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. © 2010 American Chemical Society.
Pizzoferrato, R., Francin, I., Pietrantoni, S., Paolesse, R., Mando, J., Monguzzi, A., et al. (2010). Effects of Progressive Halogen Substitution on the Photoluminescence Properties of an Erbium-Porphyrin Complex. JOURNAL OF PHYSICAL CHEMISTRY. A, MOLECULES, SPECTROSCOPY, KINETICS, ENVIRONMENT, & GENERAL THEORY, 114(12), 4163-4168 [10.1021/jp9119183].
Effects of Progressive Halogen Substitution on the Photoluminescence Properties of an Erbium-Porphyrin Complex
MONGUZZI, ANGELO MARIA;MEINARDI, FRANCESCO
2010
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. © 2010 American Chemical Society.
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