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Yellow red wave band quantum dots, and synthesis method and application thereof

A synthesis method, technology of quantum dots, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as poor air stability and resistance to photobleaching

Pending Publication Date: 2019-12-10
NANJING TECH CORP LTD
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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 yellow-red band quantum dot, its synthesis method and its application, so as to solve the problem that the yellow-red band quantum dot in the prior art is not resistant to photobleaching and has poor air stability

Method used

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Examples

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Effect test

preparation example Construction

[0028] In another typical implementation of the present application, a method for synthesizing yellow-red band quantum dots is provided. The synthesis method includes: step S1, providing a first solution containing CdSe quantum dot cores; step S2, dissolving the first The solution is mixed with the first cadmium precursor and the first zinc precursor to form the first reaction system, and after the first reaction system is heated to the first temperature, the selenium precursor is injected into the first reaction system to form the CdSe quantum dot core CdZnSe alloyed shell layer is coated on the top, and the second solution of alloyed CdSe@CdZnSe is obtained after purification; step S3, the second solution is mixed with the second cadmium precursor and the second zinc precursor to form a second reaction system, and the After the second reaction system is heated to the second temperature, the first sulfur precursor is injected into the second reaction system to coat the CdZnS a...

Embodiment 1

[0055] Example 1: Synthesis of 580nm CdSe@CdZnSe / CdZnS quantum dots

[0056] (1) Coating of CdZnSe layer:

[0057] 1). The Cd(Ac 2 ) 2 ﹒ 2H 2 O 26.6mg (0.1mmol), zinc acetate 0.183g (1mmol), oleic acid (OA) 1.12g (4mmol), ODE were weighed in sequence and placed in a 100mL three-necked bottle, and a magnet was added to the three-necked bottle, and nitrogen was passed. , and raise the temperature of the system in the three-necked flask to 160° C., stir with a magnet at a speed of 60 rpm / min, and at the same time pass nitrogen to exhaust air and acetic acid for at least 0.5 h.

[0058] 2). Weigh 20 mg of Se powder (0.25 mmol), add 0.5 mL of TOP, and ultrasonically dissolve it to obtain a Se-TOP solution.

[0059] 3). After deoxygenating the system in the three-necked flask, the temperature of the system was raised to 305°C, and CdSe quantum dot cores (UV=525nm, OD=50, 25nmol) were added.

[0060] 4). Inject the Se-TOP solution into the three-necked flask, react for 20 minut...

Embodiment 2

[0074] Embodiment 2: Synthesis of 590nm CdSe@CdZnSe / CdZnS quantum dots

[0075] Operation steps and consumption are with embodiment 1, except that following consumption has been changed:

[0076] (1) Coating of CdZnSe layer:

[0077] CdAc 2 ﹒ 2H 2 The amount of O remains the same, the ZnAc 2 The amount of OA was increased to 5mmol, the amount of OA was increased to 16mmol, and the amount of Se was adjusted to 0.125mmol. Finally, CdSe@CdZnSe quantum dots with a PL of 586nm and a half-peak width of 20nm were obtained.

[0078] (2) Coating of CdZnS layer:

[0079] CdAc 2 ﹒ 2H 2 The amount of O remains the same, the ZnAc 2 The amount of OA was increased to 5mmol, the amount of OA was increased to 16mmol, and the amount of S was adjusted to 0.5mmol. Finally, the quantum dots containing alloyed CdSe@CdZnSe / CdZnS with a PL of 590.5nm, a half-peak width of 21nm, and a QY of 92.5% were obtained.

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Abstract

The invention provides yellow red wave band quantum dots, and a synthesis method and an application thereof. The yellow red wave band quantum dots have an alloyed structure of CdSe@CdZnSe / CdZnS or analloyed structure of CdSe@CdZnSe / CdZnS / ZnS, wherein a ZnS shell layer is one or more layers; and the wavelength of a fluorescence emission peak of the yellow red wave band quantum dots is between 580nm and 640 nm. The yellow red wave band quantum dots have the alloyed structure, so the yellow red wave band quantum dots are resistant to light bleaching and have good air stability. At the same time, the wavelength of the fluorescence emission peak can be realized by controlling the ratio of Cd, Zn and Se.

Description

technical field [0001] The invention relates to the technical field of quantum dot synthesis, in particular to a yellow-red band quantum dot, its synthesis method and its application. Background technique [0002] Quantum Dot (QD) is a semiconductor nanocrystal with a size usually between 1 and 100 nm and having a quantum confinement effect. Due to its special optical and photoelectric properties, such as extremely broad absorption spectrum, very narrow emission spectrum, and high luminous efficiency, by adjusting the size of quantum dots to adjust the corresponding band gap of quantum dots, its electrical properties can be significantly adjusted. , optical properties, etc. Quantum dots have broad application prospects in various components such as light-emitting components or photoelectric conversion components, and have been used in many fields such as display, lighting, solar energy, anti-counterfeiting, and bioluminescent marking. [0003] Among them, quantum dot-based...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y40/00H01L51/50
CPCC09K11/883C09K11/02B82Y20/00B82Y40/00H10K50/115C09K11/88B82Y30/00C01P2004/86
Inventor 陈小朋邵蕾谢阳腊
Owner NANJING TECH CORP LTD
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