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Realization method of cation exchange of lead halide perovskite quantum dot materials

A quantum dot material and cation exchange technology, applied in luminescent materials, chemical instruments and methods, nanotechnology, etc., to achieve strong operability, easy temperature control, and solve the effect of lead toxicity

Active Publication Date: 2019-08-13
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no effective method for the realization of lead ion exchange in lead halide perovskite materials.

Method used

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  • Realization method of cation exchange of lead halide perovskite quantum dot materials
  • Realization method of cation exchange of lead halide perovskite quantum dot materials
  • Realization method of cation exchange of lead halide perovskite quantum dot materials

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Experimental program
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Effect test

Embodiment 1

[0045] The processing flow of a method for realizing the cation exchange of a lead halide perovskite material proposed in the embodiment of the present invention includes the following processing steps:

[0046] Step 1, weigh Cs 2 CO 3 Put it into reaction bottle A, add octadecene and oleic acid in reaction bottle A, the volume ratio of octadecene and oleic acid is between 100:7 and 100:9, that is, greater than or equal to 100:7, less than or Equal to 100:9, the best ratio is 100:8. The different proportions of octadecene and oleic acid will seriously affect the shape and structure of the material. The shape, particle size and composition of the material system have very strict requirements on the parameters of the experiment.

[0047] Cs in reaction flask A after addition of octadecene and oleic acid 2 CO 3 The concentration is 0.02-0.03g / mL, argon gas is passed into the three-necked bottle A, and the reaction bottle A is stirred for 5-10 minutes; the argon gas in the rea...

Embodiment 2

[0065] CsPbCl 3 and Mn 2+ Cation exchange reaction:

[0066] Step 1. Weigh 0.4g of Cs 2 CO 3 Put it into the three-necked bottle A, add 15mL of octadecene and 1.2mL of oleic acid, stir and pass through argon for 5min;

[0067] Step 2, 0.188mmol purity is 99.999% PbCl respectively 2 and MnCl 2 Add to 50mL three-neck flasks B and C, add 5mL of octadecene each, stir and pass through argon for 5min;

[0068] Step 3. Heat the three-neck bottles A, B, and C to 120°C at the same time, and keep the temperature for 30 minutes after the temperature stabilizes at 120°C;

[0069] Step 4. After the heat preservation is over, add 0.5mL of oleic acid and oleylamine to bottles B and C respectively, and continue to heat up to 150°C. 2 and MnCl 2 Fully dissolved respectively;

[0070] Step 5. After the heat preservation is over, take 0.6ml of the solution in bottle A and drop it into bottle B. After 10s, blue-emitting CsPbCl is generated. 3 Perovskite quantum dot materials;

[0071] ...

Embodiment 3

[0074] CsMnCl 3 and Pb 2+ Cation exchange reaction:

[0075] Step 1. Weigh 0.4g of Cs 2 CO 3 Put it into the three-neck flask A, add 15mL of octadecene and 1.2ml of oleic acid, stir and pass argon for 5min;

[0076] Step 2, 0.188mmol purity is 99.999% PbCl respectively 2 and MnCl 2 Add to 50mL three-neck flasks B and C, add 5mL of octadecene each, stir and pass through argon for 5min;

[0077] Step 3. Heat the three-neck bottles A, B, and C to 120°C at the same time, and keep the temperature for 30 minutes after the temperature stabilizes at 120°C;

[0078] Step 4. After the heat preservation is over, add 0.5mL of oleic acid and oleylamine to bottles B and C respectively, and continue to heat up to 150°C. 2 and MnCl 2 Fully dissolved respectively;

[0079] Step 5. After the heat preservation is over, take 0.6mL of the solution in bottle A and drop it into bottle C. After 10s, CsMnCl is generated 3 ;

[0080] Step 6, the PbCl dissolved in bottle B 2 The precursor is...

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Abstract

The invention provides an achievement method of cation exchange of a lead halide perovskite quantum dot material. The method includes the steps of: 1) adding Cs2CO3, octadecene and oleic acid into a reaction bottle A, and feeding argon with stirring; 2) adding PbCl2 and octadecene into a reaction bottle B and feeding argon with stirring; 3) adding MnCl2 and octadecene into a reaction bottle C and feeding argon with stirring; 4) heating the reaction bottles A, B and C, adding oleic acid and oleylamine into the reaction bottles B and C, and continuously heating the reaction bottles B and C; 5) adding the solution in the reaction bottle A to the solution in the reaction bottle B, so that after a reaction is carried out in the reaction bottle B for a preset time, a CsPbCl3 perovskite quantum dot material solution is produced; 6) adding the solution in the reaction bottle C to the solution in the reaction bottle B to carry out a cation exchange reaction in the reaction bottle B to generate Cs(Pb<1-x>Mn<x>)Cl3. The method, on the basis of not damaging the appearance of the lead halide perovskite quantum dot material, can control the ratio of lead in the lead halide perovskite quantum dot material, so that a problem of lead poisoning of the lead halide perovskite quantum dot material can be solved.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method for realizing cation exchange of lead halide perovskite quantum dot materials. Background technique [0002] Due to its excellent photoelectric properties, lead halide perovskite has been extensively applied in the fields of photovoltaics and optoelectronics, and breakthrough research results have been achieved. The lead element in lead halide perovskite materials is a heavy metal with toxicity, which seriously restricts its development in the application field. Therefore, the study of lead-free perovskite materials has become a research hotspot, but the stability of lead-free perovskite materials is extremely poor and it is difficult to realize the application. [0003] The preparation method of lead halide perovskite nanomaterials is usually solvothermal synthesis, and CsPbCl was prepared by heat injection solvent reaction method. 3 and CsMnCl 3 quantum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y40/00
CPCB82Y40/00C09K11/665
Inventor 乔泊高迪赵谡玲申朝晖宋鹏杰曹婧玥梁志琴徐征宋丹丹徐叙瑢
Owner BEIJING JIAOTONG UNIV
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