A method of controlling the size distribution of pbs or pbse quantum dots

A technology of size distribution and quantum dots, which is applied in the field of compound semiconductor nanomaterial preparation, can solve the problems of difficult to find suitable reactivity and low chemical yield, and achieve the effect of low cost, simple operation process and low environmental requirements
CN106882837BInactive Publication Date: 2018-09-21HUAZHONG UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2018-09-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for controlling PbS or PbSe quantum dot size distribution. The method comprises the following steps that: (1) first, CdSe (or CdS) quantum dots with larger sizes are injected into a precursor of lead, and PbSe (or PbS) quantum dots with larger sizes are obtained through a cation exchange reaction at the moment; (2) then, CdSe (or CdS) quantum dots with smaller sizes are continuously injected, and the PbSe (or PbS) quantum dots with smaller sizes are obtained through the cation exchange reaction at the moment; (3) finally, the size distribution of the PbSe (or PbS) quantum dots becomes narrower and narrower under the action of Ostwald ripening effect, so that the size distribution of the PbSe (or PbS) quantum dots is controlled. Through the method, various sizes of the PbSe (or PbS) quantum dots with extremely good size distribution can be obtained; moreover, the PbSe (or PbS) quantum dots are specifically stable in air; the method is low in cost, easy to operate, and not strict in environment requirement.
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Description

technical field

[0001] The invention belongs to the technical field of preparation of compound semiconductor nanometer materials, and in particular relates to a method for controlling the size distribution of PbS or PbSe quantum dots. Background technique

[0002] Semiconductor quantum dots are quasi-zero-dimensional nanomaterials. When the particle size enters the nanoscale, size confinement will cause size effects, quantum confinement effects, macroscopic quantum tunneling effects, and surface effects, thus deriving nanosystems different from The low-dimensional physical properties of macroscopic and microscopic systems exhibit many physical and chemical properties different from macroscopic materials.

[0003] Because the various characteristics of quantum dots are closely related to the size of quantum dots, for example, the half-width of the absorption spectrum and emission spectrum of quantum dots will become narrower as the size distribution of quantum dots becomes sm...

Claims

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