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Method for improving stability of mixed halogen perovskite

A perovskite and stable technology, applied in the field of optoelectronic materials and devices, can solve problems such as spectral instability, and achieve the effects of simple operation, improved photoluminescence quantum yield, and easy access.

Active Publication Date: 2021-04-09
FUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize the blue and red emission of perovskites, the strategy of mixing halogens is usually adopted, but the mixed halogens will undergo phase separation under the bias voltage, resulting in the problem of spectral instability.

Method used

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  • Method for improving stability of mixed halogen perovskite

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preparation example Construction

[0034] The light-emitting device prepared by using the mixed halogen perovskite material obtained in the present invention comprises an anode layer, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode stacked on the substrate from bottom to top. Floor. Its preparation method comprises the following steps:

[0035] 1) Provide an anode substrate;

[0036] 2) Before depositing the hole injection layer on the anode substrate, the substrate is cleaned, and then dried in an oven;

[0037] 3) On the cleaned anode substrate, the hole injection layer is deposited by solution method, and its thickness is controlled between 20-40nm;

[0038] 4) On the hole injection layer, the hole transport layer is deposited by solution method, and its thickness is controlled between 20-40nm;

[0039] 5) The perovskite material prepared in the present invention is used as the light-emitting layer material, and the light-emitting layer is...

Embodiment

[0050] A kind of preparation of mixed cation perovskite quantum dot, its specific steps are as follows:

[0051] 1) PbBr 2 , PbCl 2 Mix with TOAB at a molar ratio of 0.7:0.3:2, dissolve in toluene, and obtain a solution A with a total substance concentration of 0.3M;

[0052] 2) Change Cs 2CO 3 with Rb 2 CO 3 Mix and dissolve in n-octanoic acid with a molar ratio of 0.9:0.1 to obtain a solution B with a total substance concentration of 0.1M;

[0053] 3) Dissolve FA(Ac) in n-octanoic acid to obtain a solution C with a concentration of 0.2M;

[0054] 4) Dissolve DDAB in toluene to obtain a concentration of 10 mg mL -1 solution D;

[0055] 5) Rapidly inject 0.85ml of solution B and 0.15ml of solution C into 9ml of solution A, stir magnetically at room temperature for 5 minutes, add 3ml of solution D, continue stirring for 2 minutes, then add ethyl acetate at a volume ratio of 1:2 for extraction , collect the precipitate after centrifugation and disperse the precipitate i...

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Abstract

The invention discloses a method for improving the stability of mixed halogen perovskite. The method comprises the steps of mixing and dissolving mixed lead halide and tetra-n-octyl ammonium bromide in toluene to obtain a solution A; dissolving cesium carbonate and rubidium carbonate in n-caprylic acid to obtain a solution B; dissolving formamidine acetate in n-caprylic acid to obtain a solution C; dissolving didodecyl dimethyl ammonium bromide into methylbenzene to obtain a solution D; and mixing the solution B and the solution C, then rapidly adding the mixture into the solution A, adding the solution D under the conditions of room temperature and magnetic stirring, and adding ethyl acetate for extraction to finally obtain the mixed halogen perovskite. By processing according to the method, the obtained mixed halogen perovskite material has relatively good stability and photoelectric property, and has relatively high brightness and stability when being applied to preparation of a perovskite light-emitting device.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials and devices, and in particular relates to a method for improving the stability of mixed halogen perovskites by introducing mixed cations. Background technique [0002] Perovskite materials are widely used in photovoltaics, photoelectric detection, lighting display, laser and other fields due to their advantages such as tunable wavelength, high light absorption coefficient and long carrier diffusion length. Unlike traditional cadmium-based quantum dots, the luminescence peak position of halide perovskite quantum dots can not only be adjusted by changing the size, but also a wide range of spectral shifts can be achieved by changing the ratio of its halogens (ie Cl, Br, I). At present, green perovskite materials have achieved good performance, but blue and red materials still have a lot of room for improvement. In order to realize the blue and red emission of perovskite, the strategy...

Claims

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Application Information

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IPC IPC(8): C09K11/66
CPCC09K11/665
Inventor 李福山鞠松蔓胡海龙朱阳斌杨开宇郭太良
Owner FUZHOU UNIV
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