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Narrow-spectrum emission red-light carbon quantum dots and hydrothermal preparation method and application thereof

A technology of carbon quantum dots and narrow spectrum, which is applied in the field of preparation of red light-emitting carbon quantum dots by hydrothermal method, to achieve high color purity, independent excitation efficiency, and high-fidelity graphic display

Active Publication Date: 2020-10-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to aim at the emission of blue light and green light for most of the current carbon quantum dots

Method used

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  • Narrow-spectrum emission red-light carbon quantum dots and hydrothermal preparation method and application thereof
  • Narrow-spectrum emission red-light carbon quantum dots and hydrothermal preparation method and application thereof
  • Narrow-spectrum emission red-light carbon quantum dots and hydrothermal preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0057] Method for preparing red light-emitting carbon quantum dots by hydrothermal method:

[0058] (1) Take 0.2 g of anthracene carbinol in a 50 mL beaker, measure 10 mL of ethanol into the beaker, and add 2 mL of N,N-formamide into the beaker;

[0059] (2) Put the mixture obtained in (1) into an ultrasonic cleaner for 10 minutes to disperse evenly;

[0060] (3) Transfer the mixed solution obtained in (2) into an autoclave, place the autoclave in a dry box, and react at 200 °C for 9 h, the solution turns from orange yellow to orange red;

[0061] (4) After naturally cooling to room temperature, centrifuge at 12,500 rpm for 5 min and remove the supernatant, disperse the obtained carbon quantum dot precipitate with 1,4-dioxane, and then use a 0.22 μm organic phase membrane Filtrate, take the supernatant, add cyclohexane dropwise to the supernatant for poor solvent sedimentation, dissolve the precipitate in the solvent after centrifugation and then use poor solvent for sediment...

Embodiment 2

[0067] (1) Take 0.2 g of anthracene carbinol in a 50 mL beaker, measure 10 mL of ethanol into the beaker, and add 2 mL of N,N-formamide into the beaker;

[0068] (2) Put the mixture obtained in (1) into an ultrasonic cleaner for 10 minutes to disperse evenly;

[0069] (3) Transfer the mixed solution obtained in (2) into an autoclave, place the autoclave in a dry box, and react at 80 °C for 9 h, and the solution is orange-yellow;

[0070] (4) After naturally cooling to room temperature, centrifuge at 12,500 rpm for 5 min and remove the supernatant, disperse the obtained carbon quantum dot precipitate with 1,4-dioxane, and then use a 0.22 μm organic phase membrane After filtering, take the supernatant, settle with a poor solvent, and then disperse in 1,4-dioxane. It is found that the sample of Example 2 emits orange light.

Embodiment 3

[0072] (1) Take 0.2 g of anthracene carbinol in a 50 mL beaker, measure 10 mL of ethanol into the beaker, and add 2 mL of N,N-formamide into the beaker;

[0073] (2) Put the mixture obtained in (1) into an ultrasonic cleaner for 10 minutes to disperse evenly;

[0074] (3) Transfer the mixed solution obtained in (2) into an autoclave, place the autoclave in a dry box, and react at 240 °C for 9 h, and the solution is orange-yellow;

[0075] (4) After naturally cooling to room temperature, centrifuge at 12,500 rpm for 5 min and remove the supernatant, disperse the obtained carbon quantum dot precipitate with 1,4-dioxane, and then use a 0.22 μm organic phase membrane Filtrate, take the supernatant, add cyclohexane dropwise to the supernatant for poor solvent sedimentation, dissolve the precipitate in the solvent after centrifugation and then use poor solvent for sedimentation, and then disperse in 1,4-dioxane, Finally, a carbon quantum dot solution with a fluorescence emission of...

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Abstract

The invention discloses narrow-spectrum emission red-light carbon quantum dots and a hydrothermal preparation method and application thereof. The preparation method comprises the following steps of: dissolving or dispersing anthrarufin and a selected catalyst into a pure solvent or a mixed solvent at the same time, stirring to obtain a uniform precursor solution, reacting the reaction solution forseveral hours under a solvothermal condition of a reaction kettle, cooling to room temperature to obtain a crude product dispersion liquid, and finally purifying, drying and dispersing the crude product dispersion liquid to obtain the narrow-spectrum emission red light carbon quantum dot material. The carbon quantum dots designed by the invention have the characteristics of red light emission (emission peak: -615nm), narrow full width at half maximum (FWHM<30nm) and high fluorescence quantum efficiency (PLQY>40%). The red-light carbon quantum dots, a blue-light chip and a green-light chip arepackaged together to form a white-light LED backlight source, and the color gamut of an LCD can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a method for preparing red light-emitting carbon quantum dots by a hydrothermal method. Background technique [0002] Carbon quantum dots (Carbon Quantum dots, CQDs) is a carbon-based zero-dimensional material with a size of less than 10nm monodisperse spherical nano-carbon materials. Carbon quantum dots have many advantages such as excellent optical properties, good water solubility, low toxicity, environmental friendliness, wide source of raw materials, low cost, and good biocompatibility. It is considered to be the best substitute for traditional cadmium-based toxic quantum dots, and is widely used in drug loading, bioimaging, metal particle detection, photoelectrocatalysis and LED applications. [0003] At present, there are many methods for preparing carbon quantum dots at home and abroad. From the perspective of carbon source precursors, it can be divided int...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65
CPCC01B32/15C09K11/65Y02B20/00
Inventor 章勇李雨曦蓝栩砚詹凯王佳宁邹树华
Owner SOUTH CHINA NORMAL UNIVERSITY
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