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Dual-emission solid yellow-light carbon quantum dot and preparation method thereof

A technology of carbon quantum dots and double emission, applied in the field of fluorescent light-emitting materials

Active Publication Date: 2020-05-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, most of the solid-state fluorescent carbon quantum dots that can be prepared at present emit short wavelengths such as blue-green light, and exhibit single-peak emission, such as Jiang et al. (Jiang B P, Yu Y X, Guo X L, et al. White-emitting carbondots with long alkyl-chain structure: Effective inhibition of aggregation caused quenching effect for label-free imaging of latent fingerprint[J].Carbon, 2018, 128: 12-20.) With long-chain alkyl-containing Tween80 as a single raw material, through one-step CDs were synthesized by the method, the luminescence wavelength of the solid powder is 440nm, and the fluorescence quantum yield is only 2.0%.
However, there are few reports on carbon quantum dots with double-peak emission.

Method used

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  • Dual-emission solid yellow-light carbon quantum dot and preparation method thereof
  • Dual-emission solid yellow-light carbon quantum dot and preparation method thereof
  • Dual-emission solid yellow-light carbon quantum dot and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 1.6214 g of phloroglucinol dihydrate, 100 µL of ethylenediamine and 1.8552 g of boric acid into 10 mL of distilled water, and sonicate for 3 min to obtain a uniformly dispersed reaction solution.

[0034] The reaction solution was placed in a microwave oven, and heated at a power of 400W for 15 minutes. After the reaction is finished, cool to room temperature to obtain double emission solid yellow fluorescent carbon quantum dots.

[0035] figure 1 It is the TEM photo of the prepared dual emission solid yellow fluorescent carbon quantum dots. It can be seen from the figure that the carbon quantum dots are uniformly dispersed and no agglomeration occurs. It can also be seen from the partial HRTEM photos in the figure that the carbon quantum dots have obvious lattice fringes with a crystal plane spacing of 0.21nm, corresponding to the (100) crystal plane of graphite, and have a graphite-like structure.

[0036] figure 2 The particle size distribution diagram of th...

Embodiment 2

[0045] Add 1.6214 g of phloroglucinol dihydrate, 66.7 µL of ethylenediamine, and 1.2368 g of boric acid into 10 mL of distilled water, and sonicate for 3 min to obtain a uniformly dispersed reaction solution.

[0046] The reaction solution was placed in a microwave oven, and heated for 20 minutes with a power of 250W. After the reaction is finished, cool to room temperature to obtain double emission solid yellow fluorescent carbon quantum dots.

[0047] according to Figure 10 It can be seen from the fluorescence spectrum diagram that the double emission solid yellow fluorescent carbon quantum dot prepared in this embodiment has strong fluorescence emission peaks at 489nm and 579nm at an excitation wavelength of 365nm.

[0048] Figure 11 In the color coordinate diagram of the double-emission solid-state yellow fluorescent carbon quantum dot, its color coordinates are x=0.37, y=0.43, which belongs to the yellow light region.

Embodiment 3

[0050] Add 1.6214 g of phloroglucinol dihydrate, 100 µL of ethylenediamine, and 1.546 g of boric acid into 10 mL of distilled water, and sonicate for 3 min to obtain a uniformly dispersed reaction solution.

[0051] The reaction solution was placed in a microwave oven, and heated at a power of 600W for 10 minutes. After the reaction is finished, cool to room temperature to obtain double emission solid yellow fluorescent carbon quantum dots.

[0052] according to Figure 12 It can be seen from the fluorescence spectrum diagram that the double emission solid yellow fluorescent carbon quantum dots prepared in this embodiment have strong fluorescence emission peaks at 480nm and 571nm at an excitation wavelength of 365nm.

[0053] Figure 13 In the color coordinate diagram of the double-emission solid-state yellow fluorescent carbon quantum dot, its color coordinates are x=0.38, y=0.45, which belongs to the yellow light region.

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Abstract

The invention relates to a dual-emission solid yellow-light carbon quantum dot and a preparation method thereof. The preparation method comprises the following step: with phloroglucinol as a carbon source, ethylenediamine as a nitrogen source and boric acid as a boron source, carrying out a heating reaction in an aqueous medium under normal pressure to prepare the carbon quantum dot. The carbon quantum dot with bright yellow fluorescence and double-peak emission in a solid state is prepared; with the unique double-peak emission, the carbon quantum dot is applicable as fluorescent powder for preparation of a white light emitting diode; and due to the fact that the carbon quantum dot covers a wide light emitting range, the color rendering property of the light emitting diode can be improved.

Description

technical field [0001] The invention belongs to the technical field of fluorescent light-emitting materials, and relates to a carbon quantum dot, in particular to a carbon quantum dot material capable of emitting strong yellow fluorescence in a solid state, and a preparation method of the carbon quantum dot. Background technique [0002] When materials enter the nanoscale range, they will have quantum size effects, surface effects and other characteristics, thus showing physical and chemical properties that are very different from ordinary materials. Carbon nanomaterials have various forms and have the advantages of excellent electrical conductivity, good biocompatibility, stable chemical properties and large specific surface area, and are widely used in the fields of nanoelectronics, optics, catalytic chemistry, biomedicine and sensors. application. [0003] Carbon quantum dots (carbon quantum dots, CQDs) generally refer to a new fluorescent carbon nanomaterial with a part...

Claims

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Application Information

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IPC IPC(8): C01B32/15B82Y20/00C09K11/65H01L33/50
CPCC01B32/15B82Y20/00C09K11/65H01L33/502Y02B20/00
Inventor 杨永珍王军丽郑静霞李强刘旭光许并社
Owner TAIYUAN UNIV OF TECH
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