Phosphors with improved lumen output and lamps made therefrom

Details Phosphors with improved lumen output and lamps made therefrom Phosphors with improved lumen output and lamps made therefrom

1991-03-11

1992-05-12

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313485, 313487, 313489, H01J 162, H01J 6304

Patent

active

051131188

ABSTRACT:
A phosphor having a continuous protective bi-layer coating of alumina surrounding silica surrounding the phosphor particles is disclosed. The method of making a bi-layer coating on phosphor particles is also disclosed. The first layer surrounding the phosphor is silica. The second layer surrounding the phosphor is alumina. The bi-layer phosphor is useful in fluorescent lamps providing improved maintenance and brightness. The bi-layer phosphor can also be used in high color rendition lamps employing blends of phosphors.

REFERENCES:
patent: 3408223 (1968-10-01), Shortes
patent: 4363998 (1982-12-01), Graff et al.
patent: 4585673 (1986-04-01), Sigai
patent: 4691140 (1987-09-01), Sakakibara
patent: 4710674 (1987-12-01), Sigai
patent: 4803400 (1989-02-01), Peters et al.
patent: 4877651 (1989-10-01), Dory

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