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

1992-02-11

Cannon, James C.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

313486, 313487, 313489, B32B 3300, C09K 1170

Patent

active

050875230

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: 4585673 (1968-04-01), 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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