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Method for preparing room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal

A nanocrystal, inorganic calcium technology, applied in nanotechnology, nano-optics, nanotechnology and other directions, can solve the problem that the ratio of halogen and cation is not easy to adjust, and achieve the effect of high stability and high quantum yield

Active Publication Date: 2017-11-03
HUBEI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In traditional room temperature synthesis methods, halogen atoms are always in proportion to cesium atoms and lead atoms, making it difficult to adjust the ratio of halogens to cations. However, halogen atoms are the key factors affecting the optical properties of perovskite nanocrystals, so increasing the content of halogens, Realization of halogen-rich synthesis of CsPbX 3 Perovskite nanocrystals, improving optical performance is an urgent issue in the field of optoelectronic display lighting

Method used

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  • Method for preparing room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal
  • Method for preparing room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal
  • Method for preparing room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal

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Embodiment 1

[0024] Described in this embodiment is literature (X.Li, D.Yu, F.Cao, Y.Gu, Y.Wei, Y.Wu, J.Song andH.Zeng, Adv.Funct.Mater., 2016,26 , 2435–2445) published CsPbBr 3 The synthesis method of inorganic perovskite nanocrystals is used as a comparison of the method of the present invention.

[0025] 1. Add 0.4mmol of PbBr 2 and 0.4mmol of CsBr were added to 10ml of DMF, and ultrasonically dissolved completely;

[0026] 2. Add 1ml of oleic acid and 0.5ml of oleylamine as surfactants to the above precursor solution and mix them evenly;

[0027] 3. Take 1ml of the mixed solution and pour it into 10ml of toluene, stir to make it react completely, the stirring speed is 800r / min, then mix the original solution and acetonitrile in a volume ratio of 1:1, and then centrifuge, the centrifugal speed is 8000r / min min, and the centrifugation time was 5 min, and finally the metal halide inorganic perovskite nanocrystals were obtained. See the test results figure 1

Embodiment 2

[0029] The method described in this embodiment is an improved method proposed by the present invention, and the same CsPbBr 3 Inorganic perovskite nanocrystal synthesis as an example.

[0030] 1. Add 0.4mmol of PbBr 2 and 0.4mmol of CsBr were added to 10ml of DMF, and ultrasonically dissolved completely;

[0031] 2. Add 1ml of oleic acid and 0.5ml of ammonium bromide to the above precursor solution and mix them evenly. The preparation method of ammonium bromide is to take an appropriate amount of NH 4 Br and oleylamine were added to a three-necked flask, and degassed under an inert gas atmosphere at 100°C for 1 hour to obtain a bromide solution;

[0032] 3. Take 1ml of the mixed solution and inject it into 10ml of toluene, stir to make the reaction complete, the stirring speed is 800r / min, then mix it with acetonitrile at a ratio of 1:1, and then centrifuge, the centrifugal speed is 8000r / min, the centrifugation time for 5 min, and finally the metal halide inorganic perovsk...

Embodiment 3

[0036] The present embodiment experiment 3a is identical with embodiment 1, just changes the centrifugal solvent into acetone on the basis of embodiment 1; Present embodiment experiment 3b is identical with embodiment 2, just changes the centrifugal solvent into acetone on the basis of embodiment 2 acetone.

[0037] Such as figure 2 As shown, the fluorescence quantum yield increased by 3 times after centrifugation with acetone to enrich the bromine.

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Abstract

The invention discloses a method for preparing room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal. The method is characterized by comprising the steps that alide amine is introduced on the basis of conventional room temperature synthesis of the inorganic perovskite nanocrystal, a polymeric pecursor solution in which the alide amine has been added is added into a polar solvent, and the CsPbX3 (X=Cl, Br, I or other mixtures) inorganic perovskite nanocrystal. Alide amine is prepared by adding NH4X into oleylamine and performing degassing for 1 h in the atmosphere of inert gas at 100 DEG C. The method has the advantages that according to room temperature halogen-enriched synthesis, the fluorescence quantum efficiency and stability are high, the method is simple, and the room temperature halogen-enriched CsPbX3 inorganic perovskite nanocrystal can be produced in a large scale. Compared with the CsPbX3 nanocrystal synthesized in a conventional method, the halogen-enriched synthesized CsPbX3 inorganic perovskite nanocrystal shows excellent optical property, high fluorescence quantum efficiency is still shown after purification many times and is 3-4.3 times the fluorescence quantum efficiency in the conventional method, and the application prospect of the method is improved.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photoelectric display lighting, in particular to a method for preparing nanocrystals, in particular to a high-quality CsPbX synthesized at room temperature 3 Preparation method of inorganic perovskite nanocrystals. Background technique [0002] In recent years, there have been many studies on the synthesis of inorganic perovskite nanocrystals at room temperature. Inorganic perovskite nanocrystals have excellent performance, simple preparation methods, adjustable wavelength of emitted light and cover the entire visible light range, narrow half-peak width, and high luminous efficiency. High, it has great application potential in the fields of lighting and display, solar cells and photodetectors. [0003] CaB 3 Compared with cadmium-containing nanocrystals, perovskite nanocrystals have stronger ionic character, and CsPbBr 3 Inorganic perovskite nanocrystals as an example, CsPbBr 3 Nanoc...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/665
Inventor 潘瑞琨梅明刘培朝方凡张阮王仁龙李阳
Owner HUBEI UNIV
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