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Electric Field Effects on Sensitized Fluorescence Emission From Nematic Liquid Crystal Cells |
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| Authors: | Taku Matsuo Hiroshi Nakamura Hiroshi Sakaguchi Kouji Shimomura Isamu Yoshimatsu Keisuke Takuma |
| Affiliation: | 1. Department of Organic Synthesis, Faculty of Engineering , Kyushu University 36 , Hakozaki, Fukuoka, 812, Japan;2. Department of Organic Synthesis, Faculty of Engineering , Kyushu University 36 , Hakozaki, Fukuoka, 812, Japan;3. Mitsui Toatsu Chemicals, Incorporated , Ohmuta, Fukuoka, 836, Japan |
| Abstract: | Remarkable electric field effects were observed with sensitized fluorescence intensities of a perylene derivative (BPDC), when rectangular AC waves (up to 10 V0-p ) were applied to nematic liquid crystal cells containing a sensitizer (C307 or AHDA) and an acceptor (BPDC) as the guest molecules. Measurements of the fluorescence lifetime of AHDA indicated that the rates of energy transfer from AHDA to BPDC were independent of the electric fields. The electric field effects completely changed the sign when the intensity variation detected at vertical direction was compared with that at the horizontal direction with respect to the liquid crystal cell. The observed electric field effects on the sensitized fluorescence were consequently suggested to come from the orientation control of transition dipole moment of BPDC through the molecular alignment of the liquid crystal. The suggestion was confirmed by the measurement of dichroic absorption of the donor-acceptor systems. |
| Keywords: | acoustics nematics |