Semiconductor Energy Laboratory Co., Ltd.

Nobuharu Ohsawa

Satoshi Seo

Sachiko Kawakami

Hideko Inoue

Satoko Shitagaki

Harue Osaka

Toshiki Sasaki

Shunpei Yamazaki

Ryoji Nomura

Hiroshi Kadoma

Takahiro Ushikubo

Takahiro Ishisone

Tsunenori Suzuki

Hiromi Nowatari

Masakazu Egawa

Kunihiko Suzuki

Hiroko Nomura

Yusuke Nonaka

Harue Nakashima

Takeyoshi Watabe

Tetsuo Tsutsui

Hiroki Suzuki

Kumi Kojima

Airi Ueda

Kyoko Takeda

Yuko Kawata

Hisao Ikeda

Mikio Yukawa

Takuya Kawata

Takako Takasu

Akihiro Kaita

Masahiro Takahashi

Hiromi Seo

Yoshinobu Asami

Tomoka Nakagawa

Daiki Nakamura

Tomohiro Kubota

Masato Suzuki

Shogo Uesaka

Yasushi Kitano

Yui Yamada

Shunsuke Hosoumi

Hiroko Murata

Yasuhiko Takemura

Yoshiharu Hirakata

Tamae Takano

Hiroko Abe

Kaori Ogita

Yuta Kawano

Junichiro Sakata

Masami Jintyou

Yoshiaki Oikawa

Yasutaka Nakazawa

Takuya Haruyama

Kiyoshi Kato

Takao Hamada

Satomi Mitsumori

Kazuhiko Fujita

Yuko Kubota

Moe Nishimaki

Naoto Kusumoto

Daisuke Kubota

Naoaki Hashimoto

Yoshitaka Dozen

Hiromitsu Kido

Taisuke Kamada

Yusuke Takita

Miki Kanamoto

Takehisa Sato

Takumu Okuyama

Anna Tada

Sachiko Yamagata

Takao Tosu

Yuji Iwaki

Ikuko Kawamata

Nozomu Sugisawa

Ryohei Yamaoka

Shinobu Furukawa

Masatoshi Kataniwa

Tomoka Hara

Toshiki Hamada

Shiho Nomura

Keito Tosu

Ryo Narukawa

Tsuneori Suzuki

Emission efficiency of a light-emitting element is improved. The light-emitting element has a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer includes a fluorescent material and a host material. The second light-emitting layer includes a phosphorescent material, a first organic compound, and a second organic compound. An emission spectrum of the second light-emitting layer has a peak in a yellow wavelength region. The first organic compound and the second organic compound form an exciplex.

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

A light-emitting device with high emission efficiency is provided. The light-emitting device includes a first electrode, a second electrode, and an EL layer positioned between the first electrode and the second electrode. The EL layer includes at least a light-emitting layer, a first layer, a second layer, and a third layer. The first layer is positioned between the first electrode and the light-emitting layer. The third layer is positioned between the first layer and the light-emitting layer. The second layer is positioned between the first layer and the third layer. The first layer includes a first organic compound. The second layer includes a second organic compound. The third layer includes a third organic compound. The ordinary refractive index of the second organic compound is higher than the ordinary refractive indices of the first organic compound and the third organic compound.

Light-emitting device, display device, light-emitting apparatus, electronic device, and lighting device

A light-emitting element having high emission efficiency which includes a fluorescent material as a light-emitting substance is provided. A light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a light-emitting layer. The light-emitting layer includes a host material and a guest material. The host material has a difference of more than 0 eV and less than or equal to 0.2 eV between a singlet excitation energy level and a triplet excitation energy level. The guest material is capable of emitting fluorescence. The triplet excitation energy level of the host material is higher than a triplet excitation energy level of the guest material.

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

A near-infrared organic EL device with favorable efficiency is provided. A light-emitting device including a first electrode, a second electrode, and an EL layer is provided; in which the EL layer is positioned between the first electrode and the second electrode; in which the EL layer emits light having a peak of an emission spectrum in a wavelength range of greater than or equal to 750 nm and less than or equal to 1000 nm; in which one of the first electrode and the second electrode is an electrode having a transmitting property with respect to light with a peak wavelength of the emission spectrum of the EL layer; in which a first layer is provided in contact with a surface of the electrode having a transmitting property, which is opposite to a surface facing the EL layer; in which the first layer contains an organic compound; and in which the first layer has the local maximum value of an extinction coefficient k in the visible light region.

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 light-emitting device with high emission efficiency is provided. The light-emitting device includes an EL layer and a light-transmitting electrode. The EL layer includes a light-emitting layer and a low refractive index layer. The low refractive index layer is positioned between the light-emitting layer and the light-transmitting electrode. A cap layer is in contact with a surface of the light-transmitting electrode on the side opposite to the EL layer. The cap layer includes a high refractive index material having an ordinary refractive index of higher than or equal to 1.90 and lower than or equal to 2.40 and an ordinary extinction coefficient of higher than or equal to 0 and lower than or equal to 0.01. The low refractive index layer includes a low refractive index material having an ordinary refractive index of higher than or equal to 1.60 and lower than or equal to 1.70.

A light-emitting device with high emission efficiency and reliability is provided. The light-emitting device includes a fluorescent light-emitting layer and a phosphorescent light-emitting layer. A host material used in the fluorescent light-emitting layer has a function of converting triplet excitation energy into light emission and a guest material used in the fluorescent light-emitting layer emits fluorescence. The guest material has a molecular structure including a luminophore and a protecting group, and one molecule of the guest material includes five or more protecting groups. The introduction of the protecting groups into the molecule inhibits transfer of triplet excitation energy from the host material to the guest material by the Dexter mechanism. An alkyl group or a branched-chain alkyl group is used as the protecting group. The longest wavelength absorption band in the absorption spectrum of the guest material in the phosphorescent light-emitting layer has an overlap with the emission spectrum of the host material in the phosphorescent light-emitting layer.

Light-emitting device, light-emitting appliance, display device, electronic appliance, and lighting device

A light-emitting element having high emission efficiency is provided. The light-emitting element includes a first organic compound, a second organic compound, and a third organic compound. The first organic compound has a function of converting triplet excitation energy into light emission. The second organic compound is preferably a TADF material. The third organic compound is a fluorescent compound. Light emitted from the light-emitting element is obtained from the third organic compound. Triplet excitation energy in a light-emitting layer is transferred to the third organic compound by reverse intersystem crossing caused by the second organic compound or through the first organic compound.

Light-emitting element, display device, electronic device, and lighting device each having thermally-activated delayed fluorescent organic compound

A light-emitting device with high emission efficiency is provided. The light-emitting device includes a fluorescent substance and a phosphorescent substance or a thermally activated delayed fluorescent material; the fluorescent substance includes a luminophore and five or more protecting groups; the luminophore is a condensed aromatic ring or a condensed heteroaromatic ring; the five or more protecting groups each have any one of an alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, and a trialkylsilyl group having 3 to 12 carbon atoms; the lowest singlet excitation energy level of the fluorescent substance is higher than the lowest triplet excitation energy level of the phosphorescent substance or the thermally activated delayed fluorescent material; and light emission can be obtained from both the phosphorescent substance and the phosphorescent substance or the thermally activated delayed fluorescent material.

A light-emitting device is provided. The light-emitting device includes an intermediate layer, a first light-emitting unit, and a second light-emitting unit. The intermediate layer includes a region interposed between the first light-emitting unit and the second light-emitting unit. The intermediate layer has a function of supplying an electron to one of the first light-emitting unit and the second light-emitting unit and supplying a hole to the other. The first light-emitting unit includes a first light-emitting layer, the first light-emitting layer includes a first light-emitting material, the second light-emitting unit includes a second light-emitting layer, the second light-emitting layer includes a second light-emitting material, the second light-emitting layer has a first distance from the first light-emitting layer, and the first distance is longer than or equal to 5 nm and shorter than or equal to 65 nm.

Light-emitting device comprising charge-generation layer between light-emitting units

A light-emitting device with high emission efficiency and reliability is provided. The light-emitting device includes first and second fluorescent light-emitting layers. A host material used in the first fluorescent light-emitting layer has a function of converting triplet excitation energy into light emission, a guest material used in the first light-emitting layer has a molecular structure including a luminophore and a protecting group, and one molecule of the guest material includes five or more protecting groups. The introduction of the protecting groups into the molecule inhibits transfer of triplet excitation energy by the Dexter mechanism from the host material to the guest material. An alkyl group or a branched-chain alkyl group is used as the protecting groups. The materials are selected such that the triplet excitation energy level of the host material in the second light-emitting layer is lower than the triplet excitation energy level of the guest material in the second light-emitting layer.

An organic semiconductor device with low driving voltage is provided. The organic semiconductor device includes a layer containing an organic compound between a pair of electrodes. The layer containing an organic compound includes a hole-transport region. The hole-transport region includes a first layer and a second layer. The first layer is positioned between the anode and the second layer. When a potential gradient of a surface potential of an evaporated film is set as GSP (mV/nm), a value obtained by subtracting GSP of an organic compound in the second layer from GSP of an organic compound in the first layer is less than or equal to 20 (mV/nm).

Organic semiconductor device, organic el device, photodiode sensor, display device, light-emitting apparatus, electronic device, and lighting device

An organic compound having a hole-transport property and a low refractive index is provided. An organic compound represented by General Formula (G1) shown below is provided. In General Formula (G1), Arrepresents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms in a ring, n represents an integer of 0 or 1, and Arrepresents an aryl group having 6 to 10 carbon atoms in a ring and includes at least one branched-chain or cyclic alkyl group having 3 to 12 carbon atoms. The total number of carbon atoms of the branched-chain or cyclic alkyl group in Aris more than or equal to 6. Rto Reach independently represent an alkyl group having 1 to 6 carbon atoms. Rto Rand Rto Reach independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Any one of Rto Rand any one of Rto Reach represent a bond directly bonded to a nitrogen atom, and the others each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

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

A long-lifetime light-emitting device is provided. The light-emitting apparatus includes a first light-emitting device and a first color conversion layer. The first color conversion layer contains a first substance. An EL layer of the first light-emitting device includes a first layer, a second layer, a third layer, a light-emitting layer, and a fourth layer in this order from the anode side. The first layer contains a first organic compound and a second organic compound. The second layer contains a third organic compound. The third layer contains a fourth organic compound. The light-emitting layer contains a fifth organic compound and a sixth organic compound. The fourth layer contains a seventh organic compound. The first organic compound is an organic compound having an electron accepting property to the second organic compound. The fifth organic compound is an emission center substance. The HOMO level of the second organic compound is higher than or equal to −5.7 eV and lower than or equal to −5.4 eV.

Light-emitting device, light-emitting apparatus, electronic device, display device, and lighting device

A light-emitting device with high emission efficiency and high reliability is provided. The light-emitting device includes a host material and a guest material in a light-emitting layer. The host material has a function of converting triplet excitation energy into light emission and the guest material emits fluorescence. The guest material has a molecular structure including a luminophore and protecting groups, and five or more protecting groups are included in one molecule of the guest materials. When the protecting groups are introduced into the molecule, triplet excitation energy transfer from the host material to the guest material by the Dexter mechanism is inhibited. As the protecting group, an alkyl group or a branched-chain alkyl group is used. A light-emitting device with improved emission efficiency can be obtained with the use of a material having a five-membered ring skeleton in the host material.

Light-emitting device

Growing community of inventors

Kanagawa, Japan

Nobuharu Ohsawa