Idemitsu Kosan Company, Limited

Idemtisu Kosan Co., Ltd.

Kumiko Hibino

Kazuki Nishimura

Tetsuya Inoue

Mitsunori Ito

Toshinari Ogiwara

Kei Yoshida

Kiyoshi Ikeda

Yumiko Mizuki

Nobuhiro Yabunouchi

Toshihiro Iwakuma

Tomoki Kato

Takayasu Sado

The organic electroluminescence device includes an anode, a cathode, and at least an emitting layer between the anode and the cathode. The emitting layer includes a first host material, a second host material, and a phosphorescent dopant material. The first host material is a compound represented by a formula (1) below and the second host material is a compound represented by a formula (2) below. 

Organic electroluminescence element, and material for organic electroluminescence element

A biscarbazole derivative of the invention is represented by a formula (1) below.  In the formula (1): Arepresents a substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; Arepresents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; Xand Xeach are a linking group; Yto Yeach represent a substituent; p and q represent an integer of 1 to 4; and r and s represent an integer of 1 to 3.

Biscarbazole derivative, material for organic electroluminescence device and organic electroluminescence device using the same

A biscarbazole derivative having a specific group, which is represented by formula (1): and an organic electroluminescence device in which a plurality of organic thin-film layers including a light emitting layer are disposed between a cathode and an anode, and at least one of the organic thin-film layers include the biscarbazole derivative. The organic electroluminescence device exhibits high emission efficiency and has a long lifetime. In formula (1), each of Aand Aindependently represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms; each of Yto Yindependently represents C(R) or a nitrogen atom; each of R groups independently represents a hydrogen atom, etc.; and each of Land Lindependently represents a single bond, etc.; provided that at least one of A, Aand R represents a substituted or unsubstituted fluoranthenyl group, etc.

Biscarbazole derivative and organic electroluminescent element using same

An organic electroluminescence device includes: a cathode; an anode; and an organic thin-film layer having one or more layers and provided between the anode and the cathode, in which the organic layer includes an emitting layer. The emitting layer includes a first host material, a second host material and a phosphorescent dopant material. The first host material is a compound represented by a formula (1A). The second host material is a compound represented by a formula (2A). 

Organic electroluminescent element and material for organic electroluminescent elements

An organic electroluminescence device employing a specific biscarbazole derivative having a cyano group as a first host and a compound having both a carbazole structure and a nitrogen-containing aromatic heteroring as a second host. The organic electroluminescence device has a prolonged lifetime.

Material for organic electroluminescence device and organic electroluminescence device

A material for an organic electroluminescence device represented by the following formula (I): 

Material for organic electroluminescence device, and organic electroluminescence device using the same

A material for organic electroluminescence device having a specific central skeleton to which a cyano-substituted aromatic hydrocarbon group or a cyano-substituted heterocyclic group is bonded at its specific position is described. Further described is an organic electroluminescence device including an organic thin film layer between an anode and a cathode. The organic thin film layer include an light emitting layer and at least one layer of the organic thin film layer contains the material for organic electroluminescence device. The material for organic electroluminescence device realizes an organic electroluminescence device with good emission efficiency.

A compound of the invention is represented by a formula (1) below. In the formula (1), at least one of Aand Arepresents a substituted or unsubstituted nitrogen-containing aromatic heterocyclic group. A material for an organic electroluminescence device contains the compound represented by the formula (1). The material for an organic electroluminescence device includes an organic thin-film layer between an anode and a cathode, in which the organic thin-film layer contains the compound represented by the formula (1). 

Carbazole compound, material for organic electroluminescence device and organic electroluminescence device

A material for organic EL device which includes a compound having a specific structure: an azine ring having a cyano-substituted aromatic hydrocarbon group, an azine ring having a cyano-substituted heterocyclic group, or an azine ring having a cyano group directly bonded to the azine ring. An organic electroluminescence device including an organic thin film layer between a cathode and an anode, wherein the organic thin film layer includes a light emitting layer and at least one layer containing the material for organic electroluminescence device, has a long lifetime.

A biscarbazole derivative of the invention is represented by a formula (1A) or (1B) below.  In the formula (1A) or (1B): Arepresents a substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; Arepresents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; Xand Xeach are a linking group; Yto Yeach represent a substituent; p and q represent an integer of 1 to 4; and r and s represent an integer of 1 to 3.

Provided are an organic electroluminescence device having high current efficiency and a long lifetime, and a biscarbazole derivative for realizing the device. The biscarbazole derivative has a specific substituent. The organic EL device has a plurality of organic thin-film layers including a light emitting layer between a cathode and an anode, and at least one layer of the organic thin-film layers contains the biscarbazole derivative.

Biscarbazole derivatives and organic electroluminescence

An organic EL device material includes at least a unit including 3,5-biscarbazolylphenyl group, a unit including 4-carbazolylphenyl group, and a compound including a unit including a nitrogen-containing aromatic heterocyclic ring bonding the unit including 3,5-biscarbazolylphenyl group and the unit including 4-carbazolylphenyl group.

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Sodegaura, Japan

Kumiko Hibino