Synthesis and spectroscopic properties of monocyclic and bicyclic erbium phtalocyanines |
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Authors: | Laurent Divay Pierre Le Barny Brigitte Loiseaux Jacques A Delaire |
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Institution: | 1. Route Départementale 128, Thales Research and Technology, 91767, Palaiseau Cedex, France 2. PPSM and D’Alembert Institute, Ecole Normale Supérieure de Cachan, 61, avenue du Président Wilson, 94235, Cachan Cedex, France
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Abstract: | Bimacrocyclic and monomacrocyclic erbium phtalocyanines have been synthesized and their luminescence spectra and lifetimes have been studied. The bi-planar structure of ErPc2 complexes, although interesting at first sight, is non-luminescent because of a strong absorption band near 1.5 μm. However, the luminescence of the erbium ion can be recovered after oxidation or reduction of the macrocycle. Monomacrocyclic erbium phtalocyanines exhibit a strong luminescence of erbium as a result of the energy transfer between the excited phtalocyanine macrocycle and the erbium ion. With a perchlorinated phtalocyanine and a perdeuterated axial ligand in a deuterated solvent, the luminescence lifetime reaches 5 μs, which is the maximum lifetime found for conventional perdeutarated ligands. The large absorption cross-section of phtalocyanine in the red may counterbalance the fast luminescence lifetime, allowing the hope for a new all-organic integrated optical amplifier device. |
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