A kind of copper-doped ternary metal halide and preparation method thereof

A ternary metal, halide technology, applied in chemical instruments and methods, silver compounds, silver compounds, etc., can solve the problem of no fluorescence properties, 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

The applicant's research group tried to fully perform the ball milling reaction on the raw materials under normal temperature and pressure, and also prepared a pure phase Rb 2 AgI 3 , but the tested product has no fluorescent properties

Method used

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  • A kind of copper-doped ternary metal halide and preparation method thereof
  • A kind of copper-doped ternary metal halide and preparation method thereof
  • A kind of copper-doped ternary metal halide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 2mmol rubidium iodide, 1mmol silver iodide, and 0.4mmol cuprous iodide in the glove box, pour them into a 25mL agate jar containing 25 agate balls with a diameter of 6mm, and take 30 microliters of H 3 PO 2 Put it into the grinding tank together with the reactants, set the AC frequency of the ball mill to 35Hz, and at this time the corresponding speed is 1050rad / min, mechanically grind for 15h, and the light yellow-green mixture powder changes from fluffy to dense with the prolongation of the grinding time, and finally becomes It becomes a fluffy white powder. After grinding, it is irradiated with an ultraviolet lamp with an excitation wavelength of 302nm. The product emits blue fluorescence. The product is further purified with ethanol, dried under vacuum at 45°C, and finally cooled at -10°C. After 1.5h, high-purity, bright blue fluorescent Rb was obtained 2 AgI 3 : Cu inorganic compound.

[0020] The product was tested for solid-state fluorescence excitation ...

Embodiment 2

[0022] In Example 1, due to Cu + Instability, disproportionation reaction easily occurs in acidic solution to form Cu 2+ And Cu, have an adverse effect on the fluorescence quantum yield of the product, so hypophosphorous acid must be added. The amount of hypophosphorous acid was changed from 30uL in Example 1 to 10uL, 20uL, and 50uL respectively, and other conditions and steps were unchanged. The fluorescence efficiency of each product was measured to be 49.1%, 49.8%, and 41.2%, respectively, so the amount of hypophosphorous acid was 30uL best.

Embodiment 3

[0024] In Example 1, the grinding time was too short to fully react the raw materials, and the pure phase of Rb could not be obtained. 2 AgI 3 , too long grinding time will cause Cs 3 CuI 5 The generation of impurity, so the grinding time must be appropriate. Change the grinding time from 15h to 2h, 10h, and 30h in Example 1, and find that grinding for 15h is pure phase Rb 2 AgI 3 : Cu, too short or too long grinding time will lead to the generation of impurity phases, the optimal grinding time is 15h.

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Abstract

A copper-doped ternary metal halide and a preparation method of the invention belong to the technical field of perovskite crystal material preparation. The copper-doped ternary metal halide is Cu-doped Rb 2 AgI 3 Perovskite fluorescent materials. The preparation method includes: first mixing rubidium iodide, silver iodide and cuprous iodide and adding hypophosphorous acid dropwise, ball milling in a ball mill at 35 Hz for 15 hours, cleaning with ethanol, drying in vacuum, and finally cooling at -5°C to -20°C, Obtaining copper-doped ternary metal halide Rb with high purity and enhanced fluorescence efficiency 2 AgI 3 : Cu, the sample emits bright blue fluorescence under the excitation of a 302nm ultraviolet lamp, and has the advantages of non-toxicity, high quantum efficiency and high air stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of perovskite crystal materials, in particular to a method for significantly improving Rb by doping 2 AgI 3 Synthetic methods for quantum efficiency. Background technique [0002] Renewable energy needs to be vigorously developed to deal with climate change, and its molecular formula is ABX 3 A newly discovered halide perovskite is one of the most promising materials for a new generation of solar cells so far, and its energy conversion efficiency is comparable to that of existing solar cell materials, such as silicon solar cells and cadmium telluride thin-film cells. . With the continuous improvement of the stability of halide solar cells, its stability will soon meet the requirements of the market, but its lead toxicity is still the most concerned issue. So far, all perovskite solar cells with better performance contain lead elements. Laws, regulations and common sense indicate that perov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G5/00C09K11/61
CPCC01G5/006C09K11/616C01P2002/34
Inventor 解仁国姚佳利张资序
Owner JILIN UNIV
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