title: Effects of progressive halogen substitution on the photoluminescence properties of an erbium-porphyrin complex.
abstract: We have investigated the photoluminescence properties of porphyrin-based erbium and gadolinium complexes at different levels of halogen substitution. Both the intensity and the decay time of the erbium near-infrared emission correlate with the degree of the halogenation. Conversely, no clear correlation is found with the triplet-state energy levels nor with the intensity of the residual visible emission. Such findings confirm that the key role in the low efficiency of the near-infrared emission is played by the nonradiative quenching of the erbium emitting level due to the vibrational modes of the surrounding C-H bonds.
authors.affiliation: Dipartimento di Ingegneria Meccanica - CNSIM, Università di Roma Tor Vergata, Via del Politecnico, 1-00133 Roma, Italy. Pizzoferrato@uniroma2.it
authors.forename: Roberto
authors.initials: R
authors.lastname: Pizzoferrato
authors.forename: Roberto
authors.initials: R
authors.lastname: Francini
authors.forename: Serena
authors.initials: S
authors.lastname: Pietrantoni
authors.forename: Roberto
authors.initials: R
authors.lastname: Paolesse
authors.forename: Federica
authors.initials: F
authors.lastname: Mandoj
authors.forename: Angelo
authors.initials: A
authors.lastname: Monguzzi
authors.forename: Francesco
authors.initials: F
authors.lastname: Meinardi