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Method for synthesizing full-spectrum perovskite quantum dots based on anion exchange

An anion, perovskite technology, applied in the preparation of lead compounds, chemical instruments and methods, lead compounds, etc., can solve the problems of poor stability, poor optical and electrical properties of quantum dots, and high cost, and achieve low cost effect

Active Publication Date: 2021-11-23
FUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these ion exchange reagents can realize the full-spectrum emission properties of perovskite quantum dots, the phase separation that may occur after the reaction, including the distortion of the cubic phase and the expansion or contraction of the lattice constant, will lead to changes in the optical and electrical properties of the quantum dots. Poor, especially poor stability, and the use of highly toxic reagents in the ion exchange reaction, the cost has been high, which will inevitably limit its application in the field of optoelectronics

Method used

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  • Method for synthesizing full-spectrum perovskite quantum dots based on anion exchange
  • Method for synthesizing full-spectrum perovskite quantum dots based on anion exchange
  • Method for synthesizing full-spectrum perovskite quantum dots based on anion exchange

Examples

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Embodiment 1

[0041] (1) Take 0.4gCs 2 CO 3 Mix with 1.5mL oleic acid and 20mL octadecene, pass nitrogen into the three-necked flask, heat to 120°C and continue to stir for 1h, then raise the temperature to 160°C, and continue to stir for 20min to obtain a transparent cesium oleate precursor solution. After that take 0.15gPbBr 2 Mix it with 25mL of octadecene, put nitrogen into the three-necked flask and stir for 30min, raise the temperature to 120°C and continue stirring for 30min, at this time, mix 1mL of oleic acid and 2mL of oleylamine and quickly inject it into the reaction flask, and stir for a few seconds to get Clear the solution, then quickly heat up to 180°C, quickly inject 2mL of cesium oleate precursor solution, react for 3 seconds, immediately transfer to ice water to cool down, and purify after the solution temperature drops below 30°C. The purification step is high-speed centrifugation (10000rpm, 8min)-take the precipitate-redisperse-low-speed centrifugation (5000rpm, 8min)...

Embodiment 2

[0045] (1) Take 0.4gCs 2 CO 3 Mix with 1.5mL oleic acid and 20mL octadecene, pass nitrogen into the three-necked flask, heat to 120°C and continue to stir for 1h, then raise the temperature to 160°C, and continue to stir for 20min to obtain a transparent cesium oleate precursor solution. After that take 0.15gPbBr 2 Mix it with 25mL of octadecene, put nitrogen into the three-necked flask and stir for 30min, raise the temperature to 120°C and continue stirring for 30min, at this time, mix 1mL of oleic acid and 2mL of oleylamine and quickly inject it into the reaction flask, and stir for a few seconds to get Clear the solution, then quickly heat up to 180°C, quickly inject 2mL of cesium oleate precursor solution, react for 3 seconds, immediately transfer to ice water to cool down, and purify after the solution temperature drops below 30°C. The purification step is high-speed centrifugation (10000rpm, 8min)-take the precipitate-redisperse-low-speed centrifugation (5000rpm, 8min)...

Embodiment 3

[0049] (1) Take 0.4gCs 2 CO 3 Mix with 1.5mL oleic acid and 20mL octadecene, pass nitrogen into the three-necked flask, heat to 120°C and continue to stir for 1h, then raise the temperature to 160°C, and continue to stir for 20min to obtain a transparent cesium oleate precursor solution. After that take 0.15gPbBr 2 Mix it with 25mL of octadecene, put nitrogen into the three-necked flask and stir for 30min, raise the temperature to 120°C and continue stirring for 30min, at this time, mix 1mL of oleic acid and 2mL of oleylamine and quickly inject it into the reaction flask, and stir for a few seconds to get Clear the solution, then quickly heat up to 180°C, quickly inject 2mL of cesium oleate precursor solution, react for 3 seconds, immediately transfer to ice water to cool down, and purify after the solution temperature drops below 30°C. The purification step is high-speed centrifugation (10000rpm, 8min)-take the precipitate-redisperse-low-speed centrifugation (5000rpm, 8min)...

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Abstract

The invention relates to a method for synthesizing full-spectrum perovskite quantum dots based on anion exchange. The method comprises the following steps: S1, obtaining CsPbBr3 perovskite quantum dot mother liquor; S2, mixing anion exchange resin with the inorganic salt solution of Cl ions and the inorganic salt solution of I ions, and obtaining Cl type anion exchange resin and I type anion exchange resin; and S3, mixing the CsPbBr3 perovskite quantum dot mother liquor with Cl type anion exchange resin and I type anion exchange resin according to a preset proportion, and carrying out purification treatment to obtain CsPbBrxCl3-x capable of realizing conversion from a green spectrum to a near-purple spectrum and CsPbBrxI3-x capable of realizing conversion from the green spectrum to a red spectrum. According to the invention, anion exchange resin is used as a medium of perovskite quantum dot anion exchange, and nanoscale accurate regulation and control of a fluorescence emission spectrum are realized in a full spectrum range (400-700nm) on the premise that non-luminous impurities are not introduced.

Description

technical field [0001] The invention relates to the field of preparation of perovskite quantum dots, in particular to a method for synthesizing full-spectrum perovskite quantum dots based on anion exchange. Background technique [0002] Perovskite quantum dots have attracted much attention because of their high light absorption coefficient, narrow half-width of emission spectrum, high photoluminescence quantum yield, adjustable composition and size, adjustable emission spectrum, and photoluminescence and electroluminescence. , is currently one of the most potential optoelectronic materials, widely used in light-emitting diodes, solar cells, photodetectors, lasers and other fields. However, unlike traditional semiconductor quantum dot materials, perovskite quantum dots do not have a particularly obvious quantum confinement effect, so the method of adjusting the spectrum of perovskite quantum dots by adjusting the grain size has obvious limitations. However, perovskite quantu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C01G21/00
CPCC09K11/665C01G21/006C01G21/003C01P2002/01
Inventor 陈恩果王晨辉蔡俊虎徐胜叶芸张永爱郭太良
Owner FUZHOU UNIV