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Method for synthesizing caesium-lead-halide Cs4PbX6 nanocrystals

A synthesis method and nanocrystal technology are applied in the synthesis field of Cs4PbX6 nanocrystals, which can solve the problems of harsh synthesis conditions of nanocrystals, prone to impurity phase, low yield and the like, and achieve easy functional application, high yield and simple operation. Effect

Inactive Publication Date: 2018-06-01
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at current Cs 4 wxya 6 The synthesis conditions of nanocrystals are harsh, the yield is low, and the impurity phase is easy to appear. A cesium lead halide Cs 4 wxya 6 Synthesis of Nanocrystals

Method used

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  • Method for synthesizing caesium-lead-halide Cs4PbX6 nanocrystals
  • Method for synthesizing caesium-lead-halide Cs4PbX6 nanocrystals
  • Method for synthesizing caesium-lead-halide Cs4PbX6 nanocrystals

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Step 1, take by weighing 4.0mmol cesium carbonate (Cs 2 CO 3 ) into a round-bottomed flask containing 5.0 mL of oleic acid and 20 mL of octadecene, stirred at 120°C for 30 min to completely dissolve cesium carbonate, and cooled to room temperature using an ice-water bath to form a cesium precursor solution.

[0040] Step 2, take by weighing 2.0mmol lead bromide (PbBr 2 ) into a round-bottomed flask containing 2.0mL oleylamine, 2.0mL oleic acid and 20mL octadecene, stirred at 120°C for 30min to completely dissolve lead bromide, and cooled to room temperature using an ice-water bath to form a lead bromide precursor solution .

[0041] Step 3. Measure 4.0 mL of the cesium precursor solution obtained in step 1 and 8 mL of the lead bromide precursor solution obtained in step 2 to mix the two, and sonicate at room temperature for 5 min.

[0042] Step 4. Transfer the mixed solution obtained in step 3 into a reaction kettle, heat at a heating temperature of 100° C. for 30 mi...

Embodiment 2

[0047] Change 8mL of the lead bromide precursor solution in step 3 in Example 1 to 10mL, and other operations are the same as in Example 1, and the prepared Cs 4 PbBr 6 The scanning electron microscope image of the nanocrystal Figure 5 , Cs 4 PbBr 6 The average size of nanocrystals is 18nm.

Embodiment 3

[0049] Change lead bromide in step 2 and step 3 in embodiment 1 to lead iodide, and other operations are all the same as in embodiment 1, and the obtained Cs 4 PB 6 Nanocrystalline UV-Vis absorption spectrum see Image 6 , the UV-vis characteristic absorption peak is 370nm;

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Abstract

The invention relates to a method for synthesizing caesium-lead-halide Cs4PbX6 nanocrystals. The method comprises adding a precursor solution of caesium into a precursor solution of lead halide at theroom temperature, carrying out ultrasonic mixing to obtain a uniform mixed solution, transferring the mixed solution C into a reactor, carrying out a reaction process at 80-150 DEG C for 30-200min, carrying out natural cooling to obtain a reaction product, carrying out centrifugation, and washing and drying the products to obtain final product Cs4PbX6 nanocrystals. The method is easy to operate and is free of harsh operating conditions. The Cs4PbX6 nanocrystals have the characteristics of strong controllability, uniform morphology, high purity and high yield.

Description

technical field [0001] The present invention relates to a kind of Cs 4 wxya 6 (X=Cl, Br, I) a synthetic method for nanocrystals, specifically a Cs with high purity and high yield 4 wxya 6 The invention relates to a method for synthesizing nanocrystals, belonging to the fields of nanometer material technology and new material preparation. Background technique [0002] All-inorganic cesium lead halide perovskite nanocrystals have attracted widespread attention due to their excellent optoelectronic properties and solution processability, and have important applications in the fields of photovoltaics and display lighting. However, the current research on cesium lead halide perovskite nanocrystals mainly focuses on the cubic or orthorhombic cesium lead halide perovskite CsPbX. 3 (X=Cl, Br, I), and for its derivative CsPb 2 x 5 and Cs 4 wxya 6 Nanocrystals are less studied. Numerous studies have shown that such derivatives can not only compare with CsPbX in terms of photo...

Claims

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Application Information

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IPC IPC(8): C01G21/00B82Y40/00
CPCC01G21/006B82Y40/00C01P2002/72C01P2002/84C01P2004/03C01P2004/04C01P2004/64C01P2006/80
Inventor 林靖翟伟黄阳李巧灵唐成春
Owner HEBEI UNIV OF TECH
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