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A kind of solid-state fluorescent carbon quantum dots with variable luminescence color and preparation method thereof

A technology of carbon quantum dots and luminescent color, applied in the field of fluorescent luminescent materials, can solve the problem of few reports, and achieve the effect of increasing the color rendering index

Active Publication Date: 2022-07-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, most of the currently prepared solid-state fluorescent carbon quantum dots emit blue-green light, and there are few reports on long-wavelength solid-state luminescent carbon quantum dots such as yellow, orange, and red light.

Method used

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  • A kind of solid-state fluorescent carbon quantum dots with variable luminescence color and preparation method thereof
  • A kind of solid-state fluorescent carbon quantum dots with variable luminescence color and preparation method thereof
  • A kind of solid-state fluorescent carbon quantum dots with variable luminescence color and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 0.4054 g of phloroglucinol dihydrate and 2.4024 g of urea were added to 10 mL of distilled water, and ultrasonicated for 3 min to obtain a uniformly dispersed reaction solution.

[0041] The reaction solution was placed in a 100 mL glass beaker and reacted in a 288W microwave oven for 15 min. After the reaction is completed, it is cooled to room temperature, and the reaction product is taken out and ground to obtain a crude product of carbon quantum dot powder.

[0042] The crude product of carbon quantum dot powder was transferred to a centrifuge tube, centrifuged with distilled water as the eluent, the reaction by-products were eluted, the precipitate at the bottom of the centrifuge tube was collected, and dried in a vacuum oven at 80 °C for 2 hours to obtain green purified carbon Quantum dot solid powder.

[0043] figure 1 TEM image of the prepared green fluorescent carbon quantum dots. It can be seen from the figure that the green fluorescent carbon quantum dots ...

Embodiment 2

[0047] 1.6214 g of phloroglucinol dihydrate and 1.2012 g of urea were added to 10 mL of distilled water, and ultrasonicated for 3 min to obtain a uniformly dispersed reaction solution.

[0048] The reaction solution was placed in a 100 mL glass beaker and reacted in a 288W microwave oven for 15 min. After the reaction is completed, it is cooled to room temperature, and the reaction product is taken out and ground to obtain a crude product of carbon quantum dot powder.

[0049] The crude product of carbon quantum dot powder was transferred to a centrifuge tube, centrifuged with distilled water as the eluent, the reaction by-products were eluted, the precipitate at the bottom of the centrifuge tube was collected, and dried in a vacuum oven at 80°C for 2 hours to obtain yellow purified carbon Quantum dot solid powder.

[0050] Figure 4 TEM image of the prepared yellow fluorescent carbon quantum dots. It can be seen from the figure that the yellow fluorescent carbon quantum dots...

Embodiment 3

[0054] 1.6214 g of phloroglucinol dihydrate and 0.3003 g of urea were added to 10 mL of distilled water, and ultrasonicated for 3 min to obtain a uniformly dispersed reaction solution.

[0055] The reaction solution was placed in a 100 mL glass beaker and reacted in a 288W microwave oven for 15 min. After the reaction is completed, it is cooled to room temperature, and the reaction product is taken out and ground to obtain a crude product of carbon quantum dot powder.

[0056] Disperse the crude product of the carbon quantum dots in ethanol to form a uniform dispersion, filter with a 0.22 μm polyvinylidene fluoride microporous membrane to obtain a purified carbon quantum dots ethanol dispersion, which is placed in a spinner of a rotary evaporator , dried at 45 °C for 20 min and evaporated ethanol to obtain solid carbon quantum dots.

[0057] The above-mentioned carbon quantum dot solids were transferred to a centrifuge tube, and centrifuged with a petroleum ether anhydrous et...

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Abstract

The invention relates to a solid-state fluorescent carbon quantum dot with variable luminescence color and a preparation method thereof. The carbon quantum dots are prepared by reacting phloroglucinol dihydrate as a carbon source, urea as a nitrogen source, and water as a solvent under microwave heating with a power of 250-500W. The carbon quantum dots prepared by the invention can emit bright fluorescence with adjustable color in solid state, the emission peak spans from 508nm to 635nm, covering the entire visible spectrum, especially can emit long-wavelength fluorescence, and is suitable for preparing white light emitting diodes as phosphors .

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 fluorescence in a solid state, and a preparation method of the carbon quantum dot. Background technique [0002] When the material enters the nanoscale range, it will have characteristics such as quantum size effect, small size effect, surface effect and quantum tunneling effect, 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. They have been widely used in the fields of nanoelectronics, optics, catalytic chemistry, biomedicine and sensors. application. [0003] Carbon quantum dots (CQDs) generally refer to a new type of fluorescent carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00
CPCC01B32/15C09K11/65B82Y20/00B82Y40/00Y02B20/00
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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