Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1992-08-28
2000-10-24
Wu, Xiao
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313467, H01J 162
Patent
active
06137217&
ABSTRACT:
A fluorescent lamp comprises at least one layer of a four-component phosphor blend for producing visible illumination having a white color. The quad-phosphor blend comprising a first and second red-emitting phosphor component with each red-emitting phosphor component having different visible emission spectrum principally in the 590 to 630 nm wavelength range. A third blue-emitting phosphor component has an emission spectrum principally in the 430 to 490 nm wavelength range. A fourth no-rare-earth green-emitting phosphor component has an emission spectrum principally in the 500 to 570 nm wavelength range. 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 only three of the phosphor components.
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IES Lighting Handbook, Reference Volume, Fifth Edition 1972, Illuminating Engineering Society, p. 2-9.
Hunt, Jr. Roger B.
Pappalardo Romano G.
Clark Robert F.
GTE Products Corporation
Wu Xiao
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