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New Aspects of Organic Electric Materials in Calamitic Liquid Crystalline Photoconductors

Published online by Cambridge University Press:  21 March 2011

Hiroki Maeda ,
Masahiro Funahashi  and
Jun-Ichi Hanna
Hiroki Maeda
Affiliation:
Image Science & Engineering Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta Midori-ku, Yokohama, 226-8503, JAPAN
Masahiro Funahashi
Affiliation:
Central Research Institute, Dai Nippon Printing Co., Ltd. 250-1 Wakashiba Kashiwa-shi, Chiba-ken 277-0871, JAPAN
Jun-Ichi Hanna
Affiliation:
Central Research Institute, Dai Nippon Printing Co., Ltd. 250-1 Wakashiba Kashiwa-shi, Chiba-ken 277-0871, JAPAN
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Abstract

Calamitic liquid crystalline photoconductors such as 2-(4'-octylphenyl)-6-butyloxynaphthalene (8-PNP-O4) and 2-(4'-octylphenyl)-6-dodecyloxynaphthalene (8-PNP-O12) exhibit fast ambipolar carrier transport in all the smectic mesophases up to 1.0 × 10−2 cm2/Vs. The structural defects of liquid crystals, i.e. domain boundaries and disclinations in domains, are electrically inactive and cause neither shallow nor deep defect states due to their fluid nature. It is illustrated that the carrier transport does not suffer from these structural defects in polydomain, by examining transient photo-currents in very thick liquid crystalline layers over 100μm. With an insight that this allowance of the polydomain structure and the fluidity of liquid crystalline photoconductors provides us new aspects in terms of electric property and application, e.g. multi-gap processing, the position detect sensor is demonstrated in a wedge cell filled of 8-PNP-O12, referring the position sensitive transit time of photo-induced transient current.

The present result indicates that the photoconductive liquid crystalline material is available for multi-gap structured devices.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 598: Symposium BB – Electrical, Optical, & Magenetic Properties...V , 1999 , BB3.61
Copyright
Copyright © Materials Research Society 1999

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