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Preparation method for synthesis of silica-coated inorganic perovskite quantum dots

A technology for synthesizing silicon dioxide and silicon dioxide, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of limited application and great influence of material properties, and achieves short preparation time, high luminous efficiency, and easy operation. simple effect

Inactive Publication Date: 2018-11-02
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Coating with mesoporous materials is a relatively common method, but the coating of mesoporous materials has a great influence on the properties of the material itself, and its application is limited

Method used

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  • Preparation method for synthesis of silica-coated inorganic perovskite quantum dots
  • Preparation method for synthesis of silica-coated inorganic perovskite quantum dots
  • Preparation method for synthesis of silica-coated inorganic perovskite quantum dots

Examples

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Embodiment 1

[0039] Embodiment 1: A kind of silica coated inorganic CsPbBr 3 The preparation method of quantum dots, its preparation process sees attached figure 1 ,Proceed as follows:

[0040] 1) Silanization treatment of quantum dots:

[0041] 1nmol CsPbBr 3 Dispersion of quantum dots In 2ml of n-hexane, add 8μl of tetramethoxysilane, stir for 24 hours, the reaction temperature is 25°C, and react in a sealed environment to obtain silica-modified CsPbBr 3 A solution of quantum dots. Other types of quantum dots (CsPbCl 3 , CsPbI 3 ,CsSnBr 3 , CsSnCl 3 , CsSnI 3 Quantum dots) silanization treatment, all using tetramethoxysilane.

[0042] 2), preparation of silica-coated perovskite quantum dots:

[0043] In silanized CsPbBr 3 Add 0.2 μl of 3-aminopropyltrimethoxysilane to the quantum dot solution, and stir the mixed solution for 1 hour in a sealed state. Quantum dots appear to agglomerate. After centrifugal precipitation and ethanol cleaning, the precipitate is dispersed in ethano...

Embodiment 2

[0044] Example 2: Silica-coated inorganic CsPbBr 3-x Cl x The preparation method of quantum dots, the steps are as follows:

[0045] Similar to Example 1, 1nmol CsPbBr 3-x Cl x Quantum dots were dispersed in 2ml of n-hexane, 5μl of tetramethoxysilane was added, stirred for 24 hours, the reaction temperature was 25°C, and reacted in a sealed environment to obtain silica-modified CsPbBr 3-x Cl x A solution of quantum dots. Then add 0.2 μl of 3-aminopropyltrimethoxysilane, and in a sealed state, stir the mixed solution for 1 hour, the quantum dots appear to agglomerate, after centrifugal precipitation and ethanol cleaning, the precipitate is dispersed in ethanol to obtain silica Coated CsPbBr 3 quantum dots. Silica-coated CsPbBr 3 The absorption fluorescence spectrum of quantum dots is attached Image 6 shown.

Embodiment 3

[0046] Example 3: Silica-coated inorganic CsPbBr 3-x I x The preparation method of quantum dots, the steps are as follows

[0047] Similar to Example 1, 1nmol CsPbBr 3-x I x Quantum dots were dispersed in 2ml of n-hexane, 8μl of tetramethoxysilane was added, stirred for 24 hours, the reaction temperature was 25°C, and reacted in a sealed environment to obtain silica-modified CsPbBr 3- x I x A solution of quantum dots. Then add 0.2 μl of 3-aminopropyltrimethoxysilane, and in a sealed state, stir the mixed solution for 1 hour, the quantum dots appear to agglomerate, after centrifugal precipitation and ethanol cleaning, the precipitate is dispersed in ethanol to obtain silica Coated CsPbBr 3 quantum dots. Silica-coated CsPbBr 3 The absorption fluorescence spectrum of quantum dots is attached Image 6 shown.

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Abstract

The invention provides a preparation method for synthesis of silica-coated inorganic perovskite quantum dots. The method comprises steps as follows: a certain quantity of quantum dot solutions (dissolved in n-hexane) are added to a three-neck flask, a trace of tetramethoxysilane is added, the mixture is put in a glove box and stirred at a certain temperature for 12-24 h, and silanized quantum dotsare obtained; the silanized quantum dots are put in an n-hexane solution reagent bottle, a certain amount of 3-aminopropyl trimethoxysilane is added, sealing is performed, the mixture is stirred at acertain temperature for 0.5-1 h, tetramethoxysilane is added, the mixture is stirred for 0.5-2 h, precipitates appear in a solution, a quantum dot solution is centrifugally separated, and the silica-coated inorganic perovskite quantum dots are obtained after cleaning. The method is simple to operate, low in reaction temperature, shorter in preparation time and high in repeatability. The preparedsilica-coated inorganic perovskite quantum dots have high light emitting efficiency, are more uniform in coating, have uniform particle sizes and are complete in coating.

Description

technical field [0001] The invention belongs to the field of conductor quantum dot luminescent material and nanometer material science and technology, in particular to a preparation method for synthesizing silicon dioxide-coated inorganic perovskite quantum dots. Background technique [0002] All-inorganic perovskite quantum dots CsPbX 3 Because of its excellent performance in optoelectronics, photovoltaics, etc., the application in the fields of solar cells, LEDs, and displays has attracted great interest from researchers. At present, using solar cells prepared with perovskite quantum dots, the energy conversion efficiency has reached more than 20%. LED devices based on perovskite quantum dots have also been developed, however, whether organic-inorganic hybrid perovskite quantum dots CH 3 NH 3 wxya 3 , or all-inorganic perovskite quantum dots CsPbX 3 , have very poor stability. When encountering water, the perovskite structure will be destroyed and the quantum dots wil...

Claims

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Application Information

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IPC IPC(8): C09K11/02
CPCC09K11/025
Inventor 董鹏辉李春亮
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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