Semiconductor Energy Laboratory Co., Ltd.

Yuko Kubota

Satoshi Seo

Takeyoshi Watabe

Satomi Mitsumori

Nobuharu Ohsawa

Tomohiro Kubota

Airi Ueda

Shunpei Yamazaki

Harue Osaka

Tatsuyoshi Takahashi

Tomoya Hirose

A light-emitting element having low driving voltage and high emission efficiency is provided. In the light-emitting element, a combination of a guest material and a host material forms an exciplex. The guest material is capable of converting triplet excitation energy into light emission. Light emission from the light-emitting layer includes light emission from the guest material and light emission from the exciplex. The percentage of the light emission from the exciplex to the light emission from the light-emitting layer is greater than 0 percent and less than or equal to 60 percent. The energy after subtracting the energy of light emission from the exciplex from the energy of light emission from the guest material is greater than 0 eV and less than or equal to 0.23 eV.

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

A material for a hole-transport layer includes a monoamine compound. The first aromatic group, the second aromatic group, and the third aromatic group are bonded to the nitrogen atom of the monoamine compound. The first and second aromatic groups each independently include 1 to 3 benzene rings. One or both of the first and second aromatic groups have one or more hydrocarbon groups each having 1 to 12 carbon atoms each forming a bond only by the sphybrid orbitals. The total number of the carbon atoms in the hydrocarbon group in the first or second aromatic group is 6 or more. The total number of the carbon atoms in all of the hydrocarbon groups in the first and second aromatic groups is 8 or more. The third aromatic group is a substituted or unsubstituted monocyclic condensed ring or a substituted or unsubstituted bicyclic or tricyclic condensed ring.

Material for hole-transport layer, material for hole-injection layer, organic compound, light-emitting device, light-emitting apparatus, electronic device, and lighting device

A light-emitting apparatus with low power consumption is provided. A light-emitting apparatus including a first light-emitting device and a first color conversion layer. The first light-emitting device includes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a layer including a material with a refractive index lower than or equal to 1.75 at 467 nm. The first color conversion layer includes a first substance capable of emission by absorbing light. Light emitted from the first light-emitting device enters the first color conversion layer.

Light-emitting device, electronic device, and lighting device

A novel heterocyclic compound is provided. A highly efficient and reliable light-emitting element is provided. The heterocyclic compound is represented by a general formula (G1). In the general formula (G1), any one, two, or three of Yto Yin a ring A represent N atoms, and the rest of Yto Yrepresents CH. In the case where any two or three of the Yto Yare N atoms, the N atoms are not next to each other. Further, Arrepresents a substituted or unsubstituted biphenyldiyl group, Arrepresents a substituted or unsubstituted biphenyldiyl group, Czrepresents a substituted or unsubstituted heterocyclic group including a carbazole skeleton, Czrepresents a substituted or unsubstituted heterocyclic group including a carbazole skeleton, the carbazole skeleton included in the Czis directly bonded to the Ar, and the carbazole skeleton included in the Czis directly bonded to the Ar.

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

Provided is a novel substance that can be used in an element capable of emitting phosphorescence, a novel substance that contributes to high emission efficiency, or a novel substance that contributes to light emission with high color purity. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a substance including a carbazole skeleton. The substance is bonded to a substituted or unsubstituted first arylene group through a nitrogen atom included in the carbazole skeleton. The first arylene group is bonded to a substituted or unsubstituted benzofuropyridyl group or a substituted or unsubstituted benzothienopyridyl group. The first arylene group includes 1 to 5 substituted or unsubstituted second arylene groups which are bonded to one another. The EL layer may further include a layer including an emission center substance, specifically an iridium compound.

Growing community of inventors

Kanagawa, Japan

Yuko Kubota