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SEO SATOSHI, USHIKUBO TAKAHIRO: Light-Emitting Element and Lighting Device, Lichtemittierendes Element und Beleuchtungsvorrichtung, Élément électroluminescent et dispositif déclairage. SEMICONDUCTOR ENERGY LAB, September 21, 2011: EP2366753-A1 (34 worldwide citation)

To provide a light-emitting element whose power efficiency is improved and which emits light of natural color like light bulb color. In the light-emitting element, at least three light-emitting units are stacked. The emission spectrum of the light-emitting element has two peaks. One of the two peaks ...


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Nomura Hiroko, Osaka Harue, Ushikubo Takahiro, Kawakami Sachiko, Seo Satoshi, Shitagaki Satoko: Carbazole derivative, and light-emitting element, light-emitting device, and electronic device using carbazole derivative. Semiconductor Energy Laboratory, Nomura Hiroko, Osaka Harue, Ushikubo Takahiro, Kawakami Sachiko, Seo Satoshi, Shitagaki Satoko, June 11, 2009: WO/2009/072587 (12 worldwide citation)

To provide a light-emitting element having high luminous efficiency and to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage, a carbazole derivative represented by the general formula (1) is provided. In the formula, α1, α2, α3, and α4 eac ...


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Ushikubo Takahiro, Seo Tetsushi: Light-emitting element, light-emitting device, and electronic equipment. Semiconductor Energy Lab, April 9, 2009: JP2009-076450 (8 worldwide citation)

PROBLEM TO BE SOLVED: To provide a light-emitting element with high light-emitting efficiency in a white light-emitting element, a light-emitting device and an electronic equipment capable of showing a low power rate by using the same light-emitting element.SOLUTION: The highly efficient light-emitt ...


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NOWATARI HIROMI, SEO SATOSHI, OHSAWA NOBUHARU, USHIKUBO TAKAHIRO, TSUTSUI TETSUO: [fr] Élément électroluminescent, dispositif électroluminescent, dispositif déclairage et dispositif électronique, [de] Lichtemittierendes Element, lichtemittierende Vorrichtung, Beleuchtungsvorrichtung und elektronische Vorrichtung, [en] Light-emitting element, light-emitting device, lighting device, and electronic device. SEMICONDUCTOR ENERGY LAB, June 2, 2010: EP2192633-A2 (6 worldwide citation)

[en] An object is to provide a light-emitting element which exhibits light emission with high luminance and can be driven at low voltage. Another object is to provide a light-emitting device or an electronic device with reduced power consumption. Between an anode and a cathode, n ( n is a natural nu ...


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Ushikubo Takahiro: Light-emitting device, lighting apparatus, light-emitting apparatus and electronic device. Semiconductor Energy Lab, May 7, 2009: JP2009-099966 (6 worldwide citation)

PROBLEM TO BE SOLVED: To provide a light-emitting device improving the degree of a deterioration to a driving time and facilitating the adjustment of a luminescent color.SOLUTION: The light-emitting device has a first electrode, a second electrode and a layer containing organic compounds positioned ...


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Ushikubo Takahiro, Seo Tetsushi, Sugisawa Mare, Aoyama Tomoya: Light-emitting element and light-emitting device employing the same. Semiconductor Energy Lab, July 10, 2008: JP2008-159577 (4 worldwide citation)

PROBLEM TO BE SOLVED: To provide a white light-emitting element which emits white light close to natural light and having a broad spectrum waveform over a wide waveform region, and to provide white light-emitting element which emits white light that is close to the standard white color of NTSC, amon ...


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SEO Hiromi, SHITAGAKI Satoko, SEO Satoshi, USHIKUBO Takahiro, SASAKI Toshiki, UESAKA Shogo: [fr] ÉLÉMENT ÉLECTROLUMINESCENT, DISPOSITIF ÉLECTROLUMINESCENT, DISPOSITIF ÉLECTRONIQUE ET DISPOSITIF DÉCLAIRAGE, [en] LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE. Semiconductor Energy Laboratory, September 19, 2013: WO/2013/137088 (3 worldwide citation)

[en] A light-emitting element having high external quantum efficiency is provided. A light-emitting element having a long lifetime is provided. A light-emitting element includes a light-emitting layer between a pair of electrodes. The light-emitting layer contains at least a phosphorescent compound, ...


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Ushikubo Takahiro, Seo Tetsushi: Light-emitting element, light-emitting device, and electronic equipment. Semiconductor Energy Lab, May 28, 2009: JP2009-117356 (3 worldwide citation)

PROBLEM TO BE SOLVED: To provide a long-lifetime white light-emitting element with high luminous efficiency.SOLUTION: In the light-emitting element having, between an anode and a cathode, a first light-emitting layer containing a first light-emitting substance and a second light-emitting layer conta ...