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Proceedings Paper

Photosensitization of smectic photoconductive liquid crystal by C70 doping
Author(s): Hong Zhang; Masahiro Funahashi; Jun-ichi Hanna
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Paper Abstract

The spectral sensitization and photosensitizer efficiency of a liquid crystalline photoconductor, 2-(4'-octylphenyl)-6- dodecyloxy-naphthalene (8-PNP-O12) with C70 were investigated by steady-state and transient photocurrent measurements in terms of temperature, electric field, and doping concentration of C70. The C70-doped liquid crystal cell exhibited a photoresponse in visible region of 400-700nm corresponding to the optical absorption of C70. In the time-of-flight measurement, the fast transient photosignals with fast rise and decay on the order of microseconds were obtained even in a bulk excitation condition, which is governed by the ambipolar carrier transit. In visible region, the same photogeneration efficiency for hole and electron indicated that C70 can inject both electron and hole into 8-PNP-O12 when photoexcited. The phase transition temperature did not change by doping C70 but the phase transition was found to have a great influence to the photogeneration yield. In the high ordering SmB phase, the photosensitization yield was found to be about two orders larger than that in the low ordering SmA phase and isotropic phase, where different interaction of C70 was obvious in optical absorption and texture is under polarized microscope.

Paper Details

Date Published: 19 May 2000
PDF: 9 pages
Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000); doi: 10.1117/12.386367
Show Author Affiliations
Hong Zhang, Tokyo Institute of Technology (Japan)
Masahiro Funahashi, Tokyo Institute of Technology (Japan)
Jun-ichi Hanna, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 3939:
Organic Photonic Materials and Devices II
Donal D. C. Bradley; Bernard Kippelen, Editor(s)

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