Upconversion Lanthanide-Based 2D Metal-Organic Frameworks for Multimode Information Encryption.

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Luminescent 2D metal-organic frameworks (MOFs) are crucial for optoelectronics, sensors, and data storage.
• Current research primarily focuses on down-shifting luminescence, with upconversion luminescence largely unexplored.

Purpose of the Study:

• To synthesize novel 2D MOFs with upconversion luminescence properties.
• To explore the potential of these materials for advanced applications like information encryption.

Main Methods:

• Synthesis of 2D Yb-PMA MOFs doped with Ho3+ (luminescence center) and Yb3+ (sensitizer).
• Construction of multimode emitting MOFs by codoping with Tb3+ or Eu3+.
• Preparation of multilayer stacked 2D MOFs composites via ultrasonic exfoliation.

Main Results:

• Achieved red upconversion luminescence at 660 nm under 980 nm excitation in 2D Yb-PMA MOFs.
• Successfully created MOFs with both upconversion and down-shifting luminescence.
• Demonstrated upconversion luminescence in multilayer stacked 2D MOFs composites through interfacial energy transfer.

Conclusions:

• The developed strategy expands optical modulation in luminescent 2D MOFs.
• Introduced a novel approach for constructing multifunctional luminescent materials.
• Highlighted the potential of these lanthanide-based 2D MOFs for information encryption.