Steady-state and transient photocurrent measurements were carried out for C70-doped liquid crystalline photoconductor, 2-(4′-octylphenyl)-6-dodecyloxy-naphthalene (8-PNP-O12) in order to clarify its spectral photosensitization in visible region. The C70-doped liquid crystal cells exhibited a photoresponse in visible region of 400–700 nm 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 carrier transit. These indicated that C70 can inject both electron and hole into 8-PNP-O12 when photoexcited and does not deteriorate the carrier transport, demonstrating a possible application of liquid crystalline photoconductors to high-speed photosensors with a fast response in microseconds. © 1999 American Institute of Physics.