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Method for preparing organic-inorganic hybrid perovskite CH3NH3PbBr3 quantum dot with high brightness stability

A technology of ch3nh3pbbr3 and quantum dots, applied in the field of quantum dots, achieves the effects of good repeatability, simple process, and easy control of preparation parameters

Active Publication Date: 2018-10-16
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, this in situ introduction of thiocyanate groups to prepare CH 3 NH 3 PbBr 3 Quantum dot method, there is no relevant literature and patent reports at home and abroad

Method used

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  • Method for preparing organic-inorganic hybrid perovskite CH3NH3PbBr3 quantum dot with high brightness stability
  • Method for preparing organic-inorganic hybrid perovskite CH3NH3PbBr3 quantum dot with high brightness stability
  • Method for preparing organic-inorganic hybrid perovskite CH3NH3PbBr3 quantum dot with high brightness stability

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Under the protection of nitrogen, add 0.0517g (0.16mmol) lead thiocyanate, 0.0538g (0.48mmol) methyl ammonium bromide and 4mL N,N-dimethylformamide into a 20mL glass bottle, and continuously stir for 5- 10min. After filtration, the filtrate was taken as the precursor solution for later use. Take 1 mL of the precursor solution, add 20 μL of oleylamine and 0.5 mL of oleic acid, stir evenly, quickly inject into 10 mL of 60°C toluene, and stir for 10 min. Centrifuge at 8000rpm for 10-15min, take the supernatant to obtain CH 3 NH 3 PbBr 3 quantum dots. Figure 1-4 respectively for the prepared CH 3 NH 3 PbBr 3 UV-Vis absorption spectrum, fluorescence spectrum, X-ray diffraction spectrum and Fourier transform infrared absorption spectrum of quantum dots. It can be seen from the figure that the prepared CH 3 NH 3 PbBr 3 The luminescence peak of the quantum dot is located at 525 nanometers, has a cubic crystal structure, an average particle diameter of 5.25 nanometer...

Embodiment 2

[0025] Under the protection of nitrogen, add 0.0587g (0.16mmol) lead bromide, 0.0179g (0.16mmol) methyl ammonium bromide and 4mL N,N-dimethylformamide into a 20mL glass bottle, and continuously stir for 5-10min . After filtration, the filtrate was taken as solution A for later use.

[0026] Under the protection of nitrogen, add 0.0517g (0.16mmol) lead thiocyanate, 0.0538g (0.48mmol) methyl ammonium bromide and 4mL N,N-dimethylformamide into a 20mL glass bottle, and continuously stir for 5- 10min. After filtration, the filtrate was taken as solution B for later use.

[0027] Take 0.4mL of solution A and 0.6mL of solution B, add 20μL of oleylamine and 0.5mL of oleic acid, stir evenly, quickly inject into 10mL of 60°C toluene, and stir for 10min. Centrifuge at 8000rpm, take the supernatant, ie CH 3 NH 3 PbBr 3 Quantum dot solution. Figure 5 For CH prepared in Example 2 3 NH 3 PbBr 3 Transmission electron micrograph of quantum dots. Figure 6 For CH prepared in Example...

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Abstract

The invention provides a method for preparing a CH3NH3PbBr3 quantum dot with high fluorescence quantum yield rate and stability by introducing thiocyanate groups in situ. The method is characterized in that in the process of preparing the CH3NH3PbBr3 quantum dot by a ligand-assisted precipitation method, the lead thiocyanate with thiocyanate groups is used as a lead source and is introduced into aprecursor solution, so as to prepare the CH3NH3PbBr3 quantum dot. The prepared CH3NH3PbBr3 quantum dot has the advantages of coordinated light emitting, high fluorescent quantum yield rate, better stability in air, and the like.

Description

technical field [0001] The invention belongs to the field of quantum dots, in particular to a method for preparing high-brightness and stable organic-inorganic hybrid perovskite CH 3 NH 3 PbBr 3 method of quantum dots. Background technique [0002] In recent years, organic-inorganic hybrid perovskites (CH 3 NH 3 wxya 3 , X = Cl, Br, I) Nanoparticles have shown great promise in the fields of electroluminescence, lasers, and displays due to their low cost, adjustable wavelength, narrow emission spectrum, high fluorescence quantum yield, and solution processing. potential. At present, researchers have been able to prepare organic-inorganic hybrid perovskite quantum dots with high fluorescence quantum yield and tunable luminescence properties by adopting different preparation methods and optimizing synthesis conditions. However, the stability of organic-inorganic hybrid perovskite quantum dots is a major challenge to realize its commercial application. Due to the low for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/00C07C211/04C09K11/06B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C07C209/00C09K11/06C07C211/04
Inventor 李璠蔡涛王晓峰夏雪峰
Owner NANCHANG UNIV
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