A new mechanism for space-charge field formation in photorefractive liquid-crystal composites containing poly(2,5-bis(2‘-ethylhexyloxy)-1,4-phenylenevinylene) (BEH-PPV) and the electron acceptor N,N‘-dioctyl-1,4:5,8-naphthalenediimide, NI, is observed. The results show that charge migration over long distances leading to enhanced photorefractive effects can be obtained using conjugated polymers dissolved in liquid crystals.
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Wiederrecht et al. (1999) studied this question.
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