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Method for improving fluorescence efficiency of zero-dimensional perovskite material

A perovskite material and fluorescence technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of affecting spectral analysis, limiting applications, and long time consumption, and achieve the effect of improving fluorescence efficiency

Active Publication Date: 2022-02-11
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 1960, CK et al prepared Cs for the first time by high-temperature solid-state melting method 4 PbCl 6 This substance consumes a lot of energy and takes a long time, which is not conducive to large-scale industrial production, and the synthesis process of this substance is often accompanied by three-dimensional CsPbCl 3 The coexistence of impurities, which will seriously affect the spectral analysis and draw unreliable conclusions
However, in addition to the green-emitting Cs of disputed origin 4 PbBr 6 Outside, Cs 4 wxya 6 Perovskites do not emit light in the visible region, which greatly limits their application as optoelectronic materials in the visible region

Method used

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  • Method for improving fluorescence efficiency of zero-dimensional perovskite material
  • Method for improving fluorescence efficiency of zero-dimensional perovskite material
  • Method for improving fluorescence efficiency of zero-dimensional perovskite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 4mmol cesium chloride and 1mmol lead chloride in the glove box, pour them into a 25mL agate jar containing 25 agate balls with a diameter of 6mm, seal the agate jar with a sealing film, and take it out of the glove box , set the AC frequency of the ball mill to 40Hz, and mechanically grind for 5 hours. The white mixture powder will change from fluffy to dense with the prolongation of the grinding time, and finally turn into fluffy white powder. Stop grinding. At this time, irradiate with an ultraviolet lamp with an excitation wavelength of 302nm , the product is not fluorescent. Put the obtained product into a hydrothermal reaction kettle, add 0.2mol stannous chloride, 150 microliters of hypophosphorous acid, 5 milliliters of hydrochloric acid, 0.1mmol of sodium citrate, maintain at 180°C for 600min to ensure that the precursor is completely dissolved, pass 10°C / h Slowly cool down to room temperature. After annealing at room temperature, the obtained crystals we...

Embodiment 2

[0024] In Example 1, since Sn 2+ Instability, it is very easy to generate oxidation reaction to form Sn in high temperature acidic solution 4+ , has an adverse effect on the fluorescence quantum yield of the product, so hypophosphorous acid must be added. Now change the amount of hypophosphorous acid from 150 μL in Example 1 to 100 μL, 200 μL, and 300 μL, and keep other conditions and steps unchanged. 150 μL is optimal.

Embodiment 3

[0026] The amount of hydrochloric acid in Example 1 was changed from 5mL to 3mL, 4mL, and 6mL respectively, and other conditions and steps were unchanged. The fluorescence efficiencies of each product were measured to be 79.6%, 71.4%, and 78.3%, respectively, so the amount of hydrochloric acid was 5mL. excellent.

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Abstract

The invention discloses a method for improving the fluorescence efficiency of a zero-dimensional perovskite material, and belongs to the technical field of perovskite crystal material preparation. The preparation method comprises the steps of mixing and ball-milling cesium chloride and lead chloride, adding 0.2 mol of stannous chloride, hydrochloric acid, hypophosphorous acid and sodium citrate, heating a tubular furnace to 150-230 DEG C, maintaining for 600 minutes, slowly cooling to room temperature, carrying out suction filtration, immersing crystals into an ethanol solution of polyvinyl alcohol, taking out, drying overnight, cooling and the like. The invention provides a method for remarkably improving the fluorescence efficiency through doping for the first time, the prepared material is a zero-dimensional luminescent material with high quantum efficiency and environmental stability, and a good prospect is provided for application in the photoelectric aspect.

Description

technical field [0001] The invention belongs to the technical field of preparation of perovskite crystal materials, in particular to a method for significantly increasing Cs by doping Sn 4 PbCl 6 Fluorescence efficiency, synthetic Cs 4 PbCl 6 method for bright green fluorescent materials. Background technique [0002] All-inorganic lead-based three-dimensional (3D) perovskite CsPbX 3 (X=Cl, Br, I) nanocrystals have many advantages, such as easy synthesis, narrow emission spectrum, luminescence that can cover the entire visible light region, high fluorescence quantum yield, etc. These advantages make all-inorganic lead-based perovskite materials in lighting , solar cells and light-emitting diode lights have shown broad application prospects. [0003] Zero-dimensional (0D) metal halides in low-dimensional metal halide materials have also become a research hotspot in recent years. In the 0D structure, the inorganic metal halide unit is surrounded by Cs + Surrounded by io...

Claims

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Application Information

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IPC IPC(8): C09K11/66
CPCC09K11/665
Inventor 解仁国姚佳利汪大洋杨文胜
Owner JILIN UNIV
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