Clément BROUILLAC PhD Defense

Donor-Acceptor π-conjugated systems: spiro compounds and nanohoops for electrophosphorescent organic diodes

University of Rennes – Beaulieu Campus
Building 10B, Grandjean Amphitheater

Friday December 15, 2023 - 2:00 p.m.



Condensed Matter and Electroactive Systems team

Jury:

  • Fabrice MATHEVET, Directeur de Recherche CNRS, Institut Parisien de Chimie Moléculaire (IPCM), Sorbonne Université / Rapporteur
  • Grégory PIETERS, Chercheur CEA, CEA Paris Saclay / Rapporteur
  • Cyril AUMAITRE, Chercheur CEA, CEA Grenoble / Examinateur
  • Lucie NOREL, Professeure des Universités, Université de Rennes, ISCR / Examinatrice
  • Cassandre QUINTON, Chargée de recherche CNRS, Université de Rennes, ISCR / Co-encadrante de thèse
  • Cyril PORIEL, Directeur de recherche CNRS, Université de Rennes, ISCR / Directeur de thèse

Abstract:
Organic electronics (EO) is based on organic semiconductors (OSCs). Organic light-emitting diodes (OLEDs) are among the most mature EO technologies and are already present in our smartphones, computers and televisions. During this thesis, we were particularly interested in the development of host materials for the second generation of OLEDs: organic electrophosphorescent diodes (PhOLEDs). Two different molecular designs have been elaborated with two different objectives. The first objective was to develop new host materials using the Donor spiro-Acceptor architecture for single-layer PhOLEDs, which are simplified devices using only the electrodes and the emissive layer. This work has enabled the fabrication of single-layer PhOLEDs in the three colours present in a pixel (red, green and blue) and in the colours used for lighting (yellow and white). Device performance records have been obtained. The second objective was to develop new SCOs, with a cylindric shape, called nanohoops. After a bibliographic chapter analysing the performance of nanohoops in EO, we present a structure/properties study of Donor-Acceptor nanohoops. This work enabled us to gain a better understanding of the unique properties of these carbazole-based nanohoops, which were then incorporated into multilayer PhOLEDs to measure their performances. This work provides the first exemples of the field.


Contact: Cyril Poriel (3 59 77) - cyril [dot] porielatuniv-rennes [dot] fr