Preparation method of luminescence-adjustable copper-doped zinc sulfide quantum dot

Abstract

The invention discloses a preparation method of a luminescence-adjustable copper-doped zinc sulfide quantum dot, and belongs to the technical field of nano-scale solid luminescent material synthesis.The method comprises the following steps: taking zinc acetate as a zinc source, copper sulfate as a copper source, and mercaptopropionic acid or mercaptoacetic acid as a stabilizer and sulfur source,uniformly dispersing the three substances in deionized water, adjusting the pH value to be alkaline to obtain a precursor liquid, carrying out an auxiliary heating reaction through a microwave reactor, and controlling different reaction times to prepare the luminescence-adjustable copper-doped zinc sulfide quantum dot. The obtained quantum dot has uniform particle size, good water solubility and high fluorescence stability, the fluorescence emission peak of the quantum dot is adjustable from 500-595nm, and the quantum dot can be widely applied to the fields of fluorescence sensors, bioimaging,solar cells, construction of optical devices, and the like. Compared with the conventional synthesis method, the preparation method uses the protective agent as the sulfur source, so that the defectsof excessive introduction of sulfur sources, complex operation, environmental pollution and the like are avoided. Through simple mixing of the reaction raw materials, the luminescence-adjustable copper-doped zinc sulfide quantum dot is simply and rapidly prepared after the one-step microwave auxiliary reaction, and the adjustment of the fluorescence emission peak in the width range of 500-595nm is realized by controlling the reaction time.

Description

Technical field: [0001] The invention belongs to the technical field of synthesis of nanoscale solid luminescent materials, and in particular relates to a simple and rapid one-pot method for preparing copper-doped zinc sulfide quantum dots with adjustable luminescence. Background technique: [0002] Quantum dots, due to their unique nanostructure and tunable optical properties, have broad application prospects in biological imaging, biological / chemical sensors, fluorescent probe labeling, solar cells and optoelectronic devices. Compared with traditionally used cadmium-containing quantum dots such as CdSe, CdS, and CdTe, ion-doped ZnS quantum dots, such as Cu-doped ZnS quantum dots, are very promising due to their low toxicity and good photoluminescence properties. Fluorescent materials with potential applications. [0003] At present, there are many methods for preparing Cu-doped ZnS quantum dots, such as solid-phase method, organic synthesis method and liquid-phase method....

AI Technical Summary

Problems solved by technology

(2) Encapsulation and recombination between different quantum dots is an effective method, but the lattice matching, composite structure design and synthesis between quantum dots lead to the successful preparation of only a few composite quantum dots

However, the effect of changing the concentration of dopant ions in the product by only increasing or decreasing the amount of dopant ions in the reactant is not obvious, and the obtained quantum dots often have a single emission wavelength or the emission wavelength is only in a small range. altered quantum dots

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