Enabling Multicolor Information Encryption: Oleylammonium-Halide-Assisted Reversible Phase Conversion between Cs₄PbX₆...

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Halide perovskites show thermochromic properties valuable for information encryption.
• Existing perovskite systems have a limited luminescence color gamut, restricting complex multicolor information encryption.

Purpose of the Study:

• To design and synthesize multicolor thermochromic perovskites with luminescence spanning the entire visible spectrum.
• To enable efficient and intelligent information encryption using these novel materials.

Main Methods:

• Utilized oleylammonium halide salts to induce reversible phase transformations in perovskite nanocrystals.
• Investigated the phase transition between nonluminescent Cs4PbX6 and luminescent CsPbX3 nanocrystals upon thermal cycling.
• Demonstrated a proof-of-concept for multicolor information encryption and decryption.

Main Results:

• Successfully designed multicolor thermochromic perovskites with luminescence covering the entire visible spectrum.
• Achieved reversible phase transformation between Cs4PbX6 and CsPbX3 nanocrystals without external additives.
• Demonstrated successful encryption and decryption of multicolor digital information.

Conclusions:

• The developed perovskite system overcomes the luminescence color gamut limitation for advanced information encryption.
• The reversible phase transformation offers an efficient and intelligent mechanism for data security.
• This work significantly advances the understanding of perovskite phase transformations and their application in information encryption.