Toyoda Gosei Co., Ltd.

Tridonic Optoelectronics Gmbh

Litec Gbr

Leuchstoffwerk Breitungen Gmbh

Akihito Ota

Koichi Ota

Walter Tews

Gundula Roth

Detlef Starick

Peter Pachler

Stefan Tasch

Atsuo Hirano

Wolfgang Kempfert

Yuji Takahashi

Koichi Kaga

Yoshinobu Suehiro

Satoshi Wada

Tadashi Endo

A light-emitting device with an emission wavelength range of from 360 nm to 550 nm and a fluorescent material made of Ca&#x2014;Al&#x2014;Si&#x2014;O&#x2014;N oxynitride activated with Euare used so that a part of light emitted from the light-emitting device is emitted while the wavelength of the part of light is converted by the fluorescent material.

Light-emitting unit having specific fluorescent material

The light emitting device has a light emitting diode which is made of a nitride semiconductor and a phosphor which absorbs a part of lights emitted from the light emitting diode and emits different lights with wavelengths other than those of the absorbed lights. The phosphor is made of alkaline earth metal silicate fluorescent material activated with europium.

Light emitting device

A reflection-type light emitting apparatus has an excellent heat radiation property and allows the use of a high-power light emitting element, the minimization of a reduction in radiation efficiency of reflected light, and the focused radiation of high-output light at high efficiency. The apparatus has: a caseof metallic material and with an excellent heat radiation property; a reflection mirror sectionformed fitted to the lower portion of case; a transparent plateto cover the upper surface of case; heat radiation platesof metallic material with excellent heat conductivity and inserted inside the case; an LED elementmounted on the heat radiation plate; lead sectionsA,B fixed through an insulating layerto the heat radiation plateto serve as a power supply member to supply power to the LED element; and a spacerof an insulating material to insulate the lead sectionsA,B from the case

Light emitting apparatus

Light emitting device having a divalent-europium-activated alkaline earth metal orthosilicate phosphor

Light emitting device having phosphor of alkaline earth metal silicate

A light-emitting device with an emission wavelength range of from 360 nm to 550 nm and a fluorescent material made of Ca&mdash;Al&mdash;Si&mdash;O&mdash;N oxynitride activated with Eu are used so that a part of light emitted from the light-emitting device is emitted while the wavelength of the part of light is converted by the fluorescent material.

Light-emitting unit

Growing community of inventors

Aichi-ken, Japan

Akihito Ota