Carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties, and synthesis and application thereof

Abstract

The invention provides carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties. The carbon quantum dots can generate fluorescence under the excitation of ultraviolet light with the wavelength of 315-475nm, wherein the fluorescence intensity reaches the maximum when the excitation wavelength is 375nm. The particle size distribution range of the carbon quantum dots is 2-6nm. The brand-new carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties are synthesized from isocyanate under the action of microwaves. The carbon quantum dots have high yield, are oil-soluble, and can be compounded into a polymer material in situ without aggregation. The structure of the carbon quantum dots contains certain amounts of O, N and other heteroatoms with lone electron pairs, thereby increasing the transition probability from singlet state to triplet state under excitation. Meanwhile, the matrix performs the functions of reducing the nonradiative transition and quenching the triplet-state oxygen, so that the prepared carbon quantum dots have the visible stable room-temperature phosphorescence and delayed fluorescence properties in the matrix.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for the production of very small particles called CQs (Cold Quantum Dot) at an extremely fast rate while also giving them their unique property - they emit light when stimulated or interacted with another substance. These tiny objects make up different types of molecules such as organic chemicals like ammonia nitrogen oxides NOx). They help reduce air pollution caused by these emissions.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency of producing high brightness light emitting diodes (LED), specifically those made from carbon quantum dot material(CQD). Current methods involve synthesis processes involving multiple chemical reactions, leading to waste products and increased costs associated with manufacturing these devices. Additionally, current techniques require specific starting materials like selenium, tellurium, sulfur, lead, copper, silver, gold, zinc oxide, manganese nitrogen, magnesia, ceramics, glassy carbons, polymers, rubber, resins, siloxanes, epoxy resin systems, polyimides, polysilane films, plasticizers, solvents, lubricants, adhesives, coatings, wires, sensors, optic fibers, electronic components, batteries, solar cells, photovoltaics, fuel cell eletrodes, catalyst supports, energy storage carriers, electron transport layers, and other applications related to carbon quantum point chemistry.

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