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

A technology of copper doping and inorganic calcium, applied in the direction of luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of poor conductivity of perovskite thin films and achieve optical performance improvement and efficiency Effects of Lifting, Quantum Yield, and Nanocrystal Lifetime Enhancement

Active Publication Date: 2021-05-14
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063]Example 1CU0.6-CSPB0.4CL3Preparation

[0064](1) 0.4g CS2CO320 ml of octadene and 1.5 ml oleic acid were added to the three-neck flask, and then heated to 120 ° C under vacuum, then the AR reaction was 1 h, resulting in a precursor;

[0065](2) 0.08g Cucl21 ml olelamine and 5 mL of octadene were added to the three-neck flask, heated to 100 ° C under AR protection;

[0066](3) 0.08g Cucl20.114G PBCL2In the formation of 10 ml of octadene, it was heated to 120 ° C under vacuum, and 1 ml of oleic acid and 1 ml of olelamine were added, and then the AR reaction was transferred for 10 minutes and 1 ml of triamatyl phosphorus (TOP), Then continue to react 50 min. Then, the precursor was added to 200 ° C, and the precursor was prepared in 1 ml of step (1) was added, and the reaction was 1min, and then cooled to room temperature with ice water;

[0067](4) Cu-CSPBCL obtained by step (3)3Cucl obtained in solution and step (2)2The solution was mixed, the temperature was set to 100 ° C, the stirring t...

Embodiment 2

[0069]Example 2CU0.6-CSPB0.4(CL / BR)3Preparation

[0070](1) 0.4g CS2CO320 ml of octadene and 1.5 ml oleic acid were added to the three-neck flask, and then heated to 120 ° C under vacuum, then the AR reaction was 1 h, resulting in a precursor;

[0071](2) 0.08g Cucl21 ml olelamine and 5 mL of octadene were added to the three-neck flask, heated to 100 ° C under AR protection;

[0072](3) 0.08g Cucl20.114G PBCL2In the formation of 10 ml of octadene, it was heated to 120 ° C under vacuum, and 1 ml of oleic acid and 1 ml of olelamine were added, and then the AR reaction was transferred for 10 minutes and 1 ml of triamatyl phosphorus (TOP), Then continue to react 50 min. Then, the precursor was added to 200 ° C, and the precursor was prepared in 1 ml of step (1) was added, and the reaction was 1min, and then cooled to room temperature with ice water;

[0073](4) Cu-CSPBCL obtained by step (3)3Cucl obtained in solution and step (2)2The solution was mixed, the temperature was set to 100 ° C, the sti...

experiment example 1

[0076]Experimental Example 1 Structure Characterization of Copper Doped Oterocate Infrastructant Calcanotium Mine

[0077]The purple light Cu prepared in Example 1 and Example 2 was prepared by Fei Tecnai G2 F20 S-TEM.0.6-CSPB0.4CL3Blu-ray Cu0.6-CSPB0.4(Br / cl)3The morphology structure and two-dimensional size are characterized.figure 1 Indicated.

[0078]Fromfigure 1 Can be learned infigure 1 Medium (a) undoped CSPBCL3Still has a traditional quantum point in shape, with an average particle size of 7.7 nm. Further, the present invention has been prepared by two step passivation, Cu-CSPBCl3The micro-morphology of the two-dimensional nanoflake is present, with an average particle diameter of 47.5 nm. After the anion exchange, although prepared Cu-CSPB (BR / CL)3The size of the blue nano sheet is slightly reduced (the average particle size is 19.23 nm), but still maintains the morphology of the two-dimensional nanofile.

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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: a) heating and reacting a mixture of a cesium source, a solvent and a ligand I in an oxygen-free environment to obtain a precursor A; b) obtaining a copper source, a solvent and a Mixture B of Ligand II; c) Under vacuum conditions, mix copper source, lead source, solvent, Ligand I and Ligand II, heat the reaction, and add Ligand III to react under a non-oxidizing atmosphere to obtain Mixed solution C; d) the precursor A and the mixed solution C are reacted under heating conditions and then lowered to room temperature; the mixed solution B is added, and the reaction is stirred under heating to obtain a copper-doped quasi-two-dimensional purple all-inorganic perovskite materials. The above method passivates defects inside and on the surface of the perovskite crystal by doping the transition metal Cu, and improves the short-range order of the crystal, so that the all-inorganic perovskite material has a quasi-two-dimensional nanosheet morphology.

Description

Technical field[0001]The present invention relates to the field of perovskite materials, in particular, to copper doping for two-dimensional all-inorganizing calcium-titanium mine materials and a preparation method thereof.Background technique[0002]In recent years, all inorganic calcium-titanium mines CSPBX3(X = CL, BR, I) Due to the excellent optical characteristics having a tunable luminescence wavelength, a high quantum yield, a narrow transmit line width, a hot material such as a light-emitting diode, a solar cell, a photodetector, and the like.[0003]In CSPBX3In the family, the CSPBBR that presents green light3CSPBI emitted with red light3The photoluminescent quantum yield (PLQY) has reached approximately 100%, exhibiting extremely high luminous efficiency. In contrast, a purple shiny CSPBCL3And blue glowing CSPBBRxCL3-xThe quantum yield is far behind. Blue violet as a blue light in white light, and low quantum yields severely limits its further application in the optical field....

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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