Rare earth phosphor blends for fluorescent lamp using four to fi

Details Rare earth phosphor blends for fluorescent lamp using four to fi Rare earth phosphor blends for fluorescent lamp using four to fi

1989-11-28

1992-06-16

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313485, H01J 162, H01J 6304

Patent

active

051227100

ABSTRACT:
A phosphor blend for a fluorescent lamp having four rare earth phosphors, each of which emits a narrow band of visible light energy in the visible spectrum. The color of the light produced by three of the phosphors is red, blue and green. The fourth phosphor producing light in the blue-green range improves the color rendering index of the visible light output without seriously afflecting the lumen output as compared to a blend in which only the red-blue-green phosphors are used. A fifth rare earth narrow band phosphor capable of producing energy in the ultraviolet A range can be added to the blend when it is desired to simulate various phases of natural daylight. The band of ultraviolet range energy produced can be smoothed by adding to the blend another phosphor capable of producing energy in the Ultraviolet A range.

REFERENCES:
patent: 3670193 (1972-06-01), Thorington et al.
patent: 4199707 (1980-04-01), Akiyama et al.
patent: 4296353 (1981-10-01), Walter
patent: 4683379 (1987-07-01), Wolff
patent: 4891550 (1990-01-01), Northrop et al.
patent: 4924141 (1990-05-01), Taubner et al.

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