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Preparation method and application of mixed halogen perovskite quantum dots

A technology of perovskite and quantum dots, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., to achieve the effect of simple preparation method and good reproducibility

Pending Publication Date: 2022-05-24
MINDU INNOVATION LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a preparation method and application of mixed halogen perovskite quantum dots to solve the problem of pure blue light and pure red light mixed halogen perovskite quantum dots under electrical excitation and light excitation. The bottleneck problem of anion phase separation, the preparation method has the characteristics of simple and fast preparation process, wide source of raw materials and good stability of quantum dots, and is suitable for industrial scale preparation. It is used in wide color gamut LED backlight display, flexible display, Micro -LED full-color display has a broad market application prospect

Method used

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  • Preparation method and application of mixed halogen perovskite quantum dots

Examples

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Embodiment 1

[0035] Example 1 Mixed halogen CsPb (ClBr) 3 quantum dots

[0036] Step 1. 55.6mg PbCl 2 and 73.4mg PbBr 2 The lead halide was added to 500 μL of dimethyl sulfoxide and sonicated until the salt was completely dissolved, resulting in clear solution A.

[0037] Step 2. Mix 500 μL of glutaric acid, 500 μL of 3,3-diphenylpropylamine, 500 μL of water and 65 mg of cesium carbonate simultaneously into 50 mL of isopropanol, and then continue to stir the resulting mixture until all the cesium salts are dissolved to obtain a clear solution B.

[0038] Step 3. Under continuous stirring at room temperature, drop the clear solution A of step (1) into the clear solution B of step (2), the product is separated out from the solution, continue stirring at 800r / min for 2min, and then centrifuge the obtained product, Then add isopropanol to wash twice, redispersed in toluene solvent, and finally obtained mixed halogen CsPb(ClBr) 3 Quantum dots (dispersion concentration of quantum dots 2 mg / ...

Embodiment 2

[0039] Example 2 Mixed halogen CsPb (ClBr)3 quantum dots

[0040] Step 1. 62.9mg HPbCl 3 and 89.58mg HPbBr 3 The lead halide was added to 500 μL of N,N-dimethylformamide and sonicated until the salt was completely dissolved to obtain a clear solution A.

[0041] Step 2. Mix 500 μL of adipic acid, 500 μL of 3,3-diphenylpropylamine, 300 μL of water and 65 mg of cesium carbonate into 50 mL of isopropanol at the same time, and then continue to stir the resulting mixture until all the cesium salts are dissolved to obtain a clear solution B.

[0042] Step 3. Under continuous stirring at room temperature, drop the clear solution A of step (1) into the clear solution B of step (2), the product is separated out from the solution, continue stirring at 800r / min for 2min, and then centrifuge the obtained product, Then add isopropanol to wash twice, redispersed in toluene solvent, and finally obtained mixed halogen CsPb(ClBr) 3 Quantum dots (dispersion concentration of quantum dots 2 m...

Embodiment 3

[0043] Example 3 Mixed halogen CsPb (ClBr) 3 quantum dots

[0044] Step 1. 62.9mg HPbCl 3 and 110mg PbBr 2 The lead halide was added to 500 μL of N,N-dimethylformamide and sonicated until the salt was completely dissolved to obtain a clear solution A.

[0045] Step 2. 500 μL of bis(2.4.4-trimethylpentyl)phosphonic acid, 500 μL of 3,3-diphenylpropylamine, 400 μL of water and 65 mg of cesium carbonate were simultaneously added to 50 mL of isopropanol, and the resulting mixture was added Continue stirring until all the cesium salts are dissolved, and a clear solution B is obtained.

[0046] Step 3. Under continuous stirring at room temperature, drop the clear solution A of step (1) into the clear solution B of step (2), the product is separated out from the solution, continue stirring at 800r / min for 2min, and then centrifuge the obtained product, Then add isopropanol to wash twice, redispersed in toluene solvent, and finally obtained mixed halogen CsPb(ClBr) 3 Quantum dots ...

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Abstract

The invention discloses a preparation method and application of mixed halogen perovskite quantum dots. The main synthesis process comprises the following steps: adding lead halide in different proportions into a strong polar solvent solution, carrying out ultrasonic dissolution, and injecting into a weak / non-polar solvent containing a ligand and cesium salt to obtain the mixed halogen perovskite quantum dot. The process equipment is simple, no protective gas is needed, operation is easy, convenient and efficient, large-scale production can be achieved, and the obtained quantum dots are good in crystallinity, high in spectral stability and excellent in luminescent property. The method can be applied to the technical fields of wide-color-gamut LED backlight source display, flexible display, Micro-LED full-color display, solar cells, fluorescence sensing, light or photoelectrocatalysis, light detectors and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer optoelectronic materials, and in particular relates to a preparation method and application of mixed halogen perovskite quantum dots. Background technique [0002] With their low cost, high color saturation, high fluorescence quantum yield, tunable emission wavelength, and solution processing, cesium lead halide perovskite quantum dots are candidates for next-generation flat-panel displays and solid-state lighting. Benefiting from a deep understanding of the design of perovskite nanocrystalline materials, the optimization of device structures, and the luminescence mechanism, since the first observation of perovskite electroluminescence at room temperature in 2014, green and near-infrared perovskites have The external quantum efficiency of electroluminescent diodes has now exceeded 20%. However, blue and red LEDs, which are one of the three primary colors, have been facing problem...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y20/00B82Y40/00H01L33/50
CPCC09K11/665B82Y20/00B82Y40/00H01L33/502Y02E10/549
Inventor 朱浩淼陈德建
Owner MINDU INNOVATION LAB
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