Preparation method of perovskite quantum dot film

Abstract

The invention discloses a preparation method of a perovskite quantum dot film. The method comprises the following steps: 1) preparation of perovskite quantum dot polymer particles; and 2) preparationof a perovskite quantum dot film: enabling PP particles, EVOH particles and the perovskite quantum dot polymer particles prepared in the step 1) to respectively pass through a vacuum feeding system, adding the mixture into an extruder A, an extruder B, an extruder C, an extruder D and an extruder E, and extruding to form a film through a multi-layer co-extrusion casting machine to obtain the required perovskite quantum dot film. According to the method, a thermoplastic elastomer is used as a dispersing agent, perovskite quantum dot polymer particles are prepared by using a high-temperature thermal injection method, tedious centrifugation, separation and redispersion are not needed, and the perovskite quantum dot polymer particles and other polymers are directly co-extruded to obtain the perovskite quantum dot film, so that the method is simple in process and low in cost, the implementation efficiency is improved; and meanwhile, the optical performance and stability of the perovskite quantum dot can be ensured.

Description

technical field [0001] The invention belongs to the technical field of perovskite quantum dot films, and in particular relates to a preparation method of perovskite quantum dot films. Background technique [0002] Due to its excellent fluorescence properties, perovskite quantum dot films can be used as optical conversion films for wide color gamut liquid crystal display (LCD) backlight modules, and have great market potential. Since perovskite quantum dots are sensitive to water and oxygen, in order to protect perovskite quantum dots from the influence of water and oxygen in the surrounding environment, perovskite quantum dots are usually dispersed in polymer materials and used with high barrier optical The film protects it. Usually, the preparation of perovskite quantum dot films requires the synthesis of perovskite quantum dots in organic solvents by thermal injection, followed by centrifugation, separation and purification, and then the purified quantum dots are evenly m...

AI Technical Summary

Problems solved by technology

However, due to the excessive removal of surface ligands of PQDs during the separation and purification process, the insufficient passivation of the surface ligands of PQDs often results in poor fluorescence efficiency (PL QY ) is low and the photostability is poor

In addition, this type of perovskite quantum dot film requires the use of a water-oxygen barrier film with high barrier properties to ensure the aging stability of the quantum dot film, which greatly increases the production cost of the quantum dot film

Moreover, the preparation of quantum dot films by coating has high requirements on equipment and technology, especially when preparing low-thickness quantum dot films, which cannot meet the requirements, and the current liquid crystal displays such as mobile phones and tablets have upper limits on the thickness of optical films. Requirements, some products require a thickness of less than 55um, therefore, it is necessary to explore a simple and efficient method to prepare perovskite quantum dot film, which can effectively prepare ultra-thin products while ensuring its durability under harsh aging conditions, especially in Under the conditions of light aging and high temperature and high humidity aging, it has high-efficiency luminescence and good stability

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