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 11/02 (2006.01) H01J 61/46 (2006.01)

Patent

CA 2105021

A fluorescent lamp comprises at least one layer of a quad-phosphor blend for emitlang 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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