Novel preparation method for ternary alloy type CdSeS quantum dots

Abstract

The invention provides a novel preparation method for ternary alloy type CdSeS quantum dots, which includes the following steps: mixing long-chain fatty acid cadmium with long-chain trialkylamine to obtain a precursor solution A; mixing trialkyl phosphine selenium, trialkyl phosphorus sulfide and trialkyl phosphine oxide to obtain a solution B, injecting the solution B in the precursor solution A for reaction, so as to obtain a CdSeS quantum dot solution C, removing non-reacted reactants, impurities and the long-chain trialkylamine as a solvent, and obtaining CdSeS quantum dot powder. The novel preparation method has the benefits that the preparation technology is simple, good safety, stability and repeatability are realized, the cost is low, high-quality quantum dots can be prepared in a large-scale manner; the optical property of the prepared quantum dots is stable, the spectroscopic property is excellent, the photoluminescence spectra are continuous and adjustable; the chemical reaction of the preparation method is limited in one container, the operation is simple, precise control of the reaction conditions is easier, and proprieties of products in batch production are more stable.

Description

technical field [0001] The invention belongs to the field of industrial manufacturing of quantum dot materials, and in particular relates to a new preparation method of ternary alloy type CdSeS quantum dots. Background technique [0002] Quantum dots (Qds), also known as quasi-zero-dimensional semiconductor nanocrystals (semi conductor nanocrystal), are nanocrystals composed of II-VI or III-V chemical elements. Due to the nanoscale effect, electrons and holes are quantum-confined. When the diameter is smaller than the Bohr diameter, quantum dot nanoparticles change from a continuous energy level to a discrete energy level structure with molecular characteristics. Therefore, after receiving energy (excitation), it can emit light of a specific wavelength. The reason why quantum dot research has been valued by the scientific and industrial circles, especially in the fields of biomedicine, anti-counterfeiting, LED, and solar cells, is that its unique photoluminescent properties...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that in the existing synthesis of CdSeS quantum dots, the reaction will produce a "popping" phenomenon and the reproducibility of the final quantum dots is poor due to the strong reducibility of trihydrocarbyl phosphine, we have designed a method that uses trialkylselenophosphine, trialkylthiophosphine and The stock solution B is obtained after the trialkylphosphine oxide is mixed, and the stock solution B is injected into the precursor solution A mixed with long-chain fatty acid cadmium and long-chain trialkylamine to react a new method for synthesizing CdSeS quantum dots, because the trialkyl The reaction of selenophosphine, trialkylthiophosphine and trialkylphosphine oxide with long-chain fatty acid cadmium does not generate water, thus avoiding the danger and inconvenience caused by the "burst" phenomenon at very high temperature (250-350°C), At the same time, trialkylselenophosphine, trialkylthiophosphine, and trialkylphosphine oxide have no strong reducing properties, have good stability in the air, ensure the repeatability of the experiment, and will not produce impurities due to reaction with air , it is also safer during storage and transportation, and the cost is lower

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