Preparation method of multicolor fluorescent carbon dots and application of multicolor fluorescent carbon dots in aspect of LED (light-emitting diode)

A technology of fluorescent carbon dots and carbon dots, which is applied in chemical instruments and methods, nano-optics, luminescent materials, etc., can solve the problems of difficult uniform dispersion, large particle size, and difficult to control, and achieve the effect of luminescence and encapsulation.

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

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Problems solved by technology

However, inorganic phosphors have many disadvantages, such as consumption of rare earth resources, high reaction temperature, large particle size and difficulty in controlling, and difficulty in uniform dispersion. Therefore, carbon dots are of great significance as alternative materials.

Method used

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  • Preparation method of multicolor fluorescent carbon dots and application of multicolor fluorescent carbon dots in aspect of LED (light-emitting diode)
  • Preparation method of multicolor fluorescent carbon dots and application of multicolor fluorescent carbon dots in aspect of LED (light-emitting diode)
  • Preparation method of multicolor fluorescent carbon dots and application of multicolor fluorescent carbon dots in aspect of LED (light-emitting diode)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of blue light carbon dots is as follows:

[0042] 1. Weigh 0.192g of citric acid and 0.6g of urea, put them in a 20mL reaction kettle, add 10mL of N,N-dimethylformamide (DMF) into it, put them in an oven, raise the temperature to 140°C, and keep it warm for 12 hours , cooled naturally to obtain a blue light carbon dot solution.

[0043] 2. Put the solution obtained in step 1 into a centrifuge tube, set the rotation speed to 10000rpm, centrifuge for 10min, and take the supernatant.

[0044] 3. Add petroleum ether and ethyl acetate to the supernatant, and a precipitate appears in the solution.

[0045] 4. Centrifuge the solution in step 3 to obtain a precipitate, put it in an oven at 70°C for drying, and obtain a blue fluorescent carbon dot solid.

[0046] figure 1 This is the transmission electron microscope image and size distribution diagram of the blue-light carbon dots, from which it can be seen that the blue-light carbon dots are evenly dis...

Embodiment 2

[0049] The preparation method of green carbon dots is as follows:

[0050] 1. Weigh 0.576g of citric acid and 0.6g of urea, put them in a 20mL reaction kettle, add 10mL of N,N-dimethylformamide (DMF) into it, put them in an oven, raise the temperature to 160°C, and keep it warm for 12 hours , cooled naturally to obtain a green light carbon dot solution.

[0051] 2. Put the solution obtained in step 1 into a centrifuge tube, set the rotation speed to 10000rpm, centrifuge for 10min, and take the supernatant.

[0052] 3. Add petroleum ether and ethyl acetate to the supernatant, and a precipitate appears in the solution.

[0053] 4. Centrifuge the solution in step 3 to obtain a precipitate, put it in an oven at 70° C. to dry, and obtain a green fluorescent carbon dot solid.

[0054] image 3 This is the transmission electron micrograph and size distribution diagram of the green carbon dots obtained, from which it can be seen that the green carbon dots are evenly dispersed. It ...

Embodiment 3

[0057] The preparation method of red light carbon dots is as follows:

[0058] 1. Weigh 1.44g citric acid and 0.6g urea, put them in a 20mL reaction kettle, add 10mL N,N-dimethylformamide (DMF) into it, put them in an oven, raise the temperature to 200°C, and keep it warm for 12 hours , cooled naturally to obtain a red light carbon dot solution.

[0059] 2. Put the solution obtained in step 1 into a centrifuge tube, set the rotation speed to 10000rpm, centrifuge for 10min, and take the supernatant.

[0060] 3. Add petroleum ether and ethyl acetate to the supernatant, and a precipitate appears in the solution.

[0061] 4. Centrifuge the solution in step 3 to obtain a precipitate, put it in an oven at 70°C for drying, and obtain a red fluorescent carbon dot solid.

[0062] Figure 5 This is the transmission electron microscope image and size distribution diagram of the red-light carbon dots, from which it can be seen that the red-light carbon dots are evenly dispersed. It ca...

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Abstract

The invention discloses a preparation method of multicolor fluorescent carbon dots and application of the multicolor fluorescent carbon dots in the aspect of LED (light-emitting diode), and relates to the field of luminescent materials. The efficient multicolor fluorescent carbon dots can be obtained through regulating the proportion and reaction temperature of a reactant. The carbon dots are prepared by the following method: citric acid and urea, in different proportions, are dissolved in N,N-dimethylformamide, the reaction temperature is controlled to be 140 to 200 DEG C to carry out solvothermal reaction, the fluorescent carbon dots with the maximum emission peak covering 400 to 650nm are obtained, and the fluorescent carbon dots with the fluorescence quantum efficiency all being 10% or above are obtained, wherein the blue light is 52%, the green light is 35% and the red light is 13%. The carbon dots can be used as luminescent powder of an LED to be directly added into an encapsulating material epoxy resin of the diode, and used for preparing LED devices with blue light, green light, red light and white light.

Description

technical field [0001] The invention relates to the field of luminescent materials, more specifically, to the preparation and application of multicolor fluorescent carbon dots. Background technique [0002] With the continuous development of nanotechnology, carbon materials have made more and more contributions. Carbon nanodots (referred to as carbon dots) have attracted the attention of researchers due to their small particle size, low toxicity, good water solubility, superior fluorescence properties and strong photostability. Although there are a large number of literatures on carbon dots, there are still many experimental and theoretical problems to be solved. How to find cheaper, green and environmentally friendly raw materials, how to use simpler, safer and more efficient synthesis methods, how to achieve multicolor luminescence of carbon dots, how to broaden the application range of carbon dots, etc., all these require researchers to continue to explore. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00H01L33/50H01L33/52
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65H01L33/502H01L33/52
Inventor 苗湘孙再成
Owner BEIJING UNIV OF TECH
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