Fluorescent lamp with phosphor having coated phosphor particles

Details Fluorescent lamp with phosphor having coated phosphor particles Fluorescent lamp with phosphor having coated phosphor particles

1991-11-27

1994-02-22

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313486, H01J 6144

Patent

active

052890813

ABSTRACT:
A fluorescent lamp characterized in that the charging tendency of a phosphor used is positioned more negative side than that of metal oxides each having a metal ion electronegativity X.sub.i of 7.0 but more positive side than that of metal oxides each having a metal ion electronegativity X.sub.i of 11.8, that particles of the phosphor are charged positive and smaller than 3.0 .mu.C per gram when they are in contact with soda lime glass beads each having a particle size of 200-500 .mu.m, or that they are charged negative and larger than -0.5 .mu.C per gram when they are in contact with reduced iron powder having a particle size of 44-74 .mu.m.

REFERENCES:
patent: 4335330 (1982-06-01), Peters et al.
patent: 4423349 (1983-12-01), Nakajima et al.
patent: 4691140 (1987-09-01), Sakakibara et al.
patent: 4999219 (1991-03-01), Klinedinst et al.

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