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Preparation method of perovskite quantum dots

A technology of perovskite and quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, lead compounds, etc., can solve the problems of poor stability and luminous efficiency of perovskite quantum dots, and achieve Guaranteed fluorescence quantum efficiency, good monochromaticity, and obvious coordination effect

Inactive Publication Date: 2017-12-22
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, the stability and luminous efficiency of perovskite quantum dots that can realize the full visible region are poor at present, which limits its application.

Method used

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  • Preparation method of perovskite quantum dots
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  • Preparation method of perovskite quantum dots

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[0025] The invention provides a kind of preparation method of perovskite quantum dot, comprises the following steps:

[0026] A) will Cs 2 CO 3 , oleic acid and octadecene are mixed, and a heating reaction is carried out under protective atmosphere conditions to obtain a cesium oleate precursor solution;

[0027] B) Mix lead halide and octadecene, heat and keep it warm under a protective atmosphere, then add a mixed solution of oleic acid and oleylamine to raise the temperature to 170-190°C, and then mix it with the cesium oleate precursor solution to carry out reaction to obtain perovskite quantum dots, and the lead halide is selected from one or more of lead chloride, lead bromide and lead iodide.

[0028] In the present invention, Cs 2 CO 3 , oleic acid and octadecene are mixed, and the heating reaction is carried out under a protective atmosphere condition to obtain a cesium oleate precursor solution.

[0029] Specifically, the present invention mixes cesium carbonate...

Embodiment 1

[0047] 1. Weigh Cs 2 CO 3 Add 0.326g of powder, 1.27ml of oleic acid, 18.73ml of octadecene into a three-necked bottle, Cs 2 CO 3 The molar ratio with oleic acid is 1:4, Cs 2 CO 3 The molar concentration is 0.05mol / l. Fill with argon while magnetically stirring, deoxygenate for 60 minutes, then heat to 150°C with a heating mantle and keep for 30 minutes until the solution is a colorless and transparent solution, then cool down to room temperature naturally to prepare a cesium oleate precursor solution.

[0048] 2. Weigh PbBr 2 0.0734g was put into a three-necked bottle, and 12ml of octadecene was added. 40°C under argon protection for 30 minutes, slowly warming up to 120°C, stirring for 60 minutes; then adding a mixed solvent of 1.5ml oleylamine and 0.5ml oleic acid, when PbBr 2 After all dissolved, raise the temperature to 180°C, then quickly add 1ml of the cesium oleate precursor solution synthesized in step 1, stir and react for 1 minute, then cool down to room tempe...

Embodiment 2

[0052] 1. Weigh Cs 2 CO 3 Add 0.326g of powder, 1.27ml of oleic acid, 18.73ml of octadecene into a three-necked bottle, Cs 2 CO 3 The molar ratio with oleic acid is 1:4, Cs 2 CO 3 The molar concentration is 0.05mol / l. Fill with argon while magnetically stirring, deoxygenate for 60 minutes, then heat to 160°C with a heating mantle and keep for 20 minutes until the solution is a colorless and transparent solution, then cool down to room temperature naturally to prepare a cesium oleate precursor solution.

[0053] 2. Weigh PbBr 2 0.0734g was put into a three-necked bottle, and 12ml of octadecene was added. 40°C under argon protection for 30 minutes, slowly warming up to 120°C, stirring for 60 minutes; then adding a mixed solvent of 1.5ml oleylamine and 0.5ml oleic acid, when PbBr 2 After all dissolved, raise the temperature to 180°C, then quickly add 1ml of the cesium oleate precursor solution synthesized in step 1, stir and react for 1 minute, then cool down to room tempe...

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Abstract

The invention provides a preparation method of perovskite quantum dots. The preparation method comprises steps as follows: A), Cs2CO3, oleic acid and octadecene are mixed and subjected to a heating reaction under the condition of protective atmosphere, and a cesium oleate precursor solution is obtained; B), lead halide and octadecene are mixed and subjected to heating and heat preservation under the condition of protective atmosphere, after an oleic acid and oleylamine mixed solution is added and heated to 170-190 DEG C, an obtained mixed solution is mixed and reacts with the cesium oleate precursor solution, and the perovskite quantum dots are obtained, wherein the lead halide is selected from one or more of lead chloride, lead bromide and lead iodide. According to the preparation method, the coordination effect of surface ligands of the perovskite quantum dots of different halide ions directly synthesized at a higher temperature is more remarkable, so that stability and fluorescence quantum efficiency of the synthesized perovskite quantum dots are both guaranteed.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a preparation method of perovskite quantum dots. Background technique [0002] In recent years, due to the advantages of quantum dots such as quantum size effect, quantum confinement effect, narrow emission spectrum, and excitation spectrum linewidth, they have shown attractive application prospects in optoelectronic devices, such as making light-emitting diodes, quantum dots, etc. Lasers, biological probes, and optical converters or modulators, etc. Since the report on CdSe quantum dots in "Science" by Nie Shuming et al. in 1998, II-VI, III-V semiconductor nanomaterials (CdSe, CdS, CdTe, ZnSe, InP, GaAs, etc.) have greatly attracted attention. Scholars at home and abroad attach great importance to it, and have also achieved gratifying achievements in the preparation of materials by leaps and bounds. [0003] With the continuous progress of material re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00C09K11/66B82Y30/00B82Y40/00
CPCC01G21/006B82Y30/00B82Y40/00C01P2004/64C09K11/665
Inventor 曾庆辉苏莹
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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