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Preparation method of zero-dimensional and two-dimensional hybridized all-carbon white fluorescent powder

A phosphor, zero-dimensional technology, applied in chemical instruments and methods, luminescent materials, nanotechnology for materials and surface science, etc., can solve the problem of reducing the luminous intensity of carbon quantum dots, increasing the preparation steps and costs, and limiting carbon materials Optical development and other issues, to achieve the effect of preventing violent bumping, simple method and good dispersion

Active Publication Date: 2017-12-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic light-emitting phosphors based on carbon quantum dots also have some technical challenges. The luminescence of pure carbon quantum dots in the solid state is weakened and unstable, and carbon quantum dots have poor film-forming properties.
At present, many carbon quantum dots need to add resin, adhesive, starch and other polymers to form solid-state phosphors when preparing phosphors, which greatly reduces the luminous intensity of carbon quantum dots and increases the preparation steps and costs. Limits the development of carbon materials in optics

Method used

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  • Preparation method of zero-dimensional and two-dimensional hybridized all-carbon white fluorescent powder
  • Preparation method of zero-dimensional and two-dimensional hybridized all-carbon white fluorescent powder
  • Preparation method of zero-dimensional and two-dimensional hybridized all-carbon white fluorescent powder

Examples

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Effect test

Embodiment 1

[0034] A method for preparing a zero-dimensional and two-dimensional hybrid all-carbon white light phosphor, the specific steps are as follows:

[0035] 1) At 180°C, under the protection of nitrogen, stir and heat 1.5 g hexadecylamine and 15 ml octadecene in an oil bath. After the temperature is stable, slowly and evenly add 1.0 g of anhydrous citric acid, and stir for 3 hours. When the reaction is over, stop nitrogen Pass into, cool to room temperature, obtain the crude product of yellow fluorescent powder;

[0036] 2) Use a high-speed centrifuge device, at a speed of 8000r / min, centrifuge for 15 minutes to clean, and repeat the cleaning steps with acetone and absolute ethanol until the solution is milky white;

[0037] 3) Use a vacuum rotary evaporator with a rotary evaporation temperature of 65°C to evaporate acetone and absolute ethanol to obtain a white powder;

[0038] 4) Dissolving the white powder in chloroform, standing for 3 hours, distilling off the solvent chlorof...

Embodiment 2

[0052] A method for preparing a zero-dimensional and two-dimensional hybrid all-carbon white light phosphor, the specific steps are as follows:

[0053] 1) At 185°C, under the protection of nitrogen, stir and heat 1.4g tetradecylamine and 20ml octadecene oil bath. After the temperature is stable, add 1.2g anhydrous citric acid slowly and evenly, and stir for 3.5h. When the reaction is over, stop Nitrogen gas was introduced and cooled to room temperature to obtain the crude product of yellow fluorescent powder;

[0054] 2) Use a high-speed centrifuge device, at a speed of 9000r / min, centrifuge for 10 minutes to clean, and repeat the cleaning steps with acetone and absolute ethanol until the solution is milky white;

[0055] 3) Use a vacuum rotary evaporator with a rotary evaporation temperature of 60°C to evaporate acetone and absolute ethanol to obtain a white powder;

[0056] 4) Dissolving the white powder in chloroform, standing still for 5 hours, distilling off the solvent...

Embodiment 3

[0059] A method for preparing a zero-dimensional and two-dimensional hybrid all-carbon white light phosphor, the specific steps are as follows:

[0060] 1) At 175°C, under the protection of nitrogen, stir and heat 2.0 g of octadecylamine and 25 ml of octadecene in an oil bath. After the temperature is stable, slowly and evenly add 1.5 g of anhydrous citric acid, and stir for 5 hours. When the reaction is over, stop the nitrogen Pass into, cool to room temperature, obtain the crude product of yellow fluorescent powder;

[0061] 2) Use a high-speed centrifuge device, at a speed of 10000r / min, centrifuge for 20 minutes to clean, and repeat the cleaning steps with acetone and absolute ethanol until the solution is milky white;

[0062] 3) Use a vacuum rotary evaporator with a rotary evaporation temperature of 70°C to evaporate acetone and absolute ethanol to obtain a white powder;

[0063] 4) Dissolving the white powder in chloroform, standing still for 8 hours, distilling off th...

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Abstract

The invention discloses a preparation method of zero-dimensional and two-dimensional hybridized all-carbon white fluorescent powder. The method comprises the steps of adopting anhydrous citric acid as a carbon source and alkylamine as a passivator, carrying out hydrothermal reaction to prepare the zero-dimensional and two-dimensional hybridized all-carbon white fluorescent powder. The fluorescent powder comprises zero-dimensional carbon quantum dots and two-dimensional carbon nanosheets; the defects of aggregation of the carbon quantum dots and optical quenching after film formation are effectively inhibited through the two-dimensional nanosheets; the film and the powder emit white light with high luminous intensity and pure chromaticity.

Description

technical field [0001] The invention relates to the technical field of phosphor powders for white light LEDs, in particular to a method for preparing zero-dimensional and two-dimensional hybrid all-carbon white light-emitting phosphors. Background technique [0002] Carbon-based electronic materials mainly include carbon quantum dots, carbon nanotubes, graphene, nanofibers, etc., which have unique topological structures and excellent optoelectronic properties. Broad application prospects. Among carbon electronic materials, compared with traditional semiconductor quantum dots, carbon quantum dots have attracted the attention and research of academia and industry due to their outstanding advantages such as adjustable luminescence, low toxicity, wide range of raw materials, and good biocompatibility. [0003] Although carbon quantum dots have many advantages and prospects, carbon quantum dots still face many obstacles at present. For example, bare carbon quantum dots are vulne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00Y02B20/00
Inventor 刘举庆丁亚梅王展陈营营黄维
Owner NANJING UNIV OF TECH
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