Preparation method and application of solid fluorescent carbon quantum dot material

Abstract

The invention discloses a preparation method of a solid fluorescent carbon quantum dot material. The preparation method comprises the following steps: first, weighing a proper amount of citric acid, urea and sodium carbonate, and putting the weighed materials into a heat-resistant glass container, wherein the mass ratio of the citric acid to the urea to the sodium carbonate is 1:1:(0.5-1); then, adding distilled water into the container to prepare a transparent solution, wherein the mass-volume ratio of the total mass of the citric acid, the urea and the sodium carbonate to the distilled wateris 80-85 g / 100 mL; and carrying out heating at a temperature of 80-100 DEG C in a microwave oven for 4-6 minutes, taking out the target product, placing the target product in a dark box ultraviolet analyzer, carrying out irradiating with an excitation wavelength of 365 nm to enable the target product to emit yellow-green fluorescence, and carrying out steady-state spectrum testing on the obtainedtarget product, wherein the testing result is that the emission wavelength under an excitation wavelength of 280-480 nm is in a range of 510-530 nm. The prepared solid fluorescent carbon quantum dotscan be applied to preparation of white light emitting diodes, solar cells, lasers and the like.

Description

technical field [0001] The invention relates to the field of preparation of nano-luminescent materials, in particular to a synthesis method of solid-state fluorescent carbon quantum dots. Background technique [0002] In recent years, carbon dots, as a new type of photoluminescent nanomaterial, have attracted the attention of many researchers. Carbon dots are a new type of photoluminescent carbon nanomaterial with a particle size of less than 10nm, which can be dispersed in water or other solvents, and which use carbon as the basic structural unit. Compared with traditional quantum dots and organic dyes, carbon dots It has good water solubility and biocompatibility, low toxicity, light stability, simple preparation and low raw material cost. Based on the above advantages, carbon dots are gradually being used in many fields, such as analysis and detection, cell imaging, drug carriers, biological and chemical sensing, optoelectronic devices, etc. [0003] Since most of the r...

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Problems solved by technology

[0004] The purpose of the present invention is to supplement the prior art, solve the synthesis difficulties existing in the preparation of current solid-state fluorescent carbon quantum dot materials, and the problem that a solid medium is needed to emit light, and provide a synthesis method of solid-state fluorescent carbon quantum dot materials. The above method adopts the method of microwave-assisted synthesis. The raw materials used come from a wide range of citric acid as a carbon source and urea as a nitrogen source. Suitable for mass production, the obtained solid-state fluorescent carbon quantum dots also have the advantages of good biocompatibility, low cytotoxicity, high fluorescence stability, no flash phenomenon, and adjustable excitation and emission wavelengths.

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