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Proceedings Paper

Controlling energy transfer routes in dye-sensitized lanthanide-based nanoparticles for enhanced emission
Author(s): Jing Liu; Rik Van Deun; Luca Pilia; Pieter Geiregat; Flavia Artizzu
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Paper Abstract

Near-infrared luminescent lanthanide (Ln)-doped nanomaterials are currently attracting high interest in view of their sharp f-f emission peaks and long luminescence lifetimes, which establish a unique value for the development of optical amplifiers, lasers and biosensors. To improve the optical pumping of the weakly absorbing lanthanide ions (Ln3+), the doped nanoparticles are coupled with an organic dye sensitizer able to efficiently harvest light and subsequently transfer the absorbed energy to the emitter. However, this through-space “remote” sensitization is severely subjected to energy losses due to competitive energy migration or deactivation routes limiting the overall luminescence quantum yields. The implementation of the Förster’s model of resonance energy transfer on the basis of advanced ultra-fast transient absorption and photoluminescence spectroscopy with the support of density functional theory calculations demonstrate that the sensitization efficiency from the dye to the doped nanoparticle is strictly regulated by the geometry and localization of the transition dipole moment of the dye molecule. Within the nanoparticle, the energy transfer pathways can be harnessed through the spatial confinement of ‘energy bridges’, accepting energy from the surface dyes and donating to core emitters. We show that the FITC (fluorescein-isothiocyanate) dye allows reaching exceptional sensitization efficiency close to unity for the NIR-emitting triad Nd3+, Er3+ and Yb3+.

Paper Details

Date Published: 28 February 2020
PDF: 8 pages
Proc. SPIE 11277, Organic Photonic Materials and Devices XXII, 112770E (28 February 2020); doi: 10.1117/12.2544218
Show Author Affiliations
Jing Liu, Southwest Univ. (China)
Rik Van Deun, Univ. Gent (Belgium)
Luca Pilia, Univ. degli Studi di Cagliari (Italy)
Pieter Geiregat, Univ. Gent (Belgium)
Flavia Artizzu, Univ. Gent (Belgium)

Published in SPIE Proceedings Vol. 11277:
Organic Photonic Materials and Devices XXII
Christopher E. Tabor; François Kajzar; Toshikuni Kaino, Editor(s)

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