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Perovskite nanocrystal with stable morphology at high temperature and preparation method thereof

A nanocrystal and perovskite technology, applied in the fields of nanotechnology, nanotechnology, nanooptics, etc. for materials and surface science, can solve problems such as application obstacles, agglomeration growth, and limitation of perovskite nanocrystals. Good monodispersity, enhanced bonding, good monochromatic effect

Pending Publication Date: 2022-03-11
MINDU INNOVATION LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] All-inorganic perovskite nanocrystals are an excellent luminescent material, but they tend to lose surface ligands at high temperatures and agglomerate to grow.
This not only severely limits the application of perovskite nanocrystals in high-energy LEDs, lasers, and solar cells, but also hinders the surface engineering of perovskite nanocrystals.

Method used

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  • Perovskite nanocrystal with stable morphology at high temperature and preparation method thereof
  • Perovskite nanocrystal with stable morphology at high temperature and preparation method thereof
  • Perovskite nanocrystal with stable morphology at high temperature and preparation method thereof

Examples

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preparation example Construction

[0021] The invention provides a kind of synthetic method of high temperature stable perovskite nanocrystal, comprising the following steps:

[0022] a. Cs(CH 3 COOH), octadecene and oleic acid were mixed, heated to 150°C under a nitrogen atmosphere, and reacted for 30 minutes to obtain a cesium precursor, which was kept at 150°C for use;

[0023] b. Dissolve lead halide in a mixture of octadecene, oleic acid and oleylamine at 180~200°C under nitrogen protection to obtain a lead precursor, and keep it at 180~200°C for use;

[0024] c. Dissolve metal-doped halides in octadecene, oleic acid, and oleylamine at a high temperature of 150-170°C under nitrogen protection to obtain a transparent metal-doped precursor solution, which is kept at 100°C for use;

[0025] d. First inject the cesium precursor obtained in step a into the lead precursor obtained in step b, and after reacting for 1 minute, inject the doped metal halide precursor obtained in step c, and react for 5 to 180 minut...

Embodiment 1

[0038] This example mainly demonstrates the instability of the morphology of perovskite nanocrystals doped with metal ions according to the present invention at high temperature.

[0039] 1. Weigh Cs(CH 3 COOH) powder 0.12 g, oleic acid 0.3 ml, octadecene 5 ml, put into a 25 ml three-necked flask. where Cs(CH 3The molar ratio of COOH) to oleic acid is 1:1.5, and the molar concentration of cesium ions is 0.12 mmol / ml. Nitrogen was introduced while magnetically stirring, and after deoxygenation for 30 minutes, the flask was heated to 150°C and kept for 30 minutes to obtain a light yellow transparent cesium precursor solution, which was kept at 150°C for use.

[0040] 2. Weigh PbCl 2 Add 0.069 g of powder, 0.011 g of ZnCl2 powder, 0.5 ml of oleic acid, 0.5 ml of oleylamine and 5 ml of octadecene into a 25 ml three-necked flask. where PbCl 2 The molar ratio of oleic acid to oleic acid is 1:1, and the molar ratio of oleic acid to oleylamine is 1.08:1. The molar concentration ...

Embodiment 2

[0044] This example is used to demonstrate that the doped perovskite nanocrystals prepared by the method of the present invention have good shape stability at high temperature.

[0045] 1. Weigh Cs(CH 3 COOH) powder 0.12 g, oleic acid 0.3 ml, octadecene 5 ml, put into a 25 ml three-necked flask. where Cs(CH 3 The molar ratio of COOH) to oleic acid is 1:1.5, and the molar concentration of cesium ions is 0.12 mmol / ml. Nitrogen was introduced while magnetically stirring, and after deoxygenation for 30 minutes, the flask was heated to 150°C and kept for 30 minutes to obtain a light yellow transparent cesium precursor solution, which was kept at 150°C for use.

[0046] 2. Weigh PbCl 2 Add 0.069 g of powder, 0.5 ml of oleic acid, 0.5 ml of oleylamine and 5 ml of octadecene into a 25 ml three-necked flask. where PbCl 2 The molar ratio of oleic acid to oleic acid is 1:1, and the molar ratio of oleic acid to oleylamine is 1.08:1. The molar concentration of lead ions is 0.4 mmol / m...

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Abstract

The invention discloses a perovskite nanocrystal with a stable morphology at a high temperature and a preparation method of the perovskite nanocrystal, nanocrystal agglomeration caused by falling of a ligand at a high temperature is inhibited by carrying out cation doping in the perovskite nanocrystal, and the high-temperature stability of the nanocrystal is greatly improved. The preparation method comprises the following specific steps: a, mixing Cs (CH3COOH), octadecene and oleic acid, and carrying out a heating reaction under a protective atmosphere condition to obtain a cesium oleate precursor solution; b, dissolving lead halide in a mixture of octadecene, oleic acid and oleylamine at a high temperature in a protective atmosphere; and c, dissolving the metal-doped halide in a mixture of octadecene, oleic acid and oleylamine at a high temperature in a protective atmosphere to obtain a transparent liquid. D, rapidly injecting the cesium precursor in the step a into the liquid in the step b, reacting for 1 minute, injecting the transparent liquid in the step c, reacting for 30 minutes, and rapidly cooling to room temperature, and e, centrifugally purifying to obtain the perovskite-doped nanocrystal with stable morphology at high temperature.

Description

technical field [0001] The invention belongs to the field of nanocrystalline materials, and in particular relates to a perovskite nanocrystal with a stable shape at high temperature and a preparation method thereof. Background technique [0002] All-inorganic perovskite nanocrystals are an excellent luminescent material, but they tend to lose surface ligands at high temperatures and agglomerate to grow. This not only severely limits the application of perovskite nanocrystals in high-energy LEDs, lasers, and solar cells, but also hinders the surface engineering of perovskite nanocrystals. Contents of the invention [0003] In view of this, the technical problem to be solved in the present invention is to provide a method for obtaining perovskite nanocrystals with stable morphology at high temperatures, and the perovskite nanocrystals obtained by the present invention have good morphology stability at high temperatures . [0004] To achieve the above object, the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00
CPCC09K11/025C09K11/665B82Y20/00B82Y30/00
Inventor 朱浩淼徐昆源
Owner MINDU INNOVATION LAB
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