Ultrasonic-based quick manganese-doped perovskite quantum dot preparation method

A technology of perovskite and quantum dots, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of difficult and rapid cation exchange, prolong the synthesis cycle of fiercely doped perovskite, and achieve low raw material prices , Easy to promote, high fluorescence intensity effect

Inactive Publication Date: 2018-11-02
SOUTHEAST UNIV
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Problems solved by technology

Currently reported halogen ion exchange-driven cation exchange can induce MnCl 2 Molecular diffusion into the lattice of perovskite to achieve Pb 2+ with heterogeneous Mn 2+ ion exchange, however due to the PbX 6 4- Strict octahedral structure, the process of cation exchange is still difficult to complete as quickly as halogen ion exchange, so that the synthesis cycle of manganese-doped perovskite is greatly extended

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  • Ultrasonic-based quick manganese-doped perovskite quantum dot preparation method
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  • Ultrasonic-based quick manganese-doped perovskite quantum dot preparation method

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Embodiment 1

[0022] Conventional preparation of Mn:CsPb(Br / Cl) 3 Quantum dots, comprising the steps of:

[0023] 1) Add 1 mmol PbBr 2 , 1 mmol Cs(AC) and 1 mmol MnCl 2 4H 2 Dissolve O in 1ml N, N-dimethylformamide (DMF) and ultrasonically dissolve it completely to make the required precursor solution;

[0024] 2) After mixing 6 ml of oleic acid, 0.8 ml of n-octylamine and 30 ml of n-hexane, add the PbBr obtained in step 1) dropwise in sequence 2 , Cs(AC) precursor solution, stirred for 8-10 minutes, the solution changed from clear to white emulsion, and CsPbBr was prepared 3 Quantum dot materials;

[0025] 3) The MnCl obtained in step 1) 2 Precursor solution was added dropwise to CsPbBr at a rate of 20-60 drops / min 3 In the perovskite quantum dot solution, the reaction is complete in 20-30 hours, and a stable Mn:CsPb(Br / Cl) is prepared 3 Perovskite quantum dots.

[0026] figure 1 It is a time-dependent diagram of the fluorescence spectrum during the synthesis of manganese-doped p...

Embodiment 2

[0028] Accelerated Preparation of Mn:CsPb(Br / Cl) 3 Quantum dots, comprising the steps of:

[0029] 1) Add 1 mmol PbBr 2 , 1 mmol Cs(AC) and 1 mmol MnCl 2 4H 2 Dissolve O in 1ml N, N-dimethylformamide (DMF) and ultrasonically dissolve it completely to make the required precursor solution;

[0030] 2) After mixing 6 ml of oleic acid, 0.8 ml of n-octylamine and 30 ml of n-hexane, add the PbBr obtained in step (1) dropwise in sequence 2 , Cs(AC) precursor solution, stirred for 8-10 minutes, the solution changed from clear to white emulsion, and CsPbBr was prepared 3 Quantum dot materials;

[0031] 3) The MnCl obtained in step 1) 2 Precursor solution was added dropwise to CsPbBr at a rate of 20-60 drops / min 3 Perovskite quantum dot solution, and quickly transfer the entire reaction to an ultrasonic instrument, only 15 to 20 minutes Mn:CsPb(Br / Cl) 3 The perovskite quantum dots can be prepared.

[0032] figure 2 In this embodiment, the fluorescence spectrum changes with ti...

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Abstract

The invention discloses an ultrasonic-based quick manganese-doped perovskite quantum dot preparation method. A manganese-doped perovskite quantum dot refers to Mn:CsPb(Br/Cl)3. The preparation methodincludes steps: (1) respectively dissolving PbBr2, Cs(AC) and MnCl2 4H2O into DMF to obtain reactant precursor solution; (2) sequentially dropwise adding the precursor solution of PbBr2 and Cs(AC) inthe step (1) into stirred oleic acid, n-octylamine and n-hexane mixed solution, wherein as reaction time grows, the solution becomes white emulsion, so that the CsPbBr3 perovskite quantum dot is prepared; (3) dropwise adding the MnCl2 precursor solution in the step (1) into the CsPbBr3 perovskite quantum dot solution prepared in the step (2) by a rate of 20-60 drops per minute, wherein the whole reaction is quickly transferred into an ultrasonic apparatus to carry out. The method is simple in preparation process and short in production period, the precursor solution is high in stability and reusable, and suitableness for industrial popularization is realized.

Description

technical field [0001] The invention relates to a method for rapidly preparing manganese-doped perovskite quantum dots based on ultrasound, and belongs to the technical field of rapid preparation of all-inorganic perovskite materials. Background technique [0002] As a new generation of optoelectronic functional materials, all-inorganic perovskites have excellent properties such as ultra-high fluorescence quantum yield, composition-dependent emission wavelengths covering the entire visible light region, and narrow linewidth. They are used in LEDs, lasers, photoelectric conversion and The unlimited potential in the field of photoelectric detection has become a research hotspot in recent years. The use of cation exchange to introduce some functional cations into nanocrystals can endow them with unique optical, electrical, magnetic properties and various morphological structures, and has a very high application prospect in the preparation of nanocrystals. Currently reported ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/665
Inventor 王春雷吴浩徐淑宏崔一平
Owner SOUTHEAST UNIV
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