摘要:
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sup.1 and R.sup.2 respectively denote a linear or branched alkyl group having 1-18 carbon atoms capable of including one or two or more non-neighboring methylene groups which can be replaced with at least one species of --Z--, ##STR2## --CH.dbd.CH-- and --C.tbd.C--, wherein Z denotes --O-- or --S-- and R.sup.3 denotes hydrogen or an alkyl group having 1-5 carbon atoms; A.sup.1 denotes ##STR3## and A.sup.2 denotes any one of ##STR4## The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed.
摘要:
A liquid crystal composition, comprising: at least one compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 respectively denote an optically inactive linear or branched alkyl group having 1-18 carbon atoms capable of including one or non-neighboring two or more methylene groups which can be replaced with at least one species of ##STR2## wherein Z denotes --O-- or --S-- and R.sub.3 denotes hydrogen or an alkyl group having 1-5 carbon atoms; A denotes --A.sub.1 -- or --A.sub.2 --A.sub.3 -- wherein A.sub.1 denotes ##STR3## and A.sub.2 and A.sub.3 respectively denote ##STR4## or --A.sub.1 --; and at least one compound represented by the following formula (II): ##STR5## wherein R.sub.4 denotes a linear or branched alkyl group having 1-18 carbon atoms capable of having a substituent; X.sub.1 denotes a single bond, --O--, ##STR6## X.sub.2 denotes a single bond, --O-- or ##STR7## Z.sub.1 denotes a single bond or ##STR8## A.sub.4 denotes ##STR9## and l is 1-12.
摘要:
This invention relates to an electrophotographic photosensitive member utilizing a novel electrophotographic photosensitive material, more particularly to an electrophotographic photosensitive member endowed with high sensitivity as well as excellent potential stability during repeated copying by incorporating an azo pigment having a specific molecular structure in the photosensitive layer.
摘要:
A metal coordination compound represented by the formula: An organic luminescence device including an anode, a cathode, and an organic layer, which contains the metal coordination compound, disposed between the anode and the cathode.
摘要:
A light-emitting device is provided which uses an organic compound to emit light with high luminance and extremely high efficiency. The organic compound is composed of a metal complex having monovalent bidentate ligands. The light-emitting device includes a pair of electrodes which are an anode and a cathode, and plural organic compound layers interposed between the electrodes, in which at least one layer of the organic compound layers contains a metal complex represented by the following structural formula. The light-emitting device is an organic electroluminescent device using the light-emitting device in which the layer including the organic compound is a light-emitting layer.
摘要:
There is provided a green-light-emitting device which has a high emission efficiency and a long continuous operational life, and which includes a pair of electrodes including an anode and a cathode; and a layer including an organic compound disposed between the pair of electrodes, wherein the layer includes a first compound represented by the general formula (I): wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 each represent, independently of one another, a hydrogen atom, an alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, or a halogen atom; and a second compound with a pyrene skeleton or a fluorene skeleton having an energy gap larger than an energy gap of the first compound.
摘要:
A light emitting device comprises a pair of electrodes and an organic light emitting layer between the electrodes. The organic light emitting layer includes a host material, a first phosphorescent dopant, and a second dopant different from the first phosphorescent dopant. The amount of the second dopant is greater than the amount of the first dopant in the organic light emitting layer. The host material, the first phosphorescent dopant and the second dopant are mixed throughout the organic light emitting layer.
摘要:
Provided is an organic light emitting device including: a pair of electrodes including an anode and a cathode; and at least one layer formed of an organic compound interposed between the pair of electrodes, in which the at least one layer formed of the organic compound layer contains at least one kind of the carbazole derivative represented by the following general formula (I). The organic light emitting device has an optical output with extremely high efficiency and a high luminance and has an extremely high durability.
摘要:
A layer is spaced between an anode and a cathode and is composed of an organic compound represented by the following general formula [1]. wherein R1 to R10 are each independently a hydrogen atom, a halogen atom, a substituted amino group, an alkyl group, an aryl group, and a heterocyclic group; and X represents (a) an alkylene group having 2 to 6 carbon atoms, wherein in the alkylene group, one or separate two methylene groups may be substituted by —O—, —CO—, —CO—O—, —S—, or —NRa1—, and a hydrogen atom may be substituted by a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms, (b) an aryl group which may be substituted, or (c) a heterocyclic group which may be substituted, or (d) a fluorine atom.