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Solid-state fluorescent carbon quantum dot with variable luminous color and preparation method thereof

A technology of carbon quantum dots and luminescent color, applied in the field of fluorescent luminescent materials, which can solve the problems of few reports and so on

Active Publication Date: 2019-12-20
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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  • Solid-state fluorescent carbon quantum dot with variable luminous color and preparation method thereof
  • Solid-state fluorescent carbon quantum dot with variable luminous color and preparation method thereof
  • Solid-state fluorescent carbon quantum dot with variable luminous color and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Add 0.4054 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.

[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 finished, cool to room temperature, take out the reaction product, and grind to obtain a crude product of carbon quantum dot powder.

[0042] Transfer the crude product of carbon quantum dot powder to a centrifuge tube, centrifuge with distilled water as the eluent, wash off the reaction by-products, collect the precipitate at the bottom of the centrifuge tube, and dry it in a vacuum oven at 80°C for 2 hours to obtain green purified carbon Quantum dot solid powder.

[0043] figure 1 It is the TEM photo of the prepared green fluorescent carbon quantum dots. It can be seen from the figure that the green fluorescent carbon quantum dots are uniformly dispersed, the parti...

Embodiment 2

[0047] Add 1.6214 g of phloroglucinol dihydrate and 1.2012 g of urea into 10 mL of distilled water, and sonicate 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 finished, cool to room temperature, take out the reaction product, and grind to obtain a crude product of carbon quantum dot powder.

[0049] Transfer the crude product of carbon quantum dot powder to a centrifuge tube, centrifuge with distilled water as the eluent, wash off the reaction by-products, collect the precipitate at the bottom of the centrifuge tube, and dry it in a vacuum oven at 80°C for 2 hours to obtain yellow purified carbon Quantum dot solid powder.

[0050] Figure 4 It is the TEM photo of the prepared yellow fluorescent carbon quantum dots. It can be seen from the figure that the yellow fluorescent carbon quantum dots are uniformly dispersed, the par...

Embodiment 3

[0054] Add 1.6214 g of phloroglucinol dihydrate and 0.3003 g of urea into 10 mL of distilled water, and sonicate 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 finished, cool to room temperature, take out the reaction product, and grind to obtain a crude product of carbon quantum dot powder.

[0056] Disperse the crude product of carbon quantum dot powder in ethanol to form a uniform dispersion, and filter it with a 0.22 μm polyvinylidene fluoride microporous membrane to obtain a purified carbon quantum dot ethanol dispersion, which is placed in a spinner bottle of a rotary evaporator , dried at 45° C. for 20 minutes to evaporate ethanol to obtain carbon quantum dot solids.

[0057] Transfer the above-mentioned carbon quantum dot solid to a centrifuge tube, and centrifuge with a mixed solution of petroleum ether and absolute ...

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Abstract

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

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 exhibiting different physical and chemical properties 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 nan...

Claims

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Application Information

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Patent Type & Authority Applications(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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