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InP quantum dot and preparation method thereof

A technology of quantum dots and ligands, applied in the field of quantum dot preparation, can solve the problems of large half-peak width, difficult control of the nucleation and growth process of InP quantum dots, and difficulty in controlling the emission wavelength of InP quantum dots. Easy-to-control effects

Inactive Publication Date: 2019-01-01
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since the nucleation and growth process of InP quantum dots is difficult to control, the existing pH 3 It is not easy to control the emission wavelength of InP quantum dots in the process of preparing InP quantum dots for phosphorus sources, and the half-peak width is large

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  • InP quantum dot and preparation method thereof

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preparation example Construction

[0023] The present application provides a method for preparing InP quantum dots, including: step S1: at 100-150°C, add PH to the mixed system containing indium precursor, first ligand and first organic solvent 3 , to obtain a nanocrystal nucleus solution; step S2: cooling the nanocrystal nucleus solution in step S1 to 0-60° C., adding a second ligand to obtain a nanocrystal nucleus solution modified by a second ligand; step S3: converting step S2 The temperature of the nano crystal core solution modified by the second ligand is raised to 200-300° C., and the precursor required for the synthesis of the shell layer is added to obtain InP quantum dots with the shell layer.

[0024] As a gaseous material, PH 3 Gases are generally liquefied and compressed in cylinders. In this application, PH 3 The gas can be directly passed into the mixed system in the form of gas, or the pH 3 After the gas is dispersed in an organic solvent, it is added to the mixing system in the form of a ga...

Embodiment 1

[0040] Add 294 mg of indium acetate, 183 mg of zinc acetate, 1 mL of oleic acid, and 20 mL of 1-octadecene into a three-necked flask, and heat to dissolve under a nitrogen atmosphere. The temperature of the solution was raised to 130°C, and the pH 3 Gas reaction for 5 minutes, until the color of the solution is darkened to light yellow, quickly cool down to 20°C, add 0.5mL of n-dodecylmercaptan, keep warm for 10min, quickly heat up to 280°C, then add 1g of zinc stearate to the solution, ( Zinc stearate was dissolved in 5 mL of 1-octadecene), and kept warm for 1 h, then 0.5 mL of n-dodecanethiol was added, kept warm for 2 h, and the heating was stopped. figure 1 It is the ultraviolet-visible absorption and fluorescence emission spectrogram of the sample prepared in embodiment 1, from figure 1 It can be seen that its emission peak is 505nm, its absorption peak is 503nm, and its half-width is less than 60nm.

Embodiment 2

[0042] Add 294mg of indium acetate, 90mg of zinc acetate, 0.8mL of oleic acid and 20mL of 1-octadecene into a three-necked flask, and heat to dissolve under a nitrogen atmosphere. The temperature of the solution was raised to 130°C, and the pH 3 Gas reaction for 20 minutes, when the color of the solution is darkened to light yellow, quickly cool down to 20°C, add 0.5mL of oleylamine, keep it warm for 10min, quickly raise the temperature to 220°C, then add 0.5mL of trioctylphosphine solution of elemental sulfur to the solution (2M), keep warm for 30min, heat up to 240°C, add 2mL of 0.5M 1-octadecene solution of zinc oleate to the solution, keep warm for 30min, heat up to 260°C, add 0.5mL of elemental sulfur to the solution Trioctylphosphine solution (2M), keep warm for 30min, stop heating. figure 2 It is the ultraviolet-visible absorption and fluorescence emission spectrogram of the sample prepared in embodiment 2, from figure 2 It can be seen that its emission peak is 530n...

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Abstract

The invention provides an InP quantum dot and a preparation method thereof. The preparation method of the InP quantum dot comprises the following steps: S1, at the temperature of 100-150 DEG C, addingPH3 into a mixed system which contains an indium precursor, a first ligand and a first organic solvent to obtain nanometer crystal nucleus solution; S2, cooling the nanometer crystal nucleus solutionto 0-60 DEG C, and adding a second ligand to obtain nanometer crystal nucleus solution modified by the second ligand; S3, raising the temperature of the nanometer crystal nucleus solution modified bythe second ligand in the S2 to 200-300 DEG C, adding a precursor required by shell synthesis to obtain the InP quantum dot with the shell. Through the control of the precursor, the temperature, the first ligand, the second ligand and the like, the emission wavelength of the obtained InP quantum dot can be easily controlled, and in addition, the half-peak breadth of the InP quantum dot is smaller.

Description

[0001] divisional application [0002] This application is a divisional application of the Chinese patent application "201610807861.X" entitled "An InP quantum dot and its preparation method" filed on September 07, 2016. technical field [0003] The present application relates to the technical field of preparation of quantum dots, in particular to an InP quantum dot and a preparation method thereof. Background technique [0004] Quantum dots have the advantages of wide excitation wavelength range, narrow half maximum width, large Stokes shift, and strong photostability, so they are widely used in display, biomarkers, solar cells and other fields. Compared with quantum dots of group II-VI elements, quantum dots of group III-V elements represented by InP quantum dots have become a research hotspot and trend because they do not have inherent toxicity. [0005] Since the nucleation and growth process of InP quantum dots is difficult to control, the existing pH 3 It is difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/70C09K11/88C09K11/02B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/02C09K11/025C09K11/70C09K11/88C09K11/883
Inventor 王允军张卫
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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