研究目的
Investigating the solvent-dependent sensitization of ytterbium and neodymium via an intramolecular excimer.
研究成果
The study demonstrates that the NIR-emission of neodymium and ytterbium can be obtained through ligand-centered sensitization from a ligand possessing a di(1-pyrenyl) moiety. The sensitization is solvent-dependent and correlates with the presence of an excimer-like emission. The sensitization was found to be more efficient with the anionic ligands, and energy transfer was more efficient with ytterbium than neodymium. The results open the possibility of associating well-known pyrene-containing materials or sensors with lanthanides, which could lead to new luminescent materials or enhanced NIR detection.
研究不足
The study is limited by the weak binding strength of the phosphine oxide and carbonyl moiety of the ligand to lanthanides, which can be displaced by polar coordinating solvents, thus shutting down sensitization. Additionally, the presence of a high number of C-H oscillators in the sensitizing ligand may decrease lanthanide luminescence quantum yields.
