A kind of high fluorescence efficiency inorganic non-lead perovskite material and preparation method

An inorganic non-perovskite technology, applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of lack of fluorescent properties, unfavorable industrial production, complicated operation, etc., and achieve the effect of improving fluorescence efficiency

Active Publication Date: 2021-09-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this double-layer perovskite will lead to an increase in the non-radiative recombination pathways of electrons and holes, which will reduce the fluorescence efficiency.
[0004] In 1949, the Clarabrink group prepared Cs for the first time. 2 AgI 3 This substance, due to the poor solubility of silver iodide, the synthesis needs to introduce potassium iodide under high temperature conditions, and prepare it into a concentrated solution to promote the dissolution of raw materials. This method cannot avoid the impact of excess KI on crystal purity.
In 2004, S. Hull's group also synthesized Cs by solid phase high temperature melting method. 2 AgI 3 , the method is complicated to operate, consumes a lot of energy, takes a long time, and is not conducive to large-scale industrial production
In 2020, Xie's group prepared lead-free and cadmium-free bimetallic Cs-Ag-X (X=Cl, Br, I) halides for the first time by ball milling, realizing a spectrum ranging from ultraviolet-visible to near-infrared (390 to 820nm) Wide range of tuning, the study found that in order to prepare bright yellow fluorescent Cs 2 AgI 3 A certain amount of silver acetate must be added as a photoinitiator, and Cs with fluorescent properties cannot be obtained simply by ball milling cesium iodide and silver iodide. 2 AgI 3

Method used

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  • A kind of high fluorescence efficiency inorganic non-lead perovskite material and preparation method
  • A kind of high fluorescence efficiency inorganic non-lead perovskite material and preparation method
  • A kind of high fluorescence efficiency inorganic non-lead perovskite material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Weigh 2mmol cesium iodide and 1mmol silver iodide 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, take it out of the glove box, set The AC frequency of the ball mill is 35Hz, and the corresponding rotational speed is 1050rad / min at this time. After mechanical grinding for 10 hours, the yellow-green mixture powder changes from fluffy to dense with the prolongation of the grinding time, and finally turns into a fluffy light yellow powder. Stop grinding. When irradiated with an ultraviolet lamp with an excitation wavelength of 302nm, the product has no fluorescence. Put the obtained product into a hydrothermal reaction kettle, add 0.2mol cuprous iodide, 30 microliters of hypophosphorous acid, and 2 milliliters of hydroiodic acid, maintain at 180°C for 5 hours, and cool down to room temperature through a 24h program. After annealing at room temperature, after cooling at -15 °C for 1....

Embodiment 2

[0026] In Example 1, due to Cu + Instability, it is very prone to disproportionation reaction to generate Cu 2+ and Cu, therefore hypophosphorous acid must be added, now the amount of hypophosphorous acid is changed from 30uL in Example 1 to 10uL, 20uL, 50uL respectively, other conditions and steps are unchanged, the fluorescence efficiency of each product is measured to be 59.4%, 62.8% respectively. %, 63.7%, so the optimal dosage of hypophosphorous acid is 30uL.

Embodiment 3

[0028] Change the hydroiodic acid consumption in embodiment 1 into 1mL, 1.5mL, 3mL respectively by 2mL, other conditions and steps are constant, record the fluorescence efficiency of each product to be respectively 50.4%, 54.6%, 47.1%, therefore hydroiodide The optimal acid volume is 2mL.

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Abstract

The invention relates to an inorganic non-lead perovskite material with high fluorescence efficiency and a preparation method thereof, which belong to the technical field of preparation of perovskite crystal materials. The high fluorescence efficiency inorganic non-lead perovskite material is Cu-doped Cs 2 AgI 3 Perovskite, the doping amount of Cu is 0.09%. The preparation method is: first mix cesium iodide and silver iodide, then ball mill, then add cuprous iodide, hydroiodic acid, microliter hypophosphorous acid and seal and heat at 150-200°C. Finally, after cooling down to room temperature and annealing, cooling at -10°C to -35°C for 1h to 3h, Cs with high purity and enhanced fluorescence efficiency can be obtained 2 AgI 3 : Cu crystal, which emits bright blue fluorescence under the excitation of 302nm ultraviolet lamp, has the advantages of lead-free, chromium-free, high quantum efficiency and environmental 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 increasing Cs by doping Cu 2 AgI 3 Quantum efficiency, synthetic Cs 2 AgI 3 : Cu blue fluorescent material method. Background technique [0002] Renewable energy includes solar energy, water energy, wind energy, biomass energy, wave energy, tidal energy, ocean temperature difference energy, geothermal energy, etc. These energy sources are recyclable and renewable in nature, and are inexhaustible. If these energies can be utilized, it will greatly promote the development of human society. Therefore, photovoltaic cells that directly convert sunlight into electricity are of considerable interest. By the end of 2012, the cumulative installation of photovoltaics in the world reached about 100GWp (gigawatts). Among the solar cells in the world, 85% are crystalline silicon solar cells, and the rest are polycrystalline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/61
CPCC09K11/616
Inventor 解仁国姚佳利张资序
Owner JILIN UNIV
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