Chiral perovskite thin film, preparation method and circular polarization light emitting diode device

By introducing halogen-substituted chiral ligands at the perovskite interface, the problem of lattice distortion at the perovskite interface was solved, achieving efficient circularly polarized light emission and stable device performance, and improving the external quantum efficiency and circularly polarized light emission polarization of the device.

CN120865892AActive Publication Date: 2025-10-31INNER MONGOLIA UNIV OF TECH
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Patent Information

Application Number
CN202511403386.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-29
Publication Date
2025-10-31
Estimated Expiration
2045-09-29

AI Technical Summary

Technical Problem

The large steric hindrance effect of cations in existing chiral organic ligands can induce lattice distortion at the perovskite interface, destroying structural symmetry and forming a large number of defects at the interface, affecting material stability and device efficiency.

Method used

Chiral compounds were formed by ion exchange reaction of phenylalanine hydrochloride and tetrafluoroborate solutions. A pseudohalogenated chiral ligand was introduced, and deep-level defects were passivated by coordinating the lone pair electrons on the carbonyl C=O group with Pb2+ ions at the perovskite interface. Spin-polarized charge carriers were then injected by spin-selectively into the chiral perovskite layer.

Benefits of technology

It improves device efficiency and circular polarization emission polarization, enhances material stability and device performance, and significantly improves external quantum efficiency and circular polarization emission efficiency.

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Abstract

The invention belongs to the technical field of polarized light-emitting materials, and particularly relates to a chiral perovskite thin film, a preparation method and a circularly polarized light-emitting diode device. Phenylalanine hydrochloride is used as a raw material, a phenylalanine hydrochloride solution and a tetrafluoroborate solution are mixed, an ion exchange reaction is carried out, a chiral compound with tetrafluoroborate as anions and phenylalanine as cations is formed, and a pseudo-halogen substituted chiral ligand is obtained; an anti-solvent is utilized to introduce a pseudo-halogen substituted chiral ligand into a perovskite precursor solution, and a layer of chiral perovskite film is formed on a perovskite interface, so that spin-polarized carriers are selectively and effectively injected by utilizing chiral induced spin, and are compounded in a device to generate circular polarization luminescence.
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