Toray Industries, Inc.

Atsushi Ikeda

Kazuki Shigeta

Daisaku Tanaka

Takeshi Ikeda

Tsuyoshi Tominaga

Takejiro Inoue

Kazuki Goto

Takeshi Arai

Yasunori Ichihashi

Shinichi Matsuki

The purpose of the present invention is to provide an organic thin-film luminescent element which exhibits improved luminous efficiency, drive voltage and durability life. This fluoranthene derivative is characterized by having a specific structure that contains a fluoranthene skeleton.

Fluoranthene derivative, light-emitting device material containing same, and light-emitting device

The present invention provides an organic thin film light emitting device having high luminous efficiency and durable life realized by using a benzindolocarbazole derivative as represented by either general formula (1-1) or (1-2) given below: [Chemical compound 1] wherein Rto Rmay be identical to or different from each other and are selected from the group consisting of a hydrogen atom, alkyl group, cycloalkyl group, heterocyclic group, amino group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen atom, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, silyl group, and &#x2014;P(&#x2550;O)RR; Rand Rrepresent either an aryl group or a heteroaryl group; Rand Rmay be condensed to form a ring; Lto Lindependently represent a single bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group; and Ato Aindependently represent an amino group, aryl group, heterocyclic group, or heteroaryl group.

Benzindolocarbazole derivative, light-emitting element material produced using same, and light-emitting element

The present invention provides a producing method of powder particles having an average particle diameter on the order of submicrons. Specifically, the producing method is a producing method of powder particles obtained by grinding a product to be ground by using plural grinding media, wherein the grinding media including at least one kind (grinding medium A) having an average particle diameter of 0.01 to 5 times and at least one kind (grinding medium B) having an average particle diameter of 10 to 450 times, with respect to the average particle diameter of the product to be ground before being ground, are used.

Producing method of powder particles by using grinding medium

An object of the present invention is to provide a paste for an electron emission source, which can retain good electric contact between CNT and a cathode electrode, by containing an electrically conductive particle having a particle diameter within the optimal range. A paste for an electron emission source containing a carbon nanotube having a diameter of 1 nm or more and less than 10 nm, and an electrically conductive part having an average particle diameter of 0.1 to 1 &#x3bc;m.

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Otsu, Japan

Atsushi Ikeda