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Green fluorescent carbon quantum dot with high yield and high fluorescent quantum yield, and preparation method thereof

A carbon quantum dot and green fluorescence technology, applied in the field of green fluorescent carbon quantum dots and carbon quantum dots, can solve the problems of low yield fluorescence quantum yield, low yield of green fluorescent carbon quantum dots, etc., and reduce the color temperature. , The effect of solving the problem of luminous brightness and efficiency

Inactive Publication Date: 2019-12-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, little attention has been paid to the yield of green fluorescent carbon quantum dots, and the yield and fluorescence quantum yield are generally low

Method used

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  • Green fluorescent carbon quantum dot with high yield and high fluorescent quantum yield, and preparation method thereof
  • Green fluorescent carbon quantum dot with high yield and high fluorescent quantum yield, and preparation method thereof
  • Green fluorescent carbon quantum dot with high yield and high fluorescent quantum yield, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 4mL of ethylenediamine to 0.4g of 2,7-dihydroxynaphthalene, and then add 2mL of 30wt% hydrogen peroxide. At this time, a violent reaction occurs, and a large amount of heat is released while bubbling. After the reaction, 40 mL of absolute ethanol was added and stirred to obtain a uniform deep wine red solution.

[0031] The solution was transferred to a 100mL polytetrafluoroethylene stainless steel autoclave, heated to 180°C for solvothermal reaction for 12h. After the reaction was completed, it was naturally cooled to room temperature to obtain a green fluorescent carbon quantum dot reaction solution.

[0032] Transfer the above-mentioned green fluorescent carbon quantum dot reaction solution to a spinner bottle, place it on a rotary evaporator, concentrate it by rotary evaporator to a small amount of liquid residue, add a small amount of ethyl acetate, centrifuge at 8000rpm for 5min, repeat 3 times, and put it in an oven Dry to obtain purified green fluorescent c...

Embodiment 2

[0043] Add 2mL of ethylenediamine to 0.4g of 2,7-dihydroxynaphthalene, and then add 2mL of 30wt% hydrogen peroxide. At this time, a violent reaction occurs, and a large amount of heat is released while bubbling. After the reaction, 40 mL of absolute ethanol was added and stirred to obtain a uniform deep wine red solution.

[0044] The solution was transferred to a 100mL polytetrafluoroethylene stainless steel autoclave, heated to 180°C for solvothermal reaction for 12h. After the reaction was completed, it was naturally cooled to room temperature to obtain a green fluorescent carbon quantum dot reaction solution.

[0045] Transfer the above-mentioned green fluorescent carbon quantum dot reaction solution to a spinner bottle, place it on a rotary evaporator, concentrate it by rotary evaporator to a small amount of liquid residue, add a small amount of ethyl acetate, centrifuge at 8000rpm for 5min, repeat 3 times, and put it in an oven Dry to obtain purified green fluorescent c...

Embodiment 3

[0048] Add 4mL of ethylenediamine to 0.4g of 2,7-dihydroxynaphthalene, and then add 2mL of 30wt% hydrogen peroxide. At this time, a violent reaction occurs, and a large amount of heat is released while bubbling. After the reaction, 40 mL of absolute ethanol was added and stirred to obtain a uniform deep wine red solution.

[0049] The solution was transferred to a 100mL polytetrafluoroethylene stainless steel autoclave, heated to 200°C for solvothermal reaction for 12h. After the reaction was completed, it was naturally cooled to room temperature to obtain a green fluorescent carbon quantum dot reaction solution.

[0050] Transfer the above-mentioned green fluorescent carbon quantum dot reaction solution to a spinner bottle, place it on a rotary evaporator, concentrate it by rotary evaporator to a small amount of liquid residue, add a small amount of ethyl acetate, centrifuge at 8000rpm for 5min, repeat 3 times, and put it in an oven Dry to obtain purified green fluorescent c...

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Abstract

The invention relates to a green fluorescent carbon quantum dot and a preparation method thereof. The green fluorescent carbon quantum dot is prepared through a solvothermal technology by taking 2,7-dihydroxynaphthalene as a carbon source, hydrogen peroxide as an oxidizing agent, ethylenediamine as a nitrogen doping agent and anhydrous ethanol as a solvent. The green fluorescent carbon quantum dotprepared by the method has a high yield and a high fluorescent quantum yield, and can be used for preparing warm white LEDs suitable for indoor illumination as a phosphor.

Description

technical field [0001] The invention belongs to the technical field of fluorescent luminescent materials, and relates to carbon quantum dots, in particular to a green fluorescent carbon quantum dot and a preparation method of the carbon quantum dot. The green fluorescent carbon quantum dot prepared by the invention has high yield and high fluorescent quantum yield, and can be used as a fluorescent powder in warm white LEDs. Background technique [0002] As a fluorescent carbon nanomaterial with a size below 10nm, carbon quantum dots have good water solubility, excellent chemical inertness, unique anti-photobleaching properties, low toxicity and good biocompatibility. Among these excellent properties, carbon quantum dots are widely used in white light LEDs due to their unique optical properties (relatively long fluorescence lifetime, good fluorescence stability). A large number of experimental results have shown that carbon quantum dots have great application potential in ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y40/00C01B32/15C01P2002/72C01P2002/82C01P2002/84C01P2004/64C09K11/65H01L33/502Y02B20/00
Inventor 郑静霞杨永珍谢艳亭刘旭光许并社
Owner TAIYUAN UNIV OF TECH
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