Synthesis and Emission Dynamics of Sub-3 ...
Document type :
Article dans une revue scientifique: Article original
DOI :
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Title :
Synthesis and Emission Dynamics of Sub-3 nm Upconversion Nanoparticles
Author(s) :
Amouroux, B. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Eftekhari, A. [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Faculty of Engineering Sciences [Tampere]
Roux, C. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Micheau, J. C. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Roblin, P. [Auteur]
Laboratoire de Génie Chimique [LGC]
Pasturel, M. [Auteur]
Institut de Physique de Rennes [IPR]
Gauffre, F. [Auteur]
Université de Rennes [UR]
Wuerth, C. [Auteur]
Resch-Genger, U. [Auteur]
Sliwa, Michel [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Bouchet, Aude [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Coudret, C. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Eftekhari, A. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Eftekhari, A. [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Faculty of Engineering Sciences [Tampere]
Roux, C. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Micheau, J. C. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Roblin, P. [Auteur]
Laboratoire de Génie Chimique [LGC]
Pasturel, M. [Auteur]
Institut de Physique de Rennes [IPR]
Gauffre, F. [Auteur]
Université de Rennes [UR]
Wuerth, C. [Auteur]
Resch-Genger, U. [Auteur]
Sliwa, Michel [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Bouchet, Aude [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Coudret, C. [Auteur]
Chimie des colloïdes, polymères & assemblages complexes [Softmat]
Eftekhari, A. [Auteur]
Journal title :
Advanced Optical Materials
Abbreviated title :
Adv. Opt. Mater.
Volume number :
-
Pages :
-
Publication date :
2024-07-03
ISSN :
2195-1071
English keyword(s) :
cross relaxation
single-emitter particles
surface quenching rate constant
temperature cycling
ultrasmall upconversion nanoparticles
single-emitter particles
surface quenching rate constant
temperature cycling
ultrasmall upconversion nanoparticles
HAL domain(s) :
Chimie/Chimie théorique et/ou physique
English abstract : [en]
Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields luminescent materials containing a very small number of emitters. Considering the bottom limit of one activator per particle ultrasmall UCNPs ...
Show more >Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields luminescent materials containing a very small number of emitters. Considering the bottom limit of one activator per particle ultrasmall UCNPs offer an unprecedented platform to study the contributions of the different energy transfers at play in upconversion luminescence. Maintaining detectable emission despite the limited number of emitting ions and the high surface-to-volume ratio requires suitable particle architectures. Na(Gd-Yb)F4:Tm3+ emissive sub-3 nm diameter β-phase UCNPs are prepared using a gadolinium-rich composition in situ mixing of the precursors and a microwave high-temperature cycling sequence allowing precise control of the particle size and dispersity. These cores are coated with a NaGdF4 inert shell to minimize the deleterious influence of surface quenching (SQ). Time-resolved luminescence measurements combining standard NIR excitation of the Yb3+ sensitizer and direct UV excitation of the Tm3+ activator are performed to quantify cross relaxation and surface quenching processes. The fine tuning of the number of activators per particle via an optimized synthesis pathway along with the use of an appropriate excitation scheme enabled to provide an accurate analysis of the different mechanisms at play in these model nanoparticles and to characterize the structure of the core-shell architecture.Show less >
Show more >Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields luminescent materials containing a very small number of emitters. Considering the bottom limit of one activator per particle ultrasmall UCNPs offer an unprecedented platform to study the contributions of the different energy transfers at play in upconversion luminescence. Maintaining detectable emission despite the limited number of emitting ions and the high surface-to-volume ratio requires suitable particle architectures. Na(Gd-Yb)F4:Tm3+ emissive sub-3 nm diameter β-phase UCNPs are prepared using a gadolinium-rich composition in situ mixing of the precursors and a microwave high-temperature cycling sequence allowing precise control of the particle size and dispersity. These cores are coated with a NaGdF4 inert shell to minimize the deleterious influence of surface quenching (SQ). Time-resolved luminescence measurements combining standard NIR excitation of the Yb3+ sensitizer and direct UV excitation of the Tm3+ activator are performed to quantify cross relaxation and surface quenching processes. The fine tuning of the number of activators per particle via an optimized synthesis pathway along with the use of an appropriate excitation scheme enabled to provide an accurate analysis of the different mechanisms at play in these model nanoparticles and to characterize the structure of the core-shell architecture.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Research team(s) :
Dynamics, Nanoscopy & Chemometrics (DyNaChem)
Submission date :
2024-07-04T21:03:28Z
2024-07-12T07:01:41Z
2024-07-12T07:01:41Z