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A cspbi that improves stability 3 Nanocrystalline composite material and preparation method thereof

A composite material and nanocrystal technology, which is applied in the field of CsPbI3 nanocrystal composite material and its preparation, can solve the problems of complicated preparation process, weak stability, increase preparation cost, etc. Stable, low cost effect

Active Publication Date: 2022-05-24
中国计量大学上虞高等研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface ligand is an organic solvent, and its own stability is weak. Building a core-shell structure will complicate the preparation process and increase the preparation cost.

Method used

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  • A cspbi that improves stability <sub>3</sub> Nanocrystalline composite material and preparation method thereof
  • A cspbi that improves stability <sub>3</sub> Nanocrystalline composite material and preparation method thereof
  • A cspbi that improves stability <sub>3</sub> Nanocrystalline composite material and preparation method thereof

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Embodiment

[0028] A CsPbI with improved stability 3 Nanocrystalline composites composed of ammonium iodide particles and CsPbI 3 Nanocrystals are composited, and ammonium iodide particles are electrostatically adsorbed to CsPbI through surface ligands. 3 Nanocrystalline Surface, Ammonium Iodide and CsPbI 3 The molar ratio is 1-2:1-2.

[0029] A CsPbI with improved stability 3 The preparation method of the nanocrystalline composite material sequentially goes through the following steps:

[0030] (1) Add 1 mmol of cesium carbonate and 1 mmol of lead iodide to a mixture of 2 ml of oleic acid and 2 ml of octadecene by mole, grind at room temperature for 60 minutes, and then centrifuge and wash with cyclohexane to obtain CsPbI 3 Nanocrystalline.

[0031] (2) Dissolve 1 mmol of ammonium iodide crystal raw material in 2 liters of oleylamine solvent, grind for 30 minutes, and then wash with cyclohexane to remove excess oleylamine to obtain ammonium iodide crystals with oleylamine on the sur...

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Abstract

The invention belongs to the field of inorganic luminescent materials, a CsPbI with improved stability 3 Nanocrystalline composite material and preparation method thereof, the composite material is composed of ammonium iodide particles and CsPbI 3 Composite nanocrystals; the ammonium iodide particles are electrostatically adsorbed on CsPbI by surface ligands 3 nanocrystalline surface. The invention has the advantages of simple preparation method, low cost, and can significantly improve the CsPbI 3 Stability of nanocrystals in aqueous solution and fluorescence quantum efficiency.

Description

technical field [0001] The invention belongs to the field of inorganic light-emitting materials, in particular to a CsPbI with improved stability 3 Nanocrystalline composite material and preparation method thereof. Background technique [0002] Halide perovskite nanocrystals have excellent photoelectric response properties and are widely used in the research of solar cells, LED devices and photocatalysis, photodetectors and laser devices. By adjusting the type or proportion of halogen elements, Mn 2+ Ion doping and different preparation methods can effectively control the size and emission wavelength of perovskite nanocrystals. However, because halide perovskite nanocrystals are an ionic crystal material, they are easy to absorb water and deliquesce, and are very unstable and fluorescent. The strength will gradually weaken over time, especially in a humid environment, which will shorten the service life of related devices and is not conducive to practical applications. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/66
CPCC09K11/025C09K11/665
Inventor 雷磊华有杰邓德刚张军杰叶仁广徐时清
Owner 中国计量大学上虞高等研究院有限公司