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1. Design and Integration in Electro-Optic Devices of Highly Efficient and Robust Red-NIR Phosphorescent Nematic Hybrid Liquid Crystals Containing [Mo6I8(OCOCnF2n+1)6]2− (n = 1, 2, 3) Nanoclusters

Author

Prévôt, Marianne, Amela-Cortes, Maria, Manna, Sumann, Lefort, Ronan, Cordier, Stéphane, Folliot, Hervé, DUPONT, Laurent, Molard, Yann, Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Département Optique (OPT), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Institut de Physique de Rennes (IPR), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), This work has been done in the frame of ANR Clustomesogen: ANR-13-BS07–0003–01 and fond de maturation FEDER Région Bretagne.Both organisms are acknowledged. Authors wish to thank Dr. F. Artznerand C. Mériadec for SAXS measurements and Dr. F. Camerel for DSC access., ANR-13-BS07-0003,CLUSTOMESOGEN,Cristaux liquides hybrides organiques-inorganiques luminescents contenant des clusters octaédriques de métaux de transition(2013), Université de Rennes (UR)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], liquid crystals, hybrid materials, photoluminescence, electro-optic materials
Abstract

International audience; By combining [Mo6I8(C n F2n+1COO)6]2- (n = 1, 2, 3) nanocluster units with liquid crystalline ammonium cations, a new series of hybrid materials is developed that show a nematic liquid crystal phase, the most fluid of all LC phase, on a large range of temperatures including room temperature. The photophysical studies performed in the LC state show that these self-assembled hybrid materials emit in the red-NIR with absolute quantum yields up to 0.7 and show a very good photostability under continuous irradiation. They are further integrated up to 20 wt% in E7, a well-known nematic commercial LC mixture. Mixtures are investigated in terms of homogeneity and stability to select the best suitable candidate for the design of electro-controlled devices. Studies of optical switching, contrast, viscosity, and behavior toward an electrical stimulus demonstrate the high potential of these hybrid materials in the fields of photonic or optoelectronic.

Published
2015

2. Inside Back Cover: Photoluminescence: Design and Integration in Electro-Optic Devices of Highly Efficient and Robust Red-NIR Phosphorescent Nematic Hybrid Liquid Crystals Containing [Mo6I8(OCOCnF2n+1)6]2- (n = 1, 2, 3) Nanoclusters (Adv. Funct. Mater. 31/2015)

Author

Prévôt, Marianne, Amela-Cortes, Maria, Manna, Sumann K., Lefort, Ronan, Cordier, Stéphane, Folliot, Hervé, DUPONT, Laurent, Molard, Yann, Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Département Optique (OPT), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Institut de Physique de Rennes (IPR), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), ANR-13-BS07-0003,CLUSTOMESOGEN,Cristaux liquides hybrides organiques-inorganiques luminescents contenant des clusters octaédriques de métaux de transition(2013), Université de Rennes (UR)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
liquid crystals, hybrid materials, [CHIM]Chemical Sciences, photoluminescence, electro-optic materials
Abstract

International audience; As shown by L. Dupont, Y. Molard, and co-workers on page 4966, the functionalization of [Mo6I8(CnF2n+1COO)6]2− (n = 1, 2, 3) red–near-infrared phosphorescent nanocluster units with specific organic cations leads to a nematic liquid crystalline material that can be homogeneously mixed with E7 commercial liquid crystal. Integration in electro-controlled devices modulates the cluster photoluminescence intensity, demonstrating the potential of these hybrid materials for photonic or optoelectronic applications.

Published
2015

3. Lord of The Crowns: A New Precious in the Kingdom of Clustomesogens.

Author

Guy, Kevin, Ehni, Philipp, Paofai, Serge, Forschner, Robert, Roiland, Claire, Amela‐Cortes, Maria, Cordier, Stéphane, Laschat, Sabine, and Molard, Yann

Subjects
MESOGENS, INORGANIC compounds, ORGANIC compounds, OPTOELECTRONICS, NANOSTRUCTURED materials
Abstract

Abstract: Replacing pure inorganic materials by functional organic–inorganic hybrid ones to lower production costs has become a major challenge, in particular for the optoelectronic industry. Adding nanostructuration abilities meanwhile preserving homogeneity is even more challenging for this class of new materials. Here we show that red‐NIR emissive ternary molybdenum cluster salts can be assembled to liquid crystalline 15C5 crown ethers. The resulting hybrids are homogeneous and stable up to high temperature despite the weakness of the supramolecular interactions binding both components. These are illustrated by 133Cs MAS NMR. All hybrids show hexagonal columnar arrangements and strong red‐NIR emission. Surprisingly, when chlorinated clusters are used instead of brominated ones, the mesophase stability is largely enhanced. [ABSTRACT FROM AUTHOR]

Published
2018
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5. From Mesomorphic Phosphine Oxide to Clustomesogens Containing Molybdenum and Tungsten Octahedral Cluster Cores.

Author

Cîrcu, Viorel, Molard, Yann, Amela‐Cortes, Maria, Bentaleb, Ahmed, Barois, Philippe, Dorcet, Vincent, and Cordier, Stéphane

Subjects
MESOPHASES, PHOSPHINE oxides, MOLYBDENUM, TUNGSTEN compounds, TRIPHENYLPHOSPHINE, MICROSCOPY, DIFFERENTIAL scanning calorimetry
Abstract

New clustomesogens (i.e., metal atom clusters containing liquid crystalline (LC) materials) have been obtained by grafting neutral cyanobiphenyl (CB)- or cholesteryl-containing tailor-made dendritic mesomorphic triphenylphosphine oxide ligands on luminescent (M6Cli8)4+ octahedral cluster cores (M=Mo, W). The LC properties were studied by a combination of polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray powder diffraction analyses. While the organic ligands showed various mesophase types ranging from nematic, SmA columnar (SmACol), SmA, and SmC phases, it turned out that the corresponding clustomesogens formed layered phases (SmA) over a wide range of temperatures that depend on the nature and density of mesogenic groups employed. Intrinsic luminescence properties of the cluster precursors are preserved over the entire range of LC phase existence. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Design and Integration in Electro-Optic Devices of Highly Efficient and Robust Red-NIR Phosphorescent Nematic Hybrid Liquid Crystals Containing [Mo6I8(OCOC nF2 n+1)6]2− ( n = 1, 2, 3) Nanoclusters

Author

Prévôt, Marianne, Amela‐Cortes, Maria, Manna, Sumann K., Lefort, Ronan, Cordier, Stéphane, Folliot, Hervé, Dupont, Laurent, and Molard, Yann

Subjects
*NEMATIC liquid crystals, *AMMONIUM ions, *IRRADIATION, *OPTICAL switching, *PHOTONICS, *OPTOELECTRONICS, *ELECTRIC fields, *ALKALIES
Abstract

By combining [Mo6I8(C n F2 n+1COO)6]2- ( n = 1, 2, 3) nanocluster units with liquid crystalline ammonium cations, a new series of hybrid materials is developed that show a nematic liquid crystal phase, the most fluid of all LC phase, on a large range of temperatures including room temperature. The photophysical studies performed in the LC state show that these self-assembled hybrid materials emit in the red-NIR with absolute quantum yields up to 0.7 and show a very good photostability under continuous irradiation. They are further integrated up to 20 wt% in E7, a well-known nematic commercial LC mixture. Mixtures are investigated in terms of homogeneity and stability to select the best suitable candidate for the design of electro-controlled devices. Studies of optical switching, contrast, viscosity, and behavior toward an electrical stimulus demonstrate the high potential of these hybrid materials in the fields of photonic or optoelectronic. [ABSTRACT FROM AUTHOR]

Published
2015
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7. From metallic cluster-based ceramics to nematic hybrid liquid crystals: a double supramolecular approach.

Author

Nayak, Susanta K., Amela-Cortes, Maria, Roiland, Claire, Cordier, Stéphane, and Molard, Yann

Subjects
*CHARGE-charge interactions, *SUPRAMOLECULAR chemistry, *LIQUID crystals, *INORGANIC compounds, *CROWN ethers, *MASS spectrometry
Abstract

We describe a new supramolecular approach combining host–guest and electrostatic interactions to design hybrid materials containing polyanionic bulky inorganic compounds and showing liquid crystalline properties. [ABSTRACT FROM AUTHOR]

Published
2015
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8. Voltage-Driven Photoluminescence Modulation of Liquid-Crystalline Hybridized ZnO Nanoparticles.

Author

Neaime, Chrystelle, Prévôt, Marianne, Amela ‐ Cortes, Maria, Cîrcu, Viorel, Grasset, Fabien, Folliot, Hervé, and Molard, Yann

Subjects
LIQUID crystalline solvents, NANOSTRUCTURED materials, MESOGENIC groups, LUMINESCENCE, NANOCRYSTALS
Abstract

Liquid-crystalline hybrid nanomaterials have been obtained by grafting mesogenic units around luminescent ZnO nanocrystals of 5 nm in diameter. Modifying the mesogenic density around the inorganic core allows the modulation of the liquid-crystalline behavior and its miscibility in commercial liquid crystal (LC). The strong blue photoluminescence observed for the hybrids can be modulated by applying a voltage on a LC cell containing commercial LC and 10 wt % of hybrid. [ABSTRACT FROM AUTHOR]

Published
2014
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9. Liquid crystal properties resulting from synergetic effects between non-mesogenic organic molecules and a one nanometre sized octahedral transition metal clusterElectronic supplementary information (ESI) available: Experimental section; NMR, IR, UV-Vis spectra; POM pictures; DSC thermogramms; X-ray diffraction patterns. See DOI: 10.1039/c0cc05012a

Author

Mocanu, Ana S., Amela-Cortes, Maria, Molard, Yann, Cîrcu, Viorel, and Cordier, Stéphane

Subjects
*LIQUID crystals, *TRANSITION metals, *MICROCLUSTERS, *LUMINESCENCE, *LIGANDS (Chemistry), *CRYSTAL optics, *ORGANIC synthesis, *NUCLEAR magnetic resonance spectroscopy
Abstract

This work presents the synthesis and studies of a red-NIR luminescent liquid crystal compound based on an octahedral metallic cluster core orthogonally bounded to six non-mesogenic organic ligands. It evidences synergetic effects between the organic and inorganic parts of the hybrid, resulting in the generation of liquid crystal properties on cooling from the isotropic melt. [ABSTRACT FROM AUTHOR]

Published
2011
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