Nippon Steel Chemical & Material Co., Ltd.

Mitsubishi Electric Corporation

Yuta Sagara

Hiroshi Sasaki

Shinya Watanabe

Masashi Tada

Junya Ogawa

Kazuaki Yoshimura

Katsuhide Noguchi

Atsushi Kawada

Kohei Matsumura

Munetomo Inoue

Yasuhiro Kamino

Nobuo Miyoshi

Shota Yamane

Kentaro Kokura

Yuta Kohi

Provided is a thermally activated delayed fluorescent emission-type organic electroluminescent device (organic EL device) having a low driving voltage, high luminous efficiency, and a long lifetime. The organic EL device is a delayed fluorescent emission-type organic EL device including one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains a para-biphenylcarbazole compound-type host material represented by the general formula (1), and an indolocarbazole compound-type thermally activated delayed fluorescent light-emitting material including an indolocarbazole ring in a molecule thereof.

Organic electroluminescent element

Provided are an organic EL device having high luminous efficiency and a prolonged lifespan with a low driving voltage, and a melt mixture for an organic electroluminescent device used in the organic EL device. The melt mixture for an organic electroluminescent device is a melt mixture of at least two types of organic compounds including a first organic compound and a second organic compound, and a difference in vapor deposition temperature between the first organic compound and the second organic compound is 20° C. or less, and a difference between a PL maximum emission wavelength of the melt mixture and a PL maximum emission wavelength of any of the first organic compound and the second organic compound is within ±10 nm. The melt mixture is suitable as a host material of a light-emitting layer.

Melt mixture for organic electroluminescent element, and organic electroluminescent element

Provided is a thermally activated delayed fluorescent blue light-emitting organic EL device having high luminous efficiency and a long lifetime. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains an indolocarbazole compound represented by the following general formula (1), which serves as a thermally activated delayed fluorescent light-emitting material, and a carbazole compound serving as a host material, and a substituent Arwith which a N atom in the indolocarbazole ring compound is substituted has at least one fluorine atom.

Provided is a thermally activated delayed fluorescent organic electroluminescent device having a low driving voltage, high luminous efficiency, and a long lifetime. The organic electroluminescent device includes light-emitting layers between an anode and a cathode opposite to each other, and at least one of the light-emitting layers contains a thermally activated delayed fluorescent material, or the thermally activated delayed fluorescent material and a host material. The thermally activated delayed fluorescent material is represented by the following general formula (1) where A represents an electron-withdrawing group, such as a CN group, and Dand Deach represent an electron-donating group having an indole ring structure.

Organic electroluminescence element

Provided is a thermally activated delayed fluorescence-emitting organic EL element having a low driving voltage, high luminous efficiency, and a prolonged lifespan. The organic EL element contains one or more light-emitting layers between an anode and a cathode that face each other, and at least one light-emitting layer contains a host material composed of a carbazole compound represented by formula (1) and a thermally activated delayed fluorescence material composed of an indolocarbazole compound containing an indolocarbazole ring in its molecule. Here, Lrepresents an aromatic group, and at least one Rrepresents a carbazolyl group, and n is 1 or 2. 

An overcurrent tripping device includes a tripping conductor connected to the main circuit; a fixed core inside which the tripping conductor penetrates and which is excited by current flowing through the tripping conductor; a movable core which is arranged to be opposed to the fixed core with a magnetic gap therebetween, and which forms a magnetic circuit in cooperation with the fixed core, and moves by being attracted by the fixed core when overcurrent flows through the tripping conductor; and a shaft fixed to the movable core to guide the movement of the movable core, and linked to the tripping mechanism of the circuit breaker, wherein the fixed core has a narrow gap formed in such a direction as to cross the magnetic circuit, so that magnetic saturation is suppressed by the narrow gap.

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Tokyo, Japan

Yuta Sagara