High-efficiency white-light organic-inorganic hybrid zinc-based two-dimensional perovskite material and preparation thereof

A perovskite material and hybrid zinc technology, which is applied in semiconductor/solid-state device manufacturing, semiconductor devices, electrical components, etc., can solve the problem of low quantum yield of photoluminescence, achieve improved luminescence performance, good stability, The effect of high photoluminescence quantum yield

Pending Publication Date: 2022-01-14
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The invention solves the technical problem that the photoluminescence quantum yield of the organic-inorganic hybrid two-dimensional perovskite material that emits white light is very low in the prior art, and provides a high-efficiency white light organic-inorganic hybrid zinc-based two-dimensional perovskite Mineral material and preparation method, the organic-inorganic hybrid zinc-based two-dimensional perovskite material of the present invention has high purity, uses non-toxic zinc metal ions to replace heavy metal lead ions, its emission spectrum covers the entire visible light range, and the photoluminescence quantum efficiency High, good stability, and its preparation process is simple, low cost, and environmentally friendly, and efficient single-component white light-emitting diodes can be designed

Method used

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  • High-efficiency white-light organic-inorganic hybrid zinc-based two-dimensional perovskite material and preparation thereof

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preparation example Construction

[0045] A method for preparing a high-efficiency white-light organic-inorganic hybrid zinc-based two-dimensional perovskite material of the present invention mainly includes the following steps:

[0046] (1) Weigh a certain mass of zinc halide under an inert atmosphere, dissolve it in a volatile polar solvent, stir until the solution is clear, and obtain a premix X;

[0047] (2) dissolving the organic amine containing A in the stoichiometric ratio in the same volatile polar solvent, stirring until the solution is clear, and obtaining the premix Y;

[0048] (3) Mix the premix solution X with the premix solution Y, then add the corresponding molar volume of hydrohalic acid dropwise, stir until the solution is clear, and obtain the premix solution Z;

[0049] (4) Seal the premix Z obtained in step (3) with a sealing film, poke some small holes to control the volatilization rate of the solvent, place it at room temperature and slowly evaporate for several days, and colorless non-le...

Embodiment 1

[0058] 1mmol zinc chloride (ZnCl 2 ) and 2mmol phenethylamine (C 6 h 5 C 2 h 4 NH 2 ) was dissolved in 2ml of methanol, and the two premixes were evenly mixed, then 160 μl of hydrochloric acid was added, and vigorously stirred at room temperature for 4 hours at a speed of 800-1000 rpm / min to obtain a clear and transparent solution. The solution was sealed with a sealing film with several small holes, and left to evaporate slowly at room temperature for several days, and colorless crystals precipitated at the bottom of the container. The obtained crystals were washed three times with isopropanol, and dried in a vacuum oven at 60°C for one day to obtain the organic-inorganic hybrid zinc-based two-dimensional perovskite material PEA 2 ZnCl 4 . The obtained organic-inorganic hybrid zinc-based two-dimensional perovskite material has a quantum yield of 2.9%, a fluorescence lifetime of 3.19ns, a luminescent center at 521nm, and a half-peak width of 175nm.

Embodiment 2

[0060] 1mmol zinc chloride (ZnCl 2 ) and 2mmol phenethylamine (C 6 h 5 C 2 h 4 NH 2 ) was dissolved in 2ml of methanol, and the two premixed solutions were evenly mixed, then a mixed acid solution containing 150 μl of hydrochloric acid and 5 μl of hydrofluoric acid was added, and vigorously stirred at room temperature for 4 hours at a speed of 800-1000 rpm / min to obtain a clear and transparent solution . The solution was sealed with a sealing film with several small holes, and left to evaporate slowly at room temperature for several days, and colorless crystals precipitated at the bottom of the container. The obtained crystals were washed three times with isopropanol, and dried in a vacuum oven at 60°C for one day to obtain the organic-inorganic hybrid zinc-based two-dimensional perovskite material PEA 2 Zn(F x Cl 1-x ) 4 (x=1 / 16). The obtained organic-inorganic hybrid zinc-based two-dimensional perovskite material has a quantum yield of 7.5%, a fluorescence lifetime...

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Abstract

The invention relates to a high-efficiency white-light organic-inorganic hybrid zinc-based two-dimensional perovskite material and preparation thereof, and belongs to the technical field of photoelectric materials. The preparation method comprises the following steps: respectively dissolving zinc halide and organic amine in polar solvents with the same volatility to obtain a premixed solution X and a premixed solution Y; after mixing, dropwise adding haloid acid so that organic amine is protonized to form organic amine ions, and reacting with zinc ions and halogen ions to obtain a premixed solution Z; and after the solvent is volatilized, separating out the organic-inorganic hybrid zinc-based two-dimensional perovskite crystal, wherein the general formula of the organic-inorganic hybrid zinc-based two-dimensional perovskite crystal is A2ZnX4, A is an aromatic amine cation, and X is one or a mixture of more of halogen elements F, Cl and Br. The organic-inorganic hybrid zinc-based two-dimensional perovskite material provided by the invention is high in purity, heavy metal lead ions are replaced by non-toxic zinc metal ions, the emission spectrum of the organic-inorganic hybrid zinc-based two-dimensional perovskite material covers the whole visible light range (400-750 nm), and the organic-inorganic hybrid zinc-based two-dimensional perovskite material is high in photoluminescence quantum yield and good in stability.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and more specifically relates to a high-efficiency white light organic-inorganic hybrid zinc-based two-dimensional perovskite material and its preparation. Background technique [0002] As a new generation of lighting products, white light-emitting diodes (WLEDs) have replaced fluorescent lamps and entered thousands of households due to their advantages of energy saving, environmental protection, high efficiency, stability, and durability. Traditional artificial white light is generally obtained by incandescent lamps and fluorescent lamps, but light-emitting diodes (LEDs) have gradually entered people's field of vision due to their higher electroluminescent efficiency, which is crucial to achieving energy sustainability . However, wide-spectrum white light-emitting LEDs are usually obtained by coating yellow phosphors on blue LED chips or coating phosphors of various colors on ul...

Claims

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Application Information

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IPC IPC(8): H01L51/56H01L51/50
CPCH10K71/15H10K71/12H10K50/11Y02B20/00
Inventor 常海欣叶港
Owner HUAZHONG UNIV OF SCI & TECH
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