A kind of solid-state blue fluorescent carbon quantum dot with crystallization-induced luminescence enhancement and preparation method thereof

A technology of crystallization-induced luminescence and carbon quantum dots, which is applied in the preparation of carbon quantum dots, carbon quantum dot materials, and carbon quantum dots, can solve the problems of weakening and disappearing fluorescence intensity, and achieve high fluorescence quantum yield effects

Active Publication Date: 2022-05-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although most carbon quantum dots exhibit bright fluorescence in solution, when the solution dries to form a thin film or solid powder, aggregation-induced quenching occurs, and its fluorescence intensity weakens or even disappears.

Method used

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  • A kind of solid-state blue fluorescent carbon quantum dot with crystallization-induced luminescence enhancement and preparation method thereof
  • A kind of solid-state blue fluorescent carbon quantum dot with crystallization-induced luminescence enhancement and preparation method thereof
  • A kind of solid-state blue fluorescent carbon quantum dot with crystallization-induced luminescence enhancement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 1.6214 g of phloroglucinol dihydrate and 0.6006 g of urea into 10 mL of distilled water, and sonicate for 3 min to obtain a uniformly dispersed reaction solution.

[0037] The reaction solution was placed in a 100mL glass beaker and reacted in a 144W microwave oven for 15min. After the reaction was completed, it was cooled to room temperature, and the reaction solution was taken out, and placed in a -80°C refrigerator for 30 minutes to freeze, and a crystalline solid product was precipitated.

[0038] After the solid product is placed on filter paper to absorb excess water, it is placed in a vacuum oven to dry at room temperature to obtain a white crystalline blue fluorescent carbon quantum dot solid powder.

[0039] figure 1 It is the TEM photo of the prepared blue fluorescent carbon quantum dots. It can be seen from the figure that the blue fluorescent carbon quantum dots are uniformly dispersed, the particle size distribution is 1.75-4.00nm, the average particl...

Embodiment 2

[0050] Add 1.6214 g of phloroglucinol dihydrate and 9.6096 g of urea into 10 mL of distilled water, and sonicate for 3 min to obtain a uniformly dispersed reaction solution.

[0051] The reaction solution was placed in a 100mL glass beaker and reacted in a 130W microwave oven for 15min. After the reaction was completed, it was cooled to room temperature, and the reaction solution was taken out, and placed in a -80°C refrigerator for 20 minutes to freeze, and a crystalline solid product was precipitated.

[0052] After the solid product is placed on filter paper to absorb excess water, it is placed in a vacuum oven to dry at room temperature to obtain a white crystalline blue fluorescent carbon quantum dot solid powder.

[0053] Figure 8 It is a fluorescence spectrum diagram of the prepared blue fluorescent carbon quantum dots at an excitation wavelength of 365nm, and the blue fluorescent carbon quantum dots have a strong blue fluorescent emission peak at 445nm.

[0054] F...

Embodiment 3

[0056] Add 1.6214 g of phloroglucinol dihydrate and 2.4024 g of urea into 10 mL of distilled water, and sonicate for 3 min to obtain a uniformly dispersed reaction solution.

[0057] The reaction solution was placed in a 100mL glass beaker and reacted in a 140W microwave oven for 15min. After the reaction was completed, it was cooled to room temperature, and the reaction solution was taken out, and left to stand at room temperature for 15 hours, and a crystalline solid product was precipitated.

[0058] After the solid product is placed on filter paper to absorb excess water, it is placed in a vacuum oven to dry at room temperature to obtain a white crystalline blue fluorescent carbon quantum dot solid powder.

[0059] Figure 10 It is a fluorescence spectrum diagram of the prepared blue fluorescent carbon quantum dots at an excitation wavelength of 365nm, and the blue fluorescent carbon quantum dots have a strong blue fluorescent emission peak at 460nm.

[0060] Figure 11...

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Abstract

The invention relates to a crystallization-induced luminescence enhanced solid-state blue-light carbon quantum dot and a preparation method thereof, which uses phloroglucinol dihydrate as a carbon source, urea as a nitrogen source, and water as a solvent, and reacts under microwave heating with a power of 130-150W The prepared crystalline carbon quantum dots. The carbon quantum dots prepared by the invention can emit bright blue fluorescence in a crystalline state, and under the action of external stress, when the crystalline structure of the carbon quantum dots is destroyed, the fluorescence quantum yield decreases obviously.

Description

technical field [0001] The invention belongs to the technical field of fluorescent light-emitting materials, and relates to a carbon quantum dot, in particular to a carbon quantum dot material capable of emitting strong blue fluorescence in a crystalline state, and a preparation method of the carbon quantum dot. Background technique [0002] When materials enter the nanoscale range, they will have quantum size effects, surface effects and other characteristics, thus showing physical and chemical properties that are very different from ordinary materials. Carbon nanomaterials have various forms and have the advantages of excellent electrical conductivity, good biocompatibility, stable chemical properties and large specific surface area, and are widely used in the fields of nanoelectronics, optics, catalytic chemistry, biomedicine and sensors. application. [0003] Carbon quantum dots (carbon quantum dots, CQDs) generally refer to a new fluorescent carbon nanomaterial with a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y40/00
Inventor 杨永珍王军丽刘旭光郑静霞卫迎迎许并社
Owner TAIYUAN UNIV OF TECH
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