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BIMR Seminar Series Speaker Eva Hemmer, University of Ottawa, Department of Chemistry and Biomolecular Sciences

Event Date: 
Monday, March 6, 2017 - 3:30pm to 5:00pm

Lanthanide-based Nanostructures as Potential Players in the Biomedical Field

Lanthanide-based nanostructures are well known for their outstanding optical properties. When doped in appropriate host materials, narrow optical absorption and emission bands as well as long lifetimes of the excited electronic states of the Ln3+ are obtained. Following a stepwise excitation with near-infrared (NIR) light, Ln3+-doped nanostructures show upconversion emission spanning the range from UV to visible and NIR. In addition, NIR light of longer wavelengths (> 1000 nm) can be emitted when appropriate Ln3+  dopants are chosen, which  opens  a  whole  gamut  of  applications including the field of optical bioimaging and sensing. Fluorides, such as NaGdF4, are commonly considered as suitable host materials and their preparation via the thermal decomposition 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 various sizes and shapes (nanoparticles, nanorods) can for instance be obtained by precipitation or solvothermal approaches. Various synthetic strategies leading to upconverting and NIR emitting Ln3+-doped nanostructures will be discussed, and their application of the resultant materials in optical (NIR) bioimaging and beyond will be presented.

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