Three isostructural hexanuclear lanthanide-organic frameworks for sensitive luminescence temperature sensing over a...

Area of Science:

• Materials Science
• Inorganic Chemistry
• Nanotechnology

Background:

• Temperature sensing is critical for scientific research and advanced technologies.
• Lanthanide metal-organic frameworks (Ln-MOFs) offer tunable properties for sensing applications.

Purpose of the Study:

• To synthesize and characterize novel isomorphic hexanuclear lanthanide metal-organic frameworks (Ln-MOFs).
• To investigate the potential of these Ln-MOFs as ratiometric luminescence thermometers.
• To evaluate their temperature sensing performance over a wide temperature range.

Main Methods:

• Cluster-based synthesis strategy using three dicarboxylate ligands.
• Characterization via single-crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), elemental analysis (EA), and Fourier transform infrared spectra (FT-IR).
• Eu³⁺/Tb³⁺ co-doping for luminescence studies.

Main Results:

• Three isomorphic hexanuclear Ln-MOFs, Ln(BPDC-xN) (Ln = Eu³⁺/Tb³⁺, x = 0, 1, 2), were successfully synthesized.
• Eu_0.001Tb_0.999(BPDC-xN) (x = 0, 1, 2) demonstrated potential as ratiometric luminescence thermometers.
• High relative sensitivity was observed across a wide temperature range (50 K to 300 K) due to efficient energy transfer.

Conclusions:

• The developed Ln-MOFs are effective ratiometric luminescence thermometers.
• The structural design facilitates efficient energy transfer, enabling broad-range temperature sensing.
• These materials hold promise for applications requiring precise temperature monitoring.