Fully efficient direct Yb-to-Er energy transfer at molecular level in a near-infrared emitting heterometallic trinuclear quinolinolato complex

ARTIZZU, FLAVIA;QUOCHI, FRANCESCO;Marchiò L;SESSINI, ELISA;SABA, MICHELE;SERPE, ANGELA;MURA, ANTONIO ANDREA;MERCURI, MARIA LAURA;BONGIOVANNI, GIOVANNI LUIGI CARLO;DEPLANO, PAOLA

2013-01-01

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Abstract

Combined chemical/photophysical studies on the mixed Yb–Er trinuclear lanthanide quinolinolato compound Yb2ErQ9 and on the corresponding Yb3Q9 analogue have been performed. In the mixed-metal molecular species, the ligands, acting as a bridge, allow the two metals to lie at optimal distance for direct Yb-to-Er resonance energy transfer, which reaches nearly unitary efficiency. The obtained results show that polynuclear lanthanide complexes provide a suitable strategy for achieving effective erbium sensitization in solution-processable molecular materials.