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A single size cspbx 3 Preparation method of perovskite nanocrystal

A perovskite and nanocrystal technology, applied in the field of synthesis of single-size CsPbX3 perovskite nanocrystals, can solve problems such as uncontrollable, small size, and inability to obtain, and achieve controllable components, easy adjustment of product size, Simple operation effect

Inactive Publication Date: 2017-06-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the perovskite nanocrystals prepared by this method cannot obtain a smaller size due to the high-temperature hot injection method, and the high temperature is more uncontrollable for the reaction. Therefore, the lead-halide cesium calcium synthesized by this method Titanium ore nanocrystals have a certain size distribution
When the size of the nanocrystal is not very uniform, it will show a broadening of its absorption and emission spectrum, and its absorption and emission half-peak width will increase, that is to say, the emitted fluorescence is not very pure. , which will limit the application of pure inorganic perovskite nanocrystals in display and imaging
[0004] In summary, the existing inorganic perovskite nanocrystals have certain limitations, there are unresolved problems and defects, and the technology needs to be innovated and improved.

Method used

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  • A single size cspbx <sub>3</sub> Preparation method of perovskite nanocrystal
  • A single size cspbx <sub>3</sub> Preparation method of perovskite nanocrystal
  • A single size cspbx <sub>3</sub> Preparation method of perovskite nanocrystal

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Embodiment 1

[0026] First, a cesium oleate solution is prepared. Take 2mmol (0.648g) of cesium carbonate powder, 10mmol (3.35mL) of OA (oleic acid) and 6.65mL of ODE (octadecene) and mix them, heat to 150°C under nitrogen protection to dissolve cesium carbonate, cool to 100 ℃, prepared into 0.2M cesium oleate solution, which was light yellow transparent solution.

[0027] Then take 0.2mmol of lead bromide solid powder, 0.2mL of oleylamine, 0.2mL of oleic acid and 4mL of dodecane into a three-necked bottle, vacuumize at 50°C for 30 minutes, fill with nitrogen protection, and then heat up to 150°C. After the lead bromide is dissolved, cool down to room temperature at 25°C, and then inject 0.2mL of 0.2M cesium oleate in octadecene solution, and react to obtain a single-size CsPbBr with an absorption peak at 402nm 3 Perovskite nanocrystals. Its absorption spectrum is shown in figure 1 .

Embodiment 2

[0029] First, a cesium oleate solution is prepared. Take 2mmol (0.648g) of cesium carbonate powder, 10mmol (3.35mL) of OA (oleic acid) and 6.65mL of ODE (octadecene) and mix them, heat to 150°C under nitrogen protection to dissolve cesium carbonate, cool to 100 ℃, prepared into 0.2M cesium oleate solution, which was light yellow transparent solution.

[0030] Then take 0.2mmol of lead bromide solid powder, 0.3mL of oleylamine, 0.2mL of oleic acid and 4mL of dodecane into the three-neck flask, vacuumize at 50°C for 30 minutes, fill with nitrogen protection, and then heat up to 150°C. After the lead bromide is dissolved, cool down to room temperature at 25°C, and then inject 0.2mL of 0.2M cesium oleate in octadecene solution, and react to obtain a single-size CsPbBr with an absorption peak at 420nm 3 Perovskite nanocrystals. Its absorption spectrum is shown in figure 1 , see its electron micrograph figure 2 .

Embodiment 3

[0032] First, a cesium oleate solution is prepared. Take 2mmol (0.648g) of cesium carbonate powder, 10mmol (3.35mL) of OA (oleic acid) and 6.65mL of ODE (octadecene) and mix them, heat to 150°C under nitrogen protection to dissolve cesium carbonate, cool to 100 ℃, prepared into 0.2M cesium oleate solution, which was light yellow transparent solution.

[0033]Then take 0.2mmol of lead bromide solid powder, 0.4mL of oleylamine, 0.2mL of oleic acid and 4mL of dodecane into the three-necked bottle, vacuumize at 50°C for 30 minutes, fill with nitrogen protection, and then heat up to 150°C. After lead bromide is dissolved, cool down to room temperature at 25°C, and then inject 0.2mL of 0.2M cesium oleate in octadecene solution, and react to obtain a single-size CsPbBr with an absorption peak at 435nm 3 Perovskite nanocrystals. Its absorption spectrum is shown in figure 1 , see its electron micrograph image 3 .

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Abstract

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation and relates to a single-size CsPbX 3 (X=Cl, Br, I) Synthetic method of perovskite nanocrystals. Background technique [0002] After the semiconductor material is gradually reduced from the bulk phase to a certain critical size (1-20 nanometers), the volatility of the carriers becomes significant, and the movement will be limited, resulting in an increase in kinetic energy. The corresponding electronic structure is continuous from the bulk phase to The energy level structure becomes a quasi-split discontinuity, a phenomenon known as the quantum size effect. The more common semiconductor nanoparticles, that is, quantum dots, mainly include II-VI, III-V and IV-VI groups. These types of quantum dots are well obeyed by the quantum size effect, and their properties change regularly with the size, for example, the absorption and emission wavelengths change with the size. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/16B82Y40/00
CPCC01G21/003C01G21/16C01P2002/84C01P2004/04C01P2004/32C01P2004/64
Inventor 解仁国彭路成艾丽莎张颖杨文胜
Owner JILIN UNIV
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