Multi-optical-performance carbon dot as well as preparation method and application thereof

Abstract

The invention discloses a multi-optical-performance carbon dot and a preparation method and application thereof. The carbon dot comprises a core state used for emitting blue light and a surface state distributed on the surface of the core state and used for emitting red light. According to the invention, 1,2-phenylenediamine serves as a carbon and nitrogen source, aluminum chloride hexahydrate serves as a catalyst, and an in-situ solvent-free catalysis-aided heating strategy is used so as to synthesize the light gray solid carbon dot; the light gray solid carbon dot emits blue fluorescence under excitation of 365-nm ultraviolet light, and yellow phosphorescence is displayed after an excitation light source is extinguished; and the light gray quantum dot is dissolved in a dimethyl sulfoxide or N,N-dimethylformamide solvent, the fluorescence of the formed solution changes from blue to red, and near-infrared emission is achieved. The raw materials and the catalyst used for preparing the carbon dot are cheap and easy to obtain, tedious pretreatment and purification processes are not needed, the preparation process is energy-saving and time-saving, production and preparation can be expanded, and the dot has industrial application prospects.

Description

technical field [0001] The invention belongs to the preparation of carbon-based nano-luminescent materials, and in particular relates to a carbon dot with multiple optical properties, a preparation method and an application. Background technique [0002] Carbon dots are generally defined as zero-dimensional spherical carbon nanoparticles with a particle size of less than 10 nm. Carbon dots are prepared from a wide range of raw materials, simple preparation methods, good optical stability, rich surface groups, and low toxicity of carbon-based materials. It also has unique properties such as optical tunability, photobleaching resistance, good water solubility and biocompatibility. However, the existing preparation of carbon dots usually encounters the following problems: 1) the emission of carbon dots is generally in the red and green light region; 2) the fluorescence of carbon dots will be greatly quenched when they are dried into powder; 3) it is difficult to prepare phospho...

AI Technical Summary

Problems solved by technology

However, the existing preparation of carbon dots usually encounters the following problems: 1) the emission of carbon dots is generally in the red and green light region; 2) the fluorescence of carbon dots will be greatly quenched when they are dried into powder; 3) it is difficult to prepare phosphorescent carbon dots at room temperature; 4 ) The optical properties of carbon dots are single

However, doping with too much concentration of carbon dots using these methods will still lead to fluorescence quenching, and the obtained fluorescence performance is still single.

Images