Influence of the Metal Ion on the Two‐Photon Absorption Properties of Lanthanide Complexes Including Near‐IR Emitters |
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| Authors: | Dr Adrien Bourdolle Dr Mustapha Allali Dr Anthony D'Aléo Dr Patrice L Baldeck Dr Kenji Kamada Prof J A Gareth Williams Dr Hubert Le Bozec Dr Chantal Andraud Dr Olivier Maury |
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| Institution: | 1. University Lyon 1, ENS Lyon, CNRS UMR 5182, 46 allée d'Italie 69364 Lyon (France);2. Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), AIST Kansai Center, 1‐8‐31 Midorigaoka, Ikeda, Osaka 563‐8577 (Japan);3. Department of Chemistry, Durham University, South Road, Durham, DH1 3 LE (UK);4. Université de Rennes 1, Sciences Chimiques de Rennes, UMR 6226 CNRS, Campus de Beaulieu, 35042 Rennes Cedex (France) |
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| 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 YbIII is sensitized by a two‐photon antenna effect, and that NdIII is mostly sensitized by a one‐photon process involving direct excitation of forbidden f–f transitions. |
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| Keywords: | lanthanides luminescence near‐infrared nonlinear optics two‐photon absorption |
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