Related Experiment Video
Updated: Oct 9, 2025
Inkjet Printing All Inorganic Halide Perovskite Inks for Photovoltaic Applications
Published on: January 22, 2019
Reversible Transformation between Cs3Cu2I5 and CsCu2I3 Perovskite Derivatives and Its Anticounterfeiting Application
Xiangtong Zhang1, Biao Zhou1, Xueping Chen1
1Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Centre for High-Efficiency Display and Lighting Technology, School of Materials and Engineering, Collaborative Innovation Centre of Nano Functional Materials and Applications, Henan University, Kaifeng 475000, China.
Copper halide perovskite derivatives offer a lead-free alternative for optoelectronics. Researchers developed a simple method to synthesize blue and yellow emissive materials with a reversible color-changing transformation for anticounterfeiting applications.
Area of Science:
- Materials Science
- Chemistry
Background:
- Lead halide perovskites show promise in optoelectronics but face toxicity concerns.
- Copper halide perovskite derivatives (CHPDs) are emerging as lead-free alternatives with excellent photoelectric properties.
Purpose of the Study:
- To develop a facile synthesis route for lead-free CHPDs.
- To investigate the reversible emissive color transformation of CHPDs.
- To explore the application of this transformation in anticounterfeiting.
Main Methods:
- One-step synthesis of Cs3Cu2I5 (blue emission) and CsCu2I3 (yellow emission) CHPDs in ethanol at room temperature.
- Triggering reversible chemical transformation between the two CHPDs using ethanol or CsI.
- Characterization of the materials and their emissive properties.
Main Results:
- Successfully synthesized blue-emissive Cs3Cu2I5 (440 nm) and yellow-emissive CsCu2I3 (552 nm) CHPDs.
- Achieved a reversible emissive color change between blue and yellow triggered by ethanol or CsI.
- Demonstrated the potential of this reversible transformation for anticounterfeiting.
Conclusions:
- A facile and efficient method for synthesizing lead-free CHPDs with tunable emission was established.
- The reversible chemical transformation provides a novel mechanism for dynamic color change.
- The developed CHPDs show significant potential for advanced anticounterfeiting technologies.
