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Preparation method of CsPb2Br5 nanosheet

A technology of nanosheets and oleic acid, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., to achieve the effect of stable light response and wide application prospects

Active Publication Date: 2017-11-03
北京京通光能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above reports related to the CsPb 2 Br 5 Tuning the morphology of nanosheets to realize the regulation of their luminescent properties, and their applications in green LEDs and photodetection

Method used

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  • Preparation method of CsPb2Br5 nanosheet
  • Preparation method of CsPb2Br5 nanosheet
  • Preparation method of CsPb2Br5 nanosheet

Examples

Experimental program
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Embodiment 1

[0029] Example 1 CsPb 2 Br 5 preparation of

[0030] Preparation of CsPb by hot injection method 2 Br 5 Nanosheets, the preparation steps are:

[0031] (1) Mix 625mg of cesium stearate, 10ml of octadecene and 0.5ml of oleic acid under the environment of feeding nitrogen and maintaining mechanical magnetic stirring, and heating to 140°C for 0.5h to obtain a cesium oleate solution;

[0032] (2) Mix 100mg of lead bromide, 7.5ml of octadecene, 0.5ml of octylamine and 0.5ml of oleic acid, heat to 100°C and mix and stir for 0.5h to obtain PbBr 2 Precursor solution;

[0033] (3) Add 0.375ml of cesium oleate solution to PbBr by hot injection method 2 Precursor solution, the two were mixed and stirred for 3 hours to obtain a crude product, which cannot be used directly because of the presence of ligands on the surface of the crude product, and must be purified. The purification method is to add the same amount of toluene as the crude product, centrifuge at 8000r for 5min, repeat...

Embodiment 2

[0034] Example 2 CsPb 2 Br 5 preparation of

[0035] Preparation of CsPb by hot injection method 2 Br 5 Nanosheets, the preparation steps are:

[0036] (1) Mix 625mg of cesium stearate, 10ml of octadecene and 0.5ml of oleic acid under the environment of feeding nitrogen and maintaining mechanical magnetic stirring, and heating to 140°C for 0.5h to obtain a cesium oleate solution;

[0037] (2) Mix 100mg of lead bromide, 7.5ml of octadecene, 0.5ml of octylamine and 0.5ml of oleic acid, heat to 120°C and mix and stir for 0.5h to obtain PbBr 2 Precursor solution;

[0038] (3) Add 0.375ml of cesium oleate solution to PbBr by hot injection method 2 Precursor solution, the two were mixed and stirred for 3h, and the crude product was purified to obtain CsPb 2 Br 5 Nanosheets.

Embodiment 3

[0039] Example 3 CsPb 2 Br 5 preparation of

[0040] Preparation of CsPb by hot injection method 2 Br 5 Nanosheets, the preparation steps are:

[0041] (1) Mix 625mg of cesium stearate, 10ml of octadecene and 0.5ml of oleic acid under the environment of feeding nitrogen and maintaining mechanical magnetic stirring, and heating to 140°C for 0.5h to obtain a cesium oleate solution;

[0042] (2) Mix 100mg of lead bromide, 7.5ml of octadecene, 0.5ml of octylamine and 0.5ml of oleic acid, heat to 140°C and mix and stir for 1h to obtain PbBr 2 Precursor solution;

[0043] (3) Add 0.375ml of cesium oleate solution to PbBr by hot injection method 2 Precursor solution, the two were mixed and stirred for 3h, and the crude product was purified to obtain CsPb 2 Br 5 Nanosheets.

[0044] The CsPb prepared by embodiment 1-3 2 Br 5 Nanosheets were dispersed in toluene for preservation.

[0045] figure 1 Be the CsPb prepared under the different temperatures of embodiment 1-3 2 Br ...

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Abstract

The invention relates to a preparation method of an adjustable luminescent CsPb2Br5 nanosheet, a product and application thereof. The preparation method comprises the following steps: under nitrogen protection, mixing cesium stearate, octadecene and oleic acid to prepare a caesium oleate solution; additionally, mixing lead bromide, octadecene, octylame and oleic acid, heating and stirring to obtain a PbBr2 precursor solution; and then adding the caesium oleate solution into the PbBr2 precursor solution, mixing and stirring to obtain the CsPb2Br5 nanosheet. Different sizes of CsPb2Br5 nanosheets are obtained by regulating and controlling the reaction temperature of preparing the PbBr2 precursor solution to be 100 to 140 DEG C, and the photoluminescence gradually changes into green light from blue light. The obtained CsPb2Br5 nanosheets can be used for preparing light-emitting diodes, solar cells or photoelectric detectors, and the light-emitting efficiency of high-monochromaticity green light LEDs constructed by preparing the CsPb2Br5 nanosheets reaches 34.49 lm / W.

Description

technical field [0001] The invention belongs to the field of nanometer materials and relates to CsPb 2 Br 5 The preparation method of nanosheets also relates to the products and applications obtained by this preparation method. Background technique [0002] Inorganic perovskite nanomaterials (CsPb 2 x 5 , X=Cl, Br, I) is a new type of functional material, which has special properties in light-emitting diodes, solar cells, photodetectors, etc., and is widely used in the field of optoelectronic devices. In recent years, CsPb2X5 nanomaterials have attracted the attention of a large number of researchers, especially their morphology and applications. For example, "Applied Chemistry International Edition" (Angew.Chem.Int.Ed, 2016, 55, 8328) of the German Chemical Society reported a fast ion exchange method, which successfully prepared a large amount of highly efficient luminescent CsPb 2 Br 5 Nanosheets; American Chemical Society's "Advanced Optical Materials" (Adv.Opt.Mate...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/66B82Y40/00H01L33/50H01L31/08B82Y30/00
CPCB82Y30/00B82Y40/00C01G21/006C01P2002/72C01P2004/03C01P2004/04C01P2004/24C01P2004/62C01P2004/64C09K11/665H01L31/08H01L33/502
Inventor 臧志刚韩层李存龙唐孝生
Owner 北京京通光能科技有限公司
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