Semiconductor Energy Laboratory Co., Ltd.

Hiroko Yamazaki

Satoshi Seo

Tetsuo Tsutsui

Atsushi Tokuda

Toshimitsu Konuma

Shunpei Yamazaki

Satoko Shitagaki

Harue Nakashima

Takako Takasu

Hideko Inoue

Ryoji Nomura

By introducing new concepts into a structure of a conventional organic semiconductor element and without using a conventional ultra thin film, an organic semiconductor element is provided which is more reliable and has higher yield. Further, efficiency is improved particularly in a photoelectronic device using an organic semiconductor. Between an anode and a cathode, there is provided an organic structure including alternately laminated organic thin film layer (functional organic thin film layer) realizing various functions by making an SCLC flow, and a conductive thin film layer (ohmic conductive thin film layer) imbued with a dark conductivity by doping it with an acceptor and a donor, or by the like method.

Organic semiconductor element

A high efficient white emission light emitting element having peak intensity in each wavelength region of red, green, and blue is provided. Specifically, a white emission light emitting element having an emission spectrum that is independent of current density is provided. A first light emitting layerexhibiting blue emission and a second light emitting layercontaining a phosphorescent material that generates simultaneously phosphorescent emission and excimer emission are combined. In order to derive excimer emission from the phosphorescent material, it is effective to disperse a phosphorescent materialhaving a high planarity structure such as platinum complex at a high concentration of at least 10 wt % to a host material. Further, the first light emitting layeris provided to be in contact with the second light emitting layerat the side of an anode. Ionization potential of the second light emitting layeris preferably larger by 0.4 eV than that of the first light emitting layer

Light emitting element and light emitting device

The present invention provides a white organic light-emitting element high in the emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in the emission efficiency. It is preferable to use an electron transport material between a first emission region and a second emission region and more preferable to use a hole block material.

Organic light-emitting element and light-emitting device with the organic light-emitting element

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

The present invention provides a white organic light-emitting element high in emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in emission efficiency.

Light emitting device

The present invention provides a white organic light-emitting element high in the emission efficiency. In particular, the invention provides a white organic light-emitting element that has an emission spectrum having peaks in the respective wavelength regions of red color, green color and blue color and is high in the emission efficiency. Since a spectrum region lowest in the emission efficiency is a red region, by introducing a reddish phosphorescent material, a highly efficient white organic light-emitting element is obtained. At this time, in order to inhibit the reddish phosphorescent material from singularly emitting, as shown in FIG., a distance between a second emission regionwhere a reddish phosphorescent materialis a luminescent material and a first emission regionthat exhibits emission in a shorter wavelength side than the second emission region is separated. In a configuration shown in FIG., it is preferable to use an electron transport material in a layerbetween the first emission region and the second emission region and more preferable to use a hole block material.

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Kanagawa, Japan

Hiroko Yamazaki