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Preparation method of Bi-based perovskite quantum dot material

A quantum dot material, perovskite technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of poor concentration stability, affecting the application prospect of Pb-based perovskite quantum dots, and worrying prospects, and achieve excellent luminescence performance. Effect

Active Publication Date: 2017-02-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a heavy metal element, the toxicity of Pb cannot be ignored, which will greatly affect the application prospects of Pb-based perovskite quantum dots.
[0005] At present, it is difficult to replace Pb with new non-toxic elements due to high defect concentration or poor stability of the material. Only Sn-based non-toxic perovskite nanocrystals prepared by thermal injection have been tried to a certain extent, but Because of its complex preparation process and quantum yield of only 0.14%, the prospect is worrying; and it is well known that Sn has 2 + and 4 + Two valence states, huge problem with stability

Method used

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  • Preparation method of Bi-based perovskite quantum dot material
  • Preparation method of Bi-based perovskite quantum dot material
  • Preparation method of Bi-based perovskite quantum dot material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A kind of Bi-based perovskite quantum dot, its specific preparation steps are as follows:

[0041] Step 1: Clean the two glass bottles; wash the white glass bottles with deionized water, acetone, isopropanol, and deionized water for ten minutes each, and then dry them with a nitrogen gun;

[0042] Step 2: Mix 0.0112g methylamine bromide (MABr) and 0.0299g bismuth bromide (BiBr 3 ) into glass bottle A, successively add 1mL DMF and 1mL ethyl acetate to bottle A as a mixed solvent for dissolving the reactants, and then add 20uL of n-octylamine as a precursor solution;

[0043] Step 3: Add 5mL of n-octane and 0.625mL of oleic acid to glass bottle B as anti-solvent;

[0044] Step 4: Quickly inject 0.5mL precursor solution into the anti-solvent, stir and react for one minute, then immerse the glass bottle B in cold water for rapid cooling;

[0045] Step 5: Take out the suspension in the glass bottle B, centrifuge it at 8000rpm and take the supernatant to obtain a pale yello...

Embodiment 2

[0047] A kind of Bi-based perovskite quantum dot, its specific preparation steps are as follows:

[0048] Step 1: Clean the two glass bottles; wash the white glass bottles with deionized water, acetone, isopropanol, and deionized water for ten minutes each, and then dry them with a nitrogen gun;

[0049] Step 2: Mix 0.0112g methylamine bromide (MABr) and 0.06g bismuth bromide (BiBr 3 ) into glass bottle A, successively add 1mL DMF and 1mL ethyl acetate to bottle A as a mixed solvent for dissolving the reactants, and then add 20uL of n-octylamine as a precursor solution;

[0050] Step 3: Add 5mL of n-octane and 0.5mL of oleic acid to glass bottle B as anti-solvent;

[0051] Step 4: Quickly inject 0.5mL precursor solution into the anti-solvent, stir and react for one minute, then immerse the glass bottle B in cold water for rapid cooling;

[0052] Step 5: Take out the suspension in the glass bottle B, centrifuge it at 8000rpm and take the supernatant to obtain a pale yellow Bi...

Embodiment 3

[0054] A kind of Bi-based perovskite quantum dot, its specific preparation steps are as follows:

[0055] Step 1: Clean the two glass bottles; wash the white glass bottles with deionized water, acetone, isopropanol, and deionized water for ten minutes each, and then dry them with a nitrogen gun;

[0056] Step 2: Mix 0.0112g methylamine bromide (MABr) and 0.015g bismuth bromide (BiBr 3 ) into glass bottle A, successively add 1mL DMF and 1mL ethyl acetate to bottle A as a mixed solvent for dissolving the reactants, and then add 20uL of n-octylamine as a precursor solution;

[0057] Step 3: Add 5mL of n-octane and 1mL of oleic acid to glass bottle B as anti-solvent;

[0058] Step 4: Quickly inject 0.5mL precursor solution into the anti-solvent, stir and react for one minute, then immerse the glass bottle B in cold water for rapid cooling;

[0059] Step 5: Take out the suspension in the glass bottle B, centrifuge it at 8000rpm and take the supernatant to obtain a pale yellow Bi-ba...

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Abstract

The invention discloses a Bi-based perovskite quantum dot material and a preparation method thereof. The method includes the following steps that a mixed solvent of ethyl acetate and DMF is adopted as a precursor solution for dissolving halogenated methylamine and halogenated bismuth, and amine serves as a ligand; normal octane and oleic acid are adopted as an anti-solvent; the anti-solvent is added into the precursor solution, supernate is taken after centrifuging, and then the quantum dot material with the chemical formula being MA3Bi2X9 is obtained, wherein MA=CH3NH3, and X=halogen element (X=Cl or Br or I). By the utilization of the method, the quantum dot material which is free of pollution and adjustable in emission peak can be prepared, the yield of fluorescent light can be remarkably increased, and the stability can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of preparation of photoelectric materials and thin-film solar cells, and more specifically relates to a Bi-based perovskite quantum dot material and a preparation method thereof. Background technique [0002] Perovskite quantum dots have broad application prospects in the field of quantum dot displays due to their high quantum yield, low cost, and simple preparation methods. Based on the confinement effect of quantum dots on electrons and holes, the radiation recombination efficiency of quantum dots will be better than other materials. Therefore, its fluorescence quantum yield will also be higher than that of bulk materials of the same substance. [0003] Perovskite quantum dots can use halogen elements and size effects to adjust their luminescence properties (mainly luminescence wavelength), so their luminescence spectrum can cover the entire visible light region (400-800nm). Therefore, compared with traditional Cd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06
CPCC09K11/06C09K2211/188
Inventor 唐江冷美英杨颖陈正午
Owner HUAZHONG UNIV OF SCI & TECH
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