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Benzimidazole cationic two-dimensional perovskite material as well as preparation method and application thereof

A technology of benzimidazolium and perovskite materials, which is applied in the direction of luminescent materials, organic chemical methods, chemical instruments and methods, etc., can solve the problems of poor stability of two-dimensional perovskite, and achieve less crystal defect states and higher stability high effect

Active Publication Date: 2021-04-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, -type twisted corrugated two-dimensional materials have attracted extensive attention due to their single-component broad-peak white light emission characteristics, but the twisted corrugated configuration of -type two-dimensional (2D) materials is mainly composed of A-site cationic amine groups. The hydrogen bonding force formed between the hydrogen atoms on the surface and the halogen atoms of the lead-halogen octahedron is stable, so the structural stability of the two-dimensional perovskite material is relatively poor compared to the configuration.
A -type two-dimensional perovskite with a single component of white light has not yet been found with a regular and undistorted structure

Method used

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  • Benzimidazole cationic two-dimensional perovskite material as well as preparation method and application thereof
  • Benzimidazole cationic two-dimensional perovskite material as well as preparation method and application thereof
  • Benzimidazole cationic two-dimensional perovskite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Mix solid PbO (0.225mmol, 50mg) and benzimidazole (0.45mmol, 52.9mg) with 2mL of hydrobromic acid with a mass fraction of 48% in a glass tube at room temperature, heat to 95°C, and keep warm for 2h until the solid dissolves. Slowly cool to room temperature with the speed of 1 ℃ / h then, wash out with acetone from mother liquor after obtaining crystal, obtain a kind of light yellow flaky single crystal (C 7 h 7 N 2 ) 2 PbBr 4 (BM-Br).

[0044] Depend on figure 1 The single crystal diffraction pattern of BM-Br shows that the crystal structure of BM-Br is a type two-dimensional perovskite configuration, 2DPbBr 4 2- The inorganic layers are separated by benzimidazolium cations.

[0045] Such as image 3 As shown, the PXRD pattern of the final product sample after ball milling is consistent with that of the single crystal simulation, further confirming the structure of BM-Br.

[0046] Such as Figure 5 As shown, the color of BM-Br flake crystals is light yellow ( F...

Embodiment 2

[0053] Mix solid PbO (0.225mmol, 50mg) and benzimidazole (0.45mmol, 52.9mg) with 2mL of 37% hydrochloric acid in a glass tube at room temperature, heat to 95°C, keep warm for 2h to dissolve the solid, and then dissolve the solid with 1 The speed of ℃ / h was slowly cooled to room temperature, and the crystals were washed out from the mother liquor with acetone to obtain almost transparent needle-like crystals (C 7 h 7 N 2 ) 2 PbCl 4 (BM-Cl).

[0054] Depend on figure 2 The single crystal diffraction pattern of BM-Cl shows that the crystal structure of BM-Cl is a type two-dimensional perovskite configuration, 2DPbCl 4 2- The inorganic layers are separated by benzimidazolium cations.

[0055] Such as Figure 4 As shown, the PXRD pattern of the final product after ball milling is consistent with that of the single crystal simulation, further confirming the structure of BM-Cl.

[0056] Such as Image 6 As shown, the color of BM-Cl needle crystals is transparent ( Image...

Embodiment 3

[0064] Prepared by anti-solvent method (C 7 h 7 N 2 ) 2 PbBr 4 Single crystal steps are as follows:

[0065] Dissolve PbO (0.225mmol, 50mg) and benzimidazole (0.45mmol, 52.9mg) in 4mL hydrobromic acid with a mass fraction of 48%, to obtain a clear precursor solution, and then put the precursor solution in a small bottle , using acetone or diethyl ether as anti-solvent, after acetone or diethyl ether diffuse in this system for 24h, light yellow flaky crystals can be obtained (C 7 h 7 N 2 ) 2 PbBr 4 .

[0066] Compared with the material described in Example 1, the sheet material is smaller in size, and each has obvious grain boundaries.

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Abstract

The invention relates to a benzimidazole cation <100>-type two-dimensional perovskite material as well as a preparation method and an application thereof, and belongs to the technical field of luminescent materials. The chemical formula of the material is (C7H7N2)2BX4, B is a metal ion Pb<2+>, Sn<2+> or Ge<2+>, and X is a halogen ion Cl<-> or Br<->. The material has high stability, wherein <100>the type 2D perovskite material (C7H7N2) 2PbBr4 shows bright deep blue light emission. The <100>-type 2D perovskite material (C7H7N2)2PbCl4 with a regular structure is a single component white light emitting material. Compared with an anti-solvent method and a volatilization method, the crystal material prepared through the cooling method has a larger size, the obtained crystal is transparent and free of obvious crystal boundary, crystal defect states are few, and the crystal material is a nearly perfect single crystal material with the regular structure and an ordered long range.

Description

technical field [0001] The invention relates to a benzimidazolium cation <100> type two-dimensional perovskite material, a preparation method and an application thereof, and belongs to the technical field of luminescent materials. Background technique [0002] In the past decade, solid-state lighting (SSL) has emerged in the automotive lighting, architectural lighting and general lighting markets. Compared with traditional incandescent lamps and fluorescent lamps, it has the advantages of low energy consumption, high efficiency and long life. A typical SSL device consists of a light-emitting diode (LED) coated with a single phosphor (for example, a blue LED coated with a yellow phosphor) or an LED coated with a mixture of phosphors (for example, a UV LED coated with blue and yellow phosphors). LED). Although significant progress has been made in the down-conversion technology of white light-emitting diodes, there are still many problems and challenges that limit its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D235/06C09K11/06H01L33/50
CPCC07D235/06C09K11/06H01L33/502C09K2211/1044C07B2200/13Y02B20/00
Inventor 崔彬彬韩颖曹广岳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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