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Copper-doped quasi-two-dimensional full-inorganic perovskite material and preparation method thereof

A copper-doped, inorganic calcium technology, used in luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve problems such as poor conductivity of perovskite films, improve optical properties, increase Quantum yield, effect of reducing defect states

Active Publication Date: 2020-04-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are three main ways to improve the quantum yield of blue-violet light: (1) Dimensional control: this method is to introduce organic ammonium salt or other organic long-chain ligands into the three-dimensional perovskite material, and separate it into different The number of layers of quasi-two-dimensional perovskite or quantum dots improves the luminous yield of perovskite by strengthening the quantum confinement effect; the disadvantage of this method is that a large number of long-chain organic ligands lead to poor conductivity of the perovskite film, and the layer It is difficult to precisely control the number, which will lead to the simultaneous appearance of multiple luminescence peaks

Method used

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  • Copper-doped quasi-two-dimensional full-inorganic perovskite material and preparation method thereof
  • Copper-doped quasi-two-dimensional full-inorganic perovskite material and preparation method thereof
  • Copper-doped quasi-two-dimensional full-inorganic perovskite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1Cu 0.6 -CsPb 0.4 Cl 3 preparation of

[0064] (1) Add 0.4g Cs 2 CO 3 , 20mL of octadecene and 1.5mL of oleic acid were added to a three-necked flask, heated to 120°C under vacuum, and then passed through Ar to react for 1h to obtain a precursor;

[0065] (2) 0.08g CuCl 2 , 1mL oleylamine and 5mL octadecene were added to a three-necked flask, and heated to 100°C under the protection of Ar for later use;

[0066] (3) 0.08g CuCl 2 , 0.114g PbCl 2 and 10 mL of octadecene were added to a three-necked flask, heated to 120°C under vacuum, and 1 mL of oleic acid and 1 mL of oleylamine were added, followed by passing through Ar for 10 minutes and adding 1 mL of tri-n-octylphosphine (TOP), Then continue to react for 50min. Then the temperature was raised to 200°C, and 1 mL of the precursor prepared in step (1) was added immediately, reacted for 1 min, and then cooled to room temperature with ice water;

[0067] (4) Cu-CsPbCl obtained in step (3) 3 CuCl obtaine...

Embodiment 2

[0069] Example 2Cu 0.6 -CsPb 0.4( Cl / Br) 3 preparation of

[0070] (1) Add 0.4g Cs 2 CO 3 , 20mL of octadecene and 1.5mL of oleic acid were added to a three-necked flask, heated to 120°C under vacuum, and then passed through Ar to react for 1h to obtain a precursor;

[0071] (2) 0.08g CuCl 2 , 1mL oleylamine and 5mL octadecene were added to a three-necked flask, and heated to 100°C under the protection of Ar for later use;

[0072] (3) 0.08g CuCl 2 , 0.114g PbCl 2 and 10 mL of octadecene were added to a three-necked flask, heated to 120°C under vacuum, and 1 mL of oleic acid and 1 mL of oleylamine were added, followed by passing through Ar for 10 minutes and adding 1 mL of tri-n-octylphosphine (TOP), Then continue to react for 50min. Then the temperature was raised to 200°C, and 1 mL of the precursor prepared in step (1) was added immediately, reacted for 1 min, and then cooled to room temperature with ice water;

[0073] (4) Cu-CsPbCl obtained in step (3) 3 CuCl ob...

experiment example 1

[0076] Experimental example 1 Structural characterization of copper-doped all-inorganic perovskite materials

[0077] Adopt FEI Tecnai G2 F20 S-TWI type TEM to the purple light Cu that prepares in embodiment 1 and embodiment 2 0.6 -CsPb 0.4 Cl 3 and Blu-ray Cu 0.6 -CsPb 0.4 (Br / Cl) 3 The morphology and two-dimensional size were characterized, and the results are as follows figure 1 shown.

[0078] from figure 1 It can be seen from figure 1 Middle (a) undoped CsPbCl 3 It still has the traditional quantum dot morphology, with an average particle size of 7.7nm. And the optimized Cu-CsPbCl prepared by the present invention after two-step passivation 3 Then it presents the microscopic morphology of two-dimensional nanosheets, with an average particle size of 47.5nm. After anion exchange, although the prepared Cu-CsPb(Br / Cl) 3 The size of the blue-light nanosheets was slightly reduced (average particle size was 19.23 nm), but the morphology of the two-dimensional nanoshe...

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Abstract

The invention relates to a copper-doped quasi-two-dimensional full-inorganic perovskite material and a preparation method thereof. The method comprises the following steps: a) performing a heating reaction on a mixed solution of a cesium source, a solvent and a ligand I in an oxygen-free environment to obtain a precursor A; b) acquiring a mixed solution B of a copper source, a solvent and a ligandII in a non-oxidizing atmosphere under a heating condition; c) under a vacuum condition, mixing a copper source, a lead source, a solvent, the ligand I and the ligand II, carrying out a heating reaction, and adding the ligand III under a non-oxidizing atmosphere for a reaction so as to obtain a mixed solution C; and d) reacting the precursor A with the mixed solution C under a heating condition,carrying out cooling to room temperature, adding the mixed solution B, and carrying out a stirring reaction under heating to obtain the copper-doped quasi-two-dimensional purple-light full-inorganic perovskite material. According to the method, defects inside and on the surface of perovskite crystals are passivated by doping the transition metal Cu, so the short-range order degree of the crystalsis improved, and the full-inorganic perovskite material has a quasi-two-dimensional nanosheet morphology.

Description

technical field [0001] The invention relates to the field of perovskite materials, in particular to a copper-doped quasi-two-dimensional all-inorganic perovskite material and a preparation method thereof. Background technique [0002] In recent years, the all-inorganic perovskite CsPbX 3 (X=Cl, Br, I) has become a popular material in photovoltaic fields such as light-emitting diodes, solar cells, and photodetectors due to its excellent optical properties such as tunable emission wavelengths, high quantum yields, and narrow emission line widths. [0003] In CsPbX 3 In the family of CsPbBr that exhibits green light emission 3 and red-emitting CsPbI 3 The photoluminescence quantum yield (PLQY) has reached nearly 100%, showing extremely high luminous efficiency. In contrast, purple-emitting CsPbCl 3 and blue-emitting CsPbBr x Cl 3-x The quantum yield is far behind. As white light, blue-violet light emits blue light, one of the three primary colors, and its low quantum yi...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C09K11/665
Inventor 杨维清高玥骆超李文闫成
Owner SOUTHWEST JIAOTONG UNIV
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