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Method for preparing efficient and stable inorganic perovskite quantum dots by using double-layer ligand

An inorganic calcium and stability technology, applied in the field of high-efficiency and stable inorganic perovskite quantum dots prepared by double-layer ligands, can solve the problems affecting the crystallinity of quantum dots, the phase transformation of perovskite quantum dots, etc., and achieve high quantum efficiency and stability, maintaining quantum efficiency and stability, and improving water resistance

Active Publication Date: 2021-01-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This strategy requires the introduction of too much 4-dodecylbenzenesulfonic acid to dissolve inorganic salts, and it has strong acidity, which affects the crystallinity of quantum dots and may cause problems such as phase inversion of perovskite quantum dots.

Method used

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  • Method for preparing efficient and stable inorganic perovskite quantum dots by using double-layer ligand
  • Method for preparing efficient and stable inorganic perovskite quantum dots by using double-layer ligand
  • Method for preparing efficient and stable inorganic perovskite quantum dots by using double-layer ligand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Prepare cesium 4-dodecylbenzenesulfonate solution. Weigh 0.36g of cesium carbonate, 0.4mmoL of 4-dodecylbenzenesulfonic acid and 15mL of octadecene into a 100mL three-necked flask in sequence, heat and stir to 120°C after exhausting, and cool down to 120°C after the reaction is complete. 75° C. to obtain a precursor solution of cesium 4-dodecylbenzenesulfonate.

[0030] (2) Weigh 0.1g of lead bromide, 80mg of didodecyldimethylammonium bromide, 0.35ml of oleylamine, 7mL of octadecene, 4mL of tert-butylbenzene and 0.07mmoL of 4- Cesium dodecylbenzenesulfonate was sequentially added into the hydrothermal reaction kettle, stirred and heated to 150° C., continued to react for 30 minutes, and cooled rapidly to obtain an inorganic perovskite quantum dot solution.

[0031] (3) Add 30-50 mL of ethyl acetate to the perovskite quantum dot solution prepared in step 2 for purification, collect the precipitate by centrifugation at a speed of 7000-9000 r / min, disperse it in tolue...

Embodiment 2

[0051] (1) Preparation of cesium 4-dodecylbenzenesulfonate precursor solution. Process is with embodiment 1.

[0052] (2) Weigh 0.1g of lead bromide, 80mg of didodecyldimethylammonium bromide, 0.3ml of undecylamine, 7mL of octadecene, 4mL of tert-butylbenzene and 0.075mmoL of 4 - Add cesium dodecylbenzenesulfonate into the hydrothermal reaction kettle in sequence, stir and heat to 150° C., continue the reaction for 30 minutes, and rapidly lower the temperature to obtain inorganic perovskite quantum dots.

[0053] (3) Add 30-50 mL of ethyl acetate to the perovskite quantum dot solution prepared in step 2 for purification, collect the precipitate by centrifugation at a speed of 7000-9000 r / min, disperse it in toluene solution, and then / min centrifuge to collect the toluene solution of inorganic perovskite quantum dots. The secondary quantum dots were purified according to the volume ratio of toluene to ethyl acetate as 1:3, and the obtained precipitate was dispersed in hexane...

Embodiment 3

[0055] (1) Preparation of cesium 4-dodecylbenzenesulfonate precursor solution. Process is with embodiment 1.

[0056] (2) Weigh 0.1g of lead bromide, 80mg of didodecyldimethylammonium bromide, 0.3ml of octylamine, 7mL of octadecene, 4mL of tert-butylbenzene and 0.075mmoL of 4- Add cesium dodecylbenzenesulfonate into the hydrothermal reaction kettle in turn, stir and heat to 150°C, continue to react for 30min, and rapidly cool down to obtain an inorganic perovskite quantum dot solution;

[0057] (3) Add 30-50 mL of ethyl acetate to the perovskite quantum dot solution prepared in step 2 for purification, collect the precipitate by centrifugation at a speed of 7000-9000 r / min, disperse it in toluene solution, and then / min centrifuge to collect the hexane solution of inorganic perovskite quantum dots. The secondary quantum dots were purified according to the volume ratio of toluene to ethyl acetate as 1:3, and the obtained precipitate was dispersed in hexane, and a highly stabl...

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Abstract

The invention discloses a method for preparing efficient and stable inorganic perovskite quantum dots by using a double-layer ligand. The method comprises the following steps of: adding lead halide, didodecyl dimethyl ammonium bromide, organic amine, octadecene, tert-butylbenzene and cesium 4-dodecylbenzene sulfonate into a hydrothermal reaction kettle under high temperature and high pressure, carrying out hydrothermal reaction to obtain an inorganic perovskite quantum dot solution, adding ethyl acetate into the perovskite quantum dot solution, performing purifying, conducting centrifuging toremove the supernatant, and dispersing the precipitate in methylbenzene, and collecting a methylbenzene solution of the perovskite quantum dots to obtain a high-stability inorganic perovskite quantumdot methylbenzene solution. According to the invention, a double-shell layer is formed on the surface of the perovskite nanocrystal to serve as a protective layer by utilizing a double-ligand synergistic effect, so that the storage and humidity stability of the perovskite nanocrystal can be improved, and the prepared perovskite quantum dots are high in quantum efficiency, high in stability and suitable for the field of nuclear batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic semiconductor luminescent materials, and relates to a method for preparing high-efficiency and stable inorganic perovskite quantum dots with double-layer ligands. Background technique [0002] All-inorganic perovskite nanocrystals (APbX 3 ) has the advantages of narrow emission, high quantum efficiency, and high carrier mobility, and has broad application prospects in the fields of high-definition flexible displays and solar cells. However, the ligands on the surface of perovskite nanocrystals are in a highly dynamic binding state, which is easy to cause a large number of ligands to be missing during the process of separation and purification, resulting in a decrease in quantum efficiency and stability. In addition, the ionic crystal properties of perovskite materials make them very sensitive to polar solvents, which seriously restrict the practical application of perovskite nano...

Claims

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Application Information

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IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00
Inventor 杨丹丹耿冬苓李晓明曾海波
Owner NANJING UNIV OF SCI & TECH
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