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Preparation method of perovskite quantum dot

A quantum dot and perovskite technology, which is applied in the field of preparation of CsPb1-xZnxBr3 perovskite quantum dots, can solve the problems of long reaction time, low ion exchange efficiency, long stirring time, etc., and achieves simple steps, low cost, and equipment. simple effect

Pending Publication Date: 2020-07-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Currently, on Zn 2+ The study of doped quantum dots is mainly through the synthesis of CsPbBr 3 Quantum dots with Zn 2+ The compound is stirred and mixed to carry out cation exchange, but generally the stirring time is very long, the reaction time is very long, and the ion exchange efficiency is low. It is not yet complete to control the composition by artificially introducing different impurity ions during the synthesis of perovskite quantum dots. accomplish

Method used

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  • Preparation method of perovskite quantum dot

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Embodiment 1

[0030] A CsPb 1-x Zn x Br 3 The preparation method of perovskite quantum dots specifically comprises the following steps:

[0031] (1) First weigh 0.164g of Cs according to the ratio of Cs:Pb:Zn=2:1:1 2 CO 3 , 0.185g of PbBr 2 and 0.113g of ZnBr 2 Mix and add in the three-necked flask, then inject 2.5ml oleic acid (OA), 2.5ml oleylamine (OLA) and 10ml of 1-octadecene (ODE) with a pipette gun, and utilize nitrogen to blow out the air in the three-necked flask to make The reaction is in a nitrogen protective atmosphere, heated to 120°C, and magnetically stirred for 15 minutes. Immediately after the reaction is completed, an ice-water bath is carried out to synthesize CsPb 1-x Zn x Br 3 Perovskite quantum dots;

[0032] (2) to the CsPb after generating according to above-mentioned steps (1) 1-x Zn x Br 3 The perovskite quantum dots are separated, purified and stored. The above synthesized perovskite quantum dot solution is centrifuged at a speed of 8000rpm for 10min, ...

Embodiment 2

[0038] A CsPb 1-x Zn x Br 3 The preparation method of perovskite quantum dots specifically comprises the following steps:

[0039] (1) The cesium source Cs 2 CO 3 , lead source PbBr 2 and zinc source ZnBr 2 Form mixture after mixing; Wherein the atomic ratio of Cs, Pb, Zn in cesium source, lead source and zinc source is Cs:Pb:Zn=1:0.9:0.1;

[0040] (2) Add oleic acid (OA), oleylamine (OLA) and 1-octadecene (ODE) to the mixture to form a suspension, wherein the zinc source, oleic acid, oleylamine and 1-octadecene The molar volume ratio is 0.5mmol:2ml:2ml:8ml;

[0041] (3) The suspension is heated and reacted in a nitrogen protective atmosphere, and magnetic stirring is performed at the same time. After the reaction is completed, the reaction solution is cooled in an ice-water bath to generate CsPb 1-x Zn x Br 3 Perovskite quantum dots, wherein the temperature of the heating reaction is 90° C., and the time is 15 minutes.

[0042] (4) will contain CsPb 1-x Zn x Br ...

Embodiment 3

[0044] A CsPb 1-x Zn x Br 3 The preparation method of perovskite quantum dots specifically comprises the following steps:

[0045] (1) The cesium source Cs 2 CO 3 , lead source PbBr 2 and zinc source ZnBr 2 Form a mixture after mixing; Wherein the atomic ratio of Cs, Pb, Zn in cesium source, lead source and zinc source is Cs:Pb:Zn=1:0.1:0.9;

[0046] (2) Add oleic acid (OA), oleylamine (OLA) and 1-octadecene (ODE) to the mixture to form a suspension, wherein the zinc source, oleic acid, oleylamine and 1-octadecene The molar volume ratio is 0.5mmol:3ml:3ml:12ml;

[0047] (3) The suspension is heated and reacted in a nitrogen protective atmosphere, and magnetic stirring is performed at the same time. After the reaction is completed, the reaction solution is cooled in an ice-water bath to generate CsPb 1-x Zn x Br 3 Perovskite quantum dots, wherein the temperature of the heating reaction is 120° C., and the time is 20 minutes.

[0048] (4) will contain CsPb 1-x Zn x ...

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Abstract

The invention relates to a preparation method of a CsPb1-xZnxBr3 perovskite quantum dot. The method comprises the following steps: 1, mixing a cesium source, a lead source and a zinc source in a three-neck flask; then injecting oleic acid (OA), oleylamine (OLA) and 1-octadecene (ODE), under the protection of nitrogen atmosphere, performing heating and magnetic stirring to fully react, after the reaction is finished, applying ice-water bath treatment, performing centrifugal washing to obtain CsPb1-xZnxBr3 perovskite quantum dots, and finally dispersing the quantum dots into n-hexane to be stored. The CsPb1-xZnxBr3 perovskite quantum dot prepared by adopting the method has the characteristics of high crystallization quality, high PL luminous intensity and high PL quantum yield up to 57%, andcan be applied to the fields of illumination, display, photovoltaics and the like.

Description

technical field [0001] The invention relates to the field of quantum dot materials, in particular to a CsPb 1-x Zn x Br 3 Preparation method of perovskite quantum dots. Background technique [0002] As a new type of light-emitting material, perovskite quantum dots have attracted widespread attention due to their high quantum efficiency of up to 90%, fine-tuning of PL wavelengths in the entire visible range, etc., and are widely used in solar cells, light-emitting diodes, fields of biomedicine. In recent years, material research workers have done a lot of research on the preparation and performance of perovskite quantum dots, but the obtained quantum dots have poor chemical stability in polar solvents and air environments, and they cannot withstand the attack of external light or heat. It is easy to agglomerate or decompose under the environment, resulting in the degradation or quenching of quantum dot luminescence performance, and its performance in terms of anti-photose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00
Inventor 王凤超彭小改陈进张灿云孔晋芳杨波波李澜
Owner SHANGHAI INST OF TECH
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