Core-shell structure nano crystal and preparation method thereof

Abstract

The invention discloses a core-shell structure nano crystal and a preparation method thereof. The preparation method of the core-shell structure nano crystal comprises the following steps: adding precursors for synthesizing a transition layer into a reaction system containing a nano crystal nucleus so as to coat the surface of the nano crystal nucleus with a transition layer; and coating the surface of the transition layer with an outer shell layer to obtain the core-shell structure nano crystal, wherein there are at least two precursors for synthesizing the transition layer, the precursors are added in a staged gradient heating mode, which comprises at least two temperature steps; and the precursors react on each temperature step to generate a part of the transition layer. Due to the factthat the transition layer is synthesized at different temperature steps, each part of the transition layer is cured for a long term after being synthesized, the finally synthesized transition layer of the nano crystal is more uniform, and the half-peak width of the nano crystal is remarkably reduced.

Description

technical field [0001] The application belongs to the technical field of nanomaterial preparation, and in particular relates to a nanocrystal with a core-shell structure and a preparation method thereof. Background technique [0002] Nanocrystals have the characteristics of high color purity, excellent luminous range adjustability, good biocompatibility, etc., and have great application value in the fields of display, lighting, and biological imaging. [0003] Surface defects in nanocrystals increase the chance of non-radiative transitions, which adversely affect their luminescent properties. In order to solve this problem, a shell layer is generally coated on the surface of the nanocrystalline core to enhance its luminous efficiency and stability. [0004] However, the existing commonly used cladding method is usually carried out by batch injection of shell precursors at high temperature. During the reaction process, the particle size of nanocrystals is difficult to contro...

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Problems solved by technology

[0004] However, the existing commonly used cladding method is usually carried out by batch injection of shell precursors at high temperature. During the reaction process, the particle size of nanocrystals is difficult to control, so that the emission peak of the prepared nanocrystals Larger width at half peak

When the half-height width of nanocrystals is large, it will lead to more adverse consequences: for example, it is not conducive to improving the color gamut of display devices, etc. The development of a synthesis method that can reduce the half-height width of nanocrystals is very useful for the application of nanocrystals. Significance

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