Mitsubishi Chemical Corporation

Citizen Electronics Co., Ltd.

Nichia Corporation

Samsung Electronics Co., Ltd.

Masahiko Yoshino

Naoto Kijima

Takashi Hase

Byungchul Hong

Naoki Sako

Kentarou Horibe

Fumiko Yoyasu

Tetsuo Murayama

Takatoshi Seto

Kanzi Shimizu

Akiko Yabe

Takayuki Shoda

Dohoon Kim

Takamasa Izawa

Motoyuki Shigeiwa

Masayoshi Mikami

Hiroyuki Imura

To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

Light emitting device

To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100&#xb0; C. to the emission intensity at 25&#xb0; C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

Illumination device

To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 1000 C to the emission intensity at 25&#xb0; C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

Semiconductor light emitting device, backlight, color image display device and phosphor to be used for them

A yellow phosphor is provided. The yellow phosphor includes a crystal formed of a compound that is represented by the following formula (1): Ln(EuM)SiAlON(0.5&#x2266;x&#x2266;3, 0&#x3c;z&#x3c;0.3, 0&#x3c;y&#x2266;4) (1), wherein Ln includes at least one rare earth element, and M includes at least one selected from calcium (Ca), barium (Ba), strontium (Sr), and magnesium (Mg).

Phosphor and light-emitting device including the same

The present invention provides a light-emitting device having an excitation source which emits a light having a wavelength of from 420 to 500 nm and a phosphor in combination, and having a high luminance. A light-emitting device having a first illuminant which emits a light having a wavelength of 420 to 500 nm and a second illuminant which emits a visible light when irradiated with the light from the first illuminant, characterized in that the second illuminant contains a phosphor, and the object color of the phosphor satisfies L*&#x2267;90, &#x2212;22&#x2266;a*&#x2266;&#x2212;10, and b*&#x2267;55, in the L*, a*, b* color system.

Light-emitting device and phosphor

An object of the present invention is to provide a high-efficiency red light emitting phosphor and white light emitting phosphor for using in a display or lighting which high-efficiently emits light in combination with a light source which emits light in the region from near-ultraviolet light to visible light. The present invention relates to a phosphor having a crystal phase having a specified chemical composition.

Phosphor and including the same, light emitting apparatus, illuminating apparatus and image display

The present invention is to provide a light emitting device which can generate high-intensity light emission, using a fluorescent material containing a rare earth element ion complex and being excellent in durability and also provide the fluorescent material to be used therein. The present invention relates to a light emitting device comprising a semiconductor light emitting element which emits light within the region from near-ultraviolet light to visible light, and a fluorescent material which contains a rare earth element ion complex having an aromatic ring-containing Bronsted acid ion with a pKa value of 7 or less as a ligand and emits light by the action of light of the semiconductor light emitting element.

Light emitting device and fluorescent material

Growing community of inventors

Yokohama, Japan

Masahiko Yoshino