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Self-assembly wavelength tuning method of perovskite quantum dots

A wavelength tuning and perovskite technology, which is applied in the field of self-assembly wavelength tuning of perovskite quantum dots, achieves the effect of simple method, easy operation and broad market prospect

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

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a self-assembled wavelength tuning scheme of perovskite quantum dots to solve the technical problems or technical gaps in the prior art

Method used

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  • Self-assembly wavelength tuning method of perovskite quantum dots
  • Self-assembly wavelength tuning method of perovskite quantum dots
  • Self-assembly wavelength tuning method of perovskite quantum dots

Examples

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no. 1 example

[0042] First Example (as a comparative example)

[0043] Step 1: Prepare the Precursor Solution

[0044] At room temperature, 0.5 mmol of lead bromide, 0.5 mmol of cesium bromide, 1 ml of oleic acid and 0.5 ml of oleylamine were added to 10 ml of dimethylformamide solvent to carry out magnetic stirring reaction at 500 rpm to obtain a precursor solution;

[0045] Step 2: Preparation of Recrystallization Solution

[0046] At room temperature, toluene is mixed with an equal volume of the precursor solution, and a magnetic stirring reaction is carried out at a rotating speed of 1000 rpm to obtain a recrystallization solution;

[0047] Step 3: Preparation of Br-vacancy-rich CsPbBr 3 Quantum dot solution

[0048] Inject 100 ul of recrystallization solution into 5 ml of toluene immersed in ice-water mixture, and perform magnetic stirring reaction at 0 degrees Celsius and 1000 rpm for 60 minutes to form CsPbBr rich in Br vacancies 3 quantum dot solution;

[0049] Step 4: Tuning t...

no. 2 example

[0052] Step 1: Prepare the Precursor Solution

[0053] At room temperature, 0.5 mmol of lead bromide, 0.5 mmol of cesium bromide, 1 ml of oleic acid and 0.5 ml of oleylamine were added to 10 ml of dimethylformamide solvent to carry out magnetic stirring reaction at 500 rpm to obtain a precursor solution;

[0054] Step 2: Preparation of Recrystallization Solution

[0055] At room temperature, toluene is mixed with an equal volume of the precursor solution, and a magnetic stirring reaction is carried out at a rotating speed of 1000 rpm to obtain a recrystallization solution;

[0056] Step 3: Preparation of Br-vacancy-rich CsPbBr 3 Quantum dot solution

[0057] Inject 100 ul of recrystallization solution into 5 ml of toluene immersed in ice-water mixture, and perform magnetic stirring reaction at 0 degrees Celsius and 1000 rpm for 60 minutes to form CsPbBr rich in Br vacancies 3 quantum dot solution;

[0058] Step 4: Tuning the Quantum Dot Wavelength

[0059] Quickly add 100...

no. 3 example

[0061] Step 1: Prepare the Precursor Solution

[0062] At room temperature, 0.5 mmol of lead bromide, 0.5 mmol of cesium bromide, 1 ml of oleic acid and 0.5 ml of oleylamine were added to 10 ml of dimethylformamide solvent to carry out magnetic stirring reaction at 500 rpm to obtain a precursor solution;

[0063] Step 2: Preparation of Recrystallization Solution

[0064] At room temperature, toluene is mixed with an equal volume of the precursor solution, and a magnetic stirring reaction is carried out at a rotating speed of 1000 rpm to obtain a recrystallization solution;

[0065] Step 3: Preparation of Br-vacancy-rich CsPbBr 3 Quantum dot solution

[0066] Inject 100 ul of recrystallization solution into 5 ml of toluene immersed in ice-water mixture, and perform magnetic stirring reaction at 0 degrees Celsius and 1000 rpm for 60 minutes to form CsPbBr rich in Br vacancies 3 quantum dot solution;

[0067] Step 4: Tuning the Quantum Dot Wavelength

[0068] Quickly add 200...

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Abstract

The invention provides a self-assembly wavelength tuning method of perovskite quantum dots. The preparation method comprises the following steps: S1, preparing a precursor solution, namely adding lead bromide, cesium bromide, oleic acid and oleylamine into a dimethylformamide solvent at room temperature, and carrying out magnetic stirring reaction to prepare the precursor solution; s2, preparing a recrystallization solution: mixing toluene with the precursor solution at room temperature, and carrying out magnetic stirring reaction to prepare the recrystallization solution; s3, preparing a CsPbBr3 quantum dot solution rich in Br vacancies: injecting the recrystallization solution into toluene immersed in an ice-water mixture, and forming the CsPbBr3 quantum dot solution rich in Br vacancies through magnetic stirring reaction; and S4, tuning the wavelength of the perovskite quantum dot: adding tetrahydrofuran into the CsPbBr3 quantum dot solution rich in Br vacancy, and carrying out a magnetic stirring reaction to obtain a self-assembled wavelength-tuned perovskite quantum dot solution.

Description

technical field [0001] The invention relates to the field of preparation of inorganic nanomaterials, in particular to a method for self-assembling wavelength tuning of perovskite quantum dots. Background technique [0002] All-inorganic CsPbX3 nanocrystals possess exotic electronic structures, which endow them with properties such as high defect tolerance, long photogenerated carrier lifetime, and size-dependent emission wavelengths. These properties enable single nanocrystals to emit high-purity single photons to achieve collective quantum phenomena that are difficult to achieve in other semiconductor nanocrystals, and are widely used in photodetectors, light-emitting diodes, solar cells, and lasers. [0003] Self-assembled CsPbBr 3 Nanocrystals have attracted widespread attention due to their collective optical, electronic, and quantum properties, such as electronic coupling and microstrip formation, superfluorescence, and low-threshold two-photon-induced optical gain. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y30/00B82Y20/00
CPCC09K11/665B82Y20/00B82Y30/00Y02E10/549
Inventor 胡以华陈友龙马良石亮董骁赵楠翔侯阿慧王新宇
Owner NAT UNIV OF DEFENSE TECH