Metal halide perovskite-polycarbonate composite fluorescent film as well as preparation method and application thereof

A metal halide and polycarbonate technology, applied in chemical instruments and methods, luminescent materials, coatings, etc., can solve problems such as high temperature and complex preparation process, improve dispersibility and filler ratio, and inhibit non-radiative recombination. , the effect of improving uniformity and fluorescence intensity

Active Publication Date: 2021-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Dispersing perovskite into inorganic glass is one of the effective composite methods to improve the stability of perovskite, but the preparation process is more complicated and requires high temperature

Method used

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  • Metal halide perovskite-polycarbonate composite fluorescent film as well as preparation method and application thereof
  • Metal halide perovskite-polycarbonate composite fluorescent film as well as preparation method and application thereof
  • Metal halide perovskite-polycarbonate composite fluorescent film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A metal halide perovskite-polycarbonate composite fluorescent film is prepared by the following steps:

[0041] (1) Preparation of perovskite precursor solution: phenethylamine bromide (PEABr), CsBr, PbBr 2 and NaBr were respectively dissolved in the solvent DMSO, and the concentration was controlled to be 0.1 mole per liter. CsBr, PbBr 2 After the solution is mixed, an appropriate amount of DMSO is added to dilute to form CsPbBr 3 Precursor, CsBr:PbBr 2 The molar ratio is 1.6:1; CsBr, PbBr 2 , PEABr solution is mixed and then diluted with appropriate amount of DMSO to form CsPbBr 3(PEABr) Precursor, CsBr:PbBr 2 :PEABr molar ratio is 1.6:1:0.8; CsBr, PbBr 2 , PEABr, and NaBr solutions are mixed and then diluted with an appropriate amount of DMSO to form CsPbBr 3 (PEABr, NaBr) precursor, CsBr:PbBr 2 :PEABr:NaBr molar ratio is 1.6:1:0.8:0.2. PbBr in the precursor solution composed of three different components exemplified above 2 The molar concentration is 0.02 ...

Embodiment 2

[0050] With CsBr in embodiment 1:PbBr 2 :PEABr:NaBr is 1.6:1:0.8:0.2 as an example to compare the effect of heating spin coating at different temperatures. The preparation process of the precursor solution, the preparation and treatment process of the polycarbonate film, and the preparation process of the composite film after preheating are the same as in Example 1.

[0051] Preheating at different temperatures: During the preparation of composite fluorescent films, the CsPbBr 3 (PEABr, NaBr) precursor solution, anti-solvent chlorobenzene, and PC film were preheated on a hot stage at 30°C and 80°C for 15-20min, respectively.

[0052] Figure 5 CsPbBr after preheating at 30°C and 80°C, respectively 3 (PEABr, NaBr)-PC composite fluorescent film absorption spectrum and fluorescence emission spectrum under 400nm excitation, it can be seen that the fluorescence intensity and absorption of the film after 80 ℃ preheating treatment are higher, and the higher fluorescence intensity ...

Embodiment 3

[0057] The preparation and processing process of the polycarbonate film and the preparation process of the composite fluorescent film are the same as in Example 1, the difference lies in the preparation of the perovskite precursor solution and the selection of the anti-solvent type.

[0058] Preparation of perovskite precursor solution: PEABr (phenethyl ammonium bromide), CsI, PbI 2 They were respectively dissolved in the solvent DMSO, and the concentration was controlled to be 0.1 moles per liter. PEABr, CsI, PbI 2 The three solutions were blended according to the ratio of (0~1):1:1 and diluted with appropriate amount of DMSO to form CsPbI 3 (PEABr) precursor solution, PbI in the precursor solution 2 The molar concentration is 0.02 moles per liter.

[0059] Selection of the type of anti-solvent: The difference from Example 1 is that ethyl acetate is used instead of chlorobenzene as the anti-solvent.

[0060] Figure 7 It is the optical photograph of the composite film un...

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Abstract

The invention discloses a metal halide perovskite-polycarbonate composite fluorescent film and a preparation method and application thereof, and the method comprises the following steps: in the N2 atmosphere, spin-coating a perovskite precursor solution on a polycarbonate film, then spin-coating an anti-solvent, and annealing the obtained material to obtain a composite fluorescent film. Cations in the perovskite precursor solution are composed of Cs < + >, Pb < 2 + >, organic amine ions and Na < + >, or are composed of the organic amine ions, Cs < + > and Pb < 2 + >; and the perovskite precursor solution, the polycarbonate film and the anti-solvent are preheated at 30-80 DEG C before use. Through component regulation and control of the perovskite precursor solution, the composite compatibility of perovskite and PC is improved, the surface defect state density of perovskite crystals in the composite film is reduced, and the perovskite-PC composite film achieves high luminous efficiency while obtaining high stability.

Description

technical field [0001] The invention belongs to the field of composite materials and luminescent materials, and in particular relates to a metal halide perovskite-polycarbonate composite fluorescent film and its preparation method and application. Background technique [0002] Metal halide perovskites are BX formed from metal cations (B) and halide anions (X) 6 Ionic crystal material with octahedron as the skeleton, in which B is positive divalent Pb 2+ and Sn 2+ Wait. In order to stabilize this ionic crystal structure, another cation (A) needs to be used as BX 6 The octahedral framework provides support, and A is usually cesium ions (Cs + ), methylamine ion (MA + , CH 3 CH 3 + ) and formamidine ion (FA + , HN=CHCH 3 + )Wait. [0003] This metal halide perovskite has the advantages of narrow emission spectrum, adjustable band gap, low raw material cost and solution processability. However, this metal halide perovskite material is easily affected by water and oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08L69/00C08K3/16C09K11/02C09K11/06C09K11/66
CPCC08J7/06C09K11/025C09K11/06C09K11/665C08J2369/00C08K3/16
Inventor 陈江山徐经纬马东阁
Owner SOUTH CHINA UNIV OF TECH
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