Multifunctional ligand modified mixed halogen perovskite quantum dot and application thereof

A multifunctional, perovskite technology, applied in the fields of electro-solid devices, semiconductor devices, semiconductor/solid-state device manufacturing, etc., can solve problems such as poor performance of light-emitting diodes, achieve performance improvement, inhibit phase separation, and improve charge extraction with injected effect

Active Publication Date: 2021-12-28
JINAN UNIVERSITY
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Problems solved by technology

[0005] Aiming at the defects of the prior art, the present invention provides a multifunctional ligand passivation modified mixed halogen perovskite quantum dot and its application, by adopting the Carboxyl and amino groups, and a multifunctional ligand that also contains a functional group that can form a hydrogen bond with the halogen in the mixed halogen perovskite quantum dots, and passivates the mixed halogen perovskite quantum dots. It has the functions of passivating the surface defects of mixed-halogen perovskite quantum dots and inhibiting phase separation, which solves the difficulty of passivating defects and inhibiting the phase separation of mixed-halogen perovskite at the same time in the existing technology, resulting in poor performance of the light-emitting diode prepared by the quantum dots good technical questions

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  • Multifunctional ligand modified mixed halogen perovskite quantum dot and application thereof
  • Multifunctional ligand modified mixed halogen perovskite quantum dot and application thereof
  • Multifunctional ligand modified mixed halogen perovskite quantum dot and application thereof

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preparation example Construction

[0036] In some embodiments, the preparation method of the mixed halogen perovskite quantum dots includes the following steps: mixing and stirring the multifunctional ligand with the mixed halogen perovskite quantum dot solution, and the liquid obtained after solid-liquid separation phase, that is, mixed-halide perovskite quantum dots modified by multifunctional ligand passivation.

[0037] In some embodiments, the preparation of the mixed halogen perovskite quantum dot solution includes the following steps: centrifuging the mixed halogen perovskite quantum dot solution with an anti-solvent to obtain quantum dot precipitation; The quantum dots are precipitated to obtain a mixed halogen perovskite quantum dot solution.

[0038] In some embodiments, the mixed halogen perovskite quantum dot solution is prepared by conventional quantum dot preparation methods such as thermal injection method or anion exchange method.

[0039] In some embodiments of the present invention, the perform...

Embodiment 1

[0055] A multifunctional ligand-modified mixed-halogen perovskite quantum dot, the quantum dot structure is CsPbBrI 2 , the multifunctional ligand is tryptophan.

[0056] Add 0.1682g of cesium carbonate, 8mL of octadecene, and 0.5mL of oleic acid into a 100mL flask, and heat to 120°C with ventilation until the cesium carbonate is completely dissolved. 0.0230g PbBr 2 with 0.0578g PbI 2 and 5mL of octadecene, 0.5mL of oleic acid, and 0.5mL of oleylamine were added to a 100ml flask, heated to 120°C and then vacuum-dried for 1 hour, fed with nitrogen, heated to 150°C, and injected with 0.4mL of the pre-prepared cesium carbonate solution After 5 seconds of reaction, the reaction was terminated immediately with an ice-water bath. The obtained stock solution is mixed with ethyl acetate at a volume ratio of 1:3, centrifuged at a speed of 14000 rpm for 7 minutes, and the precipitate is dissolved in n-hexane to obtain the mixed halogen perovskite CsPbBrI 2 Quantum dot solution. The...

Embodiment 2

[0063] A multifunctional ligand-modified mixed-halogen perovskite quantum dot, the quantum dot structure is CsPbBrI 2 , the multifunctional ligand is threonine.

[0064] Add 0.1682g of cesium carbonate, 8mL of octadecene, and 0.5mL of oleic acid into a 100mL flask, and heat to 120°C with ventilation until the cesium carbonate is completely dissolved. 0.0230g PbBr 2 with 0.0578g PbI 2 and 5mL of octadecene, 0.5mL of oleic acid, and 0.5mL of oleylamine were added to a 100ml flask, heated to 120°C and then vacuum-dried for 1 hour, fed with nitrogen, heated to 150°C, and injected with 0.4mL of the pre-prepared cesium carbonate solution After 5 seconds of reaction, the reaction was terminated immediately with an ice-water bath. The obtained stock solution is mixed with ethyl acetate at a volume ratio of 1:3, centrifuged at a speed of 14000 rpm for 7 minutes, and the precipitate is dissolved in n-hexane to obtain the mixed halogen perovskite CsPbBrI 2 Quantum dot solution. Then...

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Abstract

The invention belongs to the technical field of preparation of perovskite quantum dots, and particularly relates to a multifunctional ligand modified mixed halogen perovskite quantum dot and application thereof. The structure of the multifunctional ligand not only contains carboxyl groups and amino groups which can passivate surface defects of mixed halogen perovskite quantum dots, but also contains functional groups which can form hydrogen bonds with halogen in the mixed halogen perovskite quantum dots. Experiments prove that the multifunctional ligand interacts with the mixed halogen perovskite quantum dots to passivate the defects of the mixed halogen perovskite quantum dots and inhibit possible phase separation of the mixed halogen perovskite quantum dots in an electric field. The efficiency of a light-emitting diode prepared from the mixed halogen perovskite quantum dot modified by a mixed halogen perovskite quantum dot solution passivated and modified by the multifunctional ligand exceeds 18%, and spectrum stability is good.

Description

technical field [0001] The invention belongs to the technical field of preparation of perovskite quantum dots, and more specifically relates to a multifunctional ligand-modified mixed halogen perovskite quantum dot and its application. Background technique [0002] Perovskite quantum dots have the advantages of simple synthesis method, wide color gamut, and adjustable band gap, and have great potential application value in light-emitting diodes, solar cells, photodetectors and other fields. [0003] Through the development in recent years, the research on pure halogen perovskite quantum dot light-emitting diodes has made great progress, but the research on mixed halogen perovskite quantum dot light-emitting diodes is still slow. The main reason is that the mixed halogen perovskite quantum dots have many surface defects, which will cause phase separation when applied in light-emitting diodes, resulting in spectral shift and device performance degradation. [0004] Chinese pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66H01L51/50H01L51/54H01L51/46
CPCC09K11/025C09K11/665H10K85/60H10K85/615H10K85/6572H10K50/115Y02E10/549
Inventor 张继斌侯林涛陈虹婷
Owner JINAN UNIVERSITY
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