CN-117165282-B - Preparation of MAPbBr in aqueous solvent3Method for preparing perovskite quantum dot optical film

Abstract

The invention belongs to the technical field of luminescent materials, and relates to a method for preparing a MAPbBr 3 perovskite quantum dot optical film in an aqueous solvent. The invention uses water as solvent, which is different from the prior literature which uses DMF, DMSO, GBL and other organic solvents, thus greatly reducing the preparation cost and the pollution degree to the environment. According to the invention, a colorless transparent film is formed by rapid heating, water is slowly absorbed from air, controllable growth of perovskite in the polymer PVA is realized by adjusting humidity and water absorption time, the performance of the quantum dot film is optimized by HBr and OABr, the solubility of inorganic components in water is greatly increased by HBr, the aggregation problem of quantum dots in the heating process is inhibited by OABr, so that the photoluminescence quantum efficiency of the MAPbBr 3 quantum dot optical film is greatly improved, and the photoluminescence quantum efficiency is as high as 95.3%.

Inventors

• ZHENG JINJIE
• ZHANG HAO
• CAO SHENG
• FU HUI
• YANG WEIYOU

Assignees

• 宁波工程学院

Dates

Publication Date

20260512

Application Date

20221212

Claims (3)

1. 1. A method of preparing a MAPbBr 3 perovskite quantum dot optical film in an aqueous solvent, the method comprising the steps of: S1, dissolving PVA in water, sequentially adding MABr, pbBr 2 and HBr, stirring, and then adding Xin Anxiu, stirring to obtain a precursor solution; s2, carrying out microporous filtration on the precursor solution to obtain a transparent solution; S3, dripping the transparent solution on the surface of the plate glass, obtaining a liquid precursor layer through blade coating, and then performing heating treatment to obtain a film; S4, placing the film in air for humidity treatment until the film becomes green to become the MAPbBr 3 quantum dot film; the PVA in the step S1 is dissolved in water, namely, PVA is added into water with the temperature of 85-95 ℃ and is uniformly stirred for 2-4 hours, and then cooled to room temperature; the solid-liquid ratio of PVA dissolved in water in the step S1 is (5-10) g to 100 mL, and the stirring time is 10-20h; The HBr content in the precursor solution of the step S1 is 1.0-2 wt%o; The adding amount of the octylamine bromine in the step S1 is 0.05-0.15 of MABr mol; and step S3, heating treatment at 80-90 ℃ for 3-5min.
2. 2. The method for preparing the MAPbBr 3 perovskite quantum dot optical film in an aqueous solvent according to claim 1, wherein the pore size of the micropores in the step S2 is 0.4-0.5 μm.
3. 3. The method of preparing a MAPbBr 3 perovskite quantum dot optical film in an aqueous solvent as claimed in claim 1 wherein step S4 has an air humidity of 30 to 60%.

Description

Method for preparing MAPbBr 3 perovskite quantum dot optical film in water-based solvent Technical Field The invention belongs to the technical field of luminescent materials, and relates to a method for preparing a MAPbBr 3 perovskite quantum dot optical film in an aqueous solvent. Background The perovskite quantum dot has wide application prospect in the fields of liquid crystal backlight display, detector and luminescence due to the advantages of high photoluminescence rate, adjustable narrow-band emission, low cost and the like. However, the synthetic methods currently occurring are mostly complex and the products are difficult to apply directly to practical applications. In-situ synthesis is considered to be the most suitable synthesis method for large-scale preparation because of the simple synthesis process, lower cost and large-scale preparation. In the in-situ synthesis process, the use of the polymer not only can increase the viscosity of the precursor solution and thus the uniformity of the prepared film, but also the effective coating of the polymer can effectively increase the water stability and the thermal stability of the film. However, the problems of environmental pollution, cost rise and the like caused by the fact that most of the used solvents are organic solvents in consideration of the problems of solubility of perovskite precursors, boiling point of solvents and the like are solved continuously in the large-scale commercial preparation and development process of perovskite quantum dots by an in-situ synthesis method. Thus, a specific technique is needed to achieve the controlled preparation of perovskite quantum dots in an environmentally friendly and inexpensive solvent system. Disclosure of Invention The invention aims at solving the current situation that an expensive organic solvent is used in the preparation process of the existing organic-inorganic hybrid perovskite quantum dot film, and provides a method for efficiently preparing a MAPbBr 3 quantum dot optical film in a water-based solvent system. The invention aims at realizing the following technical scheme that the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the aqueous solvent comprises the following steps: S1, dissolving PVA in water, sequentially adding MABr, pbBr 2 and HBr, stirring, and then adding Xin Anxiu, stirring to obtain a precursor solution; s2, carrying out microporous filtration on the precursor solution to obtain a transparent solution; S3, dripping the transparent solution on the surface of the plate glass, obtaining a liquid precursor layer through blade coating, and then performing heating treatment to obtain a film; and S4, placing the film in air for humidity treatment until the film becomes green to become the MAPbBr 3 quantum dot film. In the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the aqueous solvent, PVA is dissolved in water in the step S1, namely, PVA is added into water at 85-95 ℃ and uniformly stirred for 2-4 hours, and then cooled to room temperature. Preferably, the PVA-to-water solid ratio in step S1 is (5-10) g/100 mL. Preferably, the stirring time is 10 to 20 hours. The stirring time is controlled to ensure that the polymer is fully and uniformly dispersed in the solution. In the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the aqueous solvent, HBr content in the precursor solution in the step S1 is 1.0-2wt per mill. In the invention, too little HBr is added to lower the luminous efficiency of the film, and too much HBr is added to make the film difficult to be peeled off from the plate glass. In the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the aqueous solvent, the adding amount of the S1 octylamine bromide is 0.05-0.15 of MABr mass. In the invention, the content ratio of OABr to MABr is controlled to be 5 to 15 percent, too many ligands can cause the luminescence peak position to deviate from the application optimal value of 530nm, half-peak width is widened, the luminescence efficiency is low, and the optical performance improving effect is not good if the addition amount is too small. In the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the water-based solvent, the pore diameter of the micropore in the step S2 is 0.4-0.5 mu m. In the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the aqueous solvent, the heating treatment temperature in the step S3 is 80-90 ℃ and the time is 3-5min. In the method for preparing the MAPbBr 3 perovskite quantum dot optical film in the aqueous solvent, the air humidity in the step S4 is 30-60%. Compared with the prior art, the invention has the following beneficial effects: 1. The invention uses water as solvent, which is different from the prior literature which uses DMF, DMSO, GBL and other organic solvents, thus greatly reducing the preparation cost and the pollution degree to the en