Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1992-08-28
1998-02-03
Nguyen, Chanh
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313486, H01J 162
Patent
active
057148368
ABSTRACT:
A fluorescent lamp comprises at least one layer of a quad-phosphor blend for emitting visible illumination having a white color. The quad-phosphor blend comprising a first and second green emitting phosphor component with each green emitting phosphor component having different visible emission spectrum principally in the 520 to 560 nm wavelength range. A third blue emitting phosphor component has an emission spectrum principally in the 440 to 470 nm wavelength range. A fourth red emitting phosphor component has an emission spectrum principally in the 590 to 620 nm wavelength range. The first green emitting phosphor component is a alkaline earth metal activated phosphor and the second green emitting phosphor is a rare earth activated phosphor wherein the relative proportions of the phosphor components are such that an enhanced color rendering index is produced as compared to tri-component blends formed from three of the phosphor components.
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Hope Lawrence L.
Hunt Roger B.
Roche William J.
Clark Robert F.
GTE Products Corporation
Nguyen Chanh
Walter Robert E.
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