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Method for Synthesizing Efficient and Stable All-Inorganic Halogen Perovskite Quantum Dot Scintillators with Equivalent Ligands

A perovskite, quantum dot technology, 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 achieve elimination energy Defects, high detection efficiency, and the effect of suppressing non-radiative recombination

Active Publication Date: 2022-05-20
杭州钛光科技有限公司
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  • 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 Efficient and Stable All-Inorganic Halogen Perovskite Quantum Dot Scintillators with Equivalent Ligands
  • Method for Synthesizing Efficient and Stable All-Inorganic Halogen Perovskite Quantum Dot Scintillators with Equivalent Ligands
  • Method for Synthesizing Efficient and Stable All-Inorganic Halogen Perovskite Quantum Dot Scintillators with Equivalent Ligands

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Embodiment 1

[0031] Preparation of 374 mg / mL of tetraoctylammonium bromide precursor solution of toluene. Weigh 59.3mg of cesium carbonate, 206mg of lead acetate, 10mL octadecyl, 1.2045g of 1,4-dodecylbenzenesulfonic acid solution, added to a 100mL three-mouth flask, the three-mouth flask into the heating sleeve, through the argon degassing, stirring and heating 120 ° C. After the reaction for 30min, cesium carbonate and lead acetate were completely dissolved to form a light brown transparent precursor solution, which was then cooled to 85 °C, and the reaction temperature was stable. The tetraoctyl ammonium bromide precursor solution was quickly injected into the light brown precursor solution, and the reaction was immediately ice bathed for 4 to 10 seconds, stirred vigorously to make it cool down rapidly to obtain an inorganic halogen perovskite quantum dot solution. 30~50mL of ethyl acetate was added to the quantum dot solution, centrifuged at a speed of 7000~9000r / min to collect the preci...

Embodiment 2

[0033] Preparation of a tetraoctyl ammonium bromide precursor solution of 374 mg / mL. Weigh 59.3mg of cesium carbonate, 206mg of lead acetate, 10mL octadecyl and 1.2045g of 1,4-dodecylbenzenesulfonic acid solution added to a 100mL three-mouth flask, the three-mouth flask into the heating sleeve, through argon degassing, stirring and heating 120 ° C. After the reaction for 30min, cesium carbonate and lead acetate were completely dissolved to form a light brown transparent precursor solution, and the reaction temperature was stable. The tetraoctyl ammonium bromide precursor solution was quickly injected into the light brown precursor solution, and the reaction was immediately ice bathed for 4 to 10 seconds, stirred vigorously to make it cool down rapidly to obtain an inorganic halogen perovskite quantum dot solution. 30~50mL of ethyl acetate was added to the quantum dot solution, centrifuged at a speed of 7000~9000r / min to collect the precipitation, dispersed in 3mL toluene solution,...

Embodiment 3

[0035] Preparation of a tetraoctyl ammonium bromide precursor solution of 374 mg / mL. Weigh 59.3mg of cesium carbonate, 206mg of lead acetate, 10mL octadecyl and 1.2045g of 1,4-dodecylbenzenesulfonic acid solution added to a 100mL three-mouth flask, the three-mouth flask into the heating sleeve, through argon degassing, stirring and heating 120 ° C. After the reaction for 30 minutes, cesium carbonate and lead acetate were completely dissolved to form a light brown transparent precursor solution, which was then heated to 150 °C until the reaction temperature was stable. The tetraoctyl ammonium bromide precursor solution was quickly injected into the light brown precursor solution, and the reaction was immediately ice bathed for 4 to 10 seconds, stirred vigorously to make it cool down rapidly to obtain an inorganic halogen perovskite quantum dot solution. 30~50mL of ethyl acetate was added to the quantum dot solution, centrifuged at a speed of 7000~9000r / min to collect the precipitatio...

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Abstract

The invention discloses a method for synthesizing an efficient and stable all-inorganic halogen perovskite quantum dot scintillator with equivalent ligands, and belongs to the technical field of preparation of inorganic semiconductor light-emitting materials. The method comprises the steps of: preparing tetraoctylammonium bromide precursor solution; under inert gas conditions, stirring and heating cesium carbonate, lead acetate, octadecene and 1,4-dodecylbenzenesulfonic acid To form a transparent precursor solution; the precursor solution of tetraoctyl ammonium bromide is quickly added to the above-mentioned transparent precursor solution to react to obtain a quantum dot solution; ethyl acetate is added to the quantum dot solution for purification, and the centrifuged The precipitate was dispersed in toluene solution. The toluene solution of PMMA is mixed with the quantum dot solution to obtain colloidal perovskite quantum dots. The quantum dots were dropped onto the cleaned glass substrate to form a film. The inorganic halogen perovskite quantum dots prepared by the invention can still maintain high quantum efficiency and stability after multiple purifications.

Description

Technical field [0001] The present invention belongs to the field of preparation technology for inorganic semiconductor luminescent materials, specifically relates to an equivalent ligand synthesis of efficient and stable all-inorganic halogen perovskite quantum dot scintillator method. Background [0002] All-inorganic halogen perovskite quantum dots (CsPbX 3 X=Cl, Br, I) Due to its high quantum efficiency, narrow emission, high carrier migration rate and wide color gamut, it has a wide range of applications in light-emitting diodes, lasers, photodetectors, solar cells and other fields. However, all-inorganic perovskite quantum dots are ionic crystalline materials, and the binding of ligands on the surface of quantum dots belongs to a highly dynamic process, which is easy to cause the loss of ligands during separation and purification, resulting in a decrease in luminescence efficiency and stability. Therefore, the development of an equivalent ligand synthesis of efficient and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00
CPCC09K11/025C09K11/665B82Y20/00B82Y30/00
Inventor 李晓明杨丹丹孟翠芳
Owner 杭州钛光科技有限公司
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