摘要:
An organic EL device includes a luminescence layer containing, as a luminescent material allowing a high-luminescence and high-efficiency luminescence for a long period of time, a metal coordination compound represented by the following formula (1): LmML'n, wherein M denotes Ir, Pt, Ph or Pd; L denotes a bidentate ligand; L' denotes a bidentate ligand different from L; m is an integer of 1, 2 or 3; and n is an integer of 0, 1 or 2 with the proviso that the sum of m and n is 2 or 3. The partial structure MLm is represented by a formula (2) or a formula (3) shown below, and the partial structure ML'n is represented by a formula (4) or a formula (5) shown below:
wherein CyN1, CyN2 and CyN3 independently denote a substituted or unsubstituted cyclic group containing a nitrogen atom connected to M; CyN4 denotes a cyclic group containing 8-quinoline or its derivative having a nitrogen atom connected to M; CyC1, CyC2 and CyC3 independently denote a substituted or unsubstituted cyclic group containing a carbon atom connected to M, with the proviso that the metal coordination compound is represented by the formula (2) when n is 0.
摘要:
A luminescence device is principally constituted by a pair of electrodes and an organic compound layer disposed therebetween. The organic compound layer contains a metal coordination compound characterized by having a partial structure represented by the following formula (1): wherein each of N and C represents an atom constituting a cyclic group.
摘要:
A driving method for a liquid crystal device of the type comprising a pair of oppositely disposed substrates each provided with an electrode, a chiral smectic liquid crystal disposed between the substrates to form a plurality of pixels and to be placed in a monostable state under no voltage application, and a plurality of active elements each of which is provided to an associated pixel and is connected with an associated electrode so as to effect a matrix drive of the liquid crystal device includes a step of driving the liquid crystal device so that the liquid crystal is tilted from the monostable state to provide a maximum tilt angle in actual drive smaller than a saturation tilt angle. The drive method is effective in suppressing burning or alignment state change of the chiral smectic liquid crystal, thus improving display characteristics.
摘要:
A ferroelectric chiral smectic liquid crystal composition, comprising: at least one compound represented by the following formula (I): wherein R 1 and R 2 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent of C 1 - C 12 alkoxy group; X 1 and X 2 respectively denote a single bond, -0-, at least one compound represented by the following formula (II): wherein R 3 and R4 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capablg of having a substituent; X 3 and X 4 respectively denote a single bond, Z 1 denotes - -CH 2 0-, -OCH 2 - or a single bond; respectively denote denotes with proviso that at least one of and at least one compound represented by the following formula (III): wherein R s denotes a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent; Xs denotes a single bond, Z 2 denotes a single bond or - and m is 1-12.
摘要:
A ferroelectric chiral smectic liquid crystal composition, comprising at least one compound represented by the following formula (I): wherein R, denotes a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent, R 2 denotes a linear or branched alkyl group having 1 - 14 carbon atoms capable of having a substituent; X 1 and X 2 respectively denote a single bond, -0-, m is 0 - 7; and n is 0 or 1; and at least one compound represented by the following formula (II): wherein R 3 denotes a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent; R 4 denotes a linear alkyl group having 1 -10 carbon atoms; X 3 denotes a single bond, -O- , Y denotes - CH 2 0-or -OCH 2 -; and respectively denote