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Production method for quantum dot solid powder

A technology of solid powder and production method, applied in the field of quantum dots, can solve problems such as destructiveness and destroy the physical and chemical properties of quantum dots, and achieve the effects of excellent performance, uniform size, and overcoming fine particle size.

Active Publication Date: 2016-07-27
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Semiconductor nanocrystals (or quantum dots) are quasi-zero-dimensional nanomaterials, usually with three dimensions between 1 and 10 nanometers. Nanocrystals show unique physical and chemical properties due to their own quantum effects, among which The surface ligands of quantum dots play a key role in the properties of quantum dots, such as passivating the surface, improving the luminous efficiency of quantum dots, ensuring the monodispersity of quantum dots, preventing the aggregation of quantum dots, and improving the film-forming properties of quantum dots , Improve the optical and electrical properties of quantum dots, etc. The current traditional drying process for quantum dots is destructive to the surface of the obtained solid quantum dots, destroying the physical and chemical properties of quantum dots

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  • Production method for quantum dot solid powder
  • Production method for quantum dot solid powder
  • Production method for quantum dot solid powder

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Embodiment 1

[0028] The processing flow of a quantum dot desolventization process method provided by the embodiment of the present invention is as follows: figure 1 As shown, the following processing steps are included:

[0029] Step S110, after the quantum dots are synthesized, use a suitable solvent combination to purify the quantum dots, add the purified quantum dots to tert-butanol and wash them thoroughly, and perform centrifugation and precipitation treatment on the washed quantum dots.

[0030] The aforementioned synthesis of quantum dots includes, but is not limited to, quantum dots synthesized in water phase or oil phase.

[0031] The choice of solvent is dictated by the surface ligands of the bound quantum dots. For quantum dots synthesized in oil phase, the solvent includes toluene, chloroform, n-hexane and / or cyclohexane. For quantum dots synthesized in water phase, the solvent includes water, ethanol, isopropanol, butanol and / or ethyl acetate.

[0032] Step S120, redispersi...

Embodiment 2

[0038] For some quantum dots synthesized in oil phase such as CuInZnS quantum dots, after synthesis and purification, a part of quantum dots is dried by traditional process, and another part of quantum dots is dried by the process method of the present invention: redisperse with 0.5mL of chloroform, then add 50mL of tert-butanol was used to precipitate the quantum dots, solidified with liquid nitrogen and placed in a lyophilizer for lyophilization.

[0039] For quantum dots synthesized in aqueous phase such as CdSe, after synthesis and purification, a part of the quantum dots is dried by the traditional process, and another part of the quantum dots is dried by the process of the present invention; redispersed with 0.5mL of water, and then added 500mL of tert-butanol When the quantum dots are precipitated, they are solidified with liquid nitrogen and placed in a lyophilizer.

[0040] figure 2 , 3 are the CuInZnS quantum dots of the oil phase synthesis that are made by the tra...

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Abstract

The invention provides a production method for quantum dot solid powder. The method mainly includes the steps that after quantum dots are synthesized, the quantum dots are dispersed in a solvent, tertiary butanol is added to the solvent, the quantum dots are separated out of the solvent, the separated-out quantum dots are cured, the cured quantum dots are freeze-dried, and the quantum dot solid powder is obtained. According to the method in the embodiment, the defects that an existing process can damage ligands on the surfaces of nano-crystals, and nano-crystal powder with fine particles, uniform size and excellent performance cannot be obtained are effectively overcome, through reasonable solvent matching and the freeze-drying technology, the high-quality quantum dot powder is obtained while the ligands on the surfaces of the quantum dots are overall preserved, and therefore the physical and chemical properties of the quantum dots are well protected.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a production method of quantum dot solid powder. Background technique [0002] Semiconductor nanocrystals (or quantum dots) are quasi-zero-dimensional nanomaterials, usually with three dimensions between 1 and 10 nanometers. Nanocrystals show unique physical and chemical properties due to their own quantum effects, among which The surface ligands of quantum dots play a key role in the properties of quantum dots, such as passivating the surface, improving the luminous efficiency of quantum dots, ensuring the monodispersity of quantum dots, preventing the aggregation of quantum dots, and improving the film-forming properties of quantum dots , Improve the optical and electrical properties of quantum dots, etc., the current traditional drying process of quantum dots is destructive to the surface of the obtained solid quantum dots, destroying the physical and chemical properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/00C09K11/62C09K11/88B82Y20/00B82Y40/00C01G15/00C01B19/04
CPCB82Y20/00B82Y40/00C01B19/007C01G15/006C09K11/00C09K11/623C09K11/88
Inventor 唐爱伟刘振洋
Owner BEIJING JIAOTONG UNIV
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