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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Humidity Assisted Selective Ion Exclusion in 0D Mixed Halide Perovskite Related Structures for Multimode

Sumit Kumar Sharma1, Monika Salesh2, Abinash Tiwari1

  • 1Centre for Research in Nanotechnology and Science, Indian Institute of Technology Bombay, Mumbai, 400076, India.

Small (Weinheim an Der Bergstrasse, Germany)
|August 1, 2025
PubMed
Summary

New mixed halide perovskite materials switch luminescence color from green to red with humidity changes. These stable, flexible films offer advanced anti-counterfeiting solutions.

Keywords:
anti‐counterfeitingdimensionalityhalide perovskitesluminescencepolymer composites

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Advanced anti-counterfeiting strategies require materials with stimuli-responsive luminescence.
  • Solid-state luminescence switching is crucial for secure authentication technologies.

Purpose of the Study:

  • To develop novel 0D mixed halide perovskite-related structures (0D-MHs) for humidity-induced, reversible luminescence color switching.
  • To investigate the mechanism of phase transformation and its effect on luminescence properties.
  • To create stable, flexible films for practical anti-counterfeiting applications.

Main Methods:

  • Synthesis of 0D mixed halide perovskite-related structures.
  • Investigation of phase transformation triggered by varying humidity levels (e.g., <30%RH and >60%RH).
  • Characterization of luminescence properties and structural changes.
  • Fabrication of flexible, free-standing composite films with PVDF.

Main Results:

  • 0D-MHs exhibit reversible luminescence color switching from green to red in response to humidity.
  • Humidity-induced selective ion exclusion leads to the formation of iodide-rich or bromide-rich 3D perovskites.
  • The materials demonstrate stability in water and maintain reversible phase transformation for over a year under ambient conditions.
  • Flexible films show promise for durable anti-counterfeiting applications.

Conclusions:

  • Humidity-induced reversible phase transformation in 0D-MHs enables tunable, multicolor luminescence.
  • The developed materials and flexible films are suitable for advanced anti-counterfeiting applications due to their stability and responsiveness.
  • This work presents a new pathway for designing smart luminescent materials for security features.