Photosensitization of smectic photoconductive liquid crystal by C70 doping

Hong Zhang; Masahiro Funahashi; Jun-ichi Hanna

doi:10.1117/12.386367

19 May 2000 Photosensitization of smectic photoconductive liquid crystal by C₇₀ doping

Hong Zhang, Masahiro Funahashi, Jun-ichi Hanna

Proceedings Volume 3939, Organic Photonic Materials and Devices II; (2000) https://doi.org/10.1117/12.386367
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

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.

Citation Download Citation

Hong Zhang, Masahiro Funahashi, and Jun-ichi Hanna "Photosensitization of smectic photoconductive liquid crystal by C₇₀ doping", Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000); https://doi.org/10.1117/12.386367

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