Method and application of water vapor-mediated solid phase perovskite anion exchange

By using a water vapor-mediated solid-phase perovskite anion exchange method, non-halogen substances can be detected by fluorescence color changes, which solves the problem that existing technologies can only analyze halogen substances and enables the application of humidity sensing.

CN116773497BActive Publication Date: 2026-05-29SHAANXI NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI NORMAL UNIV
Filing Date
2023-06-21
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing sensing methods based on perovskite anion exchange can only analyze halogenated substances and cannot detect non-halogenated substances.

Method used

A water vapor-mediated solid-phase perovskite anion exchange method was adopted. CsPbX3 and Cs4PbX6 perovskite solutions were mixed and dropped onto a dry filter paper substrate, and then placed in the test environment to carry out a humidity-mediated anion exchange reaction. Non-halogen substances were detected by fluorescence color change.

Benefits of technology

It enables direct detection of ambient humidity through changes in fluorescence color, expands the sensing application range of perovskite anion exchange, and allows humidity values ​​to be observed with the naked eye.

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Abstract

The application discloses a water vapor-mediated solid-phase perovskite anion exchange method and application, and belongs to the technical field of fluorescence sensing. The water vapor-mediated solid-phase perovskite anion exchange method is characterized in that water vapor is used to mediate anion exchange between solid CsPbX3 and Cs4PbX6 perovskite nanocrystals on a paper substrate for the first time, and the fluorescence color change range of anion exchange between fluorescent CsPbBrI2 and non-fluorescent Cs4PbBr6 perovskite is the largest, and the fluorescence color change degree within a certain time range is positively correlated with the environmental humidity, so that the application has a wide application prospect.
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