A bromide perovskite quantum dot material with high brightness and good monochromaticity and its preparation method

A quantum dot material and monochromatic technology, applied in the field of perovskite quantum dot material and its preparation, can solve the problems of complex reaction steps, long reaction time, dangerous raw materials, etc., and achieve simple and easy operation of the preparation method and convenient supply of raw materials , the effect of easy operation

Active Publication Date: 2018-04-24
SOUTHEAST UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a bromide perovskite quantum dot material with high brightness and good monochromaticity and its preparation method, so as to solve the raw material hazards, complicated reaction steps, and reaction problems in the preparation of perovskite quantum dots in the prior art. long time problem

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  • A bromide perovskite quantum dot material with high brightness and good monochromaticity and its preparation method
  • A bromide perovskite quantum dot material with high brightness and good monochromaticity and its preparation method

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[0029] CH used in this example 3 NH 3 Cl, PbCl 2 , KBr and other raw materials are all analytical reagents, the solvent is dimethylformamide, the ligands are n-octylamine and oleic acid, and the glass instruments used are rinsed with deionized water three times before use and then vacuum-dried.

[0030] Preparation of CH 3 NH 3 PbBr 3 Quantum dots, comprising the steps of:

[0031] 1) Add 1.6mmol of CH 3 NH 3 Cl, 2mmol of PbCl 2 , 20mmol of KBr, 200 μL of n-octylamine, 5ml of oleic acid, and 110ml of dimethylformamide were mixed evenly to obtain a mixed solution;

[0032] 2) Put the mixed solution obtained in step 1 into an ultrasonic cleaning machine and sonicate for 1 hour to obtain the required precursor solution;

[0033] 3) Use a pipette gun to extract 50 μL of the precursor solution obtained in step 2, and drop it into 5 ml of toluene at a rate of 20 to 60 drops / minute to form CH 3 NH 3 PbBr 3 quantum dots.

[0034] As shown in the attached picture, figure ...

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Abstract

The invention discloses a bromide perovskite quantum dot material with high brightness and good monochromaticity and a preparation method thereof; the quantum dot material is a CH3NH3PbBr3 quantum dot material having the light emitting half-peak width of 15-20 nm and the quantum yield of 50-70%. The preparation method comprises the following steps: (1) using bromide ions for replacing chlorine ions in CH3NH3Cl, carrying out a reaction with PbCl2 to generate CH3NH3PbBr3, and preparing a CH3NH3PbBr3 precursor solution; and (2) converting the precursor solution into toluene, and forming the quantum dot material. Flammable and explosive methylamine is not required, the dangerousness is low, a series of complex and time-consuming processes for preparing CH3NH3Br are omitted, the stability of the precursor solution is good and can be used repeatedly, and thus the method is a method suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of quantum dot luminescent materials, and in particular relates to a perovskite quantum dot material and a preparation method thereof. Background technique [0002] Perovskite quantum dots are prepared with cheap raw materials, have the advantages of narrow luminescence peaks and high fluorescence efficiency, and can be widely used in LEDs, solar cells and other fields, so they have become a hot spot in the field of quantum dot luminescent materials. However, in the current method of preparing bromide perovskite quantum dots, it is necessary to use methylamine to synthesize CH 3 NH 3 Br, methylamine is a flammable and explosive dangerous product, and the synthesis process requires a series of complex processes of cooling, pressurization, washing, and drying, and the preparation environment is relatively harsh, which is not conducive to promotion. Therefore, it is particularly important to find a preparation method w...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/665
Inventor 王春雷江晗徐淑宏崔一平
Owner SOUTHEAST UNIV
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