Compact, energy-saving lamp

US6489716B1 · kind B1 · utility

Inventors

• Walter Tews · Greifswald, DE
• Gundula Roth · Levenhagen, DE
• Ina Fethke · Greifswald, DE
• Jens Klimke · Bocholt, DE

Key dates

• Filing date: Oct 14, 1999
• Grant date: Dec 3, 2002
• Expiry date: Oct 14, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J61/44
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A compact energy lamp having high luminous flux, long life and a very similar color temperature of between 2300° K and 6500° K which includes a vacuum-type discharge vessel filled with mercury and a noble gas. The inside of the discharge vessel is provided with a luminescent layer and is provided with means for maintaining discharge. The luminescent layer includes two phosphors. The first phosphor is a green-emitting gadolinium magnesium borate silicate, activated with cerium and terbium, and the second phosphor is yttrium oxide: Eu3+, which emits in the red spectral region.