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High Quantum Yields from Perfluorinated Binolate Erbium Complexes and Their Circularly Polarized Luminescence
1Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States.
Journal of the American Chemical Society
|February 27, 2024
Summary
Researchers developed novel erbium complexes using fluorinated ligands, achieving record high quantum yields and circularly polarized luminescence (CPL) brightness for potential use in quantum communication technologies.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photophysics
Background:
- Erbium complexes are investigated for luminescent applications.
- Achieving high quantum yields and circularly polarized luminescence (CPL) is crucial for advanced optical technologies.
- Nonradiative decay pathways, such as Csp2-H vibrations, often limit luminescence efficiency in molecular emitters.
Purpose of the Study:
- To synthesize and characterize novel Shibasaki-type erbium complexes.
- To enhance quantum yield and CPL brightness by employing a perfluorinated Binol ligand (F12Binol).
- To explore the impact of varying alkali metals in the secondary coordination sphere on complex structure and properties.
Main Methods:
- Synthesis of Shibasaki-type erbium complexes with F12Binol ligand.
- Spectroscopic analysis including NMR (19F, 7Li) and chiroptical spectroscopy.
- Photoluminescence quantum yield and CPL brightness measurements.
Main Results:
- Achieved record high quantum yields (up to 11%) and CPL brightness (up to 317 M-1 cm-1) for molecular erbium complexes.
- Demonstrated a 19-fold increase in quantum yield and a 6-fold increase in CPL brightness compared to non-fluorinated analogues.
- Observed unexpected structural differences based on the alkali metal (K, Na, Li) in the secondary coordination sphere.
- Identified that total fluorination of the ligand circumvents nonradiative quenching from Csp2-H vibrations.
Conclusions:
- Perfluorinated Shibasaki-type erbium complexes exhibit unprecedented luminescence properties.
- Ligand fluorination is a key strategy to overcome nonradiative decay and enhance luminescence efficiency.
- These findings provide design principles for developing practical molecular emitters for quantum communication and other advanced optical applications.
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