FRODO · Fluorene and dihydroindenofluorene Rings for Optoelectronic Devices Outcomes

Fluorene and dihydroindenofluorene Rings for Optoelectronic Devices Outcomes

Based on the recent developments of cyclo-para-phenylenes (CPPs), the project aimed to synthesize and study a new class of cyclic organic semi-conductors (OSCs) based on bridged oligophenylenes building blocks, such as cyclofluorene or cyclodihydroindenofluorene, for Organic Electronic (OE) applications. After synthesis, the main goal of this proposal was to define a precise structure properties relationship study on cyclic bridged oligophenylenes. Defining these general rules through such structure-properties relationship studies should allow a perfect control of the properties of cyclic bridged oligophenylenes, which is the foundation of the materials design for OE. Another objectives for the applicant was to learn many new skills and knowledges in cyclic OSCs, physico-chemistry and in electronic devices fabrication and characterization and thus acquire a rare and multidisciplinary scientific profile, which is a key feature for an academic career. Indeed, at the beginning of this project, the applicant wished to become a permanent CNRS researcher at the University of Rennes 1 in the host group. At the end of the action, seven new cyclic OSCs based on bridged oligophenylenes building blocks, such as fluorene and carbazole, have been synthesized, isolated and studied. They are varying by their size (4 or 5 units) and by the length of the alkyl chains linked to the bridge (to the carbone atom for fluorene and nitrogen atom for carbazole). Thus, a precise structure properties relationship study has been done, with a study of the influence of the number of units in the cyclofluorene on its properties and the influence of the presence of the bridge on the properties of cyclofluorenes and cyclocarbazoles (compared to CPP) and its nature (carbon atom or nitrogen atom), including the length of the alkyl chains. This last parameter allows us to tune the electronic properties of the cyclic bridged oligophenylenes, which was totally unexpected. Furthermore, one cyclocarbazole has been used as active layer in a p-type channel Organic Field Effect Transistor (OFET). This work shows not only that nanorings can be used as an active layer in an OFET but also provides a first benchmark for nanorings since this work is the first incorporation of a nanoring in an OFET and hence the first example of a transfer characteristic and a FE mobility. Concerning the professional objectives of the applicant, they have been perfectly achieved since the applicant was successful to the CNRS competition thanks to her multidisciplinary scientific profile. Thus the applicant is a permanent CNRS researcher at the University of Rennes 1 in the host group since October 2018, 1st.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз