Nippon Steel Chemical & Material Co., Ltd.

Nippon Steel & Sumikin Chemical Co., Ltd.

Pioneer Corporation

Tohoku Pioneer Corporation

Mitsuru Sakai

Kazuto Shiraishi

Takahiro Kai

Masashi Tada

Kazuaki Yoshimura

Katsuhide Noguchi

Tohru Asari

Masashi Niina

Yasuhiro Takahashi

Toshinao Yuki

Junya Ogawa

Taishi Tsuji

Hiroyuki Hayashida

Tokiko Ueda

Masanori Hotta

Yusuke Nakajima

Hiroshige Tanaka

Yuhki Terao

Takayuki Fukumatsu

Takaya Ishiyama

Yuji Ikenaga

Provided is an organic EL device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other. At least one of the light-emitting layers contains a host material and a light-emitting dopant, and (i) a first host formed of an indolocarbazole compound having one or two indolocarbazole rings, and (ii) a second host formed of a carbazole compound having a plurality of carbazole rings and having a bond structure represented by the following general formula (3) are used as the host material.

Organic electroluminescent element

Provided is a practically useful organic electroluminescent device (organic EL device) having high efficiency and high driving stability while being capable of being driven at a low voltage. The organic electroluminescent device includes a light-emitting layer between an anode and a cathode opposite to each other. The light-emitting layer contains two host materials and at least one light-emitting dopant. One of the two host materials is a host material selected from an indolocarbazole compound having one indolocarbazole ring and an indolocarbazole compound having two indolocarbazole rings, and the other thereof is a host material selected from carbazole compounds.

Provided are a polymer for an organic electroluminescent element, which has improved luminous efficiency and is applicable to a wet process, and an organic electroluminescent element obtained therefrom. The polymer for an organic electroluminescent element has a repeating unit represented by [&#x2014;(Z)-(A)-]in repeating units constituting a main chain. In addition, the organic electroluminescent element includes, between an anode and a cathode laminated on a substrate, organic layers including a hole-transporting layer and a light-emitting layer, in which at least one of the organic layers contains the polymer for an organic electroluminescent element. In the repeating unit, Z represents an N-indolocarbazolyl group, A represents a repeating unit different from Z, l and m each represent an abundance molar ratio, and l is 5 to 100 mol % and m is 0 to 95 mol %, and n is 2 to 10,000.

Polymer for use in organic electroluminescent element and organic electroluminescent element employing same

Provided are a nitrogen-containing aromatic compound useful for an organic electroluminescent device, and an organic electroluminescent device (organic EL device) that improves luminous efficiency of the device and sufficiently ensures driving stability of the device. The nitrogen-containing aromatic heterocyclic compound is represented by the following formula (1). The organic EL device includes an organic layer that contains the nitrogen-containing aromatic heterocyclic compound between an anode and a cathode laminated on a substrate. In the formula (1), a ring A represents an aromatic ring represented by the formula (1a) and fused with two adjacent rings, a ring B represents a heterocycle represented by the formula (1b) and fused with two adjacent rings, Y's each represent C&#x2014;R or N, X's each represent N&#x2014;Z, O, S, or Se, R represents hydrogen, an alkyl group, an aromatic group, or the like, and Z represents an alkyl group, an aromatic group, or the like. 

Nitrogen-containing aromatic compounds and organic electroluminescent device

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Kitakyushu, Japan

Mitsuru Sakai