A5030607950- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Surface and Thin Film Phenomena
- Luminescence and Fluorescent Materials
- Liquid Crystal Research Advancements
- Strong Light-Matter Interactions
- Graphene research and applications
- Photonic Crystals and Applications
- Photochemistry and Electron Transfer Studies
- Force Microscopy Techniques and Applications
- Plasmonic and Surface Plasmon Research
- Nonlinear Optical Materials Studies
- Metamaterials and Metasurfaces Applications
- Polydiacetylene-based materials and applications
- Porphyrin and Phthalocyanine Chemistry
- Supramolecular Self-Assembly in Materials
- Thin-Film Transistor Technologies
- Mechanical and Optical Resonators
- Nanowire Synthesis and Applications
- Nonlinear Optical Materials Research
- Photonic and Optical Devices
Sorbonne Université
2015-2024
Kyushu University
2021-2024
Institut Parisien de Chimie Moléculaire
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Délégation Paris 6
2016-2020
UPMC Health System
2020
Laboratoire de Chimie des Polymères Organiques
2006-2017
3M (United States)
2014
Institut des Vaisseaux et du Sang
2014
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007-2008
Abstract A new dicyanodistyrylbenzene‐based phasmidic molecule, (2Z,2′Z)‐2,2′‐(1,4‐phenylene)bis(3‐(3,4,5‐tris(dodecyloxy)phenyl)acrylonitrile), GDCS, is reported, which forms a hexagonal columnar liquid crystal (LC) phase at room temperature (RT). GDCS molecules self‐assemble into supramolecular disks consisting of pair in side‐by‐side disposition assisted by secondary bonding interactions the lateral polar cyano group, which, turn, constitute LC structure. shows very intense green/yellow...
A two-dimensional molecular sieve has been realized. It consists of a host matrix molecularly engineered building blocks self-assembled at the liquid-solid interface. The simultaneous size- and shape-dependent dynamics different guest molecules is observed in situ, real time with submolecular resolution using scanning tunneling microscope both interface under vacuum. temperature-dependent reveals that diffusion proceeds through thermally activated channeling between single-molecule surface cavities.
The electroluminescence of a polythiophene wire suspended between metallic surface and the tip scanning tunneling microscope is reported. Under positive sample voltage, spectral voltage dependencies emitted light are consistent with fluorescence junction mediated by localized plasmons. This emission strongly attenuated for opposite polarity. Both mechanism polarity dependence similar to what occurs in organic emitting diodes (OLED) but at level single molecular wire.
We present the rational design of an organic cage combining electron-donating (D) triazatruxene and electron-accepting (A) triphenyl triazine connected by three electronically inert pillars. This controlled architecture leads to a precise spatial separation cofacial alignment D A motifs. Such induces efficient intramolecular through-space charge transfer (TSCT), providing small singlet–triplet energy difference (ΔEST) 0.049 eV, thus gives rise thermally activated delayed fluorescence (TADF)...
Clip chemistry: When a fully deterministic strategy that parallels polymer chemistry is used, mono-, bi-, and trifunctional clip-bearing building blocks form noncovalent surface-self-assembled dimers, polymers, 2D networks, respectively (see scheme). These entities can then be subjected to further higher-level manipulations, as shown by controlled reorganization (cyclization) of polymerlike chain around molecular block. Supporting information for this article available on the WWW under...
A molecular wire containing an emitting center is controllably suspended between the plasmonic electrodes of a cryogenic scanning tunneling microscope. Passing current through this circuit generates ultranarrow-line emission at energy ≈1.5 eV which assigned to fluorescence center. Control over linewidth obtained by progressively detaching unit from surface. The recorded spectra also reveal several vibronic peaks low intensities that can be viewed as fingerprint emitter. Surface plasmons...
The temperature and concentration dependences of the self-assembly onto graphite from solution a series molecular building blocks able to form nanoporous structures are analyzed experimentally by in situ scanning tunneling microscopy. It is shown that commonly observed coexistence dense domains results kinetic blockades rather than thermodynamic equilibrium. ripening can be favored high densities domain boundaries, which obtained cooling substrate before nucleation growth. Then at...
Large electron injection barriers and electrode degradation are serious issues that need to be overcome obtain n-channel operation in field-effect transistors with an organic-inorganic layered perovskite (C6H5C2H4NH3)2SnI4 semiconductor. By employing low-work-function Al source/drain electrodes by inserting C60 layers between the semiconductor reduce barrier suppress degradation, we demonstrate mobilities of up 2.1 cm2/V s, highest value ever reported spin-coated transistors. The transport...
Strong-coupling between excitons and confined photonic modes can lead to the formation of new quasi-particles termed exciton-polaritons which display a range interesting properties such as super-fluidity, ultrafast transport Bose-Einstein condensation. typically occurs when an excitonic material is confided in dielectric or plasmonic microcavity. Here, we show polaritons form at room temperature chemically diverse, organic semiconductor thin films, despite absence external cavity. We find...
Organic light‐emitting diodes (OLEDs) exhibiting thermally activated delayed fluorescence (TADF) have attracted great interest because of their excellent exciton harvesting ability in electroluminescence (EL). While TADF‐OLEDs show a high EL efficiency, the device operational stability is not necessarily satisfactory for commercial applications. Herein, isotope effect host material on investigated. It unveiled that deuterated host, i.e., PYD2Cz‐ d 16 , forms denser film than nondeuterated...
Herein, we report the first example of chiral donor–acceptor cage DA-2 displaying efficient circularly polarized thermally activated delayed fluorescence (CP-TADF) with | g lum values up to 2.1 × 10 −3 and PLQY 32%.
Single crystalline triisopropylsilylethynyl pentacene (TIPS-PEN) arrays are fabricated with both size and shape of each patterned domain precisely tailored by selective contact evaporation printing (SCEP), which exhibit sufficient ON/OFF current ratio as well high field effect mobility.
Colloidal quantum dots (CQDs) are candidates of interest for the design low cost IR detector, especially in short wave infrared (SWIR; 0.8–3 μm), where vicinity visible range makes high available technologies even more striking. HgTe nanocrystals among most promising to address SWIR since their spectrum can be tuned all over this while demonstrating photoconductive properties. However, several main issues have been swept under rug, which prevents further development active materials and...
Single-molecule junctions specifically designed for their optical properties are operated as light-emitting devices using a cryogenic scanning tunneling microscope. They composed of an emitting unit-a molecular chromophore-suspended between Au(111) surface and the tip microscope by organic linkers. Tunneling electrons flowing through these generate narrow-line emission light whose color is controlled carefully selecting chemical structure unit. Besides main line, red blue-shifted vibronic...
Thermally activated delayed fluorescence (TADF) based on through-space donor and acceptor interactions constitute a recent promising approach to develop efficient TADF emitters. Novel isomers using dithia[3.3]-paracyclophane building block as versatile 3D platform promote are presented. Such allows bring together the D A units into close proximity probe effect of their orientation, contact site distance emission properties. This study provides evidence that dithia[3.3]paracyclophane core is...
A nanoengineered surface able to grab selected molecules and further sort them according their size shape by diffusion through molecular sieves is realized. It consists of a customized self-assembled network supramolecular cavities linked channels. The comparison the temperature-dependent hopping dynamics various guest (arrows in figure indicate between neighboring cavities; width: 7.7 nm) reveals physical mechanisms involved processes.
We investigate the charge transport, photophysical and amplified spontaneous emission properties of a series monodisperse solution-processable oligofluorenes functionalized with hexyl chains at C9 position each fluorene unit.
Multi-segregated columnar structures provide a geometrically ideal scheme for ambipolar organic semiconductors, but are not easy to design. A set of novel materials with dyad and triad architectures based on 2 different discotic cores is reported the conditions emergence such complex investigated. The designed molecules associate together electron-donor triphenylene (D) perylene or naphthalene diimides as acceptor moieties (A), both entities being linked via alkyl chain spacers. evaluation...
Abstract Enhanced Kerr nonlinearities are observed in metamaterials such as conducting oxides and doped inorganic semiconductor thin films showing epsilon‐near‐zero (ENZ) response the infrared region. However, to achieve ENZ visible, artificial with more complex nanostructures have be specifically designed. Here, using sodium [5,6‐dichloro‐2‐[[5,6‐dichloro‐1‐ethyl‐3‐(4‐sulphobutyl)‐benzimidazol‐2‐ylidene]‐propenyl]‐1‐ethyl‐3‐(4‐sulphobutyl)‐benzimidazolium hydroxide]...
The photophysical properties of novel donor–acceptor dyad and triad molecules show an intricate interplay between energy electron transfer processes.
Abstract 2D organic–inorganic perovskites are an emerging class of materials with great potential for optoelectronics since a wide variety large functional chromophores can be regularly incorporated. Among this new type materials, hybrid perovskite systems incorporating strong electron acceptor molecules considered as promising approach to designing optoelectronics. In work, rare example acceptors such naphthalene diimide (NDI) building blocks between inorganic sheets is presented. This...
We have analyzed by STM the detailed structures of a series nanoporous honeycomb networks stabilized alkyl chain interdigitation on graphite at liquid−solid interface, that is, clip-like noncovalent bonding. The variations observed as function length peripheral aliphatic chains show assembly is directed not only lateral intermolecular interactions but also adsorption site substrate. derive an atomically accurate model for registry with our systems. In full agreement quantitative model, pore...
Structural and electronic properties of oligothiophene nanowires rings synthesized on a Au(111) surface are investigated by scanning tunneling microscopy. The spectroscopic data the linear cyclic oligomers show remarkable differences which, to first approximation, can be accounted considering state confinement one-dimensional boxes having, respectively, fixed periodic boundary conditions. A more detailed analysis shows that polythiophene must treated as ribbon (i.e., having an effective...