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The schematic illustrations of three sample configurations for TOF studies of E4: the amorphous film, the homogeneously (horizontally) aligned LC glass film, and the homeotropically (vertically) aligned LC glass film.
(a) Photo of a micrometer thick E4 sample (sandwiched between two glass/polyimide slides) taken under the polarized microscope when right heated to . (b) Photo of the vertically aligned LC cell of E4 taken under the polarized microscope at . (c) Photo of the sample in (b) taken after rapidly cooling to room temperature.
The transmission (measured with the He–Ne laser, ) of the vertically aligned E4 cell sandwiched between two crossed polarizers as a function of the in-plane rotation angle. Insets: the molecular structure of E4.
Representative TOF transients for the vertically aligned E4 sample : (a) hole, and (b) electron, . The insets of (a) and (b) are double logarithmic plots of (a) and (b), respectively.
(a) Hole mobilities and (b) electron mobilities vs for E4 in the amorphous state, the homogeneously aligned LC glass state, and in the homeotropically aligned LC glass state.
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