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Sensitization, energy transfer and infra-red emission decay modulation in Yb3+-doped NaYF4 nanoparticles with visible light through a perfluoroanthraquinone chromophore

Abstract: Infra-red emission (980?nm) of sub 10?nm Yb3+-doped NaYF4 nanoparticles has been sensitized through the excitation of 2-hydroxyperfluoroanthraquinone chromophore (1,2,3,4,5,6,7-heptafluro-8-hydroxyanthracene-9,10-dione) functionalizing the nanoparticle surface. The sensitization is achieved with a broad range of visible light excitation (400?600?nm). The overall near infra-red (NIR) emission intensity of Yb3+ ions is increased by a factor 300 as a result of the broad and strong absorption of the chromophore compared with ytterbium?s intrinsic absorption. Besides the Yb3+ NIR emission, the hybrid composite shows organic chromophore-based visible emission in the orange-red region of the spectrum. We observe the energy migration process from the sensitized Yb3+ ions at the surface to those in the core of the particle using time-resolved optical spectroscopy. This highlights that the local environments for emitting Yb3+ ions at the surface and center of the nanoparticle are not identical, which causes important differences in the NIR emission dynamics. Based on the understanding of these processes, we suggest a simple strategy to control and modulate the decay time of the functionalized Yb3+-doped nanoparticles over a relatively large range by changing physical or chemical parameters in this model system.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Scientific Reports. Vol. 7, Art. Num. 5066 (2017)

Editorial: Nature Publishing Group

 Fecha de publicación: 11/07/2017

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1038/s41598-017-05350-9

ISSN: 2045-2322

Proyecto español: MAT2016-80438-P

Proyecto europeo: info:eu-repo/grantAgreement/EC/FP7/303535/EU/Chromophore-Sensitized Up-Conversion in Lanthanide Materials/ChromeSENSUC/

Url de la publicación: https://doi.org/10.1038/s41598-017-05350-9

Autores/as

LU, HAIZHOU

PENG, YU

YE, HUANQING

CUI, XIANJIN

HU, JIANXU

GU, HANG

KHLOBYSTOV, ANDREI N.

GREEN, MARK A.

BLOWER, PHILIP J.

WYATT, PETER B.

GILLIN, WILLIAM P.