Preparation method of quantum dot material based on modified bismuth-based perovskite and electroluminescent device

Abstract

The invention provides a preparation method based on a modified bismuth-based perovskite quantum dot material and an electroluminescent device, and belongs to the technical field of electroluminescent devices.The preparation method comprises the steps that a mixed solvent of dimethyl sulfoxide and octylamine is adopted as a precursor solution for dissolving cesium bromide, bismuth bromide and cesium chloride, and amine is adopted as a ligand; a mixed solvent of oleic acid and ethanol is used as an anti-solvent; and adding the precursor solution into an anti-solvent, heating, stirring, cooling to room temperature, centrifuging, taking supernate, washing with n-hexane, and finally dispersing into ethanol to obtain the modified bismuth-based perovskite quantum dot material. According to the method, a proper amount of cesium chloride is added into a solution of synthesized perovskite quantum dots, the perovskite quantum dots passivated by chlorine elements are obtained, surface defects of the quantum dots are passivated by introducing a proper amount of chloride ions, the stability of the perovskite quantum dots is effectively improved, and the fluorescence yield is greatly improved; the dark blue light electroluminescent device based on the bismuth-based perovskite as the luminescent material is obtained for the first time.

Description

technical field [0001] The invention relates to the technical field of electroluminescence devices, in particular to a preparation method and an electroluminescence device based on a modified bismuth-based perovskite quantum dot material. Background technique [0002] Quantum dot materials are widely used in the fields of display and lighting due to their tunable light-emitting wavelength, high quantum yield and stability, simple synthesis method, and convenience for the preparation of light-emitting devices by solution method. research focus. Active light-emitting electroluminescent diode technology using quantum dots as light-emitting materials is one of the important applications of quantum dot materials. This technology is hailed by the industry as the second best technology after organic light-emitting diode technology due to its wide color gamut coverage, high stability and high luminous efficiency. Next-generation display technology. Among them, the research of deep...

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Problems solved by technology

[0003] Although the lead-based perovskite quantum dot material developed in recent years has good photoelectric properties, its application conditions are largely limited due to its high toxicity and easy decomposition in polar solvents. , so the lead-free Cs3Bi2Br9 quantum dot material is considered to be one of the most promising candidate materials, but its low photoluminescence quantum yield hinders its application in deep blue photoluminescent devices

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