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Influence of the metal ion on the two-photon absorption properties of lanthanide complexes including near-IR emitters. | LitMetric

AI Article Synopsis

  • The study successfully synthesized complexes of lanthanide(III) and yttrium with a specific bipyridine coligand, revealing their potential for near-infrared emission.
  • The photophysical analysis showed that the bipyridine ligand functions effectively as an antenna to enhance the NIR emitters' performance.
  • The research indicated that the type of rare earth ion has minimal impact on the two-photon absorption properties, with notable differences in sensitization mechanisms for Yb(III) and Nd(III).

Article Abstract

The synthesis of tris(2-thenoyltrifluoroacetonate)lanthanide(III) complexes featuring a diethylaminostyryl-2,2'-bipyridine coligand was achieved for lanthanum; the near-infrared (NIR) emitters neodymium, erbium, and ytterbium; and the transition-metal yttrium. The photophysical properties were thoroughly studied, and it was demonstrated that the conjugated bipyridine ligand acts as a good antenna for the sensitization of the NIR emitters. The two-photon absorption (TPA) properties of all five complexes were investigated by using both two-photon excited fluorescence and the Z-scan method. We demonstrate that the nature of the rare earth ion has almost no influence on the TPA properties centered on the conjugated bipyridyl ligand. Finally, we show that Yb(III) is sensitized by a two-photon antenna effect, and that Nd(III) is mostly sensitized by a one-photon process involving direct excitation of forbidden f-f transitions.

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Source
http://dx.doi.org/10.1002/cphc.201300501DOI Listing

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