Carbon dots, preparation method therefor, carbon-dot composite material, preparation method therefor and luminescent LED (Light Emitting Diode)

A composite material and carbon nanodot technology, applied in the field of nanomaterials, can solve the problems of limiting the application of carbon nanodots, fluorescence quenching, low quantum efficiency of composite materials, etc., and achieve the effect of inhibiting aggregation-induced fluorescence quenching and high quantum efficiency.

Active Publication Date: 2017-06-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, carbon nanodots will undergo severe fluorescence quenching due to aggregation in the solid state, which severely limits the application of carbon nanodots in LED display and lighting.
[0003] In order to solve the problem of fluorescence quenching of carbon nanodots, carbon nanodots are generally dispersed in polymer matrices to prepare composite materials. Common polymer matrices such as siloxane, methyl methacrylate and starch fibers, etc., but using The

Method used

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  • Carbon dots, preparation method therefor, carbon-dot composite material, preparation method therefor and luminescent LED (Light Emitting Diode)
  • Carbon dots, preparation method therefor, carbon-dot composite material, preparation method therefor and luminescent LED (Light Emitting Diode)
  • Carbon dots, preparation method therefor, carbon-dot composite material, preparation method therefor and luminescent LED (Light Emitting Diode)

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preparation example Construction

[0036] The invention provides a method for preparing carbon nanodots, comprising:

[0037] After mixing citric acid and urea in a solvent, heating to obtain a reaction solution;

[0038] centrifuging the reaction solution to obtain carbon-nano dots;

[0039] The solvent is one or both of water, glycerol and dimethylformamide.

[0040] The invention uses citric acid and urea as raw materials to synthesize water-soluble carbon nano-dots through a solvothermal method. In the present invention, the mass ratio of citric acid and urea is preferably 1:(1-3), more preferably 1:(1.5-2.5), and most preferably 1:2. In the present invention, the mass ratio of the citric acid and urea to the solvent is preferably (2-4) g: (5-7) g: (20-40) mL, more preferably (2.5-3.5) g :(5.5~6.5)g:(25~35)mL, most preferably 3g:6g:30mL.

[0041] In the present invention, the heating can be carried out in a reactor, preferably in a steel-lined polytetrafluoroethylene reactor, and the heating is preferab...

Embodiment 1

[0063] Mix and dissolve 3g of citric acid and 6g of urea in 30mL of deionized water to obtain a colorless and transparent solution;

[0064] The obtained colorless and transparent solution was added to a 50mL steel-lined polytetrafluoroethylene reactor, and sealed and heated at 160°C for 4 hours to obtain a reaction mixture;

[0065] The obtained reaction mixture was dissolved in 60 mL of ethanol, and centrifuged at a speed of 8000 rpm; the upper liquid was removed, the precipitate was dissolved in 60 mL of ethanol and centrifuged for about 3 times, and the precipitate was freeze-dried to obtain blue light carbon nanodots.

[0066] The obtained blue-light carbon nano-dots were detected by Hitachi F-7000 fluorescence spectrophotometer equipment, the optimal emission wavelength of the blue-light carbon nano-dots was 450nm, and the fluorescence quantum efficiency was 0.32.

[0067] Mix the blue-light carbon nano-dot aqueous solution with sodium water glass (liquid sodium silicate...

Embodiment 2

[0071] Carbon nanodots were prepared according to the method of Example 1. The difference from Example 1 was that the 30mL deionized in Example 1 was replaced with 30mL of water and glycerol with a volume ratio of 1:1 to obtain blue blue light carbon nanodots .

[0072] According to the method of Example 1, the blue cyan-light carbon nano-dots were prepared into carbon nano-dot composite phosphors.

[0073] According to the method of Example 1, the optimal emission wavelength of the blue-cyan light carbon nano-dots is 470nm, and the fluorescence quantum efficiency is 0.22. The emission wavelength of the carbon-nano-dot composite phosphor prepared in Example 2 is 460nm under ultraviolet excitation. The fluorescence quantum efficiency is 0.35.

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Abstract

The invention provides a preparation method for carbon dots. The preparation method comprises the steps: mixing citric acid and urea in a solvent, and then, carrying out heating, so as to obtain a reaction solution; and carrying out centrifugal separation on the reaction solution, so as to obtain precipitates, i.e., the carbon dots, wherein the solvent is one or a mixture of two of water, glycerine and dimethylformamide. According to method, visible-light-all-waveband-luminescent carbon dots are prepared through adopting different solvents, and thus, the carbon-dot composite material provided by the invention can emit light in all wave band of visible light, particularly, white-light carbon-dot composite materials of different color coordinates and color temperatures can be obtained by adopting the carbon dots of different colors. Furthermore, the carbon-dot composite material provided by the invention employs silicon dioxide as a dispersion matrix, so that gathered induced fluorescence quenching can be inhibited, and the composite material has relatively high quantum efficiency. The invention further provides the preparation method for the carbon dots, the carbon-dot composite material, a preparation method therefor and a luminescent LED (Light Emitting Diode).

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a carbon nano-dot and a preparation method thereof, a carbon nano-dot composite material and a preparation method thereof, and a light-emitting LED. Background technique [0002] Carbon nanodots (Carbon dots, CDots) are a new type of luminescent carbon nanomaterials, which have small particle size, high fluorescence stability, no light flicker, wide and continuous excitation spectrum, tunable emission wavelength, and biocompatibility. It is considered as a potential substitute for organic dyes and semiconductor quantum dots due to its good properties and low toxicity. However, carbon nanodots will undergo serious fluorescence quenching due to aggregation in the solid state, which severely limits the application of carbon nanodots in LED display and lighting. [0003] In order to solve the problem of fluorescence quenching of carbon nanodots, carbon nanodots are generally d...

Claims

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Application Information

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IPC IPC(8): C09K11/65H01L33/50B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65H01L33/502H01L33/504
Inventor 曲松楠田震张旭涛
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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