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Method for preparing high-stability perovskite quantum dot film by in-situ crosslinking method

An in-situ cross-linking, perovskite technology, applied in the field of quantum dots, can solve the problems of unfavorable perovskite quantum dots, large specific surface area, low formation energy, etc., and achieve easy control of preparation parameters, good repeatability, and efficient fluorescence. Effect

Active Publication Date: 2022-03-18
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic-inorganic hybrid perovskite quantum dots exhibit poor stability due to their large specific surface area, low formation energy, and high ionicity, which are highly susceptible to environmental factors such as oxygen, water, light, and heat. This problem is very unfavorable for the practical application of perovskite quantum dots

Method used

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  • Method for preparing high-stability perovskite quantum dot film by in-situ crosslinking method
  • Method for preparing high-stability perovskite quantum dot film by in-situ crosslinking method
  • Method for preparing high-stability perovskite quantum dot film by in-situ crosslinking method

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Experimental program
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Embodiment 1

[0032] Lead methacrylate (Pb(MMA) 2 ) was dissolved in methyl methacrylate (MMA) at a concentration of 9×10 - 5 Add 1 mL of mol / mL lead methacrylate in methyl methacrylate solution, then add 0.028 g of azoisobutyronitrile, sonicate the prepared solution for 2-3 minutes, and then filter. Heat the filtered solution on a hot stage, the heating temperature is 100 °C, and the heating time is 10~15min. The heated solution was spin-coated to form a film at a speed of 3500 r / min for 30 s and a drop volume of 60 μL. Then in the state of spin coating (3500 r / min, time 30 s), 10×10 -5 A mol / mL solution of methylamine bromide in isopropanol was dropped onto the film. Place the prepared film on a hot stage and heat it at 100 °C for 30 min to prepare MAPbBr 3 / PMMA hybrid film. Figure 1-3 The prepared MAPbBr 3 Photographs, fluorescence spectra and thermal stability of PMMA / PMMA hybrid films under UV light. It can be seen from the figure that the prepared MAPbBr 3 MAPbBr in / PMMA h...

Embodiment 2

[0034] Lead methacrylate (Pb(MMA) 2 ) was dissolved in methyl methacrylate (MMA) at a concentration of 4.5×10 - 5 Add 1 mL of mol / mL lead methacrylate in methyl methacrylate solution, then add 0.028 g of azoisobutyronitrile, sonicate the prepared solution for 2-3 minutes, and then filter. Heat the filtered solution on a hot stage, the heating temperature is 100 °C, and the heating time is 10~15min. The heated solution was spin-coated to form a film at a speed of 3500 r / min for 30 s and a drop volume of 60 μL. Then in the state of spin coating (3500 r / min, time 30 s), 10×10 -5 A mol / mL solution of formamidine bromide in isopropanol was dropped onto the film. Place the prepared film on a hot stage and heat it at 100 °C for 30 min to prepare FAPbBr 3 / PMMA hybrid film. Figure 4-6 Respectively for the prepared FAPbBr 3 Photo, fluorescence spectrum, and X-ray diffraction pattern of the / PMMA hybrid film under ultraviolet light. As can be seen from the figure, the prepared ...

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Abstract

The invention discloses a method for preparing a high-stability perovskite quantum dot film by an in-situ crosslinking method. The method comprises the following steps: S1, preparing a lead-containing precursor solution; S2, preparing an isopropanol solution of halogenated methylamine, halogenated formamidine and halogenated cesium; S3, preparing a lead-containing polymer film; according to the method provided by the invention, the perovskite quantum dot / polymer hybrid film with high brightness and high stability can be prepared in an atmospheric environment.

Description

technical field [0001] The invention belongs to the field of quantum dots, and in particular relates to an in-situ cross-linking growth method for preparing a perovskite quantum dot / polymer hybrid thin film with high brightness and high stability. Background technique [0002] In recent years, organic-inorganic hybrid perovskites (CH 3 NH 3 wxya 3 , X = Cl, Br, I) Quantum dots have attracted widespread attention due to their excellent properties such as easy synthesis, high quantum efficiency, narrow emission wavelength, adjustable band gap, and low preparation cost. They have been widely used in light-emitting diodes, solar cells, photoelectric Detectors, lasers, etc. show great potential. However, organic-inorganic hybrid perovskite quantum dots exhibit poor stability due to their large specific surface area, low formation energy, and high ionicity, which are highly susceptible to environmental factors such as oxygen, water, light, and heat. This problem is very unfavo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/02
CPCC09K11/025C09K11/664
Inventor 李璠郭威王晓峰夏雪峰徐翼飞徐光勇李样生
Owner NANCHANG UNIV
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