Fluorescent lamp with improved CRI and brightness
First Claim
1. A fluorescent lamp comprising a glass envelope having electrodes at its ends, a mercury and inert gas filling within said envelope which produces ultraviolet radiation, a coating on the interior surface of the glass envelope comprising a blend of alkaline earth metal halophosphate phosphors and a quad-phosphor blend for converting a substantial portion of said ultraviolet radiation to visible illumination having a white color wherein the combination of phosphors result in a predetermined color point from about 2700 to about 4200K on or near the Planckian locus, said quad-phosphor blend comprising a red color emitting phosphor component having a visible emission spectrum principally in the 590 to 630 nm wavelength range, blue color emitting phosphor component having an emission spectrum principally in the 430 to 490 nm wavelength range, and a green color emitting phosphor component having an emission spectrum principally in the 500 to 570 nm wavelength range, said quad-phosphor blend additionally includes an europium activated aluminate green emitting phosphor component wherein both the quad-blend and said blend of alkaline earth metal halophosphate phosphors substantially match the desired predetermined color point.
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Abstract
A fluorescent lamp has a coating on the interior surface of the glass envelope comprising an alkaline earth metal halophosphate phosphor and a quad-phosphor blend wherein the combination of phosphors result in a predetermined color point from about 2700 to about 4200 K on or near the Planckian locus where the alkaline earth metal halophosphate phosphor comprises a blend of halophosphate phosphors having a color temperature substantially matching the color temperature of the quad-blend which includes an europium activated aluminate as a phosphor component.
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Citations
20 Claims
- 1. A fluorescent lamp comprising a glass envelope having electrodes at its ends, a mercury and inert gas filling within said envelope which produces ultraviolet radiation, a coating on the interior surface of the glass envelope comprising a blend of alkaline earth metal halophosphate phosphors and a quad-phosphor blend for converting a substantial portion of said ultraviolet radiation to visible illumination having a white color wherein the combination of phosphors result in a predetermined color point from about 2700 to about 4200K on or near the Planckian locus, said quad-phosphor blend comprising a red color emitting phosphor component having a visible emission spectrum principally in the 590 to 630 nm wavelength range, blue color emitting phosphor component having an emission spectrum principally in the 430 to 490 nm wavelength range, and a green color emitting phosphor component having an emission spectrum principally in the 500 to 570 nm wavelength range, said quad-phosphor blend additionally includes an europium activated aluminate green emitting phosphor component wherein both the quad-blend and said blend of alkaline earth metal halophosphate phosphors substantially match the desired predetermined color point.
Specification