| 摘要 |
An electroluminescence device contains a carrier transporting layer comprising a liquid crystal compound represented by <?in-line-formulae description="In-line Formulae" end="lead"?>R-X-A-B-X'-R' (I), <?in-line-formulae description="In-line Formulae" end="tail"?> wherein A and B denote a naphthalene-2,6-diyl skeleton optionally substituted with one or two of F, Cl, Br, CH<SUB>3 </SUB>and CF<SUB>3</SUB>, at least one of A and B comprising a naphthalene-2,6-diyl skeleton having one to four CH groups replaced with N; X and X' denote -O-, -S-, -OOC- or -COO-; and one of R and R' denotes H, F, Cl, Br, CF<SUB>3 </SUB>or a linear or branched alkyl group having 1-20 carbon atoms, and the other one of R and R' denotes a linear or branched alkyl group having 3-20 carbon atoms, said alkyl groups being independently capable of including one methylene group which can be replaced with -O-, -S-, -CH-CH- or -C≡C- so long as heteroatoms are not adjacent to each other.
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