Perovskite quantum dot and preparation method thereof, quantum dot composition and quantum dot device

Abstract

The invention provides a perovskite quantum dot preparation method, which comprises the steps of: preparing a first solution: mixing a metal halide, an organic acid, a first ligand and / or a second ligand, and carrying out a reaction at a temperature T1 to obtain a first solution containing a halogen precursor, or mixing a metal halide and an organic acid, and conducting reacting at the temperature T1 to obtain a first solution containing the halogen precursor; preparing a second solution: mixing lead carboxylate, cesium carboxylate, a second ligand, a non-coordination solvent and optional fatty amine, and conducting reacting at the temperature T2 to obtain the second solution, or mixing lead carboxylate, cesium carboxylate, a first ligand, a second ligand, a non-coordination solvent and optional fatty amine, and conducting reacting at the temperature T2 to obtain the second solution; and mixing the first solution and the second solution, and conducting reacting at the temperature T3 to obtain the perovskite quantum dots. The finally prepared perovskite quantum dot has high fluorescence quantum yield and excellent stability.

Description

technical field [0001] The invention relates to the technical field of quantum dot materials, in particular to a perovskite quantum dot and a preparation method thereof, a quantum dot composition and a quantum dot device. Background technique [0002] Quantum dots In recent years, due to the optical and physical properties of perovskite quantum dots, such as high photoelectric conversion efficiency and low preparation cost, they have received extensive attention in the fields of solar cells, quantum dot films, and light-emitting diodes. . As a light-emitting material, perovskite quantum dots, compared with traditional inorganic semiconductor quantum dots (such as CdSe, CdS, etc.), can achieve full color gamut coverage by adjusting the element ratio and element type in perovskite quantum dots. , and the synthesis method is simple and low cost. Traditional inorganic semiconductor quantum dots often require a coating shell to achieve a high fluorescence quantum yield. Due to...

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Problems solved by technology

However, after coating silica and alumina, the fluorescence quantum yield will be reduced from 67% to 30%.

The light stability of quantum dots is often associated with water and oxygen. When light is used in the presence of oxygen and water, photooxidation will occur on the surface of quantum dots, resulting in poor stability of quantum dots.

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