Res. Chem. Intermed.
, Vol. 34, No. 2–3, pp. 127–136 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Synthesis and spectroscopic properties of monocyclic and
bicyclic erbium phtalocyanines
, PIERRE LE BARNY
and JACQUES A. DELAIRE
Thales Research and Technology, Route Départementale 128, 91767 Palaiseau Cedex, France
PPSM and D’Alembert Institute, Ecole Normale Supérieure de Cachan,
61, avenue du Président Wilson, 94235 Cachan Cedex, France
Received 10 November 2006; accepted 15 January 2007
Abstract—Bimacrocyclic and monomacrocyclic erbium phtalocyanines have been synthesized and
their luminescence spectra and lifetimes have been studied. The bi-planar structure of ErPc
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 counter-
balance the fast luminescence lifetime, allowing the hope for a new all-organic integrated optical
Keywords: Erbium phtalocyanine; erbium luminescence; energy transfer.
Erbium-containing materials are of major importance for optical ﬁbre telecommu-
nications, in view of their current generalized use as gain media in optical ampliﬁers
operating at the 1.55 μm standard telecommunication wavelength . Despite the
huge development of erbium-doped silica-based ﬁbre ampliﬁers (EDFAs), there is
still a need for new erbium-based materials. The use of erbium organic complexes
could offer advantageous alternative to inorganic erbium oxides due to both the pos-
sibility to incorporate them in organic polymer ﬁlms and the potential efﬁciency of
the energy transfer between a strongly absorbing ligand and the erbium ion.
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