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Method for purifying halide perovskite quantum dots based on dimethyl silicone oil

A technology of halide perovskite and dimethyl silicone oil, which is applied in the field of quantum dot technology, can solve the problems of low yield and reduced luminous efficiency, and achieve increased yield and stability, improved photoluminescence efficiency, and cheap raw materials Effect

Active Publication Date: 2022-07-29
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used direct centrifugation method, the yield is too low
And centrifuged products with ethyl acetate or methyl acetate, the luminous efficiency will be reduced

Method used

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  • Method for purifying halide perovskite quantum dots based on dimethyl silicone oil
  • Method for purifying halide perovskite quantum dots based on dimethyl silicone oil
  • Method for purifying halide perovskite quantum dots based on dimethyl silicone oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 (according to method one):

[0038] CsPbI synthesized by thermal injection 3 Take 1 mL of the crude quantum dot solution, add 1 mL of dimethicone with a viscosity of 100 cs and 1 mL of n-hexane, and shake to obtain a mixed solution. The mixed solution was centrifuged at 8500 rpm / min for 5 min, the supernatant was discarded, and the precipitate was dissolved in 1 mL of n-hexane.

[0039] The component in the described 1mL crude solution mainly includes CsPbI 3 Quantum dots, 1-octadecene solvent, oleylamine, oleic acid and other ligands.

Embodiment 2

[0048] Embodiment 2 (according to method two): CsPbBr synthesized by room temperature synthesis 3 3 mL of quantum dot solution was taken out, 1 mL of dimethyl silicone oil with a viscosity of 100 cs was added, and a mixed solution was obtained by shaking. The mixed solution was centrifuged at 8000 rpm / min for 5 min, and the precipitate was dissolved in 1 mL of xylene.

[0049] like figure 2 shown, figure 2 a is the result of direct centrifugation of the crude solution of quantum dots; figure 2 The b in it is a photo of the result of purifying the crude solution of quantum dots with dimethicone. It can be seen that the amount of the purified product based on simethicone is also higher than the amount of the product obtained by direct centrifugal purification.

[0050] like Figure 5 As shown, the purified product was dissolved in 1 mL of xylene and stored at room temperature for more than five months, and the luminescence intensity remained about 60%.

Embodiment 3

[0051] Example 3: In addition to the CsPbI of method one in step 1 3 The crude solution of quantum dots was changed to CsPbBr 3 Quantum dot solution, others are the same as Example 1.

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Abstract

The invention relates to a method for purifying halide perovskite quantum dots based on dimethyl silicone oil. The method comprises the following steps: step 1, adding simethicone or simethicone and an organic solvent into a quantum dot coarse solution, and carrying out oscillation mixing to obtain a mixed solution; 2, centrifuging the mixed solution obtained by the method I or the method II in the step 1; and step 3, adding the precipitate obtained after centrifugation in the previous step into a second organic solvent for dissolving to obtain a purified solution of the perovskite quantum dots. According to the invention, the halide perovskite quantum dot product with stable performance and greatly improved yield can be obtained; and the stability and the photoluminescence efficiency of the product are greatly improved due to the surface passivation effect of the simethicone.

Description

technical field [0001] The invention belongs to the technical field of quantum dot technology, and specifically relates to the use of dimethyl silicone oil to purify different halide perovskite quantum dots synthesized by different methods, so as to improve the yield, stability and efficiency thereof. Background technique [0002] At present, there are two main methods for the synthesis of halide perovskite quantum dots. The first is thermal injection, which relies on fast nucleation rates at high temperatures. Generally, metal halides are dissolved in non-polar solvents, and under high temperature conditions, with the help of ligands, the precursors are rapidly injected at higher temperatures to induce nucleation. Room temperature synthesis is another promising method for synthesizing halide perovskites, and quantum dots take advantage of the difference in solubility of perovskites in good and poor solvents. For example, cesium halide and lead halide are dissolved in a go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00Y02E10/549
Inventor 孙春张虎
Owner HEBEI UNIV OF TECH
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