CHISOS
CHIral Saddle-shaped Organic Semiconductors
Supervisor: David KREHER | Employer: Universté Paris-Saclay | 3i dimension: interdisciplinary;international 📥 CHISOS
Contact: david.kreher@uvsq.fr; cyrille.barreteau@cea.frAbstract: Optical rotation, electronic circular dichroism (ECD), and circularly polarized luminescence (CPL) techniques clearly confirm the ability of optically active molecules to modulate the properties of circularly polarized light. This specific interaction between light and chiral matter has generated considerable interest within the scientific community due to its practical applications in various fields and is now considered a cutting-edge technology for 3D display devices. With this in mind, we will explore the synthesis and photophysical and chiroptical properties of enantioenriched chromophores based on combinations of COTPh or COTTh and porphyrin pigments, thereby creating new families of 3D OSCs with improved solubility, stability, and chiroptical activities, thanks to the synergy between the saddle-shaped core and the pigment properties.
Project Objectives
The project offers a wide range of perspectives and both an interdisciplinary and international dimension, addressing various aspects: i) bridging experiments and theory: Density functional theory (DFT) will be used by partner 1 to model the electronic structure of various classes of chiral molecules. This approach will enable a fine-characterization of the transition magnetic dipole moments, transition electric dipole moments, and the angle between them. This will help us both to select the most promising targets to be synthesized by project leaders (Fig. 2) and to optimize chiroptical activities via symmetry-based rational design. ii) multi-chiroptical characterization: the chiroptical properties will be examined through ECD, CPL and VCD measurements with the expertise of partner 2:10 this complementary and multifaceted analysis of optical activities will provide a comprehensive understanding of the structure–property relationships in enantioenriched molecules iii) from rational design to real-world applications: the ultimate goal of this project is not only to create a new library of optically active (COTPh) and (COTTh) molecules with unique chiroptical properties but also to deliver meaningful scientific contributions across multiple fields: in particular, we believe they could serve as active materials for emitting dissymmetric CPL in organic light-emitting diodes (CP-OLEDs), which explains the presence in the consortium of partner 3. In addition, if accepted, this innovative project would strengthen the recently-existing collaboration in the framework of the France/Japan CNRS International Research Project (IRP) LUX-ERIT the project leaders belong to. We must emphasize also that the negatively curved architectures of our saddle-shape molecules offer also a promising avenue for high-performance multifunctional chiral materials after modulating their chiroptical properties via supramolecular host-guest interaction with fullerene guest.
Host Laboratory: ILV 3i Host Laboratory: CEA Paris-Saclay/IRAMIS/SPEC/GMT group (ED EDOM)
Specific skills and requirements
Pre-requisite: Strong academic background in optics (Fourier optics, light–matter interaction, laser physics, fiber optics or optoelectronics), with strong motivation for laboratory work and interest in physical phenomena.; Solid academic background in mathematics for signal processing (Fourier transforms, basic statistics, random processes, and filtering).
Advantageous: Proven skills in signal processing and signal simulation using Python and/or MATLAB.; Experience with laser-based experimental setups for sensing, handling of fiber optics and/or free-space optics, as well as spectral signal analysis.; Experience working in interdisciplinary projects and ability to communicate scientific results, both orally and in writing.
Biographies
Thesis Director Short Bio: Organic and material chemist, I am interested in structure/property relationships, developing pi-conjugated organic (nano)materials. This versatility is reflected both in my teaching and in my research and my scientific collaborations which are crucial, such as with Pr. C. Adachi (Japan), a main partner of this proposal at the international. More precisely, my activities are positioned at the interface of many fields, and in this context I am currently coordinating projects aimed at the synthesis and study of the properties of new materials for optoelectronics applications. In addition, I always invested myself significantly both in teaching (by coordinating Master formations) and in the context of various local or national bodies (member of CNU 33 for 10 years, member of CoCNRS section 12 for 5 years, member of an ANR comitee, ....).
3i Co-supervisor Short Bio: Cyrille BARRETEAU and his team are experts in research topics such as i) Electronic structure of surfaces and nanostructures, ii) coupling between morphology, and/or iii) Spin polarized transport in nano-contacts as well as Molecular spintronics.
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