Fluorescent lamp with improved phosphor blend

Details Fluorescent lamp with improved phosphor blend Fluorescent lamp with improved phosphor blend

H - Electricity

01

J

H01J 61/44 (2006.01) C09K 11/66 (2006.01) C09K 11/77 (2006.01) H01J 61/48 (2006.01)

Patent

CA 2105023

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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