Provided is an organic electroluminescence device having high luminous efficiency, high heat resistance and an extremely long lifetime. The organic electroluminescence device of the present invention includes an organic thin film layer composed of one or more layers containing at least a light emitting layer is interposed between a cathode and an anode. The light emitting layer includes a compound containing a condensed ring and a luminescent metal complex capable of emitting light having a red-based color. It is preferable that the compound containing a condensed ring includes a host material, while the luminescent metal complex capable of emitting light having a red-based color includes a phosphorescent dopant.

Organic Electroluminescent Device

An aqueous ink composition contains at least one pigment selected from the group consisting of a condensed azo pigment, a condensed polycyclic pigment, a phthalocyanine pigment, and a nickel complex azo pigment, at least an anionic surfactant with ethylene oxide group or a nonionic surfactant with ethylene oxide group as a dispersant, a wetting agent, a penetrating agent, and water, with the ink composition having a surface tension of 20 mN/m or more and less than 35 mN/m. A yellow ink containing at least one pigment selected from the group consisting of C.I. Pigment Yellow 128, C.I. Pigment Yellow 138, C.I. Pigment Yellow 151, C.I. Pigment Yellow 97, and C.I. Pigment Yellow 150, a magenta ink containing at least one pigment of C.I. Pigment Red 122 or C.I. Pigment Violet 19, a cyan ink containing at least one pigment of C.I. Pigment Blue 15:3 or C.I. Pigment Blue 15:4, each color ink further containing a specific anionic surfactant and a water-soluble organic solvent, and a black ink containing C.I. Pigment Black 7 are used together as a set of color ink compositions for ink-jet recording.

Aqueous ink composition

An ink composition, preferably for ink jet printing, contains a liquid carrier, a colorant, and a polyalkyleneimine/alkylene oxide block copolymer, preferably polyethyleneimine/propylene oxide/ethylene oxide block copolymer, and/or a primary or secondary polyoxyalkylene amine.

Ink for ink jet printing

Disclosed is an organic electroluminescent element which is excellent with respect to luminous efficiency and driving voltage and rarely undergoes initial luminance drop. Specifically disclosed is an organic electroluminescent element which comprises, on a substrate, a pair of electrodes composed of an anode and a cathode and a light-emitting layer arranged between the electrodes, and additionally comprises at least one organic layer arranged between the light-emitting layer and the cathode, where in the light-emitting layer contains, for example, a compound (A-1), and the at least one layer arranged between the light-emitting layer and the cathode contains, for example, a compound (e-4).

Organic electroluminescent element

An aqueous ink composition contains a colorant and a humectant, and has a surface tension γ of less than 50 mN/m when measured by a maximum bubble pressure method at 25° C., with a bubble frequency ν of the aqueous ink composition being set at less than 1 Hz, and a surface tension γ of more than 40 mN/m when measured by the maximum bubble pressure method at 25° C., with the bubble frequency ν of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.

Aqueous ink composition and ink-jet printing method using the same

An ink for ink jet recording and an ink jet recording method which realize an image quality of laser printer on a plain paper in a one-pass printing mode under conditions of a volume of an ink droplet ejected being 5 to 43 Pico liter, a velocity of an ink droplet being 6 to 20 m/sec, frequency of 1 kHz and resolution of 300 dpi or more. The ink for ink jet recording is a penetrating type ink which includes (1) at least one humectant selected from glycerin, 1,3-butandiol, triethyleneglycol, 1,6-hexanediol, propyleneglycol, 1,5-pentanediol, diethyleneglycol, dipropyleneglycol, trimethylolpropane and trimethylolethane, (2) colorant contained in the amount of 6% by weight or more, (3) a polyol having 8 to 11 carbon atoms and glycolether, and an anionic surfactants or non-ionic surfactants, the ink has viscosity of 5 mPa·s or more at 25° C. and a surface tension of 40 mN/m or less.

Ink for ink jet recording, ink set for ink jet recording, method for ink jet recording, ink cartridge for ink jet recording, ink jet recording apparatus and recorded article

This invention provides an aqueous ink composition, in which the composition satisfies several requirements for properties of an ink for ink-jet printing, has a superior tone for magenta color and has an improved waterfastness. The aqueous ink composition comprises a dye, water and a huemectant, the dye comprising a dye of a general formula (I): ##STR1##

Aqueous ink and method for recording image with the aqueous ink

A sub tank is provided that includes a case at which an air flow path is formed, the air flow path including an entrance flow path portion that is connected to an ink accommodating portion of the case, and a cross flow path portion that continues from the entrance flow path portion. The cross flow path portion extends in an upper diagonal direction with respect to a reference plane corresponding to the ink liquid level at a standstill state.

Liquid container, sub tank, liquid discharge apparatus, liquid supply apparatus, and imaging apparatus

A method for recycling an image-deposited recording material having a surface portion which swells in contact with a water-containing liquid composition and bears thereon deposited images containing a thermoplastic or thermofusible image-constituting material is disclosed, which method includes the steps of applying the water-containing liquid composition to the image-deposited surface portion of the recording material to cause the surface portion of the recording material to swell more than the image-constituting material, thereby weakening the adhesion between the deposited images and the recording material; and removing the deposited images from the recording material. The image removal promoting liquid contains a wetting agent which exhibits an equilibrium moisture content of 10% or more under the ambient conditions of 60% relative humidity and 25° C.

Kaneko Tetsuya

Papers

Aqueous ink composition

Ink for ink jet recording, ink set for ink jet recording, method for ink jet recording, ink cartridge for ink jet recording, ink jet recording apparatus and recorded article

Aqueous ink and method for recording image with the aqueous ink

Liquid container, sub tank, liquid discharge apparatus, liquid supply apparatus, and imaging apparatus

Method for recycling image-deposited recording material and liquid composition for use with the recycling method