Three-component luminescent covalent organic framework materials based on white light emission, and preparation method and application thereof

Abstract

The application belongs to the technical field of material chemistry, and particularly relates to a three-component light-emitting covalent organic framework material based on white light emission and a preparation method and application thereof. The chemical structure of the three-component light-emitting covalent organic framework material is as follows; based on the synthesis of COF, the three-component covalent organic framework material emitting white light is prepared by controlling the monomer ratio and the excitation wavelength, and the three-component COFs realize unique and rich light-emitting behaviors. Since COF-BTDD0 is blue fluorescence, and COF-BTDD 100 is yellow fluorescence, from the CIE chromaticity coordinates, the line connecting COF-BTDD0 and COF-BTDD 100 will pass through the white light coordinate, therefore, by adopting the three-component strategy, the obtained COFs simultaneously contain the fluorescence properties of COF-BTDD0 and COF-BTDD 100 , and then by changing the ratio of 1,4-bis(4-formylphenyl)benzene (TD) and (2,7-diphenylformaldehyde-benzothiadiazole) BTDD and the excitation wavelength, white light emission is realized.

Description

Technical Field

[0001] This invention belongs to the field of materials chemistry, specifically relating to a three-component luminescent covalent organic framework material based on white light emission, its preparation method, and its applications. Background Technology

[0002] White light emission is a luminescent phenomenon widely used in lighting and display fields. Traditional luminescent materials typically emit only monochromatic light of a specific wavelength, requiring the mixing of multiple materials of different colors to achieve white light emission. This not only increases manufacturing costs but also leads to problems such as light loss and color inhomogeneity. The important role of white light emitting materials lies in their ability to solve the problems of color inhomogeneity and light loss inherent in traditional luminescent materials, thus offering broader application prospects. Materials capable of achieving white light emission will bring tremendous impetus and opportunities to the development of lighting, displays, biomedicine, optoelectronics, photocatalysis, and other fields. Therefore, the development of a white light emitting material is of great significance. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-component luminescent covalent organic framework material based on white light emission, its preparation method, and its application. Specifically, the following technical solution is adopted: A three-component luminescent covalent organic framework material based on white light emission, the chemical structure of which is as follows: ; where TD is 1,4-bis(4-aldehydephenyl)benzene, CPTDD is 1,3,5-tris(4-cyanomethylbenzene)benzene, and BTDD is 2,7-dibenzaldehyde-benzothiadiazole.

[0004] This invention also provides a method for preparing a three-component luminescent covalent organic framework material based on white light emission, specifically including the following steps: S1: CPTDD, BTDD and TD are dissolved together in a mixed solvent and then subjected to ultrasonic treatment to obtain a mixed solution; the mixed solvent is obtained by mixing mesitylene and 1,4-dioxane. S2: After adding NaOH solution to the mixed solution, seal it and perform vacuum deoxygenation. Then, heat the reaction under vacuum for 72 h at a temperature of 120℃. After the reaction is completed, cool it to room temperature, centrifuge it, and obtain the precipitate. S3: The precipitate was washed with solvent, centrifuged, dried, and ground to finally obtain a three-component luminescent covalent organic framework material.

[0005] This invention, based on the synthesis of COFs, prepares three-component covalent organic framework materials that emit white light by controlling the monomer ratio and excitation wavelength. The three-component COFs exhibit unique and diverse luminescent behaviors. Since COF-BTDD0 exhibits blue fluorescence, while COF-BTDD... 100 It exhibits yellow fluorescence; according to the CIE chromaticity coordinates, COF-BTDD0 and COF-BTDD... 100 The connection will pass through the white light coordinates; therefore, by adopting a three-component strategy, the obtained COFs simultaneously contain COF-BTDD0 and COF-BTDD0. 100 The fluorescence properties were then investigated, and white light emission was achieved by changing the ratio of 2,7-dibenzaldehyde-benzothiadiazole (BTDD) and 1,4-bis(4-aldehydephenyl)benzene (TD) and by changing the excitation wavelength.

[0006] As a further preferred embodiment, [CPTDD]:[BTDD]+[TD]=2:3, [TD]:[BTDD]=2:1. Only when the molar ratio of BTDD to TD is 1:2, the resulting COF achieves white light emission under specific excitation. If the molar ratio of BTDD to TD is too large, COF-BTDD... X The fluorescence property of the COF is yellowish, while it is bluish if the value is too small. If the value is too large or too small, the synthesized COF will not be able to achieve the effect of white light emission.

[0007] As a further preferred embodiment, the volume ratio of mesitylene to 1,4-dioxane in the mixed solvent is 1:5. This solvent ratio can improve the reaction rate and efficiency while ensuring the formation and structural stability of COF, and reducing inhomogeneity and crystallization problems during the reaction process. An excessive proportion of 1,4-dioxane may lead to an incomplete COF structure, thus affecting the properties and applications of COF; an insufficient proportion of 1,4-dioxane will result in a slow reaction rate and excessively long reaction time, affecting the formation and yield of COF, and may also lead to insufficient precursors for dissolving COF, thus affecting COF crystallization.

[0008] As a further preferred embodiment, the specific operation of vacuum deoxygenation involves freezing-degassing-thawing. The main purpose is to remove oxygen and dissolved gases from the reaction system to improve the purity and efficiency of the reaction, while reducing adverse reactions or side reactions caused by the presence of oxygen and gases.

[0009] As a further preferred embodiment, the concentration of NaOH solution in S2 is 4 M, and the ratio of the mixed solution to NaOH solution is 10:1. If the NaOH solution concentration is too high, the COF structure will be too dense and the surface roughness will be insufficient, thus affecting its properties and applications; if it is too low, the COF formation rate will decrease, the reaction time will be prolonged, and the yield will be reduced.

[0010] As a further preferred embodiment, in S3, N,N-dimethylformamide and ethanol are used sequentially as solvents to wash the obtained precipitate.

[0011] As a further preferred embodiment, the drying temperature in S3 is 60°C. As a further preferred embodiment, the centrifugation rate is 10000 rpm.

[0012] This invention also provides the application of a three-component luminescent covalent organic framework material in the preparation of LED lamps, luminescent materials, or photocatalysis.

[0013] The beneficial effects of this invention are as follows: By controlling the monomer ratio and excitation wavelength, a three-component covalent organic framework material emitting white light was prepared. By adjusting the value of [BTDD] / ([BTDD]+[TD]), a three-component covalent organic framework material COFs (COF-BTDD) was synthesized. 33 Under 300 nm excitation, COF-BTDD 10 COF-BTDD 33 and COF-BTDD 67 All three COFs exhibited a strong emission peak at 370 nm and a weak emission at 545 nm, indicating that the three-component COFs simultaneously possessed COF-BTDD0 and COF-BTDD0 properties. 100 The fluorescence properties of COF-BTDD show that as [BTDD] / ([BTDD]+[TD]) increases, the emission at 370 nm gradually decreases, while the emission at 545 nm gradually increases. This indicates that as the value of [BTDD] / ([BTDD]+[TD]) increases, the emission at 370 nm gradually decreases, while the emission at 545 nm gradually increases. X The fluorescence properties gradually changed from being dominated by COF-BTDD0 to being dominated by COF-BTDD0 fluorescence. Simultaneously, its CIE chromaticity coordinates also changed significantly, gradually transitioning from (0.1639, 0.0497) to (0.3310, 0.5087), where COF-BTDD0 fluorescence... 33 and COF-BTDD 67The CIE chromaticity coordinates are close to the white light coordinates, being (0.2802, 0.2930) and (0.3050, 0.3684) respectively. Under different excitations, COF-BTDD0 and COF-BTDD... 10 COF-BTDD 33 COF-BTDD 67 and COF-BTDD 100 The fluorescence emission spectrum and CIE chromaticity coordinates of COF-BTDD both change, indicating excitation-dependent behavior. When the excitation is 360 nm, COF-BTDD... 33 It only exhibits yellow emission, and only COF-BTDD. 33 White light emission (0.3012, 0.3207) was achieved under 310 nm excitation. Attached Figure Description

[0014] Figure 1 The image shows a three-component covalent organic framework material (COF-BTDD0, COF-BTDD0). 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 Scanning electron microscope image of ) Figure 2 The images show (a) COF-BTDD0 and (b) COF-BTDD0. 10 (c)COF-BTDD 33 (d)COF-BTDD 67 and (e)COF-BTDD 100 Fourier transform infrared spectra of its monomers; Figure 3 The images show (a) COF-BTDD0 and (b) COF-BTDD0. 10 (c)COF-BTDD 33 (d)COF-BTDD 67 and (e)COF-BTDD 100 N2 adsorption / desorption isotherms; (f) COF-BTDD0, (g) COF-BTDD 10 (h)COF-BTDD 33 (i)COF-BTDD 67 and (j)COF-BTDD 100 Aperture distribution diagram; Figure 4 The images show (a) COF-BTDD0 and (b) COF-BTDD0. 10 (c)COF-BTDD 33 (d)COF-BTDD67 and (e)COF-BTDD 100 Fluorescence emission spectrum in aqueous solution (λ) ex =300 nm) and its (f) CIE chromaticity coordinate diagram.

[0015] Figure 5 The figures shown are the three-component covalent organic framework materials COF-BTDD0(a,f) and COF-BTDD0(a,f). 10 (b, g), COF-BTDD 33 (c, h), COF-BTDD 67 (d,i) and COF-BTDD 100 Fluorescence emission spectra and CIE chromaticity diagrams of aqueous solutions of (e,j) under excitation at 280-360 nm; Detailed Implementation The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention.

[0016] Example 1 A three-component luminescent covalent organic framework material based on white light emission, the preparation method of which includes the following steps: (1) Dissolve 0.1 mmol CPTDD, 0.05 mmol BTDD and 0.1 mmol TD in 6 mL of a mixed solvent of mesitylene / 1,4-dioxane = 1:5 and mix by sonication to obtain a mixed solution; (2) Transfer the mixed solution into a Schlenk tube, add 4 M 0.6 mL NaOH solution as a catalyst to the mixed solution and seal it; freeze-degas-thaw in liquid nitrogen, repeat the operation three times to remove oxygen, and react at 120 °C under vacuum for 72 h; after the reaction, cool to room temperature and centrifuge at 10000 rpm to obtain the precipitate; (4) The precipitate was washed by centrifugation with N,N-dimethylformamide (DMF) and ethanol in sequence to remove the adsorbed organic monomer molecules and impurities. The solid was dried in an oven at 60°C and ground to obtain an orange-yellow powder, thus obtaining the three-component covalent organic framework material COF-BTDD. 33 .

[0017] The molecular formula of CPTDD used in this embodiment is shown below: ; The molecular formula of BTDD used in this embodiment is shown below: ; The molecular formula of TD used in this embodiment is as follows: .

[0018] Example 2 The product prepared in this example is a COF synthesized by changing the reactant ratio, where CPTDD:(BTDD+TD) = 2:3 and BTDD:TD = 0:1. Named COF-BTDD0, its preparation method includes the following steps: (1) Dissolve 0.1 mmol CPTDD and 0.15 mmol TD in 6 mL of a mixed solvent of mesitylene / 1,4-dioxane = 1:5 and mix by sonication to obtain a mixed solution; (2) Transfer the mixed solution into a Schlenk tube, add 4 M 0.6 mL NaOH solution as a catalyst to the mixed solution and seal it; freeze-degas-thaw in liquid nitrogen, repeat the operation three times to remove oxygen, and react at 120 °C under vacuum for 72 h; after the reaction, cool to room temperature and centrifuge at 10000 rpm to obtain the precipitate; (4) The precipitate was centrifuged and washed with N,N-dimethylformamide (DMF) and ethanol in sequence as solvents to remove the adsorbed organic monomer molecules and impurities in the precipitate. The solid was dried in an oven at 60°C and ground to obtain a light yellow powder, thus obtaining the three-component covalent organic framework material COF-BTDD0.

[0019] Example 3 The product prepared in this example is a COF synthesized by changing the reactant ratio, where CPTDD:(BTDD+TD) = 2:3 and BTDD:TD = 1:9. The product is named COF-BTDD. 10 Its preparation method includes the following steps: (1) Dissolve 0.1 mmol CPTDD, 0.015 mmol BTDD and 0.0135 mmol TD in 6 mL of a mixed solvent of mesitylene / 1,4-dioxane = 1:5 and mix by sonication to obtain a mixed solution; (2) Transfer the mixed solution into a Schlenk tube, add 4 M 0.6 mL NaOH solution as a catalyst to the mixed solution and seal it; freeze-degas-thaw in liquid nitrogen, repeat the operation three times to remove oxygen, and react at 120 °C under vacuum for 72 h; after the reaction, cool to room temperature and centrifuge at 10000 rpm to obtain the precipitate; (4) The precipitate was washed by centrifugation with N,N-dimethylformamide (DMF) and ethanol in sequence to remove the adsorbed organic monomer molecules and impurities. The solid was dried in an oven at 60°C and ground to obtain a yellow powder, thus obtaining the three-component covalent organic framework material COF-BTDD. 10 .

[0020] Example 4 The product prepared in this example is a COF synthesized by changing the reactant ratio, where CPTDD:(BTDD+TD) = 2:3 and BTDD:TD = 2:1. This COF is named COF-BTDD. 67 Its preparation method includes the following steps: (1) Dissolve 0.1 mmol CPTDD, 0.1 mmol BTDD and 0.05 mmol TD in 6 mL of a mixed solvent of mesitylene / 1,4-dioxane = 1:5 and mix by sonication to obtain a mixed solution; (2) Transfer the mixed solution into a Schlenk tube, add 4 M 0.6 mL NaOH solution as a catalyst to the mixed solution and seal it; freeze-degas-thaw in liquid nitrogen, repeat the operation three times to remove oxygen, and react at 120 °C under vacuum for 72 h; after the reaction, cool to room temperature and centrifuge at 10000 rpm to obtain the precipitate; (4) The precipitate was washed by centrifugation with N,N-dimethylformamide (DMF) and ethanol in sequence to remove the adsorbed organic monomer molecules and impurities. The solid was dried in an oven at 60°C and ground to obtain an orange-yellow powder, thus obtaining the three-component covalent organic framework material COF-BTDD. 67 .

[0021] Example 5 The product prepared in this example is a COF synthesized by changing the reactant ratio, where CPTDD:(BTDD+TD) = 2:3 and BTDD:TD = 1:0. This COF is named COF-BTDD. 100 Its preparation method includes the following steps: (1) Dissolve 0.1 mmol CPTDD and 0.15 mmol BTDD in 6 mL of a mixed solvent of mesitylene / 1,4-dioxane = 1:5 and mix by sonication to obtain a mixed solution; (2) Transfer the mixed solution into a Schlenk tube, add 4 M 0.6 mL NaOH solution as a catalyst to the mixed solution and seal it; freeze-degas-thaw in liquid nitrogen, repeat the operation three times to remove oxygen, and react at 120 °C under vacuum for 72 h; after the reaction, cool to room temperature and centrifuge at 10000 rpm to obtain the precipitate; (4) The precipitate was washed by centrifugation with N,N-dimethylformamide (DMF) and ethanol in sequence to remove the adsorbed organic monomer molecules and impurities. The solid was dried in an oven at 60°C and ground to obtain a dark yellow powder, thus obtaining the three-component covalent organic framework material COF-BTDD. 100 .

[0022] The COF-BTDD0 and COF-BTDD0 prepared in Examples 1-5 were used. 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The corresponding morphology was observed using a scanning electron microscope, and the results are as follows: Figure 1 As shown, Figure 1 SEM images with a and e magnification of 15000x. Figure 1 It can be seen that COF-BTDD0 has an elliptical two-dimensional sheet structure; COF-BTDD 10 and COF-BTDD 100 It has a slender rod-like structure; COF-BTDD 33 and COF-BTDD 67 It has a coral-like structure.

[0023] Figure 2 The images show COF-BTDD0 and COF-BTDD prepared in Examples 1-5. 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The Fourier transform infrared (FTIR) spectra of the corresponding material COF-BTDD0 and its corresponding monomers are shown in the figure. Figure a) shows the FTIR spectra of the corresponding material COF-BTDD0 and its corresponding monomers; b) shows the FTIR spectra of the corresponding material COF-BTDD0. 10 and the Fourier transform infrared spectra of the corresponding monomers, c) corresponding material COF-BTDD 33 and the Fourier transform infrared spectra of the corresponding monomers, d) corresponding materials COF-BTDD 67 and the Fourier transform infrared spectra of the corresponding monomers, e) corresponding materials COF-BTDD 100 And the Fourier transform infrared spectra of the corresponding monomers. (From...) Figure 2 It can be seen that COF-BTDD0 and COF-BTDD10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 All exhibited similar Fourier transform infrared spectra. Due to the condensation reaction between CPTDD and BTDD and TD, the C=O stretching vibration peak (1700 cm⁻¹) originating from the BTDD and TD monomers was observed. -1 and 1680 cm -1 The peak of the C≡N stretching vibration originating from the CPTDD monomer disappeared due to the increased conjugation. -1 up to 2213 cm -1 The significant differences between the Fourier transform infrared spectra of COFs and monomers indicate the successful synthesis of COFs.

[0024] Figure 3 The images show COF-BTDD0 and COF-BTDD prepared in Examples 1-5. 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The N2 adsorption / desorption isotherms and pore size distribution diagrams are shown. Figure a) shows the N2 adsorption / desorption isotherms for material COF-BTDD0, and figure b) shows the N2 adsorption / desorption isotherms for material COF-BTDD0. 10 N2 adsorption / desorption isotherms, c) corresponding to the material COF-BTDD 33 N2 adsorption / desorption isotherms, d) corresponding to the material COF-BTDD 67 The N2 adsorption / desorption isotherm, e) corresponding to the material COF-BTDD 100 f) N2 adsorption / desorption isotherms, corresponding to the pore size distribution of material COF-BTDD0, g) corresponding to material COF-BTDD0. 10 The pore size distribution diagram, h) corresponds to the material COF-BTDD 33 Pore ​​size distribution diagram, i) corresponding to the material COF-BTDD 67 The pore size distribution diagram, j) corresponds to the material COF-BTDD 100 Aperture distribution diagrams of COF-BTDD0 and COF-BTDD0. 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The specific surface areas were 82.23, 75.91, 94.95, 90.10, and 105.48 m², respectively. 2 g −1 COF-BTDD0, COF-BTDD10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The main pore sizes are all around 3.80 nm, indicating that the three COFs have similar pore sizes.

[0025] Figure 4 The images show COF-BTDD0 and COF-BTDD prepared in Examples 1-5. 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 Fluorescence emission of the corresponding material COF-BTDD0 in aqueous solution and CIE chromaticity coordinates. Figure a) Fluorescence emission of the corresponding material COF-BTDD0 in aqueous solution; Figure b) Fluorescence emission of the corresponding material COF-BTDD0. 10 Fluorescence emission pattern in aqueous solution; c) Corresponding material COF-BTDD 33 Fluorescence emission pattern in aqueous solution; d) Corresponding material COF-BTDD 67 Fluorescence emission pattern in aqueous solution; e) Corresponding material COF-BTDD 10 Fluorescence emission diagram in aqueous solution; e) Corresponding materials COF-BTDD0, COF-BTDD 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The CIE coordinate graph. (From...) Figure 4 It can be seen that under 300 nm excitation, COF-BTDD0 and COF-BTDD 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 Both exhibit a strong emission peak at 370 nm and a weak emission at 545 nm. With the increase of [BTDD] / ([BTDD]+[TD]), the emission at 370 nm gradually weakens, while the emission at 545 nm gradually strengthens. Simultaneously, the CIE chromaticity coordinates also change significantly, gradually transitioning from (0.1639, 0.0497) to (0.3310, 0.5087). Among them, COF-BTDD... 33 and COF-BTDD 67 The CIE chromaticity coordinates are close to the white light coordinates, which are (0.2802, 0.2930) and (0.3050, 0.3684) respectively. This indicates that the emitted color can be controlled by adjusting the value of [BTDD] / ([BTDD]+[TD]).

[0026] Figure 5 The images show COF-BTDD0 and COF-BTDD prepared in Examples 1-5. 10 COF-BTDD 33 COF-BTDD 67 COF-BTDD 100 The fluorescence emission spectra and CIE chromaticity coordinates of the aqueous solution of COF-BTDD0 under excitation at 280-360 nm are shown in the figure. Figure a) shows the fluorescence emission spectrum of the aqueous solution of COF-BTDD0 under excitation at 280-360 nm, and figure b) shows the fluorescence emission spectrum of the corresponding material COF-BTDD0. 10 The fluorescence emission spectrum of the aqueous solution under excitation at 280-360 nm, c) corresponding to the material COF-BTDD 33 The fluorescence emission spectrum of the aqueous solution under excitation at 280-360 nm, d) corresponding to the material COF-BTDD 67 The fluorescence emission spectrum of the aqueous solution under excitation at 280-360 nm, e) corresponding to the material COF-BTDD 100 The fluorescence emission spectrum of the aqueous solution under excitation at 280-360 nm, f) the CIE chromaticity coordinate diagram of the corresponding material COF-BTDD0, g) the corresponding material COF-BTDD0 10 The CIE chromaticity coordinate diagram, h) corresponds to the material COF-BTDD. 33 CIE chromaticity coordinate diagram, i) corresponding to the material COF-BTDD 67 CIE chromaticity coordinate diagram, j) corresponding to the material COF-BTDD 100 The CIE chromaticity coordinate diagram. (Example) Figure 5 As shown, under different excitation conditions, COF-BTDD0 and COF-BTDD0... 10 COF-BTDD 33 COF-BTDD 67 and COF-BTDD 100 Both the fluorescence emission spectrum and CIE chromaticity coordinates of COF-BTDD changed. Only COF-BTDD showed changes. 33 White light emission (0.3012, 0.3207) was achieved under 310 nm excitation.

[0027] This invention uses 1,3,5-tris(4-cyanomethylbenzene)benzene (CPTDD) as a linker to condense with two aldehyde monomers, 2,7-dibenzaldehyde-benzothiadiazole (BTDD) and 1,4-di(4-aldehydephenyl)benzene (TD), to synthesize a two-dimensional polymer. Different COFs are synthesized by controlling the molar ratio of monomers BTDD and TD and the excitation wavelength, including a three-component COF-BTDD. 33White light emission was achieved under 310 nm excitation, enriching the methods for achieving white light emission fluorescence in luminescent covalent organic framework materials and expanding the application prospects of white light luminescent materials.

[0028] Although the description of the invention has been quite detailed and particularly of several described embodiments, it is not intended to limit it to any of these details or embodiments or any particular embodiment, but should be considered as providing a broad possible interpretation of the claims by referring to the appended claims and taking into account the prior art, thereby effectively covering the intended scope of the invention. Furthermore, the invention has been described above with respect to embodiments foreseeable by the inventors in order to provide a useful description, and non-substantial modifications to the invention that have not yet been foreseen may still represent equivalent modifications.

Claims

1. A three-component luminescent covalent organic framework material based on white light emission, characterized in that, The chemical structure of the three-component luminescent covalent organic framework material is as follows: ； Wherein TD is 1,4-bis(4-aldehydephenyl)benzene, CPTDD is 1,3,5-tris(4-cyanomethylbenzene)benzene, and BTDD is 2,7-dibenzaldehyde-benzothiadiazole; the molar ratio of [CPTDD]:[BTDD]+[TD] is 2:3; the molar ratio of [TD]:[BTDD] is 2:

1.

2. A method for preparing the three-component luminescent covalent organic framework material based on white light emission as described in claim 1, characterized in that, Includes the following steps: S1: CPTDD, BTDD and TD are dissolved together in a mixed solvent and then subjected to ultrasonic treatment to obtain a mixed solution; the mixed solvent is obtained by mixing mesitylene and 1,4-dioxane. S2: After adding NaOH solution to the mixed solution, seal it and perform vacuum deoxygenation. Then, heat the reaction under vacuum for 72 h at a temperature of 120℃. After the reaction is completed, cool it to room temperature, centrifuge it, and obtain the precipitate. S3: The precipitate was washed with solvent, centrifuged, dried, and ground to finally obtain a three-component luminescent covalent organic framework material.

3. The method according to claim 2, characterized in that, The volume ratio of mesitylene to 1,4-dioxane in the mixed solvent is 1:

5.

4. The method according to claim 2, characterized in that, The specific operation of vacuum deoxygenation is to freeze, degas, and thaw.

5. The method according to claim 2, characterized in that, The concentration of NaOH solution in S2 is 4 M, and the ratio of the mixed solution to NaOH solution is 10:

1.

6. The method according to claim 2, characterized in that, In S3, N,N-dimethylformamide and ethanol were used sequentially as solvents to wash the resulting precipitate.

7. The method according to claim 2, characterized in that, The drying temperature in S3 is 60℃.

8. The method according to claim 2, characterized in that, The centrifugation rate was 10,000 rpm.

9. The application of a three-component luminescent covalent organic framework material prepared by the method of any one of claims 2-8 in the preparation of LED lamps, luminescent materials or photocatalysis.

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