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Method for efficient synthesis of Cs2AgBr3 non-lead all-inorganic perovskite

A technology of inorganic calcium and titanium ore, applied in inorganic chemistry, chemical instruments and methods, silver compounds, etc., can solve the problems of unavailability, long reaction time and cooling time, resistance to Cs, etc., and achieves simple operation and is suitable for large-scale production. , the effect of short time

Inactive Publication Date: 2020-03-06
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still many shortcomings and deficiencies in this method, the reaction time and cooling time are too long, the production cycle is long, and the reaction requires high temperature conditions, and the energy consumption is large.
The most important point is that pure phase Cs cannot be obtained at any temperature by this method 2 AgBr 3 , cesium bromide is always present in the product, so that the pure phase of Cs 2 AgBr 3 Subsequent treatment processes are also required, which not only reduces the utilization rate of raw materials, but also complicates the production process
This series of shortcomings seriously hinders Cs 2 AgBr 3 Preparation and industrial production

Method used

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  • Method for efficient synthesis of Cs2AgBr3 non-lead all-inorganic perovskite
  • Method for efficient synthesis of Cs2AgBr3 non-lead all-inorganic perovskite
  • Method for efficient synthesis of Cs2AgBr3 non-lead all-inorganic perovskite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 2mmol cesium bromide, 1mmol silver bromide, 60ul tri-n-octyl phosphorus, and 25 agate balls with a diameter of 6mm into a 25ml agate jar. Grinding for 2 hours, the mixture gradually hardened from a fluffy light yellow powder and adhered to the wall of the agate jar. It was irradiated with a 302nm ultraviolet lamp, and it was found that the fluorescence brightness of the product did not continue to increase. The product was heat-treated in a vacuum oven at 150°C for 2 hours. The white Cs obtained after heat treatment 2 AgBr 3 The product was frozen at -30°C for 2 hours, and the product was subjected to solid absorption analysis and fluorescence testing. The absorption spectrum was as follows: figure 1 As shown, the emission spectrum is shown as figure 2 As shown, the fluorescence efficiency is 40.3%, and the XRD pattern of the product is as follows image 3 shown by image 3 It can be seen that the Cs prepared according to the method of Example 1 2 AgBr 3 is p...

Embodiment 2

[0019] Embodiment 2: The consumption of the tri-n-octylphosphine in the example 1 is changed to 30uL, 50uL, 80uL, 100uL respectively by 60uL, other conditions are unchanged, the fluorescence quantum efficiency of the product is respectively 25.6%, 36.7%, 33.9%, 33.4%, so the optimal dosage of tri-n-octylphosphine is 60uL.

Embodiment 3

[0020] Embodiment 3: The temperature of the heat treatment in the vacuum oven in Example 1 was changed from 150°C to 80°C, 100°C, 200°C, and 300°C, and the fluorescent quantum efficiencies of the products were 30.2%, 36.2%, 34.1%, and 33.7%, respectively, Therefore, the optimal heat treatment temperature is 150°C.

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Abstract

Belonging to the technical field of preparation of semiconductor nanomaterials, the invention discloses a method for efficient synthesis of Cs2AgBr3 non-lead all-inorganic perovskite. The method includes: firstly mixing cesium bromide and silver bromide according to a molar ratio of 2:1, then adding tri-n-octyl phosphorus, performing grinding, gradually hardening the mixture from fluffy faint yellow powder, and attaching the mixture to the wall of a container, gradually turning the faint yellow powder to white powder along with the grinding, performing monitoring by a 302nm ultraviolet lamp inthe grinding process, and stopping the action when the brightness of the product does not increase any more; and subjecting the obtained product to heat treatment in a vacuum oven at 80-300DEG C for3h, and then conducting freezing treatment at a temperature ranging from -10DEG C to -50DEG C for 1h-3h, thus obtaining the Cs2AgBr3 non-lead all-inorganic perovskite with improved fluorescence yield.The method provided by the invention has the advantages of short time, easy operation and suitability for large-scale production.

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 perovskite Cs 2 AgBr 3 method of preparation. Background technique [0002] Lead halide perovskites have attracted extensive research interest in the field of luminescence due to their good defect tolerance. Lead halide perovskites have emerged as the most promising optoelectronic materials, and various optoelectronic devices based on lead halide perovskite designs have been successfully realized due to their unique properties, such as high absorption coefficient, long carrier diffusion length, and low processing cost. , including solar cells, light-emitting diodes and lasers, and ultraviolet photodetectors. Despite these excellent properties of lead halide perovskites, the high toxicity and inherent instability of lead are two major concerns of lead halide perovskites. On the premise of ensu...

Claims

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Application Information

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