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I-II-III-VI family quantum dots and preparation method thereof

A technology of I-II-III-VI and quantum dots, which is applied in the field of semiconductor nanomaterial preparation, can solve problems such as high cost, complicated operation, and inconvenient synthesis of quantum dots, and achieve high quantum efficiency, high fluorescence efficiency, and good monodispersity sexual effect

Inactive Publication Date: 2011-08-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing I-II-III-VI related work mainly focuses on the preparation of I-II-III-VI quantum dots (cubic structure and hexagonal structure) with different crystal structures. When preparing quantum dots, the system needs to be in a vacuum, and further research is needed. Preparation of unimolecular reactive monomers (cation and anion compounds), these methods will bring a lot of inconvenience to the synthesis of quantum dots, such as high cost and complicated operation
Moreover, from the perspective of material research, the research on the composition and performance relationship of I-II-III-VI quantum dots has not been reported. In this sense, the preparation of high fluorescence efficiency component-controllable I -II-III-VI quantum dots have always been a research hotspot

Method used

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  • I-II-III-VI family quantum dots and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1～21

[0021] Embodiments 1-21 give the method for preparing I-II-III-VI quantum dots.

[0022] Presented here is the invention with different components I a -II b -III c -S ((a+2b+3c) / 2) Quantum dots, wherein a, b and c are arbitrary values ​​greater than zero, namely: 6≥a>1, 6≥b>1, 6≥c>1. The elements constituting group I and group III of the present invention are as follows: I=Ag or / and Cu; II=Zn; III=Ga or / and In. The composition of quantum dots can be expressed as (Ag m Cu 1-m ) a Zn b (Ga n In 1-n )c S ((a+2b+3c) / 2) , where the value of m, n is any value between 0 and 1 including 0 and 1. That is: 1≥m≥0, 1≥n≥0. The remarkable feature of the method of the invention is that the feeding molar ratio of the particles is completely consistent with the composition of the obtained particles.

Embodiment 1

[0024] When m=0, n=0, c=6, the typical synthesized quantum dots are Cu a Zn b In 6 S ((a+2b+18) / 2) : The composition of group I elements and group II elements that make up quantum dots can be adjusted arbitrarily:

[0025] When a:b>1, a typical quantum dot Cu 2 Zn 6 S 11 A synthetic example is as follows:

[0026] First, add 3ml of octadecene, 0.2mmol of copper acetate, 0.1mmol of zinc acetate, 0.6mmol of indium acetate, 2.2mmol of octadecanoic acid and 2.2mmol of dodecylmercapto into the reaction flask, and then the solution is heated to a temperature between 150 and 240 degrees. temperature, 1.1mmol elemental sulfur (dissolved in 1.1ml oleylamine) was quickly injected into the reaction solution and kept for 20 minutes to prepare Cu 2 Zn 6 S 11 quantum dots.

Embodiment 2

[0028] When m=0, n=0, c=1, the typical synthesized quantum dots are Cu a Zn b InS ((a+2b+3) / 2)) : The composition of group I elements and group II elements that make up quantum dots can be adjusted arbitrarily:

[0029] When a:b=1, a typical quantum dot CuZnInS 3 A synthetic example is as follows:

[0030] First, add 3ml of octadecene, 0.1mmol of copper acetate, 0.1mmol of zinc acetate, 0.1mmol of indium acetate, 0.6mmol of octadecanoic acid and 0.6mmol of dodecylmercapto into the reaction flask, and then the temperature of the solution is raised to any temperature between 150 and 240 degrees. temperature, 0.3mmol elemental sulfur (dissolved in 0.3ml oleylamine) was quickly injected into the reaction solution and kept for 20 minutes to obtain CuZnInS 3 quantum dots.

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Abstract

The invention discloses I-II-III-VI family quantum dots and a preparation method thereof, belonging to the technical field of preparation of a semiconductor nanomaterial. The quantum dots are specifically shown as (CumAg1-m)aZnb(InnGa1-n)cSd; the molar ratio of a copper element to a silver element in an I family is (1-m):m; m is more than or equal to 0 and less than or equal to 1; the molar ratio of an indium element to a gallium element in an III family is (1-n):n; and n is more than or equal to 0 and less than or equal to 1. The preparation method comprises the following steps of: dissolving cationic monomers and ligands of Cu or / and Ag, Zn, In or / and Ga in a non-coordinated solvent to obtain a ligand-cationic monomer complex compound; heating the ligand-cationic monomer complex compound and injecting an anionic monomer of S which is dissolvable in oleyl amine to obtain the quantum dots; and precipitating in acetone or ethanol and dispersing into a chloroform or hexane solvent. The quantum dots disclosed by the invention have very high quantum efficiency, excellent monodispersity, excellent stability and controllable particle composition; the sizes of particles do not need to be selected; and the preparation method is easy to operate and has low cost.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nano material preparation. It involves preparing quantum dots with controllable size, adjustable components, high fluorescence efficiency, stable physical and chemical properties by adjusting temperature and component ratio. Background technique [0002] When the size of the semiconductor crystal is small to a certain extent (1-20 nanometers), the electronic energy level near the Fermi level changes from the original quasi-continuous state to a discontinuous state. This phenomenon is called the quantum size effect. Correspondingly, its properties mainly depend on the size of the crystals. Typical semiconductor nanocrystals, that is, quantum dots, mainly include groups II-VI, III-V and IV-VI. These quantum dots all exhibit pronounced quantum size effects, with properties significantly different from their bulk counterparts. For example, the optical properties of quantum dots depend on the ...

Claims

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Application Information

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IPC IPC(8): C09K11/62
Inventor 解仁国张杰杨文胜
Owner JILIN UNIV
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