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Synthesis method of low-cadmium quantum dots

A synthesis method and quantum dot technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficult preparation of selenium source, low activity of zinc source, high cadmium content of quantum dots, etc., and achieve the effect of adjustable optical properties

Inactive Publication Date: 2020-07-07
NINGBO DXC NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for synthesizing low-cadmium quantum dots to solve the problems of high cadmium content in quantum dots, low zinc source activity and difficult preparation of selenium sources in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of synthetic method of low-cadmium quantum dots:

[0021] Cadmium oleate is dissolved in 1-octadecene to form A solution for subsequent use, and the molar concentration of cadmium oleate in A solution is 0.1mol / L;

[0022] Zinc diethyldiselenocarbamate is dissolved in oleylamine to form a B solution for subsequent use, and the molar concentration of zinc dialkyldiselenocarbamate in the B solution is 1mol / L;

[0023] Zinc oleate and octyl mercaptan are dissolved in liquid paraffin to form a C solution for subsequent use. The C solution is a shell precursor solution. The molar concentration of zinc oleate in the C solution is 0.5 mol / L, and the molar concentration of octyl mercaptan is 5 mol / L. L;

[0024] Synthesize according to the following steps:

[0025] ①.Heat solution A to 150-250°C (because it is difficult to control the heating temperature, so as long as the temperature is within this range, the temperature fluctuation during the heating process is allow...

Embodiment 2

[0029] A kind of synthetic method of low-cadmium quantum dots:

[0030] Cadmium oleate is dissolved in liquid paraffin to form A solution for subsequent use, and the molar concentration of cadmium oleate in A solution is 0.01mol / L;

[0031] Zinc dipropyl diselenocarbamate is dissolved in oleylamine to form a B solution for subsequent use, and the molar concentration of zinc dialkyl diselenocarbamate in the B solution is 1.5mol / L;

[0032] Dissolve zinc oleate and octyl thiol in 1-octadecene to form a C solution for later use. The C solution is the shell precursor solution. The molar concentration of zinc oleate in the C solution is 0.6mol / L, and the molar concentration of octyl thiol 0.5mol / L;

[0033] Synthesize according to the following steps:

[0034] ①.Heat solution A to 150-250°C (because it is difficult to control the heating temperature, so as long as the temperature is within this range, the temperature fluctuation during the heating process is allowed), then inject...

Embodiment 3

[0038] A kind of synthetic method of low-cadmium quantum dots:

[0039] Cadmium oleate is dissolved in lauryl acrylate to form A solution for subsequent use, and the molar concentration of cadmium oleate in A solution is 0.2mol / L;

[0040] Dioctylzinc diselenocarbamate is dissolved in oleylamine to form a B solution for subsequent use, and the molar concentration of zinc dialkyldiselenocarbamate in the B solution is 0.5mol / L;

[0041] Dissolve zinc oleate and octyl thiol in lauryl acrylate to form a C solution for later use. The C solution is the shell precursor solution. The molar concentration of zinc oleate in the C solution is 0.1mol / L, and the molar concentration of octyl thiol is 1mol / L;

[0042]Synthesize according to the following steps:

[0043] ①.Heat solution A to 150-250°C (because it is difficult to control the heating temperature, so as long as the temperature is within this range, the temperature fluctuation during the heating process is allowed), then inject...

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Abstract

The invention discloses a synthesis method of low-cadmium quantum dots. The method comprises the following steps of dissolving cadmium oleate in a solvent to form a solution A for later use, dissolving zinc dialkyl diseleno carbamate in oleylamine to form a solution B for later use, and dissolving zinc oleate and octyl mercaptan in a solvent to form a solution C for later use. The synthesis process comprises the following steps of (1) heating the solution A to 150-250 DEG C, then injecting the solution B, carrying out heat preservation for reaction, taking out a trace reaction solution througha needle head, and monitoring the wavelength by using an optical fiber spectrometer, (2) after the monitored wavelength reaches the expected wavelength, raising the temperature to 250-300 DEG C, injecting the solution C, and after injection is completed, continuing to carry out a heat preservation reaction for 30-90 minutes to obtain a quantum dot solution, and (3) drying the quantum dot solutionto obtain the quantum dots. The activity of zinc is improved, the core preparation temperature is reduced, a cadmium-free alloy shell structure is formed, the optical performance is adjustable, the quantum dot stability is excellent, and the cadmium content of the quantum dot is relatively low.

Description

technical field [0001] The invention relates to a synthesis method of cadmium-containing quantum dots. Background technique [0002] Quantum dots are currently one of the most advanced luminescent materials, and cadmium selenide quantum dots are the most mature type of quantum dots among several quantum dots. It has the characteristics of good stability, excellent optical performance and low manufacturing cost, and is widely used in liquid crystal display and other fields. Liquid crystal display equipment can obtain a white light source with high color purity by adding a quantum dot film to the backlight module and exciting it with a blue light source. It has reliable performance and low cost, and greatly improves the color gamut and user experience of the liquid crystal display. [0003] Quantum dots containing cadmium have excellent performance, but the biggest difficulty encountered in commercialization is the environmental protection problem caused by the heavy metal ca...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02
CPCC09K11/883C09K11/02
Inventor 罗培栋王群
Owner NINGBO DXC NEW MATERIAL TECH
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