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Preparation method of CdZnSeS quantum dots

A technology of quantum dots and compounds, which is applied in the field of CdZnSeS quantum dots, can solve the problems of inability to synthesize quantum dots with different fluorescence, limited adjustment ability, uncertain subjective and objective factors, etc., so as to reduce the requirements of production equipment and reaction process Continuous, easy-to-use effects

Active Publication Date: 2012-09-19
GUANGDONG POLY OPTOELECTRONICS
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Problems solved by technology

[0003] CdZnSeS quantum dots belong to type II-VI quantum dots, and are the most widely and deeply researched quantum dot systems in the academic circle. Into the reaction system to prepare CdZnSeS quantum dots, these methods are only suitable for the preparation of trace or a small amount of samples for scientific research, but for large-scale industrial production this method has some disadvantages: 1. There are many uncertain subjective and objective factors in the injection process, which is difficult control
5. The injection method can only adjust the emission spectrum of the product through the ratio of the initial materials, and the adjustment ability in the reaction process is extremely limited, and it is impossible to use a unified process to synthesize quantum dots with different fluorescence

Method used

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  • Preparation method of CdZnSeS quantum dots
  • Preparation method of CdZnSeS quantum dots
  • Preparation method of CdZnSeS quantum dots

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Embodiment 1

[0028] The preparation of embodiment 1 cadmium source

[0029] Mix 1 mol of cadmium acetate and 4 mol of oleic acid, vacuumize and fill nitrogen three times repeatedly, react at 260°C for 1 hour, cool to room temperature, add 1-octadecene to make cadmium oleate with a concentration of 0.1 mol / L 1-octadecene solution, spare.

Embodiment 2

[0030] The preparation of embodiment 2 cadmium sources

[0031] Mix 1 mol of cadmium oxide and 2 mol of oleic acid, vacuumize and fill nitrogen three times repeatedly, react at 280°C for 2 hours, cool to room temperature, add 1-octadecene to make cadmium oleate with a concentration of 0.1 mol / L 1-octadecene solution, spare.

Embodiment 3

[0032] The preparation of embodiment 3 zinc sources

[0033] Mix 1 mol of zinc acetate and 2 mol of oleic acid, repeatedly evacuate and fill with nitrogen for 3 times, react at 270°C for 1 hour to obtain zinc oleate, cool to room temperature, and set aside.

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Abstract

The invention relates to a preparation method of CdZnSeS quantum dots. The preparation method comprises the following steps: (1) evenly mixing zinc sources, selenium sources and organic solvent, leading in shielding gas, and heating to 220-290 DEG C; or evenly mixing inorganic zinc compounds, the zinc sources, fatty acid and the organic solvent, leading in the shielding gas, and heating to 220-290 DEG C; (2) slowly adding cadmium sources dropwise, monitoring wavelengths of fluorescence emission peaks of intermediate products in real time, and stopping adding the cadmium sources dropwise when the wavelengths of the fluorescence emission peaks of target products are achieved; (3) slowly adding stoichiometric sulfur sources or mixed liquid of the sulfur sources and the zinc sources dropwise; and (4) reacting for 0.5-24h at 220-290 DEG C to obtain the CdZnSeS quantum dots with different emission wavelengths. The preparation method of the CdZnSeS quantum dots is simple to operate, the reaction process is continuous and stable, a rapid injection method is not required, the requirements for production equipment are lowered, and the reaction temperature is low. Fluorescence emission spectrums of the products can be controlled by adjusting addition amount of the cadmium sources according to real-time monitoring results.

Description

technical field [0001] The invention relates to a method for preparing quantum dots, in particular to a method for preparing CdZnSeS quantum dots with a spectral range of 450-630 nm by adopting a full-drop method Background technique [0002] Quantum dots are also called semiconductor nanocrystals. When stimulated by light or electricity, quantum dots will emit light in a certain wavelength range. The range and intensity of the emission spectrum are determined by the composition, size and shape of quantum dots. This feature enables quantum dots to be used as luminescent materials in biological detection, anti-counterfeiting, LED, display and optoelectronic devices and other fields. [0003] CdZnSeS quantum dots belong to type II-VI quantum dots, and are the most widely and deeply researched quantum dot systems in the academic circle. Into the reaction system to prepare CdZnSeS quantum dots, these methods are only suitable for the preparation of trace or a small amount of sa...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 张涛李晓红刘江国李阳
Owner GUANGDONG POLY OPTOELECTRONICS
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