Mitsubishi Chemical Corporation

Citizen Electronics Co., Ltd.

Nichia Corporation

University of California

Byungchul Hong

Naoto Kijima

Takashi Hase

Masahiko Yoshino

Kentarou Horibe

Naoki Sako

Fumiko Yoyasu

Yoshihito Satou

Jeffrey A Gerbec

Ram Seshadri

Hiroaki Sakuta

Ayuko Onozuka

Atsushi Oishi

Alexander Birkel

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

An object of the present invention is to provide an infrared light-emitting phosphor which emits light in a wavelength range where the sensitivity of a detector is high by combination with a semiconductor light-emitting element that emits light in the visible light region, and to provide an infrared light-emitting device using the infrared light-emitting phosphor. The object can be achieved with a light-emitting device including a semiconductor light-emitting element that emits ultraviolet light or visible light and a phosphor that absorbs ultraviolet light or visible light emitted from the semiconductor light-emitting element and emits light in the infrared region, wherein an emission peak wavelength in the infrared region of the phosphor emitting in the infrared region is from 750 to 1,050 nm, and the half width of an emission peak waveform is more than 50 nm.

Light emitting device and phosphor

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

The present invention addresses providing a novel narrowband red phosphor having a high internal quantum efficiency, a short afterglow time, and a large number of emission components in a short-wavelength region with high red visibility. This is solved by a phosphor characterized by including a crystalline phase that has a predetermined composition and having a specific peak in a powder X-ray diffraction pattern.

Phosphor, light-emitting device, illumination device and image display device

The phosphor of the present invention comprises a crystal phase having a chemical composition represented by the following formula [2], the crystal phase having no garnet structure, and the phosphor having an emission peak in a wavelength range of 600 nm to 650 nm by being activated by at least Mn,ABCDX&#x2003;&#x2003;formula [2].

Phosphor, phosphor-containing composition and light-emitting unit using phosphor, and image display device and lighting device using light-emitting unit

A composition of matter including a phosphor having an emission peak in each of a blue, green, and red color region of the Electromagnetic spectrum, wherein the phosphor is excitable by light having a wavelength between 350 nanometers (nm) and 420 nm.

Single phase and full-color phosphor

Provided is a phosphor having enhanced luminance with respect to that of conventional &#x3b2;-type sialon phosphors. A phosphor having enhanced luminance is obtained by causing Al, O (oxygen) and Eu to be present at specific concentrations in a produced &#x3b2;-type sialon phosphor. Specifically, provided is a &#x3b2;-type sialon phosphor containing Si, Al, O, N and Eu, wherein the Al concentration in the phosphor ranges from 0.80 mass % or higher to 2.25 mass % or lower, the O concentration ranges from 0.36 mass % or higher to 1.15 mass % or lower, the Eu concentration ranges from 0.40 mass % or higher to 0.80 mass % or lower and a ratio (Al/O) of the Al concentration with respect to the O concentration ranges from 2.0 or higher to 3.0 or lower.

Phosphor and light-emitting device using same

The present invention provides a technology that allows reducing the used amount of a Mn-activated fluoride complex phosphor without loss of luminous efficiency, in a white light-emitting device that is provided with the Mn-activated fluoride complex phosphor and an LED element that is an excitation source of the phosphor. The present invention provides a white light-emitting device comprises a blue LED element, as well as a yellow phosphor and/or a green phosphor and a red phosphor as phosphors that are excited by the blue LED element. The red phosphor contains a Mn-activated fluoride complex phosphor and a Eu-activated alkaline earth silicon nitride phosphor.

Growing community of inventors

Yokohama, Japan

Byungchul Hong