Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

Sony Corporation

Man Design Co., Ltd.

Nitto Kohki Co., Ltd.

Konica Corporation

Tokyo Shibaura Denki Kabushiki Kaisha

Kanebo, Limited

Nichias Corporation

Hajime Takeuchi

Yasuhiro Shirakawa

Yasumasa Ooya

Ryo Sakai

Tsutomu Ishii

Giichiro Shimizu

Yoshio Wakatsuki

Toshiharu Okuyama

Misao Shimizu

Katsutoshi Nakagawa

Yumi Ito

Minoru Hashimoto

Takeo Ito

Masaki Toyoshima

Yoshitaka Funayama

Koshin Tanaka

Masahiko Yamakawa

Tetsuo Inoue

Toshihiko Oguchi

Tatsumi Maeda

Toshio Shimaoogi

Toshio Fukaya

Yoshikazu Okuyama

Shouta Endou

Kazuki Amemiya

Koichi Kubo

Fumiyoshi Abe

Katsuichi Tachi

Seiichi Tobisawa

Tadashi Ido

Masumi Koishi

Yukihiro Takenami

Shozo Hideyama

Masashi Awa

Takeo Itoh

Yumi Kanno

Yoshio Wakatuski

Michio Nakamura

Masahide Takahashi

Yasuki Matsuo

Hiromitu Kimura

Takumi Itani

Yuji Koguchi

Minori Murano

Ken-ichi Furuhata

A white LED lamp including: a conductive portion; a light emitting diode chip mounted on the conductive portion, for emitting a primary light having a peak wavelength of 360 nm to 420 nm; a transparent resin layer including a first hardened transparent resin, for sealing the light emitting diode chip; and a phosphor layer covering the transparent resin layer, the phosphor layer being formed by dispersing a phosphor powder into a second hardened transparent resin, and the phosphor powder receiving the primary light and radiating a secondary light having a wavelength longer than that of the primary light. An energy of the primary light contained in the radiated secondary light is 0.4 mW/lm or less.

White LED lamp, backlight, light emitting device, display device and illumination device

An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (SrBaMgMnEu)SiOwherein x, y, z, and &#x3c9; are respectively coefficients satisfying 0.1&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;0.5, 0&#x3c;z&#x3c;0.1, y&#x3e;z, and 0.01&#x3c;&#x3c9;&#x3c;0.2 is provided. The phosphor is used in combination with ultraviolet and blue light emitting diodes having a luminescence peak wavelength of 360 to 470 nm to form an LED light emitting device.

Phosphor and LED light emitting device using the same

A white LED lamp including: a conductive portion; a light emitting diode chip mounted on the conductive portion, for emitting a primary light having a peak wavelength of 360 nm to 420 nm; a transparent resin layer including a first hardened transparent resin, for sealing the light emitting diode chip; and a phosphor layer covering the transparent resin layer, the phosphor layer being formed by dispersing a phosphor powder into a second hardened transparent resin, and the phosphor powder receiving the primary light and radiating a secondary light having a wavelength longer than that of the primary light. An energy of the primary light contained in the radiated secondary light is 0.4 mW/Im or less.

Disclosed are a white LED, which has color reproducibility comparable with that of a cold-cathode tube and improved brightness, and a backlight and a liquid crystal display device comprising the white LED. The white LED comprises at least one light emitting element selected from ultraviolet light emitting diodes, purple light emitting diodes, ultraviolet light emitting lasers, and purple light emitting lasers, and a phosphor layer. The phosphor layer comprises a green phosphor satisfying formula 1, a blue phosphor satisfying formula 2 or 3, and a red phosphor satisfying formula 4 or 5:

White LED, backlight using the same, and liquid crystal display device

An object is to provide a white light emitting lamp in which a BGR phosphor containing blue, green and red phosphor is combined with a semiconductor light emitting element such as an LED, a deep red phosphor having a main emission peak in a longer wavelength region than a main emission peak of the red phosphor is further added so as to enhance characteristics, whereby both high luminance and high color rendering properties can be obtained. This invention provides a white light emitting lampcomprising: a semiconductor light emitting elementthat is placed on a boardand emits ultraviolet light or blue light; and a light emitting portion that is formed so as to cover a light emitting surface of the semiconductor light emitting element, the light emitting portion containing a blue phosphor B, a green phosphor G, and a red phosphor R that are excited by the light emitted from the semiconductor light emitting elementto respectively emit blue light, green light, and red light, the white light emitting lampemitting white light by mixing light emission colors from the blue phosphor B, the green phosphor G, and the red phosphor R with one another, wherein the light emitting portion further contains a deep red phosphor DR having a main emission peak in a longer wavelength region than a main emission peak of the red phosphor.

White light emitting lamp and white LED lighting apparatus including the same

Certain embodiments provide a white LED for a backlight of a liquid crystal display device, which comprises an ultraviolet (or violet) light emitting element and a phosphor layer that contains a green phosphor selected from trivalent cerium- and terbium-activated rare earth borate phosphors, a blue phosphor selected from divalent europium-activated halophosphate phosphors and divalent europium-activated aluminate phosphors, and a red phosphor selected from europium-activated lanthanum oxysulfide phosphors and europium-activated yttrium oxysulfide phosphors as the contained amounts of the respective phosphors relative to the total amount of the phosphors as follows: 35-50% by weight of the green phosphor content; 50-70% by weight of the blue phosphor content; and 1-10% by weight of the red phosphor content.

In a embodiment, a white LED for a backlight of a liquid crystal display device conforming to the EBU standard includes an ultraviolet (purple) light-emitting element, and a phosphor layer which contains 1 to 10 wt % of a green phosphor including a divalent europium-activated silicate phosphor, 40 to 80 wt % of a blue phosphor including at least one selected from a divalent europium-activated halo-phosphate phosphor and a divalent europium-activated aluminate phosphor, and 10 to 50 wt % of a red phosphor including at least one selected from a europium-activated lanthanum oxysulfide phosphor and a europium-activated yttrium oxysulfide phosphor.

White LED, backlight using same, and liquid crystal display device conforming to EBU standard

A white light emitting device includes a blue light emitting diode chip that emits blue light in a specific wavelength band, a first resin layer that seals the blue light emitting diode chip and includes a cured product of silicone resin, and a second resin layer that covers the first resin layer and includes phosphor powder, which absorbs the blue light and emits light in a specific wavelength band, and a cured product of transparent resin. The phosphor powder has a composition represented by the following Formula (1):(SrBaEu)SiO&#x2003;&#x2003;(1)(in Formula (1), x and y satisfy a condition that 0.05&#x3c;x&#x3c;0.5 and 0.05&#x3c;y&#x3c;0.3.) The first resin layer has thickness within a range of 200 &#x3bc;m to 2000 &#x3bc;m. The white light emitting device has high luminance for a long period.

White light emitting device, backlight, liquid crystal display device, and illuminating device

The present invention provides a semiconductor light emitting device comprising a light intensity difference reducing layer provided between an ultraviolet semiconductor light emitting element and a wavelength converting material layer, and a backlight and a display device comprising the semiconductor light emitting device. The semiconductor light emitting device is an LED light emitting device which has improved uniformity of emitted light and reduced non-uniformity of brightness and chromaticity of emitted light. The light emitting device according to the present invention is particularly suitable for use in various display devices, preferably, for example, in display devices in equipment where a reduction in size, a reduction in weight, a reduction in thickness, electric power saving, high brightness, and excellent color rendering properties are particularly required, for example, cellular phones, personal digital assistants, electronic dictionaries, digital cameras, computers, liquid crystal televisions (TVs), and peripheral devices of these devices.

Semiconductor light emitting device, and backlight and display device comprising the semiconductor light emitting device

Phosphor and LED light-emitting device using the same

A white LED lamp including: a conductive portion; a light emitting diode chip mounted on the conductive portion, for emitting a primary light having a peak wavelength of 360 nm to 420 nm; a transparent resin layer including a first hardened transparent resin, for sealing the light emitting diode chip; and a phosphor layer covering the transparent resin layer, the phosphor layer being formed by dispersing a phosphor powder into a second hardened transparent resin, and the phosphor powder receiving the primary light and radiating a secondary light having a wavelength longer than that of the primary light. An energy of the primary light contained in the radiated secondary light is 0.4 mW/lm or less. In the white LED lamp, a backlight, and an illumination device using the white LED lamp an amount of UV light to be contained in the released light and an amount of heat to be generated from the lamp are decreased to be small.

A linear white light sourceincludes a base, a plurality of light emitting diode chips linearly disposed on the base and each generating ultraviolet light having a wavelength of not less than 330 nm nor more than 410 nm, and a phosphor layer continuously formed on the base to cover the plurality of light emitting diode chips and containing a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor.

Linear white light source, and backlight and liquid crystal display device using the same

A positive electrode active material for use in a non-aqueous electrolyte secondary cell comprises a powdery metal oxide (LiCoO, LiNiO, LiMnOor the like). When the positive electrode active material is classified with a classification precision index &#x3ba; of 0.7 or greater so as to obtain a coarse powder having a classification ratio in a range of 0.1% to 5%, a ratio (B/A) of the content (B) of an impurity metal element in the coarse powder obtained by the classification to the content (A) of the impurity metal element in the powder before the classification is 1.5 or less. The contents of the impurity metal elements are compared with respect to Ca, Mn, Fe, Cr, Cu, Zn and the like (exclusive of the metal element constituting the powdery metal oxide). The positive electrode active material for a secondary cell serves to improve cell performance capabilities and production yields.

Positive electrode active material for secondary cell and nonaqueous electrolyte secondary cell using the same, and method for analysis of positive electrode active material for secondary cell

A light emitting moduleincludes a substratehaving a metal patternand a plurality of white light emitting deviceslinearly arranged on the substrate. The metal patternis formed on a portion of 60% or more of an area of the substrate. The white light emitting deviceincludes a light emitting diode as a semiconductor light emitting element. Light emitted from the semiconductor light emitting elementis converted into white light by a light emitting section containing phosphors, and is taken out. The light emitting moduleemits white light.

Light emitting module, backlight using the same, and liquid crystal display device

Growing community of inventors

Yokohama, Japan

Hajime Takeuchi