Heteroleptic samarium complexes with high quantum yields for temperature sensing applications.

Area of Science:

• Coordination Chemistry
• Materials Science
• Photophysics

Background:

• Samarium complexes are of interest for their luminescent and electronic properties.
• Developing novel lanthanide complexes with tailored structures and functionalities is crucial for advanced applications.

Purpose of the Study:

• To synthesize and characterize two new samarium complexes, [Sm(fod)3(L1)] and [Sm(fod)3(L2)].
• To investigate the structural, photophysical, and potential application properties of these samarium complexes.

Main Methods:

• Synthesis and single-crystal X-ray diffraction (SC-XRD) for structural determination.
• Nuclear Magnetic Resonance (NMR) spectroscopy to confirm structural integrity in solution.
• Photoluminescence Quantum Yield (PLQY) and emission lifetime measurements in visible and near-infrared regions.
• Calculation of color parameters, CCT, and band gap values.

Main Results:

• Two samarium complexes with distinct coordination numbers (eight and nine) and geometries were successfully synthesized and characterized.
• The complexes exhibit efficient luminescence with high PLQY values, indicating effective antenna properties of the ligands.
• Energy transfer from the terpyridine ligand to Sm3+ is more efficient than from the diphenyl-phenanthroline ligand.
• Calculated parameters suggest potential use as warm light sources and in optoelectronics.
• Complex 1 demonstrates linear emission intensity-temperature dependence, indicating suitability for temperature sensing.

Conclusions:

• The synthesized samarium complexes possess unique structural and photophysical characteristics.
• The ligand choice significantly influences energy transfer efficiency and luminescence properties.
• These complexes show promise for applications in lighting, optoelectronics, and temperature sensing.