A method for large-scale preparation of highly efficient red/near-infrared emitting fluorescent carbon dots

Abstract

The invention discloses a method for large-scale preparation of high-efficiency red / near-infrared emitting fluorescent carbon dots, that is, o-phenylenediamine and inorganic metal salts are ground into powders with uniform particles, and the mixed powder of o-phenylenediamine and inorganic metal salts or o-phenylenediamine The mixture of phenylenediamine and dilute hydrochloric acid is transferred to the inner lining of the reaction kettle, then packaged, transferred to the drying box, and the reaction temperature and reaction time are set. After the reaction is complete, the temperature of the drying box is cooled to room temperature, and the reaction kettle is taken out. The product is obtained; the product is washed and dried. Compared with the prior art, the reaction of the present invention is simple and convenient, without purification, low cost, convenient for large-scale production, good environmental stability, convenient storage and transportation, and the prepared fluorescent carbon dots have excellent red fluorescence performance, and have four-photon Fluorescent properties, and for the first time realized the fluorescence emission of carbon dots in the third near-infrared window; carbon dot products can meet the production requirements of various optoelectronic devices without complicated modification in the later stage.

Description

technical field [0001] The invention belongs to the technical field of fluorescent carbon dot preparation methods, and in particular relates to a method for large-scale preparation of highly efficient red / near-infrared emitting fluorescent carbon dots. Background technique [0002] Nowadays, nanomaterials have gradually entered various fields of our lives. A variety of carbon-based fluorescent nanomaterials, such as carbon nanodots, fluorescent carbon nanotubes, polymer dots, graphene quantum dots, and nanodiamonds, have been synthesized and applied. Carbon nanomaterials have attracted extensive research by scientists because of their great potential in various technological applications. The excellent electronic and physical and chemical properties of carbon dots have made their optical properties attract great attention from researchers in recent years. [0003] As an emerging fluorescent nanomaterial, carbon dots have great application potential in the fields of chemica...

AI Technical Summary

Problems solved by technology

However, there are still large questions regarding the efficient synthesis of fluorescent carbon dots with infrared and near-infrared emission

[0004] The maximum emission wavelength of the reported red fluorescent carbon dots does not exceed 760nm, and most of the fluorescence efficiency is very low, and the fluorescence intensity is weak, which greatly limits the application of carbon dots in the field of luminescence and biological imaging.

At present, there are few reports on high-efficiency red fluorescent carbon dots. Most of the synthesized carbon dots are almost synthesized in the liquid phase environment, and need to be further purified. The process is very cumbersome and the production cost is relatively high. In order to synthesize efficient red fluorescent carbon dots The researchers used the solvothermal method to control the formation of sp2 domains or modify the surface functional groups of carbon dots to conduct experiments. The efficiency of red carbon dots synthesized by this method is often not high, the environmental stability is poor, and it is difficult to store for a long time, which is not conducive to further research. technology application

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