Co-doped perovskite nanocrystals for multiplexed anticounterfeiting applications

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Colloidal perovskite nanocrystals (NCs) doped with transition and lanthanide metals exhibit efficient visible to near-infrared (NIR) emission.
• These luminescent properties are promising for advanced security applications requiring multi-modal authentication.

Purpose of the Study:

• To explore the use of Mn-doped and Yb-Mn co-doped perovskite NCs for photoluminescence-based security features.
• To investigate the integration of overt (visible) and covert (NIR) emission pathways for enhanced encryption.
• To assess the stability and dynamic functionalities (write/erase) of these engineered security features.

Main Methods:

• Synthesis of Mn-doped and Yb-Mn co-doped perovskite nanocrystals.
• Fabrication of printed security patterns utilizing these NCs.
• Evaluation of photoluminescence properties (visible and NIR emission).
• Assessment of material stability under ambient, moisture, and thermal stress.
• Chemical engineering via anion exchange reactions to tune host-dopant energy transfer.

Main Results:

• Demonstrated efficient visible emission from Mn-dopants for overt security.
• Achieved NIR emission from Yb-dopants for covert information concealment.
• Confirmed stability of engineered printed patterns under various environmental conditions.
• Successfully implemented write and erase functionalities through anion exchange-mediated energy transfer tuning.

Conclusions:

• Mn- and Yb-Mn co-doped perovskite NCs provide a versatile platform for advanced photoluminescence-based security features.
• The combination of visible and NIR emission, coupled with tunable energy transfer, enables complex encryption strategies.
• Engineered perovskite NC security features exhibit promising stability and dynamic reconfigurability for anti-counterfeiting and data security.