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Method for synthesizing highly effective and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands

A technology of perovskite and quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, luminescent materials, etc., can solve problems such as the reduction of quantum efficiency of perovskite quantum dots, and maintain quantum efficiency and stability, the synthesis method is simple and efficient, and the effect of eliminating energy level defects

Active Publication Date: 2019-08-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, most of the oleic acid ligands are adsorbed on the surface of the quantum dots, forming a large number of incomplete PbBr octahedrons, resulting in bromine vacancies, which will lead to a decrease in the quantum efficiency of the perovskite QDs.

Method used

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  • Method for synthesizing highly effective and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands
  • Method for synthesizing highly effective and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands
  • Method for synthesizing highly effective and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands

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Experimental program
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Embodiment 1

[0031] Prepare a 374 mg / mL tetraoctylammonium bromide precursor solution in toluene. Weigh 59.3 mg of cesium carbonate, 206 mg of lead acetate, 10 mL of octadecene, and 1.2045 g of 1,4-dodecylbenzenesulfonic acid solution, add them to a 100 mL three-necked flask, put the three-necked flask into a heating mantle, and Inject argon for degassing, stir and heat to 120°C. After 30 minutes of reaction, the cesium carbonate and lead acetate were completely dissolved to form a light brown transparent precursor solution, and then the temperature was lowered to 85°C until the reaction temperature was stabilized. Rapidly inject the tetraoctylammonium bromide precursor solution into the light brown precursor solution, react in an ice bath for 4-10 seconds, and stir vigorously to cool down rapidly to obtain an inorganic halogen perovskite quantum dot solution. Add 30-50mL of ethyl acetate into the quantum dot solution, collect the precipitate by centrifugation at a speed of 7000-9000r / min...

Embodiment 2

[0033] Prepare 374mg / mL tetraoctylammonium bromide precursor solution. Weigh 59.3 mg of cesium carbonate, 206 mg of lead acetate, 10 mL of octadecene and 1.2045 g of 1,4-dodecylbenzenesulfonic acid solution into a 100 mL three-necked flask, put the three-necked flask into a heating mantle, and introduce argon Degassed, stirred and heated to 120°C. After reacting for 30 minutes, the cesium carbonate and lead acetate were completely dissolved to form a light brown transparent precursor solution, and the reaction temperature was stabilized. Rapidly inject the tetraoctylammonium bromide precursor solution into the light brown precursor solution, react in an ice bath for 4-10 seconds, and stir vigorously to cool down rapidly to obtain an inorganic halogen perovskite quantum dot solution. Add 30-50mL of ethyl acetate into the quantum dot solution, collect the precipitate by centrifugation at a speed of 7000-9000r / min, disperse in 3mL of toluene solution, and then centrifuge at a sp...

Embodiment 3

[0035] Prepare 374mg / mL tetraoctylammonium bromide precursor solution. Weigh 59.3 mg of cesium carbonate, 206 mg of lead acetate, 10 mL of octadecene and 1.2045 g of 1,4-dodecylbenzenesulfonic acid solution into a 100 mL three-necked flask, put the three-necked flask into a heating mantle, and introduce argon Degassed, stirred and heated to 120°C. After reacting for 30 minutes, the cesium carbonate and lead acetate were completely dissolved to form a light brown transparent precursor solution, and then the temperature was raised to 150°C until the reaction temperature was stabilized. Rapidly inject the tetraoctylammonium bromide precursor solution into the light brown precursor solution, react in an ice bath for 4-10 seconds, and stir vigorously to cool down rapidly to obtain an inorganic halogen perovskite quantum dot solution. Add 30-50mL of ethyl acetate into the quantum dot solution, collect the precipitate by centrifugation at a speed of 7000-9000r / min, disperse in 3mL o...

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Abstract

The invention discloses a method for synthesizing highly effective and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands, belonging to the technical field of preparing inorganic semiconductor luminescent materials. The method comprises the following steps: preparing tetra-n-octyl ammonium bromide precursor solution; stirring and heating cesium carbonate, leadacetate, octadecene and 1,4-dodecylbenzene sulfonic acid to react to form a transparent precursor solution under inert gas conditions; quickly adding the tetra-n-octyl ammonium bromide precursor solution into the transparent precursor solution for reaction to obtain a quantum dot solution; adding ethyl acetate to the quantum dot solution for purification, and dispersing the precipitate after centrifugation in toluene solution. The colloidal perovskite quantum dots are obtained by mixing toluene solution of PMMA and quantum dot solution. The quantum dots are coated onto the cleaned glass substrate to form a film. The inorganic halogen perovskite quantum dot prepared by the invention can still maintain high quantum efficiency and stability after being purified for many times.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic semiconductor luminescent materials, and in particular relates to a method for synthesizing an efficient and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands. Background technique [0002] All-inorganic halogen perovskite quantum dots (CsPbX 3 , X=Cl, Br, I) Due to its high quantum efficiency, narrow emission, high carrier mobility and wide color gamut, it has great potential in the fields of light-emitting diodes, lasers, photodetectors, solar cells, etc. Wide range of applications. However, all-inorganic perovskite quantum dots are an ionic crystal material, and the binding of ligands on the surface of quantum dots is a highly dynamic process, which is easy to cause the loss of ligands during the separation and purification process, resulting in luminous efficiency and stability. decline. Therefore, the development of a method for synth...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00
CPCC09K11/025C09K11/665B82Y20/00B82Y30/00
Inventor 李晓明杨丹丹孟翠芳
Owner NANJING UNIV OF SCI & TECH
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