Semiconductor Energy Laboratory Co., Ltd.

Atsushi Tokuda

Satoshi Seo

Ryoji Nomura

Hideko Inoue

Tetsuo Tsutsui

Hiroko Yamazaki

Hiroko Abe

Satoko Shitagaki

Masakazu Egawa

Yasuo Nakamura

Takako Takasu

Shunpei Yamazaki

Ryota Tajima

Tamae Takano

A triplet light emitting device which has high efficiency and improved stability and which can be fabricated by a simpler process is provided by simplifying the device structure and avoiding use of an unstable material. In a multilayer device structure using no hole blocking layer conventionally used in a triplet light emitting device, that is, a device structure in which on a substrate, there are formed an anode, a hole transporting layer constituted by a hole transporting material, an electron transporting and light emitting layer constituted by an electron transporting material and a dopant capable of triplet light emission, and a cathode, which are laminated in the stated order, the combination of the hole transporting material and the electron transporting material and the combination of the electron transporting material and the dopant material are optimized.

Light emitting device containing iridium complex

A quinoxaline derivative represented by a formula (1) is provided. In the formula (1), Rand Rand Rand Rare bonded to each other to form an aromatic ring, and Arto Areach independently represents an aryl group or a heterocyclic group. 

Quinoxaline derivative, and organic semiconductor device, electric field light emitting device, and electronic device which have the same

Light emitting device

A method for manufacturing a display device of the present invention comprises the steps of forming insulating barriers which surround electrode and project upward from the surface of the electrode, and bringing the whole substrate into contact with water after applying the solution including an acceptor in wet process. According to the present invention, an organic conductive layer can be uniformly formed over a substrate in wet process even if the substrate does not have a smooth surface and has distribution in wettability of the surface.

Manufacturing method of display device

It is an object to provide a new substance excellent in electron-transporting property, and a light-emitting element and a light-emitting device using the substance. A quinoxaline derivative represented by the general formula (G1) is provided. In the general formula (G1), each of Rto Rrepresents hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 25 carbon atoms; and each of Arand Arrepresents an aryl group having 6 to 25 carbon atoms. Such a quinoxaline derivative is excellent in electron-transporting property and very effective as an electron-transporting material in a light-emitting element and the like. 

Quinoxaline derivative, light-emitting element, light-emitting device, and electronic appliance

Target is to provide an organic compound material having a bipolar character. A quinoxaline derivative represented by a general formula (1) is provided. In the formula, R-Reach independently represents a hydrogen atom, a halogen atom, a lower alkyl group, an alkoxy group, an acyl group, a nitro group, a cyano group, an amino group, a dialkylamino group, a diarylamino group, a vinyl group, an aryl group, or a heterocyclic residue group. Rand R, Rand R, and Rand Rare each independent or respectively mutually bonded to form an aromatic ring. Ar-Areach independently represents an aryl group or a heterocyclic residue group. Ar, Ar, Arand Arare each independent or Arand Ar, and Arand Arare respectively mutually bonded directly, or Arand Ar, and Arand Arare bonded via oxygen (O), sulfur (S) or a carbonyl group. 

According to the present invention, a light-emitting element, a light-emitting device, and a lighting system, each of which has a broad spectrum like sunlight and has high color rendering properties, can be obtained. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula (1): wherein R1 to R4 are individually hydrogen or an alkyl group having 4 carbon atoms (a straight-chain structure or a branch structure).

Light emitting element, light emitting device, and lighting system

An object is to provide a nonvolatile semiconductor memory device which is excellent in a writing property and a charge retention property. In addition, another object is to provide a nonvolatile semiconductor memory device capable of reducing writing voltage. A nonvolatile semiconductor memory device includes a semiconductor layer or a semiconductor substrate including a channel formation region between a pair of impurity regions that are formed apart from each other, and a first insulating layer, a plurality of layers formed of different nitride compounds, a second insulating layer, and a control gate that are formed in a position which is over the semiconductor layer or the semiconductor substrate and overlaps with the channel formation region.

Nonvolatile semiconductor memory device

An object is to provide a novel organic compound capable of visible light emission. In particular, an object is to provide a novel organic compound that exhibits a broad emission spectrum when it is used for a light-emitting element. In addition, an object is to provide a light-emitting element and a light-emitting device that gives white light emission with an excellent color rendering property. The quinoxaline derivative represented by General Formula (1) is provided. Since the quinoxaline derivative represented by General Formula (1) is capable of emitting visible light, it can be favorably used for a light-emitting element. In particular, since the quinoxaline derivative represented by General Formula (1) exhibits a broad emission spectrum when it is used for a light-emitting element, by using it for a light-emitting element a light-emitting element that gives white light emission with an excellent color rendering property can be obtained. 

Quinoxaline derivative, and light-emitting element and light-emitting device using quinoxaline derivative

A chelate complex having as its central metal tungsten which is an inexpensive metal and which is a heavy atom is applied to an organic light emitting element, thereby obtaining an organic light emitting element capable of converting the triplet excitation energy into light emission. By applying the organic light emitting element using this metal complex, an inexpensive light emitting device which is bright but consumes little power can be provided as well as an electric appliance using the light emitting device.

Organic light emitting element and light emitting device using the same

A light-emitting organic compound that is superior in electrochemical stability, chemical stability, and thermal stability is provided. The compound also, shows blue luminescence with favorable color purity, and is represented by the following general formula (). In the formula, Xrepresents a silyl group in which one or more aryl groups having 5 to 10 carbon atoms are bound to silicon or an alkyl group having 1 to 4 carbon atoms. Arrepresents an unsubstituted or substituted aryl group having 5 to 15 carbon atoms. Arrepresents an aryl group having 5 to 20 carbon atoms, and may have a substituent at a site different from a binding site to ArX&#x2014;Ar&#x2014;Ar&#x2003;&#x2003;(1)

Light-emitting organic compound and light-emitting element utilizing the same

An EL element is provided in which a conjugate polymer that has a polythiophene derivative, a polyaniline derivative, a polypyrrole derivative or a polyfuran derivative as a fundamental skeleton and is soluble in an organic solvent is oxidized in its main chain with a dopant of an electron-accepting organic molecule that does not contain an acid component, and the doped conjugate polymer is used as a material to form a hole injecting layer. The polymer, being soluble in an organic solvent, can be formed in film even on a substrate high in the water repellency; that is, it can be easily formed in film on a TFT substrate and the like indispensable for an active matrix display device. Furthermore, since a dopant that does not contain an acid component is used, influence on an organic thin film and an electrode that are in contact with the hole injecting layer can be suppressed to the minimum level.

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Kanagawa, Japan

Atsushi Tokuda