New fluorine-containing ferroelectric liquid crystal compounds showing tristable switching

Y. Suzuki Central Research and Development Laboratory, Showa Shell Sekiyu Co. Ltd., 123-1 Shimokawairi, Atsugi-shi, Kanagawa-ken, 243-02, Japan

T. Hagiwara Central Research and Development Laboratory, Showa Shell Sekiyu Co. Ltd., 123-1 Shimokawairi, Atsugi-shi, Kanagawa-ken, 243-02, Japan

I. Kawamura Central Research and Development Laboratory, Showa Shell Sekiyu Co. Ltd., 123-1 Shimokawairi, Atsugi-shi, Kanagawa-ken, 243-02, Japan

N. Okamura Department of Bioengineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

T. Kitazume Department of Bioengineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

M. Kakimoto Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Y. Imai Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Y. Ouchi Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

H. Takezoe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

A. Fukuda Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

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Abstract

To understand the real cause of stabilization of the third state and to assure the possible application of the tristable switching, we have studied the effect of chiral centers on the appearance of the third state, synthesizing (R)-(+)- and (S)-(–)-4-(1-trifluoromethylalkoxy(n)carbonyl) phenyl 4′-alkoxy(m)biphenyl-4-carboxylate

where m = 8, 9, 10, or 12 and n = 6 or 8; note that the chiral centre has a trifluoromethyl group. By observing light transmittance and switching current responses to a triangular voltage wave and by taking stroboscopic micrographs, we have confirmed that all the materials synthesized show the tristable switching in wide temperature ranges; in particular, the materials with m = 10 or 12 and n = 6 have the stabilized third state even at temperatures below 30°C.

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New fluorine-containing ferroelectric liquid crystal compounds showing tristable switching

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New fluorine-containing ferroelectric liquid crystal compounds showing tristable switching

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