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Method for simply and efficiently synthesizing CsAgBr2 perovskite

A perovskite, high-efficiency technology, applied in chemical instruments and methods, silver compounds, silver compounds, etc., can solve the problems of complicated operation, long production cycle, high energy consumption, etc., and achieves simple methods, easy industrial production, and simple operation Effect

Inactive Publication Date: 2020-02-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to be completed under high temperature conditions, which consumes a lot of energy, and the cooling process takes a long time, the production cycle is long, the operation is complicated, and it is not suitable for large-scale production.
The above disadvantages greatly hinder the CsAgBr 2 industrial production process
[0004] In summary, existing synthetic CsAgBr 2 method has certain disadvantages and limitations

Method used

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  • Method for simply and efficiently synthesizing CsAgBr2 perovskite
  • Method for simply and efficiently synthesizing CsAgBr2 perovskite
  • Method for simply and efficiently synthesizing CsAgBr2 perovskite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 1mmol of cesium bromide and 1mmol of silver bromide, then add 60uL tri-n-butyl phosphine, put 25 agate balls with a diameter of 6mm into a 25ml agate jar, adjust the alternating current frequency of the ball mill to 35Hz, and the rotating speed is 1050rad / min, mechanically milled for 3 hours, the mixture gradually hardened from fluffy pale yellow powder and adhered to the wall of the agate jar. It was irradiated with a 254nm ultraviolet lamp, and it was found that the fluorescence brightness of the product no longer continued to increase. Add 1 mL of deionized water to the ball milling jar and continue ball milling for 1 hour. The resulting product was washed 3 times with ethanol to remove unreacted cesium bromide and silver bromide, and dried in a vacuum oven at 180°C for 3 hours. The product was subjected to solid absorption analysis and fluorescence emission testing, figure 1 , figure 2 are their absorption and emission spectra, respectively. The fluorescenc...

Embodiment 2

[0019] Example 2: The amount of tri-n-butylphosphine in Example 1 was changed from 60uL to 30uL, 80uL, and 100uL, respectively. Other conditions and steps were unchanged. %, so the optimum amount of tri-n-butylphosphine is 60uL.

Embodiment 3

[0021] The temperature of the heat treatment in Example 1 was changed from 180°C to 60°C, 120°C, 250°C, and 350°C, respectively, and the fluorescence quantum efficiencies of the products treated at different temperatures were 18.3.%, 20.9%, 22.3%, and 23.2%, respectively. %. Therefore, the optimum heat treatment temperature is 180°C.

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Abstract

The invention relates to a method for efficiently synthesizing CsAgBr2 perovskite. Firstly, cesium bromide and silver bromide are mixed according to the molar ratio of 1: 1, then tri-n-butylphosphineis added for grinding, the mixture is gradually hardened from fluffy faint yellow powder and attached to the wall of a container and gradually becomes grey white powder along with grinding, a 254 nm ultraviolet lamp is used for monitoring, grinding is stopped when the brightness of a product is not increased any more, and the cesium bromide-silver bromide composite material is obtained. Deionizedwater is added into a grinding tank, grinding is continued, the obtained product is washed by ethanol, and heat treatment is carried out for 3 hours under the vacuum condition at 60-350 DEG C to obtain the pure phase CsAgBr2 perovskite. According to the method, the pure-phase CsAgBr2 is prepared through mechanical grinding for the first time, and meanwhile, the method has the advantages that the operation is simple, the method is simple, industrial production is easy to realize, and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, in particular to a high-efficiency, high-purity all-inorganic non-lead CsAgBr 2 Preparation method of perovskite. Background technique [0002] Metal halide perovskites are usually easily prepared in solution phase, and their fluorescence spectra can cover the entire visible light region. In recent years, all-inorganic perovskite nanocrystals have attracted much attention due to their excellent optoelectronic properties and potential materials for light-emitting devices. The quantum fluorescence efficiency (PLQY) of lead halide perovskites has been reported to be close to 100%. However, the application of traditional lead halide perovskites is limited due to the highly toxic heavy metal Pb and its instability. Therefore, replacing lead with low-toxic or non-toxic elements has become an effective solution and has been widely used. Research. At present, it has bee...

Claims

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Application Information

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IPC IPC(8): C01G5/00C09K11/61
CPCC01G5/006C01P2002/72C01P2002/84C09K11/616
Inventor 解仁国张资序汪大洋杨文胜
Owner JILIN UNIV