| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Meskers, Stefan C. J.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (29/29 displayed)
- 2023Origin and Energy of Intra-Gap States in Sensitive Near-Infrared Organic Photodiodescitations
- 2023Origin and Energy of Intra-Gap States in Sensitive Near-Infrared Organic Photodiodescitations
- 2021Photo-controlled alignment and helical organization in main-chain liquid crystalline alternating polymerscitations
- 2021Consequences of Chirality in Directing the Pathway of Cholesteric Helix Inversion of π-Conjugated Polymers by Lightcitations
- 2021Consequences of Chirality in Directing the Pathway of Cholesteric Helix Inversion of π-Conjugated Polymers by Lightcitations
- 2021Ultralow dark current in near-infrared perovskite photodiodes by reducing charge injection and interfacial charge generationcitations
- 2020Long-lived charge-transfer state from B−N frustrated Lewis pairs enchained in supramolecular copolymerscitations
- 2020Long-lived charge-transfer state from B−N frustrated Lewis pairs enchained in supramolecular copolymerscitations
- 2020Circularly Polarized Photoluminescence from Chiral Perovskite Thin Films at Room Temperaturecitations
- 2020On the origin of dark current in organic photodiodescitations
- 2019Impact of polymorphism on the optoelectronic properties of a low-bandgap semiconducting polymercitations
- 2018The effect of oxygen on the efficiency of planar p-i-n metal halide perovskite solar cells with a PEDOT:PSS hole transport layercitations
- 2018Bis(arylimidazole) iridium picolinate emitters and preferential dipole orientation in filmscitations
- 2017Thiophene rings improve the device performance of conjugated polymers in polymer solar cells with thick active layerscitations
- 2017Ultrafast charge and triplet state formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene blendscitations
- 2014Photoluminescence quenching in films of conjugated polymers by electrochemical dopingcitations
- 2014Effect of the fibrillar microstructure on the efficiency of high molecular weight diketopyrrolopyrrole-based polymer solar cellscitations
- 2014Relation between the electroforming voltage in alkali halide-polymer diodes and the bandgap of the alkali halidecitations
- 2012Electroforming process in metal-oxide-polymer resistive switching memories
- 2012Role of hole injection in electroforming of LiF-polymer memory diodescitations
- 2010Trapping of electrons in metal oxide-polymer memory diodes in the initial stage of electroformingcitations
- 2008Compositional and electric field dependence of the dissociation of charge transfer excitons in alternating polyfluorene copolymer/fullerene blendscitations
- 2006Synthesis and characterization of long perylenediimide polymer fibers : from bulk to the single-molecule levelcitations
- 2006Electronic memory effects in a sexithiophene - poly(ethylene oxide) block copolymer doped with NaCl. combined diode and resistive switching behaviorcitations
- 2006Triplet formation from the charge-separated state in blends of MDMO-PPV with cyano-containing acceptor polymerscitations
- 2005Exciplex dynamics in a conjugated polymer blend of MDMO-PPV and PCNEPV
- 2003Thermally induced transient absorption of light by poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonic acid) (PEDOT:PSS) films: A way to probe charge-carrier thermalization processescitations
- 2002Simulation of electrical conductivity in a pi-conjugated polymeric conductor with infrared lightcitations
- 2000Relaxation of photo-excitations in films of oligo- and poly-(para-phenylene vinylene) derivativescitations
Places of action
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article
Synthesis and characterization of long perylenediimide polymer fibers : from bulk to the single-molecule level
Abstract
The synthesis and characterization of perylenediimide polyisocyanides is reported. In addn. to short oligomers, our synthetic approach results in the formation of extremely long, well-defined, and rigid perylenediimide polymers. Ordering and close-packing of the chromophores in these long polymers is guaranteed by attachment to a polyisocyanide backbone with amino acid side chains. Hydrogen bonding interactions between those groups stabilize and rigidify the helical polymer structure. The rodlike nature of the synthesized long perylenediimide pendant polyisocyanides as well as the helical arrangement of the chromophores is demonstrated by means of at. force microscopy. Remarkably, polymer fibers up to 1 mm in length have been visualized, contg. several thousands of perylenediimide mols. CD spectroscopy reveals the chiral organization of the chromophore units in the polymer, whereas absorption and emission measurements prove the occurrence of excited-state interactions between those moieties due to the close packing of the chromophore groups. However, an intricate optical behavior is encountered in bulk as a result of the coexistence of short oligomers and long polymers of perylenediimide, a situation subsequently uncovered by means of single-mol. expts. Individual long helical perylenediimide polyisocyanides exhibit a typical red-shifted fluorescence spectrum, which, together with depolarized emission continuously decreasing in time, demonstrate that fluorescence arises from multiple excimer-like species in the polymer. Upon continuous irradn. of these long polymers, a fast decay in fluorescence lifetime is obsd., a situation explained by photoinduced creation of quenching sites. Radical/ion formation by intramol. electron transfer between close-by perylenediimide moieties is the most probable mechanism for this process. Appropriate control of the electron-transfer process might open the possibility of applying these polymers as perylenediimide-based supramol. nanowires. [on SciFinder (R)]