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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  • Abstract
  • Description
  • Claims
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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 incompl

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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Example Embodiment

[0030] Example 1

[0031] A toluene precursor solution of 374 mg / mL tetraoctyl ammonium bromide was prepared. Weigh 59.3 mg of cesium carbonate, 206 mg of lead acetate, 10 mL of octadecene, and 1.2045 g of 1,4-dodecylbenzene sulfonic acid solution, and add them to a 100 mL three-necked flask. Place the three-necked flask in the heating mantle. Add argon to degas, 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 the temperature was then lowered to 85°C until the reaction temperature stabilized. The tetraoctylammonium bromide precursor solution is quickly injected into the light brown precursor solution, and the reaction is carried out for 4-10 seconds in an ice bath immediately, vigorously stirred, and the temperature is rapidly cooled to obtain an inorganic halogen perovskite quantum dot solution. Add 30-50mL of ethyl acetate to the quantum dot solution...

Example Embodiment

[0032] Example 2

[0033] Prepare 374mg / mL tetraoctylammonium bromide precursor solution. Weigh 59.3mg of cesium carbonate, 206mg of lead acetate, 10mL of octadecene and 1.2045g of 1,4-dodecylbenzenesulfonic acid solution into a 100mL three-necked flask, put the three-necked flask into a heating mantle, and pass argon Degas, stir and heat to 120°C. After 30 minutes of reaction, the cesium carbonate and lead acetate are completely dissolved to form a light brown transparent precursor solution, and the reaction temperature is stabilized. The tetraoctylammonium bromide precursor solution is quickly injected into the light brown precursor solution, and the reaction is carried out for 4-10 seconds in an ice bath immediately, vigorously stirred, and the temperature is rapidly cooled to obtain an inorganic halogen perovskite quantum dot solution. Add 30-50mL of ethyl acetate to the quantum dot solution, collect the precipitate by centrifugation at a speed of 7000-9000r / min, disperse i...

Example Embodiment

[0034] Example 3

[0035] Prepare 374mg / mL tetraoctylammonium bromide precursor solution. Weigh 59.3mg of cesium carbonate, 206mg of lead acetate, 10mL of octadecene and 1.2045g of 1,4-dodecylbenzenesulfonic acid solution into a 100mL three-necked flask, put the three-necked flask into a heating mantle, and pass argon Degas, 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 the temperature was raised to 150° C., and the reaction temperature was stabilized. The tetraoctylammonium bromide precursor solution is quickly injected into the light brown precursor solution, and the reaction is carried out for 4-10 seconds in an ice bath immediately, vigorously stirred, and the temperature is rapidly cooled to obtain an inorganic halogen perovskite quantum dot solution. Add 30-50mL of ethyl acetate to the quantum dot solution, collect the precipitate by centrifuga...

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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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