Red-light emission fluorescent carbon dot with up and down conversion function and preparation method of red-light emission fluorescent carbon dot

A fluorescent carbon dot and conversion function technology, applied in the fields of chemistry and material science, can solve the problems of low quantum yield of carbon dot fluorescence emission, and achieve the effects of easy industrial production, improved resolution, and convenient operation

Active Publication Date: 2015-01-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many known synthesis methods of carbon dots, most of the best fluorescence emission of the obtained carbon dots is concentrated in the blue light region, and the fluorescence emission quantum yield of the prepared carbon dots is also low.

Method used

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  • Red-light emission fluorescent carbon dot with up and down conversion function and preparation method of red-light emission fluorescent carbon dot
  • Red-light emission fluorescent carbon dot with up and down conversion function and preparation method of red-light emission fluorescent carbon dot
  • Red-light emission fluorescent carbon dot with up and down conversion function and preparation method of red-light emission fluorescent carbon dot

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 Dissolve citric acid monohydrate in formamide to make a solution with a mass fraction of 5%. Take 15ml of the above solution and place it in a 20ml autoclave, then place the reaction kettle in an oven that has been heated to 180°C, and take out the reaction kettle after keeping it warm for 4 hours. After cooling to room temperature naturally, the reaction solution was centrifuged, and the obtained precipitate was washed 4 times with acetone and methanol respectively, and the finally obtained solid, that is, the target product, was dried in a vacuum oven and sealed for storage. The elemental analysis test shows that the target product obtained in this example is carbon dots. And, the fluorescence spectrum figure of the carbon dot obtained in the present embodiment is as follows figure 1 As shown, the half width of the fluorescence emission peak is narrow, the fluorescence emission peak basically does not change with the wavelength of the excitation light, a...

Embodiment 2

[0037] Example 2 Dissolve citric acid monohydrate in formamide to make a solution with a mass fraction of 10%. Take 15ml of the above solution and place it in a 20ml autoclave, then place the reaction kettle in an oven that has been heated to 150°C, and take it out after 36 hours of heat preservation. After cooling to room temperature naturally, the reaction solution was centrifuged, and the obtained precipitate was washed 4 times with acetone and methanol respectively, and the finally obtained solid, that is, the target product, was dried in a vacuum oven and sealed for storage. The fluorescence spectrum figure of the carbon dots obtained in this embodiment is as follows image 3 As shown, the half width of the fluorescence emission peak is narrow, the fluorescence emission peak basically does not change with the wavelength of the excitation light, and has a large Stokes shift.

Embodiment 3

[0038] Example 3 Sodium citrate was dissolved in formamide to make a solution with a mass fraction of 2%. Take 15ml of the above solution and place it in a 20ml autoclave, then place the reaction kettle in an oven that has been heated to 200°C, and take out the reaction kettle after keeping it warm for 2 hours. After cooling to room temperature naturally, the reaction solution was centrifuged, and the obtained precipitate was washed 4 times with acetone and methanol respectively, and the finally obtained solid, that is, the target product, was dried in a vacuum oven and sealed for storage. The fluorescence spectrum figure of the carbon dots obtained in this embodiment is as follows Figure 4 As shown, the half width of the fluorescence emission peak is narrow, the fluorescence emission peak basically does not change with the wavelength of the excitation light, and has a large Stokes shift.

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Abstract

The invention discloses a red-light emission fluorescent carbon dot with an up and down conversion function and a preparation method of the red-light emission fluorescent carbon dot. The particle size of the carbon dot is 10-50nm; the position of a fluorescence emission peak generated under the irradiation of exciting lights with different wavelengths is 600-670nm; the fluorescence quantum yield is greater than 40%; and the preparation method comprises the following steps: dissolving a carbon precursor into a liquid organic compound to form a mixed reaction solution; heating and carrying out heat preservation to form a brownish red solution; and washing the solid matters separated from the brownish red solution, so as to form the carbon dot. The carbon dot disclosed by the invention has the advantages of up and down conversion and red-light emission, high fluorescence quantum yield and relatively large stokes shift, and has a wide application prospect in the fields such as fluorescent tag imaging, drug delivery, disease diagnosis, analysis detection and the like; and meanwhile, the preparation process is simple and rapid, convenient to operate, high in yield, free of complicated and expensive equipment, low in cost, and easily achieves large-scale production.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a red light-emitting fluorescent carbon point with an up-down conversion function and a preparation method thereof, belonging to the fields of chemistry and material science. Background technique [0002] Carbon dots have aroused widespread research interest since the Scrivens research group first discovered carbon nanoparticles with fluorescent properties—carbon quantum dots (referred to as carbon dots) in 2004. Similar to traditional semiconductor quantum dots, carbon dots have the advantages of adjustable fluorescence emission, high photostability, wide excitation spectrum and small size. In addition, carbon dots have low toxicity, good biocompatibility, wide source of raw materials and easy functionalization. These advantages make up for the shortcomings of semiconductor quantum dots and traditional organic dyes, making them widely used in analysis an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B31/02
Inventor 张凌林恒伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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