Protection film for improved phosphor maintenance and increased

Details Protection film for improved phosphor maintenance and increased Protection film for improved phosphor maintenance and increased

1984-11-13

1986-08-19

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313486, H01J 6135

Patent

active

046071911

ABSTRACT:
In a fluorescent lamp having a phosphor coating, a maintenance improving and light output increasing film comprising yttrium oxide and at least one U.V. absorber is applied over the phosphor. The U.V. absorber is effective in the absorption of a greater amount of 185 nm radiation than 254 nm radiation from the plasma discharge. The film is most beneficial when applied over alkaline earth halophosphate phosphors at a film thickness of from about 50 angstroms to about 500 angstroms.

REFERENCES:
patent: 3430089 (1969-02-01), Sarver et al.
patent: 4459507 (1984-07-01), Flaherty

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