Preparation method of perovskite type nanocrystalline

A perovskite type and nanocrystal technology, applied in nanotechnology, nano optics, nanotechnology, etc., can solve the problems of poor performance of perovskite quantum dots and insufficient halogen ratio

Active Publication Date: 2017-05-31
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] For existing technologies with PbX 2 Insufficient ratio of halogen in the reaction process caused by raw materials, resulting in poor performance of the synthesized perovskite quantum dots, the invention provides a method for preparing perovskite nanocrystals, the method synthesizes perovskite nanocrystals The type and proportion of halogen can be adjusted at the same time, and the performance of perovskite nanocrystals can be controlled. The method is simple, and the synthesized perovskite nanocrystals have good photoelectric conversion performance.

Method used

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  • Preparation method of perovskite type nanocrystalline

Examples

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Embodiment 1

[0082] A preparation method of perovskite nanocrystals, said method comprising the following steps:

[0083] (1) Dry oleic acid at 100°C for 120min, mix 1 part of CsCl, 35 parts of eicosene and 2 parts of oleic acid, vacuum degas, dry at 100°C for 120min, and heat to 120°C under the protection of argon. ℃ for 0.5h to obtain cesium oleate solution;

[0084] (2) Dry oleylamine and oleic acid at 100°C for 120 min, add 4 parts of PbO, 20 parts of NH 4 Cl and 600 parts of eicosene were mixed, vacuum degassed, dried at 100°C for 60 minutes, then injected with 50 parts of oleylamine and 50 parts of oleic acid, vacuum degassed, dried at 100°C for 120 minutes, heated to 120°C, Inject the cesium oleate solution that step (1) obtains under gas protection, react quickly for 15s, and cool in an ice bath;

[0085] (3) Add an equal volume of acetone to the reaction in step (2) and the cooled stock solution, centrifuge at 8000rpm for 5min, and get the precipitate; disperse the precipitate i...

Embodiment 2

[0088] A preparation method of perovskite nanocrystals, said method comprising the following steps:

[0089] (1) Dry oleic acid at 150°C for 10min, mix 1 part of CsBr, 75 parts of octadecene and 5 parts of oleic acid, vacuum degas, dry at 150°C for 10min, and heat to 180°C under nitrogen protection Reaction 3h, obtains cesium oleate solution;

[0090] (2) Dry oleylamine and oleic acid at 150°C for 10 minutes, mix 12 parts of PbO, 40 parts of NH 4 Br and 1000 parts of octadecene were mixed, vacuum degassed, dried at 150°C for 10 minutes, then injected with 80 parts of oleylamine and 80 parts of oleic acid, vacuum degassed, dried at 150°C for 10 minutes, heated to 250°C, Inject the cesium oleate solution obtained in step (1) under protection, react quickly for 1 s, and cool in an ice bath;

[0091] (3) Add an equal volume of acetone to the reaction in step (2) and the cooled stock solution, centrifuge at 12000rpm for 1min, and get the precipitate; disperse the precipitate in t...

Embodiment 3

[0094] A preparation method of perovskite nanocrystals, said method comprising the following steps:

[0095] (1) Dry the oleic acid at 120°C for 60min, add 1 part of Cs 2 1. 50 parts of hexadecene and 3.2 parts of oleic acid were mixed, vacuum degassed, dried at 120° C. for 60 minutes, and heated to 150° C. for 1 hour under argon protection to obtain cesium oleate solution;

[0096] (2) Dry oleylamine and oleic acid at 120°C for 60 minutes, mix 8 parts of PbO, 32 parts of NH 4 I and 800 parts of hexadecene were mixed, vacuum degassed, dried at 120°C for 0.5min, then injected with 66 parts of oleylamine and 67 parts of oleic acid, vacuum degassed, dried at 120°C for 60min, heated to 180°C, Inject the cesium oleate solution obtained in step (1) under nitrogen protection, react quickly for 5s, and cool in an ice bath;

[0097] (3) Add an equal volume of acetone to the reaction in step (2) and the cooled stock solution, centrifuge at 10000rpm for 3min, and get the precipitate; d...

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Abstract

The invention relates to a preparation method of perovskite type nanocrystalline. The perovskite type nanocrystalline is CsPbXY, wherein X is selected from any one of Cl, Br or I; Y is selected from any one of Cl, Br or I; X is different from Y; a is greater than or equal to 0, b is greater than or equal to 0, and a+b=3. The method comprises the steps that cesium salt, long-chain olefin and oleic acid are mixed; under the inert gas protection, heating reaction is performed to obtain an oleic acid cesium solution; PbO, ammonium halide and long-chain olefin are mixed; then, oleylamine and oleic acid are injected; heating is performed; the oleic acid cesium solution is injected under the inert gas protection; reaction and cooling are performed to obtain the CsPbXY perovskite type nanocrystalline. When the method is used for synthesizing the perovskite type nanocrystalline, the types and the proportion of halogen can be regulated and controlled; the performance of the perovskite type nanocrystalline is controlled; the method is simple; the photoelectric conversion performance of the synthesized perovskite type nanocrystalline is good; meanwhile, the synthetic raw materials use low-toxicity PbO; green and environment-friendly effects are achieved.

Description

technical field [0001] The invention belongs to the field of photoelectric materials, and relates to a method for preparing quantum dots, in particular to a method for preparing perovskite nanocrystals. Background technique [0002] In recent years, there have been many studies on inorganic perovskite-type quantum dots. Inorganic perovskite-type quantum dots have unique properties, simple preparation methods, adjustable wavelength of emitted light in the visible light band, narrow half-maximum width, and high luminous efficiency. There is a strong potential for applications in white LEDs, QLEDs, and photodetectors. [0003] CbBr 3 Perovskite quantum dots have stronger ionic characteristics than general quantum dots containing spacers, so they are very sensitive to polar solvents and surfactants, CsPbBr 3 Inorganic perovskite quantum dots have a dissolution equilibrium principle, CsPbBr 3 The size of the inorganic perovskite quantum dots is adjusted by washing the polar so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y30/00B82Y40/00C01G21/00
CPCC09K11/665B82Y20/00B82Y30/00B82Y40/00C01G21/006
Inventor 王恺孙小卫刘皓宸刘培朝曹万强郝俊杰周子明
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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