Aqueous-phase synthesis method of Cu-doped Zn1-xCdxS quantum dot and core/shell structure thereof

Abstract

The invention discloses an aqueous-phase synthesis method of a Cu-doped Zn1-xCdxS quantum dot and a core / shell structure thereof. The method comprises the following steps of directly dissolving cadmium ion sources, copper ion sources and zinc ion sources into water, adding a stabilizer, namely sulfhydryl compound, adding a sulfur source under a certain pH value and heating under the protection of inert gases to prepare the Cu-doped Zn1-xCdxS quantum dot; jacketing the Cu-doped Zn1-xCdxS quantum dot with ZnS through a secondary injection method to obtain a Cu:Zn1-xCdxS / ZnS core / shell quantum dot. The method has the advantages of low cost, good operability, good repeatability and low requirements on equipment conditions. The Cu:Zn1-xCdxS / ZnS core / shell quantum dot prepared by the method has excellent luminescence property and good fluorescence stability, is suitable for optoelectronic devices such as solid state lighting, solar cells, displays and the like and is also suitable for being widely applied in bio-labeling, imaging and the like due to good water solubility.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a Cu-doped Zn 1-x Cd x Aqueous Phase Synthesis of S(0≤x≤1) Quantum Dots and Their Core / Shell Structures. Background technique [0002] Quantum dots can also be called semiconductor nanocrystals. The particle size is generally between 1 and 10nm, and the quantum effect is obvious, which leads to its physical and chemical properties that are different from microscopic atoms and molecules, and different from macroscopic objects. Between microscopic and macroscopic objects, it shows many unique properties and laws different from traditional materials. Such as quantum confinement effect, small size effect, surface effect, tunnel effect, dielectric confinement effect, etc. At the same time, quantum dots have important application value in biology, optoelectronic functional devices and quantum light-emitting devices. By introducing impurities into the lattice of semi...

AI Technical Summary

Problems solved by technology

However, the economic cost of synthesizing the quantum dots in the organic phase is high, and the reaction conditions are relatively harsh, requiring a high reaction temperature, which inevitably causes large energy consumption and is not suitable for industrial scale production.

Since the quantum dots are prepared in the organic phase, the product is not water-soluble and cannot be directly applied to fields such as biological imaging, which will also be greatly limited in biological applications.

At present, there is no low cost, good repeatability, simple operation, environmental protection, and direct use of water as a solvent to synthesize Cu:Zn 1-x Cd x Report on S / ZnS Quantum Dots

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