Light emitting device having phosphor of alkaline earth metal silicate

US6943380B2 · kind B2 · utility

Assignees

• TOYODA GOSEI CO., LTD. · JP
• TRIDONIC OPTOELECTRONICS GMBH · AT
• Litec GBR · DE
• LEUCHTSTOFFWERK BREITUNGEN GMBH · DE

Inventors

• Koichi Ota · Chuo, JP
• Atsuo Hirano · Miyoshi, JP
• Akihito Ota · Kita Nagoya, JP
• Stefan Tasch · Fehring, AT
• Peter Pachler · Graz, AT
• Gundula Roth · Levenhagen, DE
• Walter Tews · Greifswald, DE
• Wolfgang Kempfert · Bad Liebenstein, DE
• Detlef Starick · Berlin, DE

Key dates

• Filing date: Dec 28, 2001
• Grant date: Sep 13, 2005
• Expiry date: Dec 28, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

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.