Abstract: A fluorene compound represented by the following general formula [I]: is used to provide an organic luminescent device. Such a device has an optical output exhibiting a high luminance with an extremely high efficiency, and has an extremely high durability.

Abstract: An inkjet recording ink is composed of an encapsulated water-insoluble colorant encapsulated with a high-molecular dispersant, a water-soluble organic solvent, and water. The water-insoluble colorant is at least one colorant selected from the group consisting of C.I. Solvent Yellow 21, 42, 79, 82, 83:1, 88 and 151, at least one colorant selected from the group consisting of C.I. Solvent Red 8, 49, 83:1, 91, 127 and 218, at least one colorant selected from the group consisting of C.I. Solvent Black 3, 27, 29 and 45, or at least one colorant selected from the group consisting of C.I. Solvent Blue 25, 38, 44, 67 and 70. The high-molecular dispersant is a block copolymer comprising at least one hydrophobic block and at least one hydrophilic block, which have been obtained by polymerizing vinyl ethers as monomers, respectively. The inkjet recording ink can stably record images of high fastness and excellent quality over a long period even under severe environmental conditions.

Abstract: A fluorene compound represented by the following general formula [I]: 1

Abstract: A recording medium is composed of a base material and an ink-receiving layer arranged on a surface of the base material.

Abstract: A photosensitive member for electrophotography, including an electroconductive substrate and a photosensitive layer disposed thereon, wherein the photosensitive layer comprises a triarylamine compound represented by the following general formula (I): wherein Ar.sub.4 and Ar.sub.5 respectively denote a benzene ring or aromatic fused-ring hydrocarbon group capable of having a substituent; R.sub.1 and R.sub.2 respectively denote a hydrogen atom, alkyl, alkoxyl or halogen atom; and at least one of Ar.sub.4 and Ar.sub.5 is an aromatic fused-ring hydrocarbon group.

Abstract: An electrophotographic photosensitive member comprises a conductive support and a photosensitive layer provided thereon. The photosensitive layer contains a fluorene compound represented by the following Formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represent an alkyl group; R.sub.3 represents a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom; R.sub.4 and R.sub.5 each represent a hydrogen atom, an alkyl group, an aralkyl group or an aryl group.

Abstract: A photosensitive member for electrophotography, comprising an electroconductive substrate and a photosensitive layer disposed thereon, wherein the photosensitive layer comprises a pyrene compound represented by the following general formula (I): ##STR1## wherein Ar.sub.1 and Ar.sub.2 respectively denote and aromatic hydrocarbon group capable of having a substituent, or an aromatic heterocyclic group capable of having a substituent.

Abstract: A photosensitive member for electrophotography, including an electroconductive substrate and a photosensitive layer disposed thereon, wherein the photosensitive layer comprises a substituted amino compound represented by the following general formula (I): ##STR1## wherein X denotes --O--, --S--, or ##STR2## R.sub.1 denotes a hydrogen atom, alkyl, alkoxyl or halogen atom; and R.sub.2, R.sub.3 and R.sub.4 respectively denote an alkyl, aralkyl, aryl or heterocyclic group.