High-efficiency luminescent perovskite quantum dot material and preparation method thereof

A technology of quantum dot materials and perovskite, which is applied in the direction of luminescent materials, chemical instruments and methods, lead compounds, etc., can solve the problem of insufficient application of quantum dots

Active Publication Date: 2019-06-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of perovskite quantum dots in LED has also been preliminarily studied, but the application of quantum dots is not rich enough

Method used

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  • High-efficiency luminescent perovskite quantum dot material and preparation method thereof
  • High-efficiency luminescent perovskite quantum dot material and preparation method thereof
  • High-efficiency luminescent perovskite quantum dot material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A chemical formula is (NH 4 ) 0.5 Cs 0.5 Pb(Br 0.5 I 0.5 ) 3 The preparation method of the perovskite quantum dot, the steps are as follows:

[0029] Step 1: Wash two glass bottles (glass bottle A and glass bottle B); wash the two white glass bottles with deionized water, acetone, isopropanol, and deionized water for ten minutes each, and then blow dry with a nitrogen gun ,spare;

[0030] Step 2: Add 0.1mmol ammonium iodide (NH 4 I), 0.1mmol lead iodide (PbI 2 ), 0.1mmol cesium bromide (CsBr) and 0.1mmol lead bromide (PbBr 2 ) was poured into glass bottle A, and 5mL DMF was successively added to glass bottle A as a solvent for dissolving the reactant, and then 100uL of oleic acid and 50uL of oleylamine were added as the precursor solution;

[0031] Step 3: Add 5mL of toluene to the glass bottle B as the anti-solvent; quickly inject 50uL of the precursor solution into the glass bottle B containing the anti-solvent, and fully stir the reaction;

[0032] Step 4: ...

Embodiment 2

[0035] A chemical formula is (NH 4 ) 0.75 Cs 0.25 Pb(Br 0.5 I 0.5 ) 3 The preparation method of the perovskite quantum dots, the preparation steps are basically the same as in Example 1, the difference is only: Step 2: 0.15mmol ammonium iodide (NH 4 I), 0.075mmol lead iodide (PbI 2 ), 0.05mmol cesium bromide (CsBr) and 0.125mmol lead bromide (PbBr 2 ) into the glass bottle A, successively add 5mL DMF to the glass bottle A as a solvent for dissolving the reactant, then add 100uL of oleic acid and 50uL of oleylamine as the precursor solution. Finally, pale yellow (NH 4 ) 0.75 Cs 0.25 Pb(Br 0.5 I 0.5 ) 3 Colloidal solution of perovskite quantum dots.

Embodiment 3

[0037] A chemical formula is (NH 4 ) 0.875 Cs 0.125 Pb(Br 0.5 I 0.5 ) 3 The preparation method of the perovskite quantum dots, the preparation steps are basically the same as in Example 1, the difference is only: Step 2: 0.175mmol ammonium iodide (NH 4 I), 0.0625mmol lead iodide (PbI 2 ), 0.025mmol cesium bromide (CsBr) and 0.175mmol lead bromide (PbBr 2 ) into the glass bottle A, successively add 5mL DMF to the glass bottle A as a solvent for dissolving the reactant, then add 100uL of oleic acid and 50uL of oleylamine as the precursor solution. Finally, pale yellow (NH 4 ) 0.875 Cs 0.125 Pb(Br 0.5 I 0.5 ) 3 Colloidal solution of perovskite quantum dots.

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Abstract

The invention discloses a preparation method of a high-efficiency luminescent perovskite quantum dot material, comprising the following steps: pouring an appropriate amount of ammonium iodide, lead iodide, cesium bromide and lead bromide into a glass container A, wherein the molar ratio of ammonium to cesium is x: (1-x) (x is less than 1 and greater than 0), and the molar ratio of bromine to iodine is 1:1; then adding a proper amount of DMF as a solvent into the glass container A to fully dissolve the reactant, adding oleic acid and oleylamine as the ligand to obtain a precursor solution; placing a proper amount of methylbenzene as an anti-solvent into a glass container B, adding the precursor solution into the glass container B, fully stirring and reacting; and finally centrifuging and taking a supernatant to obtain the high-efficiency luminescent perovskite quantum dot material with the chemical formula being (NH4)xCs(1-x)Pb(Br0.5I0.5)3. The material is of great significance for theresearch on the properties and luminescence of the novel semiconductor quantum dot material. The invention is a strategy for ion-induced crystal form change for the development of various perovskite materials.

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 single-phase alloy 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 trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00C09K11/66
Inventor 赵广久王朝刘越
Owner TIANJIN UNIV
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