Self-protection carbonized polymer dot with panchromatic time-dependent adjustable phosphorescence and preparation method of self-protection carbonized polymer dot

Abstract

The invention belongs to the field of carbon nano luminescent materials, and relates to a self-protection carbonized polymer dot with panchromatic time-dependent adjustable phosphorescence and a preparation method thereof. Three organic molecules of urea, 1, 8-naphthalimide and quinacridone are selected as carbon sources and are heated in a mixed solution of ethanol and water to prepare the carbonized polymer dots. By increasing the surface C = O content and aggregation degree of the carbonized polymer dots, a series of self-protection carbonized polymer dots with panchromatic time-dependent adjustable phosphorescence from green to blue, from yellow to green, from orange to green, from orange to yellow and from red to orange are obtained. The carbonized polymer point prepared by the self-protection method realizes time-dependent adjustable phosphorescence in the whole visible light range, and has huge application value in the fields of anti-counterfeiting, dynamic information encryption and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of carbon nanometer luminescent material, in particular to a self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence and a preparation method thereof. BACKGROUND

[0002] The time-dependent adjustable phosphorescence can provide an additional color channel in the time dimension, so that the information can be more complexly coded, and has great application potential in the field of dynamic information encryption. However, the time-dependent adjustable phosphorescence materials reported so far are limited to organic molecular crystals, organic amorphous polymers and metal organic halides, and their afterglow is concentrated in the yellow-green band. Therefore, it is an urgent problem to be solved to seek new materials and preparation methods to improve the application value of time-dependent adjustable phosphorescence materials.

[0003] The carbonized polymer dot is a new type of metal-free nanoparticle, which becomes the best candidate to solve the above problems due to its simple preparation method, low cost and excellent optical performance. However, the intervention of solid matrix affects the adjustable range of afterglow of the carbonized polymer dot, thereby limiting its modification for nanotechnology-related applications.

[0004] Therefore, it is very important to develop a self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide a preparation method of a self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence, and to realize its application in the fields of anti-counterfeiting and dynamic information encryption.

[0006] A self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence and a preparation method thereof, comprising the following steps: Preparation of a self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence: urea, 1,8-naphthalene dicarboximide and quinacridone are dissolved in 40 mL of ethanol solution at a certain ratio, then mixed with 10 mL of water, and the obtained solution is placed in a forced air drying oven for reaction, the reaction temperature is set at 200℃, and the reaction time is controlled at 5-8h; after the reactor is naturally cooled to room temperature, the obtained solid powder is added into 20 mL of dimethyl sulfoxide to form a carbonized polymer dot solution, then filtered with a filter membrane (0.22μm) to remove large particles; finally, 200 mL of water is added to the generated solution, and the precipitated powder is collected and dried to obtain a self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence; Further, by adjusting the precursor ratio and reaction time, a self-protected carbonized polymer dot with full-color time-dependent adjustable phosphorescence from green to blue, from yellow to green, from orange to green, from orange to yellow and from red to orange is obtained respectively. Further, the key parameters corresponding to the synthesis of the self-protected carbonized polymer dots from green to blue are: in the synthesis step of the carbon dots, urea is 12.50 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 5 h; the key parameters corresponding to the synthesis of the self-protected carbonized polymer dots from yellow to green are: in the synthesis step of the carbon dots, urea is 70.30 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 6 h; the key parameters corresponding to the synthesis of the self-protected carbonized polymer dots from orange to green are: in the synthesis step of the carbon dots, urea is 124.50 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 6 h; the key parameters corresponding to the synthesis of the self-protected carbonized polymer dots from orange to yellow are: in the synthesis step of the carbon dots, urea is 190.10 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 8 h; and the key parameters corresponding to the synthesis of the self-protected carbonized polymer dots from red to orange are: in the synthesis step of the carbon dots, urea is 250.20 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 8 h.

[0007] The self-protected carbonized polymer dots have wide application prospects in the fields of advanced information protection and environmentally friendly time-delay lighting. The self-protected carbonized polymer dots have wide application prospects in the fields of advanced information protection and environmentally friendly time-delay lighting.

[0008] The self-protected carbonized polymer dots have wide application prospects in the fields of advanced information protection and environmentally friendly time-delay lighting. The self-protected carbonized polymer dots have wide application prospects in the fields of advanced information protection and environmentally friendly time-delay lighting. The self-protected carbonized polymer dots have wide application prospects in the fields of advanced information protection and environmentally friendly time-delay lighting. The self-protected carbonized polymer dots have wide application prospects in the fields of advanced information protection and environmentally friendly time-delay lighting. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a schematic diagram of the preparation process of the self-protected carbonized polymer dots; Figure 2 is a digital photograph of five kinds of carbon dots prepared in the examples, namely, the self-protected carbonized polymer dots from green to blue, from yellow to green, from orange to green, from orange to yellow, and from red to orange, before and after the environment conditions are closed under the ultraviolet lamp (365 nm); Figure 3 are phosphorescence emission spectra (delayed by 0.1 s) of three kinds of carbon dot powders under excitation of light at different wavelengths: (a) is the self-protected carbonized polymer dots from green to blue prepared in Example 1, (b) is the self-protected carbonized polymer dots from yellow to green prepared in Example 2, and (c) is the self-protected carbonized polymer dots from red to orange prepared in Example 3; Figure 4 are time-resolved phosphorescence spectra of three kinds of carbon dot powders under irradiation of a 365 nm ultraviolet lamp: (a) is the self-protected carbonized polymer dots from green to blue prepared in Example 1, (b) is the self-protected carbonized polymer dots from yellow to green prepared in Example 2, and (c) is the self-protected carbonized polymer dots from red to orange prepared in Example 3.

Claims

1. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence and a preparation method thereof, characterized in that, The method comprises the following steps: urea, 1,8-naphthalene dicarboximide and quinacridone are dissolved in 40 mL of ethanol solution in a certain proportion, then mixed with 10 mL of water, and the obtained solution is placed in a blast drying oven for reaction, the reaction temperature is set at 200°C, and the reaction time is controlled at 5-8 h; After the reactor is naturally cooled to room temperature, the obtained solid powder is added into 20 mL of dimethyl sulfoxide to form a carbonized polymer dot solution, then filtered with a filter membrane (0.22 μm) to remove large particles; Finally, 200 mL of water is added to the generated solution, and the precipitated powder is collected and dried to obtain full-color-dependent adjustable phosphorescent self-protecting carbonized polymer dots.

2. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 1, characterized in that, By adjusting the precursor ratio and reaction time, full-color time-dependent adjustable phosphorescent self-protecting carbonized polymer dots from green to blue, from yellow to green, from orange to green, from orange to yellow and from red to orange are obtained.

3. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 2, characterized in that, The corresponding key parameters for synthesizing the self-protecting carbonized polymer dots from green to blue are as follows: in the synthesis step of the carbon dots, urea is 12.50 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 5 h.

4. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 2, wherein, The corresponding key parameters for synthesizing the self-protecting carbonized polymer dots from yellow to green are as follows: in the synthesis step of the carbon dots, urea is 70.30 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 6 h.

5. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 2, wherein, The corresponding key parameters for synthesizing the self-protecting carbonized polymer dots from orange to green are as follows: in the synthesis step of the carbon dots, urea is 124.50 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 6 h.

6. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 2, wherein, The corresponding key parameters for synthesizing the self-protecting carbonized polymer dots from orange to yellow are as follows: in the synthesis step of the carbon dots, urea is 190.10 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 8 h.

7. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 2, wherein, The corresponding key parameters for synthesizing the self-protecting carbonized polymer dots from red to orange are as follows: in the synthesis step of the carbon dots, urea is 250.20 mg, 1,8-naphthalene dicarboximide is 3.79 mg, quinacridone is 0.12 mg, and the reaction time is 8 h.

8. A self-protected carbonized polymer dot with full-color time-dependent tunable phosphorescence according to claim 1, wherein, The obtained self-protecting carbonized polymer dots can be applied to multi-level anti-counterfeiting, dynamic information encryption and time-delay LED.

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