Preparation and application of a solid-state fluorescent carbon quantum dot material

Abstract

The invention discloses the preparation of a solid fluorescent carbon quantum dot material. First, take an appropriate amount of citric acid, urea and sodium carbonate and put them into a heat-resistant glass container. The mass ratio of the citric acid, urea and sodium carbonate is 1:1:0.5~1; then, add distilled water to the container to form a transparent solution, the mass volume ratio of the total amount of citric acid, urea and sodium carbonate to distilled water is 80~85g / 100mL; ~100°C, after heating for 4-6 minutes, take out the target product, place it in a dark box UV analyzer, and irradiate it with an excitation wavelength of 365nm, which emits yellow-green fluorescence. The obtained target product is subjected to a steady-state spectrum test, and the test results It is: the emission wavelength under the excitation wavelength of 280nm-480nm is 510nm-530nm. The solid fluorescent carbon quantum dots prepared by the invention can be applied to the 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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