It is expected that the semiconductor characteristic can be improved by using the liquid crystal property of liquid crystalline organic semiconductor material.In this report, We tried morecular orientation control of some kinds of liquid crystalline organic semiconductor material in high temperature by methods of molecular orientation control. As a result , the direction of a liquid crystal molecule was able to be made located in the one direction and how to make the direction of a molecule located in a line differs for material from polarization microscope observation and spectrum observation of fluorescence.

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Photo-alignment characteristics of polyimide films (CBDA-BAPP, PMDA-BAPP, BTDA-BAPP) exposed to linearly polarized UV radiation were studied. These three polyimides films induced uniform alignment, especially CBDA-BAPP induced an excellent uniform LC alignment. Absorption spectra and reflection spectra were measured and molecular orbital calculations were performed. From these results, effects of LPUV radiation exposed on polyimide films were investigated.

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We have previously presented a laser lithography method known as two photon excitation direct laser writing to fabricate micro-scale grating structures, and reported the dependence of the induced azimuthal anchoring energies on the height and periodicity of the grating. In this study, we report on how the anchoring strength affect the electro-optic response of nematic liquid crystals locally aligned on the micro-gratings.

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The dichroism of the fluorescence from energy acceptors (Coumarin 521 and Coumarin 540) has been investigated using UV-absorbing energy donors (BBOT and dimethyl POPOP) in 5-CB. A new parameter H which indicates the degree of depolarization of the fluorescence is introduced taking account of the anisotropy of the liquid crystal cells. Although the dependence of the dichroic ratios on the acceptor concentration is not clear, the depolarization parameter H increases with the acceptor concentration.

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