Effects of progressive halogen substitution on the photoluminescence properties of an erbium-porphyrin complex.
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.
Pizzoferrato
Roberto
R
Dipartimento di Ingegneria Meccanica - CNSIM, Università di Roma Tor Vergata, Via del Politecnico, 1-00133 Roma, Italy. Pizzoferrato@uniroma2.it
Francini
Roberto
R
Pietrantoni
Serena
S
Paolesse
Roberto
R
Mandoj
Federica
F
Monguzzi
Angelo
A
Meinardi
Francesco
F