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Preparation method of high-stability cesium lead iodide quantum dot

A high stability, quantum dot technology, applied in chemical instruments and methods, nanotechnology, nano optics, etc., can solve the failure of iodine lead cesium quantum dots, the thermal instability of inorganic lead halide perovskite nanocrystals, and the complex preparation process. To solve problems such as chemistry, to achieve the effect of good time stability and temperature stability

Inactive Publication Date: 2020-03-17
HUBEI UNIV
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Problems solved by technology

CsPbI used in these applications 3 Inorganic lead halide perovskite nanocrystals are basically prepared by hot injection method, which brings about the problem that CsPbI 3 Inorganic lead halide perovskite nanocrystals are thermally unstable, and the newly prepared α-phase iodine-lead-cesium quantum dots will transform into β-phase in a short time, resulting in the failure of iodine-lead-cesium quantum dots and limiting the performance of iodine-lead-cesium quantum dots. Further effective use
In order to solve its stability problem, it is still a good solution to use stable bromine-lead-cesium quantum dot doping or Mn element doping, but this will complicate the preparation process

Method used

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  • Preparation method of high-stability cesium lead iodide quantum dot
  • Preparation method of high-stability cesium lead iodide quantum dot
  • Preparation method of high-stability cesium lead iodide quantum dot

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preparation example Construction

[0029] The invention provides a preparation method of high-stability iodine-lead-cesium quantum dots, comprising the following steps:

[0030] Add cesium carbonate, octadecene and oleylamine solution to the three-necked flask, continue vacuuming and heat to dissolve to form a cesium source solution;

[0031] Add ammonium iodide, lead oxide, octadecene, oleic acid and oleylamine solution into the three-necked flask, continue vacuuming and heat to dissolve to form iodine source and lead source solution;

[0032] Add the cesium source solution in the iodine source and lead source solution, and quench the reaction in cold water after the reaction to obtain the crude iodine-lead-cesium quantum dot solution;

[0033] Methyl acetate is added to the crude iodine-lead-cesium quantum dot solution, centrifuged to obtain iodine-lead-cesium quantum-dot precipitation, and then dissolved in n-hexane to obtain an iodine-lead-cesium quantum-dot solution.

[0034] In the present invention, ces...

Embodiment 1

[0042] 0.0772g of CsCO 3 Dissolve the powder in 4ml of octadecene and 0.25ml of oleic acid mixture, place it in a heating mantle and stir at 800rpm, use a vacuum pump to connect one end of the three-necked flask to continuously pump air and adjust the heating mantle to heat to 110°C, keep it for 1h, then pass argon Then the temperature was raised to 160°C and reacted for 30 minutes until the powder was dissolved to obtain a light brown solution; then the temperature was lowered to 80°C, and the stirring was continued under argon protection to obtain cesium oleate;

[0043] 0.2574g of NH 4I and 0.1338g of PbO powder are dissolved in 10ml of octadecene, 1.5ml of oleylamine and 1.5ml of oleic acid mixture, placed in a heating mantle and stirred at 800rpm, connected to one end of the three-necked flask with a vacuum pump to continuously pump and adjust the heating Heat the jacket to 110°C, keep it for 1 hour, pass argon gas and then raise the temperature to 160°C, and react for 3...

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Abstract

The invention provides a high-stability cesium lead iodide quantum dot. The high-stability cesium lead iodide quantum dot is prepared by changing the components of a precursor and adopting a thermal injection method. The size of the high-stability cesium lead iodide quantum dot is 7-8 nm, and the high-stability cesium lead iodide quantum dot has a good time stability and a good temperature stability, still keeps a good microstructure in a TEM graph after being stored for one month, and can be widely applied to the fields of solar cells, photoelectric detectors, LEDs and the like.

Description

technical field [0001] The invention relates to the technical field of quantum dot synthesis, in particular to a method for preparing high-stability iodine-lead-cesium quantum dots. Background technique [0002] CaPbI 3 Inorganic lead halide perovskite nanocrystals have been widely used in photodetection, LED, biosensing, solar cells and other fields after years of research and development. CsPbI used in these applications 3 Inorganic lead halide perovskite nanocrystals are basically prepared by hot injection method, which brings about the problem that CsPbI 3 Inorganic lead halide perovskite nanocrystals are thermally unstable, and the newly prepared α-phase iodine-lead-cesium quantum dots will transform into β-phase in a short time, resulting in the failure of iodine-lead-cesium quantum dots and limiting the performance of iodine-lead-cesium quantum dots. further effective use. In order to solve the stability problem, it is still a good solution to use stable bromine-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00
Inventor 李金华王强沈涛王贤保
Owner HUBEI UNIV