Electrode material for fluorescent lamps

US6384534B1 · kind B1 · utility

Assignee

• General Electric Company · US

Inventors

• Alok Mani Srivastava · San Francisco, US
• Holly Ann Comanzo · Niskayuna, US
• Laurence Bigio · University Heights, US
• William Winder Beers · Chesterland, US
• Thomas F. Soules · Cleveland Heights, US
• Emoke Abasari · Budapest, HU

Key dates

• Filing date: Dec 17, 1999
• Grant date: May 7, 2002
• Expiry date: Dec 17, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2002/54
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is provided an emissive mixture for cathodes of fluorescent lamps comprising a ceramic material having a formula (A1-x Cax)6 (Ta1-y Wy)2 O11+y, where A is barium or a combination of barium and strontium, 0&lE;x<0.5, 0&lE;y<1, and one of x or y is greater than zero. The ratio of lamp efficacy to number of lamp starts may be improved by optimizing the amount of Ca and W present in the ceramic material.