Very high time-of-flight mobility in the columnar phases of a discotic liquid crystal

Iino, Hiroaki; Hanna, Jun‐ichi; Bushby, Richard J.; Movaghar, B.; Whitaker, Benjamin J.; Cook, Michael J.

doi:10.1063/1.2056608

Cited by 157 publications

(112 citation statements)

References 26 publications

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“…Für Anwendungen sind jedoch eine Langzeitstabilität der Mesophase sowie eine leichte Ausrichtung höchst wünschenswert. [200] Ino et al [202] konnten aufgrund der weitreichenden homöotropen Orientierung der Säulen die Lochbeweglichkeit für 1,4,8,11,15,18 [203] Die Molekülanordnung besteht aus zwei Phasen, in denen die Moleküle flach aufliegen ("face-on"), und einer lamellaren Phase ("edge-on"). In organischen Lösungsmitteln bildet 104 ein Gel, in dem helicale Fasern vorliegen.…”

Section: Phthalocyanine Und Porphyrineunclassified

Diskotische Flüssigkristalle: Von der maßgeschneiderten Synthese zur Kunststoffelektronik

et al. 2007

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Die meisten Menschen verbinden mit dem Begriff Flüssigkristalle sofort die Displays von Laptop‐Computern, Mobiltelefonen, Digitalkameras und anderen elektronischen Geräten. Im Unterschied zu ihren stäbchenförmigen (calamitischen) Verwandten, die erstmals 1907 von Vorländer beschrieben wurden, bieten aber die 1977 von Chandrasekhar entdeckten scheibenförmigen (diskotischen) Flüssigkristalle andere vielversprechende Verwendungsmöglichkeiten. Ihre einzigartige Anordnung in columnaren Mesophasen macht sie zu idealen Kandidaten für molekulare Drähte in vielen optischen und elektronischen Geräten, beispielsweise in Photokopierern, Laserdruckern, Solarzellen, organischen Leuchtdioden und Feldeffekttransistoren oder zur holographischen Datenspeicherung. Einer Übersicht über die verschiedenen Mesophasentypen und Charakterisierungsmethoden columnarer Flüssigkristalle folgen ausgewählte Beispiele aus den Hauptklassen columnarer Mesogene unter besonderer Berücksichtigung effizienter Syntheseverfahren, mesomorpher Eigenschaften und der für Anwendungen relevanten physikalischen Eigenschaften der Flüssigkristalle. Abschließend werden Anwendungsbeispiele und Perspektiven für einen Einsatz in den Materialwissenschaften und der molekularen Elektronik vorgestellt.

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Section: Phthalocyanine Und Porphyrineunclassified

Diskotische Flüssigkristalle: Von der maßgeschneiderten Synthese zur Kunststoffelektronik

et al. 2007

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“…6 In a developing area, a number of Pcs that exhibit liquid crystal properties show enhanced semiconducting behaviour in the temperature range where the liquid crystal state (mesophase) occurs. [7][8][9][10] Simon et al discovered the first liquid crystalline Pcs in 1982, 11 so adding new examples to the then recently identified class of so-called 'discotic' liquid crystals. Discotic liquid crystals typically possess near planar (often aromatic) cores and bear a number of paraffinic chains.…”

Section: Introductionmentioning

confidence: 99%

Design and synthesis of liquid crystalline phthalocyanines: combinations of substituents that promote the discotic nematic mesophase

et al. 2015

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Graphical AbstractDesign and synthesis of liquid crystalline phthalocyanines: combinations of substituents that promote the discotic nematic mesophase AbstractA homologous series of fourteen metal-free 1,4,8,11,15,18-hexakis(alkyl)-22-methyl-25-hydroxyalkylphthalocyanine derivatives has been investigated to interogate the interlay of the roles of the six alkyl chains and the length of the hydroxyalkyl chain in promoting thermotropic nematic liquid crystalline behavior. All but two of the compounds form mesophases. Eight of the remaining compounds exhibit only columnar mesophases which is common among liquid crystalline phthalocyanines. However, four examples form the rare discotic nematic mesophase. A general structural feature is deduced in that this rare phase is favoured when the number of linking atoms in the hydroxyalkyl chain exceeds twice the number of carbon atoms in any one of the six common alkyl chains, disrupting the columnar packing arrangement. In addition, zinc and copper metallated examples of one of the metal-free discotic nematic compounds were prepared of which the zinc metallated compound formed a nematic phase whereas the copper containing analogue favoured columnar mesophase formation.

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“…Discotic liquid crystals (DLCs) [1] are a class of liquid crystals proposed for many applications in organic electronics [2][3][4][5], including organic field effect transistors (OFETs) [6,7], in photovoltaics [8][9][10], as sensors [11,12] and in information storage [12]. DLCs are formed by a rigid aromatic core and highly flexible peripheral chains, which provide solubility and drive self-organizing properties of these materials in columns forming different mesophases [13,14].…”

Section: Introductionmentioning

confidence: 99%

Doping and photo-induced current in discotic liquid crystals thin films: Long-time and temperature effects

Calò¹,

Stoliar²,

Cavallini³

et al. 2011

Organic Electronics

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tHere we address the problem of time and temperature instability of the electrical current related to parasitic doping effects in discotic liquid crystals (DLCs). We investigated the electrical transport in thin films of a phthalocyanine-based DLC in-dark and upon laser irradiation during long thermal cycles. Measuring the electrical transport between two electrodes we observed that in-dark the current is mostly due to doping levels while, upon laser irradiation, the photocurrent reflects the diffusion length of the photogenerated charge carriers and it is limited by the coherence length of a column. We prove here that the two contributions are completely independent. Our result experimentally supports the theoretical studies performed at the molecular level on discotic liquid crystals.

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Very high time-of-flight mobility in the columnar phases of a discotic liquid crystal

Cited by 157 publications

References 26 publications

Diskotische Flüssigkristalle: Von der maßgeschneiderten Synthese zur Kunststoffelektronik

Diskotische Flüssigkristalle: Von der maßgeschneiderten Synthese zur Kunststoffelektronik

Design and synthesis of liquid crystalline phthalocyanines: combinations of substituents that promote the discotic nematic mesophase

Doping and photo-induced current in discotic liquid crystals thin films: Long-time and temperature effects

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