Abstract

Electroluminescent (EL) behavior has been evaluated in a cell that contained molecular dispersion of 1,4-bis( N, N-diphenylaminophenyl-1,3,4-oxadiazolyl)benzene (OXD) in various liquid crystals (LC); 4-hexyloxy-4′-cyanobiphenyl, 4-octyloxy-4′-cyanobiphenyl (8OCB) as low molecular-weight LCs and poly(8-(4-cyano-4′-biphenyl)-1-octanoylacrylate), poly(11-(4-cyano-4′-biphenyl)-1-undecanoylacrylate) as polymer LCs. Among the guest/host mixtures examined, the OXD/8OCB mixture showed the most stable LC phase even at the fraction of OXD up to 30 wt.%. EL emission was observed above the temperature where the OXD/8OCB mixture showed an LC phase. Furthermore, an EL device was fabricated that consisted of interdigital electrodes coated onto a glass substrate. It was found that the EL emission from the device was highly polarized.

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