Discotic liquid crystals 25 years on

Current Opinion in Colloid and Interface Science

Volumn 7, Issue 5-6, 2002, Pages 343-354

  Bushby, Richard J ^a   Lozman, Owen R ^a  

^a UNIVERSITY OF LEEDS   (United Kingdom)

Author keywords

Alignment; Charge transport; Columnar; Conduction; Discotic; Liquid crystal; Mesophase; Optical compensation films; Photoconduction; Self assembly; Self organisation

Indexed keywords

CHIRALITY; CROSS LINKING; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; FILM; HYBRID; LIQUID CRYSTAL; MOLECULAR INTERACTION; OPTICAL INSTRUMENTATION; PHYSICAL CHEMISTRY; POLYMER PRODUCTION; POLYMERIZATION; REVIEW; TECHNOLOGY;

EID: 0036866836     PISSN: 13590294     EISSN: None     Source Type: Journal    
DOI: 10.1016/S1359-0294(02)00085-7     Document Type: Review

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75. h phase. The technique is quite simple and presumably widely applicable. It would be nice to see further examples.
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86. -1.
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90. 10) for HHTT/TNF.
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92. Kreouzis T, Donovan KJ, Boden N, Bushby RJ, Lozman OR, Liu Q. Temperature-independent hole mobility in discotic liquid crystals. J Chem Phys 2001;114:1797-1802.
93. Mery S, Haristoy D, Nicoud JF et al. Bipolar carrier transport in a lamello-columnar mesophase of a sanidic liquid crystal. J Mater Chem 2002;12:37-41. A rare case in which both electron and hole mobilities have been measured. They are of similar magnitudes.
94. Bushby RJ, Evans SD, Lozman OR, McNeill A, Movaghar B. Enhanced charge conduction in discotic liquid crystals. J Mater Chem 2001;11:1982-1984. Further work is in progress. We have discovered that examples of rather similar effects were known in calamitic systems.
95. Wegewijs BR, Siebbeles LDA, Boden N et al. Charge-carrier mobilities in binary mixtures of discotic triphenylene derivatives as a function of temperature. Phys Rev B 2002;65:245112. Despite the fact that the ionisation energies of the two components in these CPI discotics differ by 0.5 eV the in-column hole mobility is remarkably high. It is suggested that the energy difference is compensated for by a large overlap integral.
96. Pecchia A, Lozman OR, Movaghar B et al. Photoconductive transients and one-dimensional charge-carrier dynamics in discotic liquid crystals. Phys Rev B 2002;65 art. no.-104204.
97. Boden N, Bushby RJ, Clements J, Movaghar B. Device applications of charge transport in discotic liquid crystals. J Mater Chem 1999;9:2081-2086.
98. Schmidt-Mende L, Fechtenkotter A, Mullen K, Moons E, Friend RH, MacKenzie JD. Self-organized discotic liquid crystals for high-efficiency organic photovoltaics. Science 2001;293:1119-1122. Based on a layered hexabenzocorenene /perylene layered structure.
99. Seguy I, Destruel P, Bock H. An all-columnar bilayer light-emitting diode. Synthet Met 2000;111:15-18. ITO/HAT4/tetraethylperylene carboxylate/Al. The HAT acts as the hole and the perylene as the electron transporter.
100. D phase with a chiral dopant.
101. Van de Witte P, Stallinga S, Van Haaren J. Viewing angle compensators for liquid crystal displays based on layers with a positive birefringence. Jpn J Appl Phys Part 1 - Regular Papers Short Notes Rev Papers 2000;39:101-108. A theoretical alternative to the Fuji technology.
102. Leenhouts F. Wide viewing angle active matrix liquid crystal displays based on a single discotic compensation film. Jpn J Appl Phys Part 2 - Lett 2000;39:L741-L743.
103. Lu MH, Yang KH. Low voltage and wide-viewing-angle twisted nematic liquid crystal displays by optical compensation. Jpn J Appl Phys Part 2 - Lett 2000;39:L412-L415.
104. Wu LH, Luo SJ, Hsu CS, Wu ST. Obliquely tilted discotic phase compensation films. Jpn J Appl Phys Part 2 - Lett 2000;39:L869-L871.
105. Sergan TA, Jamal SH, Kelly JR. Polymer negative birefringence films for compensation of twisted nematic devices. Displays 1999;20:259-267.