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Single-size CsPbX3 perovskite nanocrystalline preparation method

A technology of perovskite and nanocrystals, which is applied in the field of synthesis of single-size CsPbX3 perovskite nanocrystals, can solve the problems of small size, uncontrollable, and unobtainable, and achieve easy-to-adjust product size, controllable components, Simple operation effect

Inactive Publication Date: 2016-04-27
JILIN UNIV
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  • 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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Embodiment 1

[0025] First, a cesium oleate solution is prepared. Mix 2 mmol (0.648 g) of cesium carbonate powder, 10 mmol (3.35 mL) of OA (oleic acid) and 6.65 mL of ODE (octadecene), heat to 150°C under nitrogen protection to dissolve cesium carbonate, and cool to 100 ℃, prepared into a 0.2M cesium oleate solution, a light yellow transparent solution.

[0026] Then take 0.2 mmol of lead bromide solid powder, 0.2 mL of oleylamine, 0.2 mL of oleic acid and 4 mL of dodecane into a three-necked flask, evacuated at 50°C for 30 minutes, filled with nitrogen for protection, and then heated to 150°C, After the lead bromide was dissolved, it was cooled to room temperature of 25 °C, and then 0.2 mL of 0.2 M cesium oleate in octadecene solution was injected to obtain single-size CsPbBr with an absorption peak at 402 nm. 3 Perovskite Nanocrystals. Its absorption spectrum is shown in figure 1 .

Embodiment 2

[0028] First, a cesium oleate solution is prepared. Mix 2 mmol (0.648 g) of cesium carbonate powder, 10 mmol (3.35 mL) of OA (oleic acid) and 6.65 mL of ODE (octadecene), heat to 150°C under nitrogen protection to dissolve cesium carbonate, and cool to 100 ℃, prepared into a 0.2M cesium oleate solution, a light yellow transparent solution.

[0029] Then take 0.2 mmol of lead bromide solid powder, 0.3 mL of oleylamine, 0.2 mL of oleic acid and 4 mL of dodecane into a three-necked flask, evacuated at 50°C for 30 minutes, filled with nitrogen for protection, and then heated to 150°C, After the lead bromide was dissolved, it was cooled to room temperature of 25 °C, and then 0.2 mL of 0.2 M cesium oleate in octadecene solution was injected to obtain single-size CsPbBr with an absorption peak at 420 nm. 3 Perovskite Nanocrystals. Its absorption spectrum is shown in figure 1 , and its electron microscope photos can be found in figure 2 .

Embodiment 3

[0031] First, a cesium oleate solution is prepared. Mix 2 mmol (0.648 g) of cesium carbonate powder, 10 mmol (3.35 mL) of OA (oleic acid) and 6.65 mL of ODE (octadecene), heat to 150°C under nitrogen protection to dissolve cesium carbonate, and cool to 100 ℃, prepared into a 0.2M cesium oleate solution, a light yellow transparent solution.

[0032]Then take 0.2 mmol of lead bromide solid powder, 0.4 mL of oleylamine, 0.2 mL of oleic acid and 4 mL of dodecane into a three-necked flask, vacuumize at 50°C for 30 minutes, fill with nitrogen for protection, and then heat up to 150°C, After the lead bromide was dissolved, it was cooled to room temperature of 25 °C, and then 0.2 mL of 0.2 M cesium oleate in octadecene solution was injected to obtain a single-size CsPbBr with an absorption peak at 435 nm. 3 Perovskite Nanocrystals. Its absorption spectrum is shown in figure 1 , and its electron microscope photos can be found in 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) Synthesis method of perovskite nanocrystals. Background technique [0002] After the semiconductor material is gradually reduced from the bulk phase to a certain critical size (1 to 20 nanometers), the volatility of its carriers becomes significant, and the movement will be limited, resulting in an increase in kinetic energy, and the corresponding electronic structure is continuous from the bulk phase. The energy level structure becomes a quasi-split discontinuity, a phenomenon known as the quantum size effect. The more common semiconductor nanoparticles or quantum dots mainly include II-VI, III-V and IV-VI groups. These types of quantum dots all obey the quantum size effect, and their properties change regularly with size, such as absorption and emission wavelengths that change with size. Therefore, semiconducto...

Claims

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Application Information

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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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