Preparation method of quantum dot film

Abstract

Disclosed is a preparation method of a quantum dot film. The preparation method of the quantum dot film comprises the following steps that (1) a metal oxide film with the nanometer or sub-micron thickness is formed on the surfaces of quantum dots in a deposition mode through an atomic layer deposition technology so as to cover the quantum dots; (2) the quantum dots with covering metal oxide coat an organic film polyethylene terephthalate substrate, so that the quantum dot film is obtained through preparation; and (3) oxide films with the nanometer or sub-micron thickness are formed on the surface of the quantum dot film and the surfaces of the quantum dots in a deposition mode through a spatial separation atomic layer deposition technology so as to ensure that the quantum dots are not oxidized. According to the preparation method of the quantum dot film, due to the fact that the method with the step that passive films cover the surfaces of the quantum dots step by step is adopted to prepare the quantum dot film, the problem that due to the fact that the quantum dots are prone to being oxidized, the luminescence performance of the quantum dots is lost is solved, and the preparation method has the advantages of being simple in preparation technology, low in preparation cost and the like.

Description

technical field [0001] The invention belongs to the field of optical material preparation, and more specifically relates to a method for preparing a quantum dot thin film. Background technique [0002] Quantum dots, also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements. The particle size of quantum dots is generally between 1 and 10 nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and can emit fluorescence after being excited. The emission spectrum of quantum dots can be controlled by changing the size of the quantum dots. It has good photostability, wide excitation spectrum and narrow emission spectrum. It has a wide range of applications in the fields of solar cells, light-emitting devices, and optical biomarkers. However, because quantum dots are easily damaged by water or oxygen in the air, they lose their luminescent properties. ...

AI Technical Summary

Problems solved by technology

The emission spectrum of quantum dots can be controlled by changing the size of the quantum dots. It has good photostability, wide excitation spectrum and narrow emission spectrum. It has a wide range of applications in the fields of solar cells, light-emitting devices, and optical biomarkers. However, because quantum dots are easily destroyed by water or oxygen in the air, they lose their luminous properties

[0003] In order to solve the above problems, the current method is to coat the quantum dot material on the organic film PET, and then deposit a passivation protective film on the organic film PET to prevent the entry of water and oxygen, thereby protecting the quantum dots, but This requires the water permeability and oxygen permeability of the protective film to reach 10 -5 However, when preparing large-area PET films, it is difficult to achieve the required 10 even using SALD technology -5 order of magnitude, this method has high technical requirements, which greatly increases the preparation cost of the quantum dot film, and at the same time makes the passivation film uneven, and even some parts have no film, which cannot achieve the effect of protecting quantum dots

Therefore, the traditional quantum dot film preparation method is not suitable for large and wide PET films.

Images