Semiconductor Energy Laboratory Co., Ltd.

Takao Hamada

Satoshi Seo

Hideko Inoue

Hiromi Seo

Tatsuyoshi Takahashi

Kanta Abe

Hiroki Suzuki

Kyoko Takeda

Yasushi Kitano

Nobuharu Ohsawa

Sachiko Kawakami

Satoko Shitagaki

Yoshimi Ishiguro

Shunpei Yamazaki

Tomoya Aoyama

Takahiro Ishisone

Takuya Tsurume

Harue Osaka

Tomohiro Kubota

Hiroshi Kadoma

Masato Suzuki

Yuko Kawata

Satomi Mitsumori

Toshiki Hamada

A light-emitting element having a long lifetime is provided. A light-emitting element exhibiting high emission efficiency in a high luminance region is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains a first organic compound, a second organic compound, and a phosphorescent compound. The first organic compound is represented by a general formula (G0). The molecular weight of the first organic compound is greater than or equal to 500 and less than or equal to 2000. The second organic compound is a compound having an electron-transport property. In the general formula (G0), Arand Areach independently represent a fluorenyl group, a spirofluorenyl group, or a biphenyl group, and Arrepresents a substituent including a carbazole skeleton.

Light-emitting element, light-emitting device, electronic device, and lighting device

To provide a light-emitting element with an improved reliability, a light-emitting element with a high current efficiency (or a high quantum efficiency), and a novel dibenzo[f,h]quinoxaline derivative that is favorably used in a light-emitting element which is one embodiment of the present invention. A light-emitting element includes an EL layer between an anode and a cathode. The EL layer includes a light-emitting layer; the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance; the combination of the first organic compound and the second organic compound forms an exciplex; the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound; and a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.

Light-emitting element, light-emitting device, electronic device, lighting device, and organic compound

A light-emitting element having a long lifetime is provided. A light-emitting element exhibiting high emission efficiency in a high luminance region is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains a first organic compound, a second organic compound, and a phosphorescent compound. The first organic compound is represented by a general formula (GO). The molecular weight of the first organic compound is greater than or equal to 500 and less than or equal to 2000. The second organic compound is a compound having an electron-transport property. In the general formula (GO), Arand Areach independently represent a fluorenyl group, a spirofluorenyl group, or a biphenyl group, and Arrepresents a substituent including a carbazole skeleton.

A novel heterocyclic compound is provided. In particular, a novel heterocyclic compound which can improve the element characteristics of a light-emitting element is provided. A novel light-emitting element with high emission efficiency and high heat resistance is provided. A heterocyclic compound represented by General Formula (G). A represents any of a dibenzothiophenyl group, a dibenzofuranyl group, and a carbazolyl group. DBq represents a dibenzo[f,h]quinoxalinyl group. In addition, n is 0 or 1. Each of Arto Arindependently represents a substituted or unsubstituted arylene group having 6 to 10 carbon atoms. In Arto Ar, the adjacent arylene groups may be bonded to each other to form a ring. When the adjacent arylene groups in Arto Arform a fluorene skeleton, the fluorene skeleton may have a substituent. 

Heterocyclic compound, light-emitting element, light-emitting device, electronic device, and lighting device

Provided is a light-emitting element including a first organic compound, a second organic compound, and a guest material. The LUMO level of the first organic compound is lower than that of the second organic compound. The HOMO level of the first organic compound is lower than that of the second organic compound. The LUMO level of the guest material is higher than that of the first organic compound. The HOMO level of the guest material is higher than that of the second organic compound. An energy difference between the LUMO level and the HOMO level of the guest material is larger than an energy difference between the LUMO level of the first organic compound and the HOMO level of the second organic compound. The guest material can convert triplet excitation energy into light emission. The combination of first organic compound and the second organic compound can form an exciplex.

Light-emitting element, display device, electronic device, and lighting device

A novel heterocyclic compound is provided. In particular, a novel heterocyclic compound which can improve the element characteristics of the light-emitting element is provided. The heterocyclic compound is represented by a general formula (G1)DBqArAr-A&#x2003;&#x2003;(G1)in which a substituted or unsubstituted dibenzo[f,h]quinoxalinyl group and a substituted or unsubstituted benzobisbenzofuranyl group are bonded to each other via a substituted or unsubstituted arylene group. In the general formula (G1), DBq represents a substituted or unsubstituted dibenzo[f,h]quinoxalinyl group, Arrepresents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, n represents 0 or 1, Arrepresents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms, and A represents a substituted or unsubstituted benzobisbenzofuranyl group. When the arylene group represented by Arand Arhas substituents, the substituents may be bonded to each other to form a ring.

A novel organic compound having a high hole-transport property is provided. A long-lifetime light-emitting element is provided. An organic compound represented by General Formula (G0) is provided. In General Formula (G0), Arrepresents a substituted or unsubstituted naphthyl group, Arrepresents a substituted or unsubstituted carbazolyl group, Arrepresents a substituted or unsubstituted fluorenyl group or a substituted or unsubstituted spirofluorenyl group, and &#x3b1;and &#x3b1;each independently represent a substituted or unsubstituted phenylene group or a substituted or unsubstituted biphenyldiyl group.

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

A novel phosphorescent organometallic iridium complex is provided in which a coordination position of a ligand with respect to a metal can be controlled in synthesis. A novel phosphorescent organometallic iridium complex is provided which can keep high quantum efficiency and can emit phosphorescence in the blue to green wavelength region. A phosphorescent organometallic iridium complex which includes a structure represented by General Formula (G1) and whose ligand is a 4H-1,2,4-triazole compound which has an unsubstituted phenyl group at the 3-position, a substituted or unsubstituted phenyl group at the 4-position, and a phenyl group at the 5-position. In the phenyl group at the 5-position, an alkyl group is bonded to at least one of the ortho-positions, and the other of the ortho-positions, the meta-positions, and the para-position are substituted or unsubstituted. 

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Kanagawa, Japan

Takao Hamada