37results about "Benzathrone dyes" patented technology

Disclosed is an organic EL element (1)-which is provided with a counter electrode (6), an organic light-emitting layer (5), and a transparent electrode (4) on a translucent substrate (2)-wherein: a light extraction layer (3), of which a high refractive index layer (31) adjacent to the transparent electrode (4) and a low refractive index layer (32) adjacent to the translucent substrate (2) are stacked, has a plurality of irregular-section units (31A) configured from convex sections (311) and concave sections (312) at the interface of the high refractive index layer (31) and the low refractive index layer (32); in at least one of the plurality of irregular-section units (31A), the distance (d1) from the interface between the high refractive index layer (31) and the low refractive index layer (32) to the interface between the transparent electrode (4) and the high refractive index layer (31) is at least the optical coherence length; and the height (d2) of the convex sections (311), the width (d3) of the convex sections (311), and the spacing (d4) between each convex sections (311) and the adjacent convex sections (311) with concave sections (312) therebetween is at least 1 [mu]m.

The present invention relates to organic electroluminescent compounds represented by Chemical Formula 1 or 2, a process for preparing the same, and an organic light emitting diode (OLED) which comprises, as a luminescent region interposed between an anode and a cathode, at least one compound (s) selected from those represented by Chemical Formula 1 or 2, and at least one compound selected from anthracene derivatives, benz[a]anthracene derivatives and naphthacene derivatives. The electroluminescent compound according to the present invention is a green electroluminescent compound having maximized electroluminescent efficiency and lifetime of device.

The invention relates to the compounds of formula (1) and to organic electroluminescent devices, in particular blue-emitting devices, in which said compounds are used as the host material or doping agent in the emitting layer and / or as the hole transport material and / or as the electron transport material.

A benzanthracene derivative having hydrogen atom at the 12-position, and an organic electroluminescence device having an organic thin film layer, which has one layer or a plurality of layers including at least a light emitting layer, is disposed between a cathode and an anode and contains the benzanthracene derivative in at least one layer in the organic thin film layer singly or as a component of a mixture. The electroluminescence device provides a great efficiency of light emission, has a long life and exhibits an excellent chromaticity.

A superfine kaolin flake material is prepared through mixing potassium acetate as sandwich agent with kaolin grinding, intercalating, laying aside, water washing, centrifugal separating of patassium acetate, stripping kaolin flakes, baking and grinding. Its advantages are high intercalating rate and slake-stripping effect, and low cost.

An organic EL device comprises: a light-transmissive substrate; a transparent electrode; an organic emitting layer; and an opposing electrode. A light-extraction layer provided by layering a high refractive index layer adjoining the transparent electrode and a low refractive index layer adjoining the light-transmissive substrate includes recess-protrusion units each provided by a protrusion and a recess at an interface between the high refractive index layer and the low refractive index layer. In at least one of the recess-protrusion units, a distance from the interface between the high refractive index layer and the low refractive index layer to an interface between the transparent electrode and the high refractive index layer is equal to or more than an optical coherence length and a height of the protrusion, a width of the protrusion and a gap between the protrusion and another protrusion adjoining the protrusion across the recess is 1 μm or more.