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UID:69dc32e18a297
DTSTAMP:20260412T200345
DTSTART:20161111T113000
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DTEND:20161111T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/708865-upconverting-a
 nd-near-infrared-emitting-nanoparticles-from-synthetic-strategies-to-poten
 tial-applications-eva-hemmer-university-of-ottawa
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Upconverting and Near-Infrared Emitting Nanoparticles: From Synthet
 ic Strategies to Potential Applications - Eva Hemmer (University of Ottawa
 )
DESCRIPTION:Upconverting and Near-Infrared Emitting Nanoparticles: From Syn
 thetic Strategies to Potential Applications - Eva Hemmer (University of Ot
 tawa)
\nLanthanide-based nanostructures are well known for their outstandi
 ng optical properties that are based on the electronic configuration of th
 e trivalent lanthanide ions (Ln3+)\, which is characterized by an incomple
 tely filled 4f shell\, located inside the complete 5s2 and 5p6 shells. Thi
 s results in a shielding of valence electrons\, which are therefore only w
 eakly affected by the environment. Consequently\, when doped in appropriat
 e host materials\, the influence of the host lattice on the optical transi
 tions within the 4f configuration is small\, and narrow optical absorption
  and emission bands as well as long lifetimes of the excited electronic st
 ates of the Ln3+ are obtained. Following a stepwise excitation with near-i
 nfrared (NIR\, typically 980 nm) light\, Ln3+-doped nanostructures show up
 conversion (ultraviolet\, visible and NIR light) emission. In addition\, N
 IR light of longer wavelengths (> 1000 nm) can be emitted under excitation
  with NIR light when appropriate Ln3+ dopants are chosen (e. g.\, Er3+ or 
 Ho3+). Based on this\, Ln3+-doped nanostructures have been suggested for a
  whole gamut of applications including the field of bioimaging and sensing
 . Fluorides\, such as NaGd4\, NaYF4 or LiYF4\, are commonly considered as 
 suitable host materials and their preparation via the thermal decompositio
 n process has been widely studied. Alternatively\, oxides\, such as Gd2O3 
 or Y2O3\, have been suggested as host materials for Ln3+ ions resulting in
  upconverting and NIR emitting nanostructures. Ln3+-doped oxides of variou
 s sizes and shapes (nanoparticles\, nanorods) can for instance be obtained
  by precipitation or solvothermal approaches. In this presentation\, vario
 us synthetic strategies leading to upconverting and NIR emitting Ln3+-dope
 d nanostructures will be discussed\, and their potential and limitations f
 or various applications in biomedicine and beyond will be presented.
\n 

 \nCette conférence s'adresse à tous\, y compris les professeurs\, les ch
 ercheurs et les étudiants des trois cycles.
\n 
\nLe café est servi à 
 partir de 11h30.
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