Mitsubishi Chemical Corporation

Citizen Electronics Co., Ltd.

Nichia Corporation

Kentarou Horibe

Naoto Kijima

Takashi Hase

Byungchul Hong

Masahiko Yoshino

Naoki Sako

Yuhei Inata

Fumiko Yoyasu

Naoyuki Komuro

Yukihiro Miyamoto

Tadahiro Katsumoto

Harumi Asami

Takashi Harada

Minoru Soma

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

A sintered phosphor-composite having a high internal quantum efficiency and a high transmittance is provided. The object can be achieved with a sintered phosphor-composite including a nitride phosphor and a fluoride inorganic binder, wherein, in cross-sectional observation, the sintered phosphor-composite includes at least a portion in which voids of not more than 1 &#x3bc;m are present in a number of not more than 700 within a cross-sectional area of 0.046 mm, or a portion having a void area fraction of not more than 3% within a cross-sectional area of 0.046 mm.

Sintered phosphor-composite, light-emitting device, lighting device and vehicle indicator lamp

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

Provided is a sintered phosphor-composite for an LED, having high heat resistance, high thermal conductivity, high luminance, and high conversion efficacy. In addition, there are provided: a light-emitting apparatus which uses the sintered phosphor-composite; and an illumination apparatus and a vehicular headlamp which use the light-emitting apparatus. The sintered phosphor-composite includes a nitride phosphor and a fluoride inorganic binder. The sintered phosphor-composite preferably has an internal quantum efficiency of 60% or more when excited by blue light having a wavelength of 450 nm. Further, the sintered phosphor-composite preferably has a transmittance of 20% or more at a wavelength of 700 nm.

Sintered phosphor, light emitting device, illumination device, vehicle headlamp, and method for manufacturing sintered phosphor

Growing community of inventors

Ushiku, Japan

Kentarou Horibe