Lead halide perovskite nanocrystalline-polymer film and preparation method thereof
A technology of polymer film and perovskite, applied in the field of lead halide perovskite nanocrystal-polymer film and its preparation, can solve the problems such as inability to effectively block the diffusion of water molecules, decrease in fluorescence performance, complicated preparation process, etc. Achieve excellent air and water stability, improve hydrophobicity and film-forming properties
Active Publication Date: 2021-07-20
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
The disadvantage of this method is that the preparation process is more complicated, and the coated CsPbX 3 Significant decline in fluorescence properties of nanocrystals after long-term storage
However, due to the strong hydrophilicity of PEI, it cannot effectively block the diffusion of water molecules, and it is difficult to completely solve the problem of insufficient stability of lead halide perovskite nanocrystals. body still has great limitations
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] see figure 1As shown, the present invention provides a lead halide perovskite nanocrystal-polymer film and a preparation method thereof, wherein the lead halide perovskite nanocrystal-polymer film comprises a polymer and a lead halide perovskite nanocrystal, Polymers include random copolymers and decylenediamine, random copolymers include styrene and vinylbenzyl chloride, decanediamine includes amino groups, wherein vinylbenzyl chloride covalently reacts with amino groups to form covalent bonds to achieve The random copolymer and decanediamine were connected to form amino-functionalized polymer multidentate ligands, which enhanced the binding of ligands to the surface of lead halide perovskite nanocrystals in a synergistic manner with multi...
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The invention discloses a lead halide perovskite nanocrystal-polymer film and a preparation method thereof.The lead halide perovskite nanocrystal-polymer film comprises a polymer and lead halide perovskite nanocrystals, the polymer comprises a random copolymer and decamethylene diamine, the random copolymer contains benzyl chloride, the decamethylene diamine contains amino, and the benzyl chloride and the amino form a covalent bond for connecting the random copolymer and the decamethylene diamine to form an amino-functionalized polymer polydentate ligand, and the amino-functionalized polymer polydentate ligand is in coordination combination with lead halide perovskite nanocrystals. According to the lead halide perovskite nanocrystal-polymer film, amino groups are introduced into a random copolymer to form an amino-functionalized polymer multidentate ligand, so that the binding force between the ligand and lead halide perovskite nanocrystals is enhanced; and furthermore, the random copolymer has a hydrophobic group, so that the lead halide perovskite nanocrystal-polymer film has excellent air stability and water stability.
Description
technical field [0001] The invention relates to a lead halide perovskite nanocrystal-polymer film and a preparation method thereof, belonging to the technical field of nanocrystal surface modification. Background technique [0002] Studies have shown that lead halide perovskite materials are extremely unstable in humid environments and are easily destroyed by H 2 O molecules attack and degrade. due to H 2 O molecules can diffuse rapidly in the structure of lead halide perovskite nanocrystals, which can easily lead to material degradation in seconds even at low humidity. Kelly et al. studied the degradation mechanism of lead halide perovskite and found that the activation energy of its surface atoms is low, and it is easy to interact with H 2 O molecules form hydrated intermediates and induce the degradation of lead halide perovskite nanocrystals (ACSNano, 2015, 9(2):1955-1963). If the CsPbBr 3 Exposure of nanocrystals to a humid environment will cause the dissociation o...
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IPC IPC(8): C08J5/18C08L27/04C08K5/17C08K3/16
CPCC08J5/18C08J2327/04C08K5/17C08K3/16
Inventor 宇文力辉代速来汪联辉仇球
Owner NANJING UNIV OF POSTS & TELECOMM