Thibaut MORVAN PhD defense

Solid State Chemistry and Materials (CSM) team
Abstract
This CIFRE thesis focuses on the development of new luminescent markers through core shell shaping. The physical separation of lanthanide ions through core shell shaping limits intermetallic energy transfers and enables access to optical properties that are unattainable with molecular alloys.
First, a solubility study of homonuclear compounds was carried out to identify the most relevant core shell combinations. An optimized protocol was then developed to reproducibly synthesize core shell particles.
Controlling the shell thickness enables the restriction of energy transfers at the core shell interface, which is further optimized thanks to a gadolinium based interstitial insulating layer.
The combination of this insulating layer and the dilution of emissive rare-earth elements in both the core and shell using optically inactive lanthanide ions enables the optimization of luminescence and almost entirely suppresses intermetallic energy transfers.
Potential applications have been developed, such as dual emission in the visible and infrared ranges, or the combination of a complex non-emissive core composition with an emissive shell.
Samarium and dysprosium ions were used in core shell combinations to expand the pool of available optical signatures.
Finally, the technology transfer from the laboratory to the company Olnica Trace was successfully completed, enabling the scale-up of core shell particle production.
Jury

• Yun Luo – Chargée de Recherche – CNRS – Université Paris Cité / Reporter
• Sébastien Blanchard – Professeur des Universités – Sorbonne Université / Reporter
• Françoise Conan – Professeure des Universités – Université de Bretagne Occidentale / Examiner
• Anne Dolbecq – Directrice de Recherche – Université de Versailles Saint-Quentin-en-Yvelines / Examiner
• Régis Gautier – Professeur des Universités – École Nationale Supérieure de Chimie de Rennes / Examiner
• Olivier Guillou – Professeur des Universités – INSA Rennes / PhD Co-Director
• Carole Daiguebonne – Professeure des Universités – INSA Rennes / PhD Co-Director
• Nicolas Kerbellec – COO & Innovation Director – Olnica Trace / Invited

Contacts
Olivier Guilou, Olivier.Guillou@insa-rennes.fr
Carole Daiguebonne, carole.daiguebonne@insa-rennes.fr