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Preparation method of blue light perovskite quantum dots

A technology of perovskite and quantum dots, applied in the field of quantum dots, can solve the problems of quantum dot stability and luminescence performance that have great influence, complicated operation, and difficult to control.

Pending Publication Date: 2022-05-27
INST OF WENZHOU ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ligand replacement itself is also difficult, that is, factors such as the concentration of the ligand during the ligand replacement process have a great impact on the stability and luminescent properties of quantum dots, and the operation is more complicated and difficult to control, which is not suitable for mass production.

Method used

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  • Preparation method of blue light perovskite quantum dots
  • Preparation method of blue light perovskite quantum dots
  • Preparation method of blue light perovskite quantum dots

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[0019] The present invention provides a preparation method of blue-light perovskite quantum dots. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0020] like figure 1 Shown is a flow chart of a method for preparing blue light perovskite quantum dots of the present invention, wherein the steps include:

[0021] S10, adding lead bromide, tetraoctyl ammonium bromide and double dodecyl dimethyl ammonium chloride into toluene to prepare lead source precursor;

[0022] S20, preparing a monovalent anion precursor containing one or more of cesium, methylamine or formamidine;

[0023] S30, injecting the monovalent anion precursor into the lead source precursor for reaction to obtain blue light perovskite quant...

Embodiment 1

[0038] Prepare the lead source precursor: add 0.3 mmol of lead bromide, 0.6 mmol of tetraoctyl ammonium bromide and 0.3 mmol of didodecyl dimethyl ammonium chloride to 12 mL of toluene, and sonicate for 2 hours.

[0039] Prepare monovalent anion precursors: Dissolve 0.08 mmol of cesium carbonate and 0.02 mmol of formamidine acetate in 395uL and 53uL of n-octanoic acid, respectively, add 20uL of oleic acid in 1 mL of toluene, and sonicate for 5 minutes.

[0040] Synthesis of blue light perovskite quantum dots: The monovalent anion precursor is rapidly injected into the lead source precursor in a stirring state, the timing is started, and the stirring is stopped after 2 minutes of reaction, and the following results are obtained: figure 2 The fluorescence spectrum shown is a blue-light perovskite quantum dot centered at 479 nm. The blue-light perovskite quantum dots were dispersed in n-octane after washing and centrifugation. The quantum dot solution is still clear and stable ...

Embodiment 2

[0042] Prepare the lead source precursor: add 0.3 mmol of lead bromide, 0.15 mmol of tetraoctyl ammonium bromide and 0.3 mmol of didodecyl dimethyl ammonium chloride to 12 mL of toluene, and sonicate for 2 hours.

[0043] Prepare monovalent anion precursors: Dissolve 0.08 mmol of cesium carbonate and 0.02 mmol of formamidine acetate in 395uL and 53uL of n-octanoic acid, respectively, add 20uL of oleic acid in 1 mL of toluene, and sonicate for 5 minutes.

[0044] Synthesis of blue light perovskite quantum dots: The monovalent anion precursor is rapidly injected into the lead source precursor in a stirring state, the timing is started, and the stirring is stopped after 2 minutes of reaction to obtain blue light perovskite quantum dots.

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Abstract

The invention discloses a preparation method of blue light perovskite quantum dots, which comprises the following steps: adding lead bromide, tetraoctyl ammonium bromide and didodecyl dimethyl ammonium chloride into methylbenzene to prepare a lead source precursor; preparing a monovalent anion precursor containing one or more of cesium, methylamine or formamidine; and injecting the monovalent anion precursor into the lead source precursor for reaction to obtain the blue-light perovskite quantum dots. The didodecyl dimethyl ammonium chloride is directly introduced into a quantum dot synthesis stage, the dynamic process of crystal growth is changed, and the blue light perovskite quantum dot which is simple and convenient in preparation method, good in stability, relatively good in luminescence property and suitable for an electroluminescent diode is obtained.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a preparation method of blue light perovskite quantum dots. Background technique [0002] Halogen perovskite quantum dots have a variety of excellent properties, such as direct band gap, high fluorescence quantum efficiency, high emission color purity, tunable emission color, large light absorption coefficient, high carrier mobility, and high defect tolerance. , and convenient synthesis, etc., so halide perovskite quantum dots have great potential in practical applications in optoelectronic devices. [0003] In recent years, green and red halide perovskite quantum dots have received extensive research and rapid development due to their better material stability. Relatively speaking, the development of blue perovskite quantum dots is relatively lagging behind. On the one hand, the environmental stability of blue perovskite quantum dots is poor, that is, the quantum dot solution itsel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/06C09K11/66
CPCC09K11/025C09K11/06C09K11/665Y02B20/00
Inventor 陈芳戴兴良何海平叶志镇
Owner INST OF WENZHOU ZHEJIANG UNIV
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