Ricoh Company, Ltd.

Semiconductor Energy Laboratory Co., Ltd.

Tomohiro Kubota

Yoshiyuki Shimizu

Tomofumi Yoshida

Naoki Nakatake

Hirobumi Ooyoshi

Kenzo Tatsumi

Yoshihiro Kawakami

Shoh Tsuritani

Manabu Hamada

Masato Tsuji

Koji Kato

Masanari Fujita

Satoshi Seo

Takeyoshi Watabe

Nobuharu Ohsawa

Airi Ueda

Sho Tsuritani

Atsushi Takehara

Hideko Inoue

Emi Kita

Yasushi Kitano

Yuko Kubota

Shunpei Yamazaki

Tetsumaru Fujita

Kohta Sakaya

Yutaka Naitoh

Kyoko Abe

Takao Tosu

Osamu Saito

Yoshihiro Fujiwara

Yuji Nagatomo

Miki Kanamoto

Ryusuke Mase

Yuuki Tsuchiya

Yuta Kawano

Takahiro Sanada

Akinori Harada

Tsunenori Suzuki

Hiromi Seo

Kenji Nakamura

Tomoya Adachi

Yasuhiro Fujiwara

Hiroshi Fujiwara

Nobuo Takami

Naoaki Hashimoto

Kazuyoshi Kondo

Hiroki Suzuki

Kazuki Yogosawa

Shuntaroh Tamaki

Yusuke Takita

Kazuki Matsumoto

Nobuhiko Kita

Takeshi Yamashita

Takao Hamada

Minoru Toyoda

Takafumi Miyazaki

Shinichi Arasawa

Hiroaki Katoh

Haruo Hashimoto

Tatsuo Fukushima

Yasuhide Matsuno

Takeru Muramatsu

Naohiro Kawashima

Toshiaki Takane

Hotaru Hashikawa

Rumi Miyazaki

Hayato Yamawaki

A novel organic compound is provided. A novel organic compound having a carrier-transport property is provided. A novel organic compound having a hole-transport property is provided. An organic compound having a low refractive index is provided. An organic compound having a low refractive index and a carrier-transport property is provided. An organic compound having a low refractive index and a hole-transport property is provided. An organic compound represented by the following general formula (G1) is provided.

Organic compound, light-emitting device, light-emitting apparatus, electronic equipment, lighting device, and electronic device

A material for a hole-transport layer includes a monoamine compound. The first aromatic group, the second aromatic group, and the third aromatic group are bonded to the nitrogen atom of the monoamine compound. The first and second aromatic groups each independently include 1 to 3 benzene rings. One or both of the first and second aromatic groups have one or more hydrocarbon groups each having 1 to 12 carbon atoms each forming a bond only by the sphybrid orbitals. The total number of the carbon atoms in the hydrocarbon group in the first or second aromatic group is 6 or more. The total number of the carbon atoms in all of the hydrocarbon groups in the first and second aromatic groups is 8 or more. The third aromatic group is a substituted or unsubstituted monocyclic condensed ring or a substituted or unsubstituted bicyclic or tricyclic condensed ring.

Material for hole-transport layer, material for hole-injection layer, organic compound, light-emitting device, light-emitting apparatus, electronic device, and lighting device

An organic semiconductor device with low driving voltage is provided. The light-emitting device includes an anode, a cathode, and an EL layer between the anode and the cathode. The EL layer includes a hole-transport layer and alight-emitting layer. The hole-transport layer is positioned between the anode and the light-emitting layer. The hole-transport layer is not in contact with the anode. The hole-transport layer includes a transport layer material for a light-emitting device and the GSP_slope that is a potential gradient of a surface potential of an evaporated film of the material is higher than or equal to 20 (mV/nm).

Hole-transport layer material, electron-blocking layer material, electron-transport layer material, hole-blocking layer material, light-emitting device, light-emitting apparatus, electronic device, and lighting device

A light-emitting apparatus with low power consumption is provided. A light-emitting apparatus including a first light-emitting device and a first color conversion layer. The first light-emitting device includes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a layer including a material with a refractive index lower than or equal to 1.75 at 467 nm. The first color conversion layer includes a first substance capable of emission by absorbing light. Light emitted from the first light-emitting device enters the first color conversion layer.

Light-emitting device, electronic device, and lighting device

An object is to provide an organic compound with a low refractive index. Alternatively, a novel organic compound with a low refractive index and an electron-donating property is provided. Alternatively, an EL device with high emission efficiency is provided. An organic compound having an arylamine skeleton including a fluorine atom or an acridine skeleton including a fluorine atom and an EL device using the organic compound are provided. The EL device preferably includes a hole-injection layer containing the organic compound having an arylamine skeleton including a fluorine atom or an acridine skeleton including a fluorine atom and a substance showing an electron-accepting property with respect to the organic compound.

Organic compound, EL device, light-emitting apparatus, electronic appliance, lighting device, and electronic device

An organic compound having a hole-transport property and a low refractive index is provided. An organic compound represented by General Formula (G1) shown below is provided. In General Formula (G1), Arrepresents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms in a ring, n represents an integer of 0 or 1, and Arrepresents an aryl group having 6 to 10 carbon atoms in a ring and includes at least one branched-chain or cyclic alkyl group having 3 to 12 carbon atoms. The total number of carbon atoms of the branched-chain or cyclic alkyl group in Aris more than or equal to 6. Rto Reach independently represent an alkyl group having 1 to 6 carbon atoms. Rto Rand Rto Reach independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Any one of Rto Rand any one of Rto Reach represent a bond directly bonded to a nitrogen atom, and the others each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Organic compound, light-emitting device, light-emitting apparatus, electronic device, and lighting device

To provide a novel arylamine compound with a low refractive index. The provided arylamine compound includes at least one aromatic group. The aromatic group includes a first benzene ring, a second benzene ring, a third benzene ring, and at least three alkyl groups. The first benzene ring, the second benzene ring, and the third benzene ring are directly bonded in this order. The first benzene ring is bonded to nitrogen of amine. The first benzene ring may further include a substituted or unsubstituted phenyl group. The second benzene ring or the third benzene ring may further include an alkylated phenyl group. Each of first positions and third positions of two or more of the first to third benzene rings is independently bonded to another benzene ring, a benzene ring of the alkylated phenyl group, any of the at least three alkyl groups, or the nitrogen of the amine.

Arylamine compound, hole-transport layer material, hole-injection layer material, light-emitting device, light-emitting apparatus, electronic apparatus, and lighting device

A developer accommodating device includes a rotator including a rotation shaft, a collar that rotates together with the rotation shaft, and a bearing rotatably supporting the rotation shaft via the collar. The rotation shaft includes a resin material, and collar including a metal material. The collar includes a collar main portion to be in sliding contact with the bearing, and a flange portion closer to a center of the rotator in an axial direction of the rotator than the collar main portion. The collar main portion has a first outer diameter, and the flange portion has a second outer diameter greater than the first outer diameter of the collar main portion.

Developer accommodating device with screw including screw blade as rotator, developing device, process cartridge, and image forming apparatus

A toner cartridge include a convex portion and a conveyance drive gear. There is a protrusion which protrudes from the center of the conveyance drive gear. Further, there is a hole at a rear side of the convex portion. The protrusion is to be inserted into the hole which is at the rear side of the convex portion.

Toner cartridge including a protrusion protruding from a center of a conveyance drive gear

An image forming apparatus includes an image bearer, a rotation shaft, a developing device, and a supply portion. The developing device includes a developing device main portion that rotates around the rotation shaft between a developing position and a retracted position and includes a developer, a developer bearer to face or be away from the image bearer depending on whether the developing device main portion is at the developing position or the retracted position, a replenishment portion having a replenishment port with an opposite surface formed by an arc drawn around the rotation shaft to replenish the developer, and a non-rotating portion. The supply portion has a supply port with an opposite surface formed by an arc drawn around the rotation shaft and facing the opposite surface of the replenishment port. The supply port communicates the replenishment port and supplies the developer to the developing device through the replenishment port.

Image forming apparatus including a process cartridge that includes a developing device

A removable device detachably attachable to a receiving structure includes a convex to be inserted into a groove of the receiving structure, a rotator to rotate around a rotational shaft, a recess at a rear side of the convex, a gear attached to the rotational shaft, and a gear cover to cover at least a part of the gear. Further, an end of the rotational shaft is inserted into the recess, part of the gear is exposed from the gear cover, and a peripheral of the end of the rotational shaft is surrounded by the gear cover.

Developer container for image forming apparatus

Growing community of inventors

Osaka, Japan

Tomohiro Kubota