High-quantum-yield eigenstate-fluorescence-adjustable carbon dot and preparing method and application thereof

Abstract

The invention relates to the field of fluorescence carbon nanomaterials, in particular to a high-quantum-yield eigenstate-fluorescence-adjustable carbon dot and a preparing method and application thereof. Diaminonaphthalene or a hydroxyl, carboxyl, methyl, ethyl, N,N-dimethyl and N,N-diethyl substituted ramification of the diaminonaphthalene and citric acid serve as carbon source precursors, an eigenstate fluorescence carbon dot solution can be obtained through a solvothermal method. The prepared eigenstate fluorescence carbon dot has the beneficial effects of being high in crystallization, high in surface passivation degree, even in nitrogen doping, even in size distribution and the like, and has the wide application prospect.

Description

Technical field [0001] The invention relates to the field of fluorescent carbon nanomaterials, and in particular to carbon dots with high quantum yield and adjustable intrinsic state fluorescence, and a preparation method and application thereof. Background technique [0002] Carbon Dots (CDs), as a new type of carbon nanomaterials with a size of less than 10nm, exhibit low toxicity, good biocompatibility, chemical inertness, stable fluorescence properties, and better surface modification capabilities. Devices, biomedicine, and sensors have broad application prospects. At present, the methods for preparing carbon dots are mainly divided into two categories: top-down and bottom-up. The top-down method generally uses bulk carbon materials as carbon sources, such as graphite, carbon fiber, carbon nanotubes, carbon black, coal, etc., to obtain carbon dots by means of violent oxidation and stripping. The bottom-up method is mainly based on small organic molecules or polymers as carb...

AI Technical Summary

Problems solved by technology

The carbon dots currently reported in the literature often have poor crystallinity, and the surface often contains a large number of defects, which in turn will generate a large number of defect state energy levels, so that the fluorescence of carbon dots is often dominated by the surface defect states, showing that the fluorescence emission peak position varies with the excitation wavelength. Fluorescent properties of defect states that change

For the application of optoelectronic devices such as electroluminescent diodes, the defect state fluorescence of carbon dots greatly limits the effective injection of carriers, making the performance of light-emitting diodes very low, which greatly limits its application in the field of electroluminescent diodes. Applications

[0004] At present, although the excitation-independent intrinsic state fluorescent carbon dots can be prepared using aniline as a precursor, its quantum yield is relatively low (20%).

Using a simple method to prepare carbon dots with high quantum yield and tunable intrinsic state fluorescence whose fluorescence emission peak does not change with the excitation wavelength is still a big challenge

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