Red-light carbon dot of high yield and high quantum yield, and preparation method thereof

Abstract

The invention discloses a red-light carbon dot of high yield and high quantum yield, and a preparation method thereof. The preparation method is used for the large-scale synthesis of carbon dots, wherein the carbon dots are emitted within the red-light area (with the peak value thereof between 610-661 nm) and the quantum yield is 76% which is highest at present. The particle sizes of carbon nano particles are within 2-8 nm, and the carbon nano particles are mainly composed of a graphitized carbon core and an amorphous functional group shell. Meanwhile, the carbon nano particles are good in luminous efficiency, solubility and stability in common solvents. As a novel type of red fluorescent materials, the red-light carbon dot has the advantages of low production cost, large-scale preparation, extremely high luminous efficiency, good stability and other excellent properties. The red-light carbon dot is a most promising material for replacing conventional semiconductor quantum dots and serves as a low-toxicity nano new material in the fields of optoelectronic devices, fluorescent sensing and biological technology.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a red light carbon dot with high yield and quantum yield and a preparation method thereof. Background technique [0002] The 21st century is an era full of opportunities and challenges. It puts forward higher requirements for the development of information, energy, environment, and national defense, and thus requires the development of materials to keep pace with each other. Among them, the miniaturization and intelligentization of devices require the size of materials to be smaller and smaller. Therefore, nanomaterials have rapidly become the research objects that have an important impact on future economic and social development in the field of new material research, and are also the most active in contemporary basic research. closest to the field of practical application. Unlike bulk materials, nanomaterials have many unique properties, one of which is...

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Problems solved by technology

Although thousands of carbon sources and preparation methods have been reported, the optimal excitation and emission wavelengths of most of the prepared carbon nanoparticles are in the blue-green region, while in the long wavelength region, especially the red The absorption and emission in the light region are weak. This bottleneck not only brings serious photodamage to cells and biological tissues in biomedical applications, but also has fatal defects such as tissue penetration ability and low signal resolution. Serious This hinders the application and development of carbon quantum dots in the fields of biomedicine and optoelectronic devices

At present, although there are a few reported carbon quantum dots with red fluorescence, their quantum yields are often lower than 10%, and the emission wavelength usually does not exceed 620nm. What is more serious is that the purification method will involve separation efficiency. Low-tech techniques such as column chromatography and dialysis

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