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Exciton diffusion in solid solutions of luminescent lanthanide β-diketonates
Mingzhao Liu1, Zhanlan Yang2, Shifu Weng2
1Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA. mzliu@bnl.gov.
Physical Chemistry Chemical Physics : PCCP
|December 22, 2020
Summary
Lanthanide β-diketonate solid solutions show enhanced europium (Eu3+) emission. Energy transfer from non-luminescent chelates to Eu3+ occurs via ligand triplet states and π-π stacking.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photochemistry
Background:
- Lanthanide β-diketonates are widely studied for their luminescent properties.
- Efficient energy transfer is crucial for optimizing lanthanide ion emission in solid-state materials.
Purpose of the Study:
- To synthesize and characterize luminescent lanthanide β-diketonate solid solutions.
- To investigate the mechanism of enhanced Eu3+ emission in these solid solutions.
Main Methods:
- Co-precipitation synthesis of TBAEuxM1-x(TTA)4 solid solutions (M = La or Gd).
- Low-temperature luminescence spectroscopy to study emission and phosphorescence.
- Crystallography analysis to determine structural properties.
Main Results:
- Eu3+ emission efficiency significantly increased in the presence of non-luminescent chelates.
- Ligand phosphorescence quenching indicates efficient intermolecular energy transfer.
- Quantitative analysis suggests exciton-like energy transfer involving approximately 30 ligands per Eu3+ center.
- π-π stacking of TTA- ligands in neighboring units facilitates triplet exciton diffusion.
Conclusions:
- Intermolecular energy transfer through triplet excited states of TTA- ligands enhances Eu3+ emission.
- Efficient energy transfer is facilitated by π-π stacking and exciton diffusion in the solid solutions.
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