Denis ARI PhD defense
From a structure-property relationships to high-performance organic electronic devices: molecular design of nanohoops and pure hydrocarbons
Tuesday 16 December 2025, 14:00Passed
Condensed Matter and Electroactive Systems (MaCSE) team
Abstract
Organic electronic (OE), which aims to design innovative and high-performance devices, exploits the properties of organic semiconductors (OSCs) through detailed structure-property studies. In this thesis, two families of OSCs were investigated in distinct but complementary contexts: nanohoops and pure hydrocarbons (PHCs).
The first part focuses on donor-acceptor nanohoops, strained and original π- conjugated structures, for which a solid structure-property relationship has been established. The study of nanohoops with varying sizes and arrangements, synthesized via a modular approach, highlighted the influence of these parameters on their properties, paving the way for potential applications in OE
The second part is built on this type of well-established structure-property relationship to develop new PHC-based host matrices, composed exclusively of carbon and hydrogen atoms, aimed to improve the stability and performance of blue organic light-emitting diodes (OLEDs). Host matrices derived from spirobifluorene (SBF), a notable fragment among PHCs for the precise control it offers over material properties, were designed and led to blue OLED devices that are both stable and highly efficient.
The two part of this manuscript are representative of research in organic electronics: the first, fundamental, aiming to establish a structure-property relationship, and the second, applied, dedicated to pushing the performance of current devices.
Jury
Anthony D'Aléo - Directeur de recherche, CNRS, Université de Strasbourg, IPCMS / Reviewer
Clément Cabanétos - Directeur de recherche, CNRS, Université Angers, MOLTECH-Anjou / Reviewer
Lydia Sosa Vargas - Chargée de recherche, CNRS, Sorbonne université, IPCM / Examiner
Yann Trolez - Maître de conférence, ENSCR, Université de Rennes, ISCR / Examiner
Cyril Poriel - Directeur de recherche, CNRS, Université de Rennes, ISCR / PhD Co-Director
Cassandre Quinton - Chargée de recherche, CNRS, Université de Rennes, ISCR / PhD Director
Contacts
Denis Ari - denis.ari@univ-rennes.fr
Cyril Poriel - cyril.poriel@univ-rennes.fr
Cassandre Quinton - cassandre.quinton@univ-rennes.fr
