylate and 1mg [10-(1-naphthyl)-9-anthracene]boric acid into a 5mL centrifuge tube; add 2mL water and shake to make the solution clear and transparent; finally, add 10μL 2-hydroxy-2-methylpropiophenone initiator and shake / ultrasonicate to disperse evenly to obtain a phosphorescent solution.

[0062] S3. Preparation of a phosphorescent layer with wrinkles: two sheets of PDMS films with structural color patterns with wrinkles obtained in step (1) are cut into 2cm*2cm squares and arranged as two parallel layers, the surfaces of the two PDMS films with structural color patterns with wrinkles face each other, leaving a cavity in the middle, and the four sides of the cavity are sealed with resin material, and the phosphorescent solution obtained in step (2) is injected into the cavity in the middle of the two PDMS films, and the phosphorescent layer is cured by irradiating with 200W light for 600s under 360W ultraviolet light, and finally the upper and lower PDMS films are peeled off to obtain a wrinkle-enhanced organic room temperature phosphorescent material.

[0063] Test Example 1:

[0064] 1. Phosphorescence effect diagram

[0065] Experimental steps: Place the room temperature phosphorescent materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3 on an observation table, and use a mobile phone to record and store the video after the vertical ultraviolet light beam is turned off.

[0066] Result analysis: Examples 1 to 3 digital photographs are as follows: Figure 1 As shown in a, b and c, the digital photographic images of Comparative Examples 1 to 3 are as follows Figure 3 As shown in a, b and d, Example 2 is as shown in Figure 3 As shown in c. Figure 1 It can be seen that we use 1-pyreneboronic acid, [10-(1-naphthyl)-9-anthracene]boronic acid and phenanthrene-9-boronic acid phosphors to make "panda" phosphorescent patterns, and can achieve multicolor phosphorescent emission by changing the phosphors in the doped copolymer system. In addition, Figure 1 The phosphorescence efficiency of the patterned area is higher; Figure 3 It can be seen that as the plasma power increases, the phosphorescence efficiency of the area with the "heart" pattern is further improved.

[0067] 2. Laser Confocal

[0068] Experimental steps: Place the room temperature phosphorescent materials prepared in Example 2 and Comparative Examples 1 to 3 on the stage, select a suitable magnification, adjust the brightness and focal length, switch to scanning mode, and obtain a clear confocal image.

[0069] Result analysis: The characteristic structure of the unformed wrinkle pattern area is as follows: Figure 4As shown in a, the characteristic structure inside the wrinkle pattern is as follows Figure 4 As shown in b; the surface morphology of Example 2 is as shown Figure 5 As shown in c, the surface morphology of Comparative Examples 1 to 3 is as follows Figure 5 As shown in a, b and d. Figure 4 and Figure 5 It can be seen that as the plasma power increases, the fold amplitude also increases.

[0070] 3. Fluorescence Spectrometer

[0071] Experimental steps: Place the room temperature phosphorescent materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3 in a sample tank and perform testing using a spectrometer.

[0072] Result analysis: The fluorescence emission and phosphorescence emission spectra obtained in Examples 1 to 3 are as follows Figure 2 The phosphorescence lifetime decay curves of the room temperature phosphorescent materials prepared in Example 2 and Comparative Examples 1 to 3 are shown in FIG. Figure 6 As shown. Figure 2 It can be seen that the fluorescence emission and phosphorescence emission spectra obtained in Examples 1 to 3 are consistent with the photographs thereof; Figure 6 It can be seen that as the plasma power and the corrugation amplitude (A) increase, the phosphorescence lifetime also increases. As the corrugation amplitude increases from 0.02μm to 1.01μm, the phosphorescence lifetime increases from 130ms to 695ms.

[0073] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for preparing a wrinkle-enhanced organic room temperature phosphorescent material, characterized in that The steps include: (1) preparing a PDMS film; cutting the PDMS film and pre-stretching it, then loading a pattern mask on the PDMS film, performing plasma surface treatment in the pre-stretched state, and then releasing the stress to obtain a PDMS film with a wrinkled structural color pattern; (2) Mixing monomer A, monomer B, monomer C and boric acid phosphorescent monomer in water, shaking and homogenizing, adding photoinitiator to the obtained mixed solution, shaking or ultrasonically dispersing to obtain a phosphorescent solution; (3) Cutting the two PDMS films with the corrugated structural color pattern obtained in step (1) into two parallel layers, the surfaces of the two PDMS films with the corrugated structural color pattern facing each other, leaving a cavity in the middle, and sealing the cavity with a resin material, injecting the phosphorescent solution obtained in step (2) into the cavity in the middle of the two PDMS films, curing the phosphorescent layer under ultraviolet light, and finally peeling off the upper and lower PDMS films to obtain a corrugated enhanced organic room temperature phosphorescent material.

2. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: The preparation of the PDMS film in step (1) is specifically carried out according to the following steps: the transparent silicone rubber and its curing agent are mixed and stirred evenly in a mass ratio of 10:1, then poured onto a flat glass sheet, placed in an oven at 50-90°C for curing for 3-8h to obtain a completely cured PDMS film.

3. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: The cutting in step (1) is to cut the PDMS film into squares with a side length of 3-3.5 cm; the pre-stretching stretching length is 0.5-6.5 mm; the power used in the plasma surface treatment is 50-200 W, and the treatment time is 5-65 min.

4. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: The monomer A in step (2) is acrylic acid, methacrylamide or acrylamide; the monomer B is methyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate or butyl acrylate; the monomer C is N,N'-methylenebisacrylamide (MBAA), ethylene glycol dimethacrylate, 1,4-butanediol diacrylate or 1,6-hexanediol diacrylate; and the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

5. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: The boric acid phosphorescent monomer in step (2) is phenylboric acid, 1,4-phenyldiboric acid, 4-biphenylboric acid, 1-naphthaleneboric acid, 9-anthraceneboric acid, phenanthrene-9-boric acid, 1-pyreneboric acid or [10-(1-naphthyl)-9-anthracene]boric acid.

6. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: In step (2), the amount of the boric acid phosphorescent monomer added is 0.1-1% of the total mass of the monomer; the amount of the photoinitiator added is 1-2% of the total mass of the monomer.

7. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: In step (2), the mass ratio of monomer A, monomer B, monomer C, boric acid phosphorescent monomer and photoinitiator is 1:0.5:0.01:0.001:0.

02.

8. The method for preparing a wrinkle-enhanced organic room temperature phosphorescent material according to claim 1, characterized in that: The cutting in step (3) is to cut into squares with a side length of 1-2 cm; the wavelength of the ultraviolet light is 365 nm, the intensity of the ultraviolet light is 100-400 w, and the time of the ultraviolet light is 400-2000 s.

9. A wrinkle-enhanced organic room temperature phosphorescent material prepared by the preparation method according to any one of claims 1 to 8, characterized in that: When the plasma surface treatment power of the phosphorescent material reaches 195W, the phosphorescent life of the phosphorescent material increases to 695ms.

10. Application of the wrinkle-enhanced organic room temperature phosphorescent material according to claim 9 in the fields of afterglow imaging, information encryption and anti-counterfeiting.

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