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Synthesis method of halide perovskite type nanocrystal quantum dots

A halide perovskite and nanocrystal technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problem of unstable lead halide quantum dots, achieve the suppression of electron and hole recombination, high quantum Yield, effect of quantum dot stabilization

Pending Publication Date: 2021-11-23
张家松 +3
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  • Description
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  • Application Information

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Problems solved by technology

[0006] However, in the thermal injection method, the formed lead halide quantum dots are not stable in air

Method used

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  • Synthesis method of halide perovskite type nanocrystal quantum dots
  • Synthesis method of halide perovskite type nanocrystal quantum dots
  • Synthesis method of halide perovskite type nanocrystal quantum dots

Examples

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no. 1 example

[0034] The main steps in the synthesis of halide perovskite quantum dots are:

[0035] lead halide such as PbI 2 , PbBr 2 and PbCl 2 Add it into the solution of tri-n-octylphosphine, and prepare the precursor powder by dissolving. That is, lead halide powder is dissolved in a solution of tri-n-octylphosphine heated to 60-80°C. PB 2 161 g of the powder was used as lead halide. dissolved in PbI 2 The tri-n-octylphosphine solution of 161g powder is called "lead halide-tri-n-octylphosphine solution".

[0036] Cesium oleate was melted in octadecene solution of oleic acid and oleylamine to obtain cesium oleate solution. Cesium oleate solution is prepared in advance.

[0037] The cesium oleate solution was heated by a heater and heated under nitrogen (N 2) atmosphere into the lead halide-tri-n-octylphosphine solution. Magnetic stirring and temperature control, the reaction time between the cesium oleate solution and the lead halide-tri-n-octylphosphine solution is 2-6 secon...

no. 2 example

[0049] As mentioned above, the present invention is general formula CsMX for quantum dot 3 Among the halide perovskite-type quantum dots represented, M is selected from Pb, Sn, Ge or their compounds, and M can also be any combination of Pb, Sn, Ge or their compounds. This example describes a mixed product A method for the generation of halide perovskite-type quantum dots.

[0050] Mixed product, in this example refers to CsSnI-xPbxI 3 Quantum dots are formed by the general formula CsMX 3 Represented halide perovskite quantum dots. SnI 2 and PbI 2 The mixed powder 162 g of the precursor is dissolved in a solution of an organophosphorus compound such as tri-n-octylphosphine. 162 g of the mixed powder was dissolved in a tri-n-octylphosphine solution heated to 60-80°C. The tri-n-octylphosphine solution in which 162 g of the halide mixed powder is dissolved is referred to as "(SnI 2 +PbI 2 )-tri-n-octylphosphine solution".

[0051] Cesium oleate is melted in a solution of ...

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Abstract

The invention discloses a synthesis method of halide perovskite type nanocrystal quantum dots. The quantum dots produced by the method are halide perovskite type quantum dots represented by a general formula CsMX3, wherein M is selected from Pb, Sn, Ge or a compound thereof, X is I, Br, Cl or a compound thereof, and the surface of the quantum dots is stabilized by a ligand of tri-n-octylphosphine. The method for manufacturing the quantum dots comprises the steps: dissolving halogenated metal powder of Pb, Sn, Ge or other compounds in tri-n-octylphosphine to prepare a solution, heating a cesium oleate solution to a given temperature, injecting the injection solution into the heated cesium oleate solution in a nitrogen atmosphere, and then synthesizing the lead halide perovskite type quantum dots through reaction for a preset time. The synthesis method is simple, and the quantum dots have a stable surface structure and high luminous efficiency.

Description

technical field [0001] The invention belongs to the technical field of backscattering communication, and in particular relates to a method for synthesizing halide perovskite nano crystal quantum dots. Background technique [0002] Halide perovskite crystals have attracted much attention as nanocrystalline structures with high conversion efficiency. Optical devices using halide perovskite crystals can be fabricated by solution coating, and the fabrication cost can be reduced. To date, highly luminescent CsPbX has been synthesized by thermal injection 3 For quantum dots, X is a halogen element including chlorine (Cl), bromine (Br) and iodine (I). [0003] Currently, for highly luminescent CsPbX 3 The production method of quantum dots is mainly thermal injection. [0004] The hot injection method is to lead iodide (PbI 2 ) The powder is put into the solution of oleic acid and oleylamine, and the octadecene solution A in which it is dissolved is heated to a predetermined te...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00
Inventor 张家松王良辉马明杨登科
Owner 张家松
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