Tunable Room Temperature Phosphorescence From Pillar-Layer Metal-Organic Frameworks by Ligand...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) possess tunable room temperature phosphorescence (RTP), enabling applications in bioimaging, optoelectronics, and optical anti-counterfeiting.
• Developing MOFs with controlled phosphorescence properties is crucial for advanced material design.

Purpose of the Study:

• To propose a ligand halogen-functionalization strategy for synthesizing pillar-layer MOFs with tunable RTP.
• To investigate the impact of halogen functionalization on the photophysical properties of MOFs.

Main Methods:

• Synthesis of three isostructural pillar-layer MOFs (Zn-TRZ-XBA) using 1,2,4-Triazole and halogenated benzoic acids (4-chlorobenzoic, 4-bromobenzoic, 4-iodobenzoic acid).
• Characterization of the synthesized MOFs to determine their structural consistency and photophysical properties, including emission wavelengths and lifetimes.

Main Results:

• Successful synthesis of isostructural MOFs via ligand halogen-functionalization, maintaining structural integrity.
• Achieved tunable phosphorescence emission wavelengths ranging from 505-550 nm and adjustable lifetimes from 30.8-159.4 ms.
• Demonstrated effective optical information encryption using the distinct afterglow colors and lifetimes of the synthesized MOFs.

Conclusions:

• The ligand halogen-functionalization strategy offers a simplified and efficient method for tuning MOF phosphorescence.
• This approach facilitates the elucidation of factors influencing phosphorescence characteristics.
• Provides a novel pathway for designing materials with precisely controlled phosphorescence properties through strategic halogen incorporation.